PMMC Instrument Question & AnswersMay 23, 2022 By WatElectronics This article lists 100 PMMC Instrument MCQs for Engineering Students. All the PMMC Instrument Questions & Answers given below includes solution and link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams and interviews, or professionals who would like to brush up on the fundamentals of the PMMC instrument.The PMMC instrument and dynamometer are two types of moving coil instruments. The PMMC is one of the moving coil instruments used only for DC. The dynamometer is also one of the moving coil instruments but this instrument is used on either ac or dc. The instruments are of two types they are absolute instruments and secondary instruments. The recording, indicating, and integration are the types of secondary instruments. The wattmeter and ampere-hour meters are examples of the secondary instruments,s, and the tangent, the galvanometer is an example of an absolute instrument. The damping in permanent magnet moving coil instruments is provided by eddy current damping, the PMMC instruments are one type of spring-controlled instruments and the instruments are delicate, accurate, and sensitive. The permanent magnet moving coil instruments work on the DC motor principle, whereas the moving iron instruments work on the principle of magnetism. The deflection torque in PMMC instruments is proportional to the square of the current and the controlling torque is proportional to the angle of deflection. 1). Which one of the following moving coil instruments is used only for DC? PMMC Dynamometer Both a and b None of the above HintThe dynamometer is also one of the moving coil instruments but this instrument is used on either ac or dc 2). Which one of the following is a moving iron type meter? Repulsion Electrodynamic Permanent magnet type None of the above HintThe permanent magnet, and electrodynamic are the two types of moving coil type meters 3). Which one of the following is a type of indicating instrument? X-Y plotters Watt-hour meter Wattmeters and ammeters All of the above HintThe X-Y plotters is one type of recording instrument and watt-hour meter is a type of integrating instrument 4). Which one of the following instrument works on the principle of magnetism? Moving iron instruments Moving coil instruments Both a and b None of the above HintThe repulsion and attraction types are moving iron type meters 5). The deflection torque in moving coil instrument is proportional to _______________? Current Voltage Square of the current None of the above HintThe deflection torque in moving iron instrument is proportional to square of the current 6). In which one of the following instruments the damping is provided by eddy current? Moving coil Moving iron Both a and b None of the above HintThe moving coil instruments are spring controlled instruments 7). The cost of the moving coil is ___________________ compared to moving iron? High Very high Low Very low HintThe cost of the moving iron is very low when compared to moving coil 8). In which one of the following instruments the consumption of power is very low? Moving coil Moving iron Dynamometer None of the above HintThe power consumption is high in dynamometer compared to moving iron bad moving coil 9). In which one of the following instruments the torque weight is ratio is high? Moving coil Dynamometer Both a and b None of the above HintThe torque weight is ratio is small in dynamometer type instrument 10). The instruments are categorized into ______________ types? One Two Three Four HintThe tangent is the example for absolute instrument and the energy meter is an example for secondary instrument 11). Which one of the following instruments is a spring-controlled instruments? Moving coil Moving iron Both a and b None of the above HintThe moving coil instruments works on DC motor principle12). Which one of the following instruments is suitable for both dc as well as ac? Moving coil Dynamometer Moving iron Both b and c HintThe permanent magnet moving coil is not suitable for ac13). The accuracy and sensitivity are very poor in _________________ instrument? Add description here! Moving coil Dynamometer Both a and b None of the above HintThe accuracy and sensitivity are high in moving coil instrument14). In which one of the following instruments the conductor coil is used? Moving coil Moving iron Both a and b None of the above HintThe soft iron is used in moving iron instruments 15). Which one of the following meters is used to measure the current? Ammeter Voltmeter Both a and b None of the above HintThe meter which is used to measure the voltage is voltmeter16). Which one of the following meters have the high resistance? Ammeter Voltmeter Both a and b None of the above HintThe resistance is high in voltmeter and low in ammeter17). The changing of the range is possible in ____________ meter? Ammeter Voltmeter Both a and b None of the above HintThe changing of the range is not possible in ammeter 18). The resistance must be _____________ for an ideal voltmeter device? Zero Infinity One Finite HintThe resistance must be zero for an ideal ammeter device 19). Which one of the following is a low resistance instrument? Ammeter Voltmeter Both a and b None of the above HintThe voltmeter is a high resistance instrument 20). Which one of the following instruments is a type of secondary instrument? Recording Integrating Indicating All of the above HintThe energy meter is one of the examples for secondary instruments 21). Which one of the following meters always connected in parallel? Ammeter Voltmeter Both a and b None of the above HintThe ammeter instrument always connected in series 22). Which one of the following meters can work with or without magnetic field? Ammeter Galvanometer Both a and b None of the above HintThe magnetic field is required in galvanometer instrument 23). Which one of the following instruments displays the results in the form of binary bits? Analog instrument Digital instrument Both a and b None of the above HintThe analogue instrument displays the results in wave signal24). In which one of the following instruments the impedance is low? Analog instrument Digital instrument Both a and b None