Control Systems Question & AnswersJune 5, 2021 By WatElectronics This article lists 100+ Control Systems MCQs for engineering students. All the Control Systems Questions & Answers given below includes solution and link wherever possible to the relevant topic.The connection of components together to perform a specific operation in which the output is controlled by input is known as a control system. The control systems are of two types open loop and close loop control systems. In an open-loop system, we just give input to a system and it provides the output according to the characteristics of the system. The open-loop systems are simple, economical, stable, and the changes in the output are not corrected automatically in an open-loop control system. The closed-loop control system is nothing but an open-loop system with a feedback element. The close loop systems are more accurate and less affected by noise. 1). How many types of control systems are there?OneTwoThreeFourHint There are two types of control systems are there they are open loop and close loop control systems 2). The advantages of an open-loop systems are __________Simple, EconomicalEasier to constructStableAll of the aboveHintThe open-loop control systems are very easy to construct, simple, economical, and stable 3). What are the disadvantages of a closed-loop control system?Complex, costlierStability is the main problemFeedback reduces the overall gain of the systemAll of the aboveHintCompare to the open-loop system, the closed-loop systems are more complex, costlier to integrate, and feedback reduces the overall gain of the system and the major problem is stability 4). Whenever the control system obeys the linearity and homogeneity then the system is ____________Time invariant systemLinear systemLinear time-variant systemLinear time-invariant systemHintWhenever the control system obeys the linearity and homogeneity then the system is linear 5). What are the advantages of a closed-loop control system?AccurateLess effected by noiseMore effected by noiseBoth a and bHintThe close loop control systems are accurate and less affected by noise 6). Whenever the control system doesn’t obey the linearity and homogeneity then the system is ____________Time-invariant systemLinear systemNon-linear systemLinear time-invariant systemHint Whenever the control system doesn’t obey the linearity and homogeneity then the system is non-linear 7). If output is varying with time then the system is ____________Time invariant systemLinear systemNon-linear systemTime variant systemHintIf the output is varying with time then the system is time-variant 8). What are the disadvantages of an open-loop control system?InaccurateAccurateEasy to constructNone of the aboveHintOpen-loop systems are inaccurate 9). If output is not varying with time then the system is ____________Time invariant systemLinear systemNon-linear systemTime variant systemHintIf the output is not varying with time then the system is time-invariant 10). If the control system is both linear and time-variant then the type of system is ____________Time-invariant systemLinear systemLinear time-variant systemLinear time-invariant systemHint If the control system is both linear and time-variant then the type of system is a linear time-variant system 11). If the control system is both linear and time-invariant then the type of system is ____________Time-invariant systemLinear systemLinear time-variant systemLinear time-invariant systemHintIf the control system is both linear and time-invariant then the type of system is a linear time-invariant system 12). How many types of feedbacks are there?OneTwoThreeFourHintThere are two types of feedbacks are there they are positive and negative feedback 13). The transfer function of negative feedback is expressed as ________T= G/1+GHT= G/1-GHT= G/1*GHT= G/GH-1HintThe transfer function of negative feedback is expressed as T= G/1+GH 14). The transfer function of positive feedback is expressed as ________T= G/1+GHT= G/1-GHT= G/1*GHT= G/GH-1HintThe transfer function of positive feedback is expressed as T= G/1-GH 15). The transfer function is defined as a ratio of ______________Laplace transform of output to Laplace transform of the inputLaplace transform of output + Laplace transform of the inputLaplace transform of output - Laplace transform of the inputNone of the aboveHintThe transfer function is defined as a ratio of Laplace transform of output to Laplace transform of the input 16). The sensitivity is defined as a ___________Percentage change in transfer function to the percentage change in gainPercentage change in gain to the percentage change in a transfer functionPercentage change in transfer function*the