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Control Systems Question & Answers

June 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.

The stepper motors are used in computer peripheral systems, paper drive mechanisms, and automatic control systems. The air conditioners, refrigerators, power systems are examples of control systems. The Voltage stabilizers, Automatic electronic iron, Water tanks with float balls are examples of the closed-loop control system.

The control systems are used in electrical systems to control both voltage and current in the electrical system. The aircraft, Automobiles, Helicopters, etc are examples of the system. When a control system is exited with a standard input signal then the steady-state error may be zero or one or infinite.

1). How many types of control systems are there?

Hint
2). The advantages of an open-loop systems are __________

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3). What are the disadvantages of a closed-loop control system?

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4). Whenever the control system obeys the linearity and homogeneity then the system is ____________

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5). What are the advantages of a closed-loop control system?

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6). Whenever the control system doesn’t obey the linearity and homogeneity then the system is ____________

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7). If output is varying with time then the system is ____________

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8). What are the disadvantages of an open-loop control system?

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9). If output is not varying with time then the system is ____________

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10). If the control system is both linear and time-variant then the type of system is ____________

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11). If the control system is both linear and time-invariant then the type of system is ____________

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12). How many types of feedbacks are there?

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13). The transfer function of negative feedback is expressed as ________

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14). The transfer function of positive feedback is expressed as ________

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15). The transfer function is defined as a ratio of ______________

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16). The sensitivity is defined as a ___________

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17). How many types of mechanical systems are there based on the type of motion?

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18). What are the basic elements in the translational mechanical system?

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19). _________ mechanical systems move along a line

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20). What are the basic elements in the rotational mechanical system?

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Control System MCQs for Engineers

21). How many analyses do we have to convert any mechanical translational system into an electrical system?

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22). In force voltage analogy the mechanical system input is always considered as _______

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23). In force voltage analogy the mechanical system output is in terms of _______

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24). _________ mechanical systems will move along an axis

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25). For electrical system in force voltage analogy the input is always considered as _____________

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26). In force voltage analogy the electrical system output is in terms of ______

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27). In force current analogy the electrical system output is in terms of ______

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28). In torque voltage analogy the mechanical rotational system input is always considered as ____________

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29). Torque equation for mass is expressed as _________

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30). ___________ is a point representing a variable or signal

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31). In force current analogy the electrical system input is always considered as __________

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32). ______ is a node that contains only outgoing branches

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33). How many types of time-domain analyses are there?

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34). The response of the system which varies with time is known as ________

Hint
35). In torque voltage analogy the mechanical rotational system output is in terms of ____________

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36). Torque equation for dashpot is expressed as ________

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37). _____ is a node that has both outgoing and incoming branches

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38). In torque voltage analogy the electrical system is always considered as _________

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39). Torque equation for spring is expressed as ________

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40). ________ is a node that contains only incoming branches

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Control System MCQs for Quiz

41). In torque voltage analogy the electrical system output is in terms of ____________

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42). The response of a system that won’t change with time is known as__________

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43). What are the characteristics of the test signal?

Hint
44). _____________are the time domain specifications

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45). The time taken for the response to reach 50% of its final value from the very first time is known as _________

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46). The time taken for the response to reach 0-100% of its final value from the very first time is known as _________

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47). How many types of static error constants are there?

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48). The lag-lead compensator produces __________

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49). What are the effects of lag compensator?

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50). Compensators are used to __________

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51). The time taken for the response to reach the peak value is called as ________

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52). What are the effects of lead compensator?

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53). How many types of compensators are there based on connections?

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54). How many system analysis methods are there?

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55). _________ is a method which works based on transfer function

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56). The transfer-based method is applicable to ____________ system

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57). The state-space method is applicable to _________

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58). How many types of compensators are there?

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59). The dynamic systems are classified into ____________

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60). In which system the output at any instant of time depends only on past and current inputs?

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61). __________ controller produces an output which is derivative of error signal

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Control System MCQs with Hints

62). __________ controller produces an output which is integral of error signal

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63). __________ controller produces an output which is in the combination of the outputs of the proportional and derivative controller

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64). ___________ are used to determine the magnitude of CLTF using OLTF

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65). ___________ are used to determine the response of a closed-loop system using open-loop transfer function

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66). For non-minimum phase system the poles are _________

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67). How many plots do the bode plot consist of?

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68). In which frequency the maximum magnitude occurs?

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69). __________ is the frequency response technique

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70). The systems are categorized into _____________ types based on stability

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71). ____________ technique is used to calculate the stability

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72). When a control system is exited with a standard input signal then the steady-state error is __________

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73). The state error constants are categorized into _________

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74). _____________ are the examples of system

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75). The control systems are used in electrical systems to control _____________ in electrical system

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76). The example of an open-loop control system is _________

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77). The example of an closed-loop control system is _________

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78). What are the examples of control systems?

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79). ___________ is used to allow a signal to be used by two or more blocks or summing points

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80). _________ used for summation of two or more input signals

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Control System MCQs for Exams

81). How many outputs does the summing point have?