of the above HintIn digital instruments, the impedance is high when compared to an analog instruments 25). The air friction damping occurs in _____________ devices? Moving coil Moving iron Both a and b None of the above HintThe eddy current damping occurs in moving coil devices PMMC Instrument Important MCQs 26). In which one of the following instruments the scale is uniform? Moving coil Moving iron Both a and b None of the above HintIn moving iron instruments the scale is non-uniform 27). How many types of ammeters are there? One Two Three Four HintThe ammeters are of two types they are ac and dc ammeters28). Which one of the following meters measures the current? Ohmmeter Ammeter Both a and b None of the above HintThe ohmmeter instrument is used to measure the resistance 29). Which one of the following ohmmeters measures a large amount of resistance? Micro-ohmmeter Milli-ohmmeter Megohmmeter None of the above HintThe micro-ohmmeter measures a low amount of resistance 30). Which one of the following is an example for absolute instrument? Tangent Ampere-Hour meters Wattmeter All of the above HintThe wattmeter's, ampere-hour meters are examples for secondary instrument 31). The figure shown below is a block diagram of ____________ loud-speaker? Moving iron Moving coil Galvanometer HintThe figure shown above is one type of loudspeaker schematic diagram 32). The electro dynameter instruments are categorized into _____________ types? One Two Three Four HintThe electro dynameter instruments are categorized into three types they are electrodynamic ammeter, voltmeter, and wattmeter33). ___________ damping occurs in electro dynameter instruments? Air friction Eddy current Both a and b None of the above HintThe eddy current occurs in moving coil instruments 34). In under damped condition the response is _____________? Sluggish Oscillatory Both a and b None of the above HintIn over damped condition the response is sluggish 35). The Rayleigh current balance is an example for _____________ instrument? Absolute Secondary Both a and b None of the above HintThe Rayleigh current balance is an example for absolute instrument36). In which instruments the information is in direct pulses? Analog instruments Digital instruments Both a and b None of the above HintIn an analogue instrument the information is continuous 37). Which one of the following is used to measure coupling? Torque Moment Both a and b None of the above HintThe torque is a movement related force38). The Nm/resolution is an System Unit (SI) unit of ____________ ? Torque Moment Both a and b None of the above HintThe torque is a movement related force 39). Which one of the following is a movement related force? Torque Moment Both a and b None of the above HintThe moment is a static force, it's not a movement related force 40). Which one of the following is an example for secondary instrument? Tangent Wattmeter Galvanometer All of the above HintThe tangent, galvanometer are examples for absolute instrument41). Which one of the following instruments is a gravity-controlled instruments? Moving coil Moving iron Both a and b None of the above HintThe moving iron instruments works on magnetism principle 42). Which one of the following errors occurs due to carelessness of human while recording, reading, and calculating the results? Gross errors Observation errors Both a and b None of the above HintThe observation error made by observes, whereas the gross errors occurs due to carelessness of human while recording, reading, and calculating the results43). The float-type petrol tank level indicator is an example for ___________ instrument? Active Passive Both a and b None of the above HintThe pressure measuring device is an example for a passive instrument 44). In which one of the following control the controlling torque is varied? Gravity control Spring control Both a and b None of the above HintIn spring control the controlling torque is fixed 45). In which one of the following types of control the levelling is not required? Moving iron Electrostatic PMMC instruments None of the above HintIn PMMC instruments the levelling is not required but in moving iron the levelling is not required46). Which one of the following is an example for fluid friction damping? PMMC instruments Moving iron instruments Electrostatic instruments None of the above HintThe moving iron and electrodynamometer is an example for air damping 47). The moving iron and electrodynamometer are an example for ______________ damping? Air damping Fluid friction Eddy current None of the above HintThe electrostatic instruments is an example for fluid friction damping 48). Which one of the following is a type of absorption dynamometer? Belt transmission dynamometer Epicyclic dynamometer Rope brake dynamometer None of the above HintThe belt transmission dynamometer and epicyclic dynamometer is a type of transmission dynamometer 49). The transmission dynamometer is categorized into __________ types? One Two Three Four HintThe transmission dynamometer is categorized into three types they are belt transmission, epicyclic, and torsion dynamometers50). Which one of the following moving coil instruments is used only either ac or DC? PMMC Dynamometer Both a and b None of the above HintThe PMMC is one of the moving coil instruments which is used only for DC PMMC Instrument MCQs for Quiz 51). The series field winding shunt is an example for ___________ resistance? Low Medium High Very high HintThe multiplier resistance is an example for medium resistance and porcelain insulator, cables, etc are examples for high resistance 52). In which one of the following type ohmmeters the switch is required? Series Shunt Both a and b None of the above HintThe switch is not required in series type of ohmmeter53). The figure shown below is a construction diagram of ____________ instrument? Moving iron Moving coil Galvanometer None of the above HintThe PMMC instrument is one type of moving coil instrument 54). Which one of the following meters can be used to test transistors and diodes? Voltmeter Multi-meter Both a and b None of the above HintThe voltmeters can’t be used to test transistors and diodes55). The porcelain insulator is an