percentage change in gainNone of the aboveHintThe sensitivity is defined as a ratio of percentage change in transfer function to the percentage change in gain 17). How many types of mechanical systems are there based on the type of motion?OneTwoThreeFourHintThere are two types of mechanical systems are there based on the type of motion they are translational and rotational mechanical system 18). What are the basic elements in the translational mechanical system?Mass, springMass, dashpotDashpot, springMass, spring, and dashpotHintThe mass, spring, and dashpot are the basic elements in the translational mechanical system 19). _________ mechanical systems move along a lineTranslationalRotationalBoth a and bNone of the aboveHintThe translational mechanical systems move along a line 20). What are the basic elements in the rotational mechanical system?Translational springMoment of the interior of massDashpotAll of the aboveHintThe translational spring, dashpot, moment of the interior of the mass are the basic elements in a rotational mechanical systemControl System MCQs for Engineers 21). How many analyses do we have to convert any mechanical translational system into an electrical system?OneTwoThreeFourHintThere are two analysis to convert any mechanical translational system into an electrical system they are force voltage and force current analysis 22). In force voltage analogy the mechanical system input is always considered as _______ForceVelocityVoltageNone of the aboveHintIn force voltage analogy the mechanical system input is always considered as force 23). In force voltage analogy the mechanical system output is in terms of _______ForceVelocityVoltageNone of the aboveHintIn force voltage analogy the mechanical system output is in terms of velocity 24). _________ mechanical systems will move along an axisTranslationalRotationalBoth a and bNone of the aboveHintThe rotational mechanical systems will move along an axis 25). For electrical system in force voltage analogy the input is always considered as _____________ForceVelocityVoltage sourceNone of the aboveHintFor an electrical system in force voltage analogy the input is always considered as a voltage source 26). In force voltage analogy the electrical system output is in terms of ______Force b) c) d)VelocityVoltage sourceCurrent through the elementHintIn force voltage analogy the electrical system output is in terms of current through the element 27). In force current analogy the electrical system output is in terms of ______ForceVelocityVoltage through the elementCurrent through the elementHintIn force current analogy the electrical system output is in terms of voltage through the element 28). In torque voltage analogy the mechanical rotational system input is always considered as ____________ForceVelocityAngular velocityTorqueHintIn torque voltage analogy the mechanical rotational system input is always considered as torque 29). Torque equation for mass is expressed as _________T=J dω/dtT=BωT=K ∫ωdtNone of the aboveHintThe torque equation for mass is expressed as T=J dω/dt 30). ___________ is a point representing a variable or signalNodeTransmittanceBranchNone of the aboveHintNode is a point representing a variable or signal 31). In force current analogy the electrical system input is always considered as __________Current sourceVelocityVoltageNone of the aboveHint In force current analogy the electrical system input is always considered as current 32). ______ is a node that contains only outgoing branchesInput nodeOutput nodeMixed nodeNone of the aboveHintThe input node is a node that contains only outgoing branches 33). How many types of time-domain analyses are there?OneTwoThreeFourHintThere are two types of time-domain analysis are there they are transient response and steady-state response 34). The response of the system which varies with time is known as ________Transient responseSteady-state responseBoth a and bNone of the aboveHintThe response of the system which varies with time is known as transient response 35). In torque voltage analogy the mechanical rotational system output is in terms of ____________ForceVelocityAngular velocityTorqueHint In torque voltage analogy the mechanical rotational system output is in terms of angular velocity 36). Torque equation for dashpot is expressed as ________T=J dω/dtT=BωT=K ∫ωdtNone of the aboveHintThe torque equation for dashpot is expressed as T=Bω 37). _____ is a node that has both outgoing and incoming branchesInput nodeOutput nodeMixed nodeNone of the aboveHintThe mixed node is a node that has both outgoing and incoming branches 38). In torque voltage analogy the electrical system is always considered as _________VoltageVelocityAngular velocityTorqueHintIn torque voltage analogy the electrical system is always considered as voltage 39). Torque equation for spring is expressed as ________T=J dω/dtT=BωT=K ∫ωdtNone of the aboveHintThe torque equation for spring is expressed as T=K ∫ωdt 40). ________ is a node that contains only incoming branchesInput nodeOutput nodeMixed nodeNone of the aboveHintThe output node is a node that contains only incoming branchesControl System MCQs for Quiz 41). In torque voltage analogy the electrical system output is in terms of ____________ForceVelocityAngular velocityCurrent through the elementHintIn torque voltage analogy the electrical system output is in terms of current through the element 42). The response of a system that won’t change with time is known as__________Transient responseSteady-state responseBoth a and bNone of the aboveHint The response of a system that won’t change with time is known as steady-state response 43). What are the characteristics of the test signal?Sudden shockSudden changeConstant velocity and accelerationAll of the aboveHintThe sudden shock, sudden change, constant velocity, and acceleration are the characteristics of the test signal 44). _____________are the time domain specificationsDelay time, rise timePeak timeSettling timeAll of the aboveHintThe delay time, rise time, peak time, and settling time are the time domain specifications 45). The time taken for the response to reach 50% of its final value from the very first time is known as _________Delay timePeak timeSettling timeAll of the aboveHintThe time taken for the response to reach 50% of its final value from the very first time is known as delay time 46). The time taken for the response to reach 0-100% of its final value from the very first time is known as _________Rise timePeak timeSettling timeAll of the aboveHintThe time taken for the response to reach 0-100% of its final value from the very first time is known as rise time 47). How many types of static error constants are there?OneTwoThreeFourHintThere are three types of static error constants are there they are positional, velocity, acceleration error constants 48). The lag-lead compensator produces __________Phase lagPhase ledBoth a and bNone of the aboveHintThe lag-lead compensator produces both phase lag and phase lead 49). What are the effects of lag compensator?Stability increasesRise time increasesBandwidth decreasesAll of the aboveHintThe effects of lag compensator are stability and rise time increases and bandwidth decreases 50). Compensators are used to __________Obtain the desired performance of the systemUsed to stabilize the unstable systemBoth a and bNone of the aboveHint Compensators are used to obtain the desired performance of the system and to stabilize the unstable system 51). The time taken for the response to reach the peak value is called as ________Rise timePeak timeSettling timeAll of the aboveHintThe time taken for the response to reach the peak value is called peak time 52). What are the effects of lead compensator?Stability increasesRise time decreasesBandwidth increasesAll of the aboveHintThe effects of lead compensator are stability and bandwidth increases, and rise time decreases 53). How many types of compensators are there based on connections?OneTwoThreeFourHint There are three types of compensators are there based on connections they are cascade, feedback, and cascade with feedback compensator 54). How many system analysis methods are there?OneTwoThreeFourHintThe system analysis methods are two types they are state space and transfer function based method 55). _________ is a method which works based on transfer functionPolar plotNyquist rateRoot LocusAll of the aboveHintThe polar plot, Nyquist rate, root locus are the methods works based on the transfer function 56). The transfer-based method is applicable to ____________ systemTime variantNon-linearLTINone of the aboveHintThe transfer-based method is applicable to the LTI system 57). The state-space method is applicable to _________Time variantNon-linearBoth a and bNone of the aboveHintThe state-space method is applicable to both time-variant and non-linear systems 58). How many types of compensators are there?OneTwoThreeFourHintThe compensators are of four types they are lead, lag, lag-lead, and lead-lag compensators 59). The dynamic systems are classified into ____________OneTwoThreeFourHint The dynamic systems are classified into four types they are SISO Vs MIMO, linear Vs non-linear, time-invariant Vs time-varying, and causal Vs non-causal system 60). In which system the output at any instant of time depends only on past and current inputs?CausalNon-causalTime-invariantNone of the aboveHintIn a causal system, the output at any instant of time depends only on past and current inputs 61). __________ controller produces an output which is derivative of error signalIntegral controllerDerivative controllerProportional derivative controllerNone of the aboveHint The derivative controller produces an output that is derivative of an error signalControl System MCQs with Hints 62). __________ controller produces an output which is integral of error signalIntegral controllerDerivative controllerProportional derivative controllerNone of the aboveHintThe integral controller produces an output that is integral of an error signal 63). __________ controller produces an output which is in the combination of the outputs of the proportional and derivative controllerIntegral controllerDerivative controllerProportional derivative controllerNone of the aboveHintThe proportional derivative controller produces an output which is in the combination of the outputs of the The proportional and derivative controller 64). ___________ are used to determine the magnitude of CLTF using OLTFM circlesN circlesBoth a and bNone of the aboveHintM circles are used to determine the magnitude of CLTF using OLTF, it is applicable only for unity feedback systems 65). ___________ are used to determine the response of a closed-loop system using open-loop transfer functionM circlesN circlesBoth a and bNone of the aboveHintN circles are used to determine the response of a closed-loop system using the open-loop transfer function 66). For non-minimum phase system the poles are _________Left sideRight sideEither left or right sideNone of the aboveHintFor non-minimum phase system, the poles are either left or right side 67). How many plots do the bode plot consist of?OneTwoThreeFourHintThe bode plot consists of two plots they are magnitude and phase plot 68). In which frequency the maximum magnitude occurs?Resonant frequencyNatural frequencyBoth a and bNone of the aboveHintIn resonant frequency, the maximum magnitude occurs 69). __________ is the frequency response techniqueBode plotPolar plotNyquist plotAll of the aboveHint The bode plot, polar plot, Nyquist plot, Nicholas chart are the frequency response techniques 70). The systems are categorized into _____________ types based on stabilityOneTwoThreeFourHintThe systems are categorized into three types based on stability they are absolutely stable, unstable, and conditionally stable system 71). ____________ technique is used to calculate the stabilityRoot locus, bode plotNyquist plot, Nicholas chartRouth Hurwitz criterionAll of the aboveHintThe root locus, bode plot, Nyquist plot, Nicholas chart, Routh Hurwitz criterion are the techniques used to calculate the stability 72). When a control system is exited with a standard input signal then the steady-state error is __________ZeroConstantInfiniteZero or one or infiniteHintWhen a control system is exited with a standard input signal then the steady-state error may be zero or one or infinite 73). The state error constants are categorized into _________OneTwoThreeFourHintThe state error constants are categorized into three types they are positional, velocity, acceleration error constants 74). _____________ are the examples of systemAircraftsAutomobileHelicoptersAll of the aboveHintAircraft, Automobile, Helicopters, etc are examples of system 75). The control systems are used in electrical systems to control _____________ in electrical systemVoltageCurrentBoth a and bNone of the aboveHintThe control systems are used in electrical systems to control both voltage and current in an electrical system 76). The example of an open-loop control system is _________Electric ironElectric fanWater tankAll of the aboveHintThe electric iron, electric fan, water tank are examples of an open-loop control system 77). The example of an closed-loop control system is _________Voltage stabilizersAutomatic electronic ironWater tanks with float ballAll of the aboveHint The Voltage stabilizers, Automatic electronic iron, Water tanks with float ball are examples of the closed-loop control system 78). What are the examples of control systems?Air conditionersRefrigeratorsPower systemAll of the aboveHintAir conditioners, refrigerators, power system are examples of control systems 79). ___________ is used to allow a signal to be used by two or more blocks or summing pointsBranchesTakeoff pointSumming pointNone of the aboveHintTakeoff point is used to allow a signal to be used by two or more blocks or summing points 80). _________ used for summation of two or more input signalsBranchesTakeoff pointSumming pointNone of the aboveHintSumming point used for summation of two or more input signalsControl System MCQs for Exams 81). How many outputs does the summing point have?OneTwoThreeFourHintThe summing point has only one output and is equal to the algebraic sum of the input 82). Which element indicated the direction of flow of signals in a system?BranchesTakeoff pointSumming pointArrowsHintArrows indicate the direction of flow of signals in a system 83). The force due to spring is expressed as __________-KxKx–B dx/dtNone of the aboveHintThe force due to spring is expressed as -Kx 84). The force due to damper is expressed as __________-KxKx–B dx/dtNone of the aboveHintThe force due to the damper is expressed as –B dx/dt 85). __________ are the basic elements of an electrical systemCapacitorResistorInductorAll of the aboveHintThe resistors, capacitors, inductors are the basic elements of an electrical system 86). _____________ is defined as the flux linkage per unit currentInductanceCapacitorTransistorResistorHintInductance is defined as the flux linkage per unit current 87). _________ is defined as a ratio of the charge to the voltage across the capacitor terminalsInductanceCapacitorTransistorResistorHintThe capacitor is defined as a ratio of the charge to the voltage across the capacitor terminals 88). The potentiometers are categorized into _________OneTwoThreeFourHintThe potentiometers are categorized into two types they are translational and rotational potentiometers 89). The stepper motor is a __________ deviceElectro-mechanical digitalElectro-chemical digitalElectro-mechanical analogNone of the aboveHintThe stepper motor is an electro-mechanical digital device 90). The step size of the stepper motor is typically between ___________1.5 to 20 deg1.5 to 30 deg1.5 to 60 deg1.5 to 40 degHintThe step size of the stepper motor is typically between 1.5 to 30 deg 91). How many types of stepper motors are there?OneTwoThreeFourHintThere are three types of stepper motors are there they are variable reluctance, permanent magnet & permanent magnet hybrid stepper motors 92). How many stator poles does a permanent magnet stepper motor have?OneTwoThreeFourHint The permanent magnet stepper motor has four stator poles 93). How many rotor poles does a permanent magnet stepper motor have?OneTwoThreesixHintThe permanent magnet stepper motor has six rotor poles Read more about Stator Read more about Stepper Motor 94). The full step angle of permanent magnet stepper motor is around _________20 deg30 deg40deg50 degHintThe full step angle of the permanent magnet stepper motor is around 30 deg 95). _________ are the applications of stepper motorAutomatic control systemsUsed in computer peripheral systemsIn paper drive mechanismsAll of the aboveHint The stepper motors are used in computer peripheral systems, in paper drive mechanisms, and automatic control systems 96). How many types of tacho generators are there?OneTwoThreesixHintThere are two types of tacho generators are there they are AC and DC tacho generators Read more about Generators 97). Tacho generator works on the principle of ___________generatorShuntSeriesInductionNone of the aboveHintTacho generator works on the principle of induction generator 98). The techo generator comprises of ___________One stator winding, rotorTwo stator windings, rotorThree stator windings, rotorNone of the aboveHintThe tacho generator comprises of one stator winding and rotor 99). How many types of servometers are there?OneTwoThreesixHintThere are two types of servometers are there they are DC and AC servometers 100). Which servomotor is a DC servo meter?Armature controlledField controlledBoth a and bNone of the aboveHintBoth armature and field controlled servomotors are DC servo meters 101). Error detector is available in _________ systemsOpen-loopClosed-loopBoth a and bNone of the aboveHintError detector is available in closed-loop systems 102). The feedback is available in ___________ control systemOpen-loopClosed-loopBoth a and bNone of the aboveHintThe feedback is available in a closed-loop control system 103). In which control system the sensitivity is less?Open-loopClosed-loopBoth a and bNone of the aboveHintIn a closed-loop control system, the sensitivity is less 104). Which one is an example of servomechanism?Missile launcherSpeed governorFrequency regulatorNone of the aboveHintThe missile launcher is an example of servomechanism 105). Which one is an example for the regulator?Machine tool position controlRoll stabilization in shipsMissile launcherNone of the aboveHintTeam regulator, speed governor, frequency regulator, etc are examples of regulating system 106). How many types of hydraulic output devices are there?OneTwoThreeFourHintThere are two types of hydraulic output devices are there they are hydraulic motors and hydraulic linear actuator 107). The transfer function of an integrator is expressed as _______T=1/ST=1/S+1T=1/S-1T=1/S+aHintThe transfer function of an integrator is expressed as T=1/S 108). The transfer function of an differentiator is expressed as _______T=ST=1/S+1T=1/S-1T=1/S+aHintThe transfer function of the differentiator is expressed as T=S 109). The transfer function of a first-order system is expressed as _______T=ST=1/S+1T=1/S-1T=1/S+aHintThe transfer function of a first-order system is expressed as T=1/S+a 110). ________ is an example for state variableCurrent flowing through the inductorVoltage across a capacitorBoth a and bNone of the aboveHintThe current flowing through inductor and voltage across capacitor are examples for the state variable 111). Based on the gain and phase margins the control system is stable when _________Gain margin<1, the phase margin is positiveGain margin>1, the phase margin is positiveGain margin<1, the phase margin is NegativeNone of the aboveHintBased on the gain and phase margins the control system is stable when gain margin>1 and phase margin is positive 112). Based on the gain and phase margins the control system is marginally stable when _________Gain margin<1, the phase margin is positiveGain margin>1, the phase margin is positiveGain margin=1, the phase margin is zero degreesNone of the aboveHintBased on the gain and phase margins the control system is marginally stable when gain margin=1 and phase margin is zero degrees 113). Based on the gain and phase margins the control system is unstable when _________Gain margin<1, the phase margin is negativeGain margin>1, the phase margin is positiveGain margin=1, the phase margin is zero degreesNone of the aboveHintBased on the gain and phase margins the control system is unstable when gain margin<1 and phase margin is negative 114). Based on the phase and gain cross over frequencies the control system is stable when __________Phase cross over frequency>gain cross over frequencyPhase cross over frequencyPhase cross over frequency=gain cross over frequencyNone of the aboveHintBased on the phase and gain cross over frequencies the control system is stable when phase cross over frequency>gain cross over frequency 115). Based on the phase and gain cross over frequencies the control system is marginally stable when __________Phase cross over frequency>gain cross over frequencyPhase cross over frequencyPhase cross over frequency=gain cross over frequencyNone of the aboveHintBased on the phase and gain cross over frequencies the control system is marginally stable when phase cross over frequency=gain cross over frequency 116). Based on the phase and gain cross over frequencies the control system is unstable when __________Phase cross over frequency>gain cross over frequencyPhase cross over frequencyPhase cross over frequency=gain cross over frequencyNone of the aboveHintBased on the phase and gain cross over frequencies the control system is unstable when phase cross over frequency 117). What are the specifications of the frequency domain?Resonant peakResonant frequencyBandwidthAll of the aboveHintThe resonant peak, resonant frequency, bandwidth are the specifications of the frequency domain 118). How many types of connections are possible between the blocks?OneTwoThreeFourHintThree types of connections are possible between the blocks they are parallel, serial, and feedback connections 119). How many types of controllers are there?OneTwoThreeFourHintThere are four types of controllers are there they are proportional, integral, proportional integral, and proportional integral differential controllers 120). What are the functions of automatic control?MeasurementComparison, correctionComputationAll of the aboveHintThe measurement, comparison, correction, and computation are the functions of automatic control 121). _______ is an example for natural control systemUniverseVehiclesHelicoptersNone of the aboveHintThe universe is an example of natural control system 122). ________ is an example for manmade control systemUniverseVehiclesHuman bodyNone of the aboveHintThe vehicle is an example of a manmade control system 123). ________ is an example for automatic control systemHuman body temperature controlWater level controlVehiclesNone of the aboveHintHuman body temperature control is an example of an automatic control system 124). ________ is an example for manual control systemHuman body temperature controlWater level controlVehiclesNone of the aboveHintWater level control is an example of a manual control system 125). The close loop control systems are categorized into ______OneTwoThreeFourHintThe close loop control systems are categorized into two types they are linear and non-linear closed-loop control systems 126). The non-linear closed-loop control systems are again categorized into ______OneTwoThreeFourHintThe non-linear closed-loop control systems are again categorized into two types they are time-variant and time-invariant 127). The open-loop and closed-loop control systems are ________Natural control systemsManmade control systemsBoth a and bNone of the aboveHintThe open-loop and closed-loop control systems are manmade control systems 128). The AC servo system has __________Low efficiencyLow power outputFewer stability problemsAll of the aboveHintThe AC servo system has low efficiency, low power output, and fewer stability problems 129). The DC servo system has __________High efficiencyHigh power outputMore stability problemsAll of the aboveHintThe DC servo system has high efficiency, high power output, and more stability problems 130). Which servo system has non-linear characteristics?AC servo systemDC servo systemBoth a and bNone of the aboveHintThe AC servo system has non-linear characteristicsControl System Important MCQs 131). The linear closed-loop control systems are again categorized into ______OneTwoThreeFourHintThe linear closed-loop control systems are again categorized into two types they are time-variant and time-invariant 132). Which control system is a non-feedback control system?Open-loopClosed-loopBoth a and bNone of the aboveHintThe open-loop control system is a non-feedback control system 133). How many types of transfer function model analyses are there?OneTwoThreeFourHintThere are two types of transfer function model analysis are there they are response analysis and stability analysis 134). Which one is a response analysis of the transfer function model?Time-domain analysisFrequency domain analysisBoth a and bNone of the aboveHintBoth time and frequency domain analyses are response analysis of the transfer function model 135). Which one is a stability analysis of the transfer function model?Function modelNyquistBode plotGain and phase marginsAll of the aboveHintThe function model, Nyquist, bode plot, gain, and phase margins are the stability analysis of the transfer function model 136). How many types of cascade connections are there?OneTwoThreeFourHintThere are two types of cascade connections are there they are interactive and non-interactive cascade 137). ________ are the applications of DC servomotorMachine toolsProcess controllersRoboticsAll of the aboveHintThe machine tools, process controllers, robotics, etc are the applications of DC servomotor 138). How many types of actuators are there?OneTwoThreeFourHintThere are three types of actuators are there they are hydraulic and pneumatic actuators and electric actuators 139). The fluid used in pneumatic system is ________AirOilWaterNone of the aboveHintThe fluid used in the pneumatic system is air 140). The fluid used in hydraulic system is ________AirOilWaterNone of the aboveHintThe fluid used in the hydraulic system is oil 141). Which system is explosion-proof and fire-proof?PneumaticHydraulicBoth a and bNone of the aboveHintThe Pneumatic system is explosion-proof and fire-proof 142). The non-linearities are categorized into _________OneTwoThreeFourHintThe non-linearities are categorized into two types they are inherent and intentional non-linearities 143). The electric actuators are categorized into _________OneTwoThreeFourHintThe electric actuators are categorized into three types they are DC motor, stepper motor, and AC motor 144). The stepper motors are of _______OneTwoThreeFourHintThe stepper motors are of two types they are variable reluctance motor and permanent magnet motor 145). _________ sensor is used in home heating systemsTemperature sensorThermostat sensorFloat sensorNone of the aboveHintA temperature sensor is used in home heating systems 146). _________ sensor is used in automotive engineTemperature sensorThermostat sensorFloat sensorNone of the aboveHintThe thermostat sensor is used in automotive engine Read more about Sensors 147). _________ sensor is used in toilet tank water levelTemperature sensorThermostat sensorFloat sensorNone of the aboveHintFloat sensor is used in toilet tank water level 148). The multimedia contains _______Voice, musicVideo, animationGraphicsAll of the aboveHintThe multimedia contains voice, music, video, animation, and graphics 149). The regenerative feedback is also known as ______Positive feedbackNegative feedbackBoth a and bNone of the aboveHintThe regenerative feedback is also known as positive feedback 150). Which magnet is used in DC motor construction?Permanent magnetPlasticsElectromagnetNone of the aboveHintThe permanent magnet is used in DC motor construction 151). The rotors has _________No windingsNo brushesNo commutatorsAll of the aboveHintThe rotors have no windings, brushes, & commutators 152). Which valve restricts the airflow?Throttle valveShuttle valveBoth a and bNone of the aboveHintThe valve which restricts the airflow is a throttle valve 153). For a unit step input the steady-state error is _______1/1+KP1/1-KP1/KPNone of the aboveHintFor a unit step input the steady-state error is 1/1+KP 154). The control systems invented by ______James Clerk MaxwellCharlesDenis PapinNone of the aboveHintThe control systems invented by James Clerk Maxwell 155). In control systems the controller output is given to __________AmplifierSensorFinal control elementNone of the aboveHintIn control systems, the controller output is given to the final control element 156). ____________ signal is an input to the controllerErrorServoSensedNone of the aboveHintThe error signal is an input to the controller 157). The low power AC motors and DC motors are called as ________TachogeneratorsAC and DC generatorsServomotorsNone of the aboveHintThe low power AC motors and DC motors are called servo motors 158). The lubricator is a _____ element in the pneumatic circuitFirstSecondThirdLastHintThe lubricator is the last element in the pneumatic circuit 159). The peak overshoot and damping ratio are measures of ____________Speed of responseSteady-state errorBoth a and bNone of the aboveHintThe peak overshoot and damping ratio are measures of speed of response 160). In a closed-loop control system, the peak percentage overshoot is around _______20%30%40%16.3%HintIn a closed-loop control system, the peak percentage overshoot is around 16.3%Control Systems Important MCQs for Students 161). Hydraulic controller requires __________ operationHigh speedHigh torqueBoth a and bNone of the aboveHintHydraulic controller requires both high speed and high torque operations 162). Pneumatic controller requires __________ for its operationAirGas fuelBoth a and bNone of the aboveHintPneumatic controller requires air and gas fuel for its operation Read more about Temperature Controller 163). The electronic controller operation is __________FlexibleNot flexibleRequires high torque operationNone of the aboveHintThe electronic controller operation is flexible 164). For minimum phase system poles lies on __________ and zeros lies on _______planePoles lies on leftPoles lies on the rightZeros lies on leftBoth a and cHintFor the minimum phase system poles lies on the left plane and zeros also lies on the left plane 165). For non minimum phase system poles lies on __________ and zeros lies on _______planePoles lies on leftZeros lies on the rightZeros lies on leftBoth a and bHintFor the non-minimum phase system poles lies on the left plane and zeros lies on the right plane 166). The minimum phase system and all-pass system constitute _______Maximum phase systemNon-maximum phase systemMinimum phase systemNon-minimum phase systemHintThe minimum phase system and all-pass system constitute a non-minimum phase system 167). The radius size for Nyquist contour is _______OneZeroInfiniteNone of the aboveHintThe radius size for Nyquist contour is infinite 168). _________ margin measures relative stabilityPhaseGainBoth a and bNone of the aboveHintBoth phase and gain margins measures relative stability 169). Gain margin is __________ in second-order systemOneZeroInfiniteNone of the aboveHintThe gain margin is infinite in a second-order system 170). The measure of relative stability is __________ in frequency domainPhase marginResonant peakBoth a and bNone of the aboveHintThe measure of relative stability is phase margin and resonant peak in the frequency domain 171). The speed of response in the time domain is measure in terms of _______Settling and rise timeNatural frequencyBoth a and bNone of the aboveHintThe speed of response in the time domain is measure in terms of natural frequency, settling, and rise time 172). The speed of response in the frequency domain is measure in terms of _______Settling and rise timeResonant peakBandwidthBoth b and cHintThe speed of response in the frequency domain is measure in terms of resonant peak and bandwidth 173). AC servomotor is a __________ induction motorSingle phaseDouble phaseTriple phaseNone of the aboveHintAC servomotor is a triple-phase induction motor 174). The raster images also called as _______ imagesClipartVectorBitmapNone of the aboveHintThe raster images also called bitmap images 175). In a closed-loop system the relation between output response and input signal is ________LinearParabolicNon-linearNone of the aboveHintIn a closed-loop system, the relation between output response and the input signal is linear Time is Up! Time's up