Hint
82). Which element indicated the direction of flow of signals in a system?

Hint
83). The force due to spring is expressed as __________

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84). The force due to damper is expressed as __________

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85). __________ are the basic elements of an electrical system

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86). _____________ is defined as the flux linkage per unit current

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87). _________ is defined as a ratio of the charge to the voltage across the capacitor terminals

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88). The potentiometers are categorized into _________

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89). The stepper motor is a __________ device

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90). The step size of the stepper motor is typically between ___________

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91). How many types of stepper motors are there?

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92). How many stator poles does a permanent magnet stepper motor have?

Hint
93). How many rotor poles does a permanent magnet stepper motor have?

Hint
Read more about Stator
Read more about Stepper Motor 
94). The full step angle of permanent magnet stepper motor is around _________

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95). _________ are the applications of stepper motor

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96). How many types of tacho generators are there?

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Read more about Generators
97). Tacho generator works on the principle of ___________generator

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98). The techo generator comprises of ___________

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99). How many types of servometers are there?

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100). Which servomotor is a DC servo meter?

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101). Error detector is available in _________ systems

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102). The feedback is available in ___________ control system

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103). In which control system the sensitivity is less?

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104). Which one is an example of servomechanism?

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105). Which one is an example for the regulator?

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106). How many types of hydraulic output devices are there?

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107). The transfer function of an integrator is expressed as _______

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108). The transfer function of an differentiator is expressed as _______

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109). The transfer function of a first-order system is expressed as _______

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110). ________ is an example for state variable

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111). Based on the gain and phase margins the control system is stable when _________

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112). Based on the gain and phase margins the control system is marginally stable when _________

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113). Based on the gain and phase margins the control system is unstable when _________

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114). Based on the phase and gain cross over frequencies the control system is stable when __________

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115). Based on the phase and gain cross over frequencies the control system is marginally stable when __________

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116). Based on the phase and gain cross over frequencies the control system is unstable when __________

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117). What are the specifications of the frequency domain?

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118). How many types of connections are possible between the blocks?

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119). How many types of controllers are there?

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120). What are the functions of automatic control?

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121). _______ is an example for natural control system

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122). ________ is an example for manmade control system

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123). ________ is an example for automatic control system

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124). ________ is an example for manual control system

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125). The close loop control systems are categorized into ______

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126). The non-linear closed-loop control systems are again categorized into ______

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127). The open-loop and closed-loop control systems are ________

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128). The AC servo system has __________

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129). The DC servo system has __________

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130). Which servo system has non-linear characteristics?

Hint

Control System Important MCQs

131). The linear closed-loop control systems are again categorized into ______

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132). Which control system is a non-feedback control system?

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133). How many types of transfer function model analyses are there?

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134). Which one is a response analysis of the transfer function model?

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135). Which one is a stability analysis of the transfer function model?

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136). How many types of cascade connections are there?

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137). ________ are the applications of DC servomotor

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138). How many types of actuators are there?

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139). The fluid used in pneumatic system is ________

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140). The fluid used in hydraulic system is ________

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141). Which system is explosion-proof and fire-proof?

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142). The non-linearities are categorized into _________

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143). The electric actuators are categorized into _________

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144). The stepper motors are of _______

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145). _________ sensor is used in home heating systems

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146). _________ sensor is used in automotive engine

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Read more about Sensors
147). _________ sensor is used in toilet tank water level

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148). The multimedia contains _______

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149). The regenerative feedback is also known as ______

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150). Which magnet is used in DC motor construction?

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151). The rotors has _________

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152). Which valve restricts the airflow?

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153). For a unit step input the steady-state error is _______

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154). The control systems invented by ______

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155). In control systems the controller output is given to __________

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156). ____________ signal is an input to the controller

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157). The low power AC motors and DC motors are called as ________

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158). The lubricator is a _____ element in the pneumatic circuit

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159). The peak overshoot and damping ratio are measures of ____________

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160). In a closed-loop control system, the peak percentage overshoot is around _______

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Control Systems Important MCQs for Students

161). Hydraulic controller requires __________ operation

Hint
162). Pneumatic controller requires __________ for its operation

Hint
Read more about Temperature Controller
163). The electronic controller operation is __________

Hint
164). For minimum phase system poles lies on __________ and zeros lies on _______plane

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165). For non minimum phase system poles lies on __________ and zeros lies on _______plane

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166). The minimum phase system and all-pass system constitute _______

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167). The radius size for Nyquist contour is _______

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168). _________ margin measures relative stability

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169). Gain margin is __________ in second-order system

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170). The measure of relative stability is __________ in frequency domain

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171). The speed of response in the time domain is measure in terms of _______

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172). The speed of response in the frequency domain is measure in terms of _______

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173). AC servomotor is a __________ induction motor

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174). The raster images also called as _______ images

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175). In a closed-loop system the relation between output response and input signal is ________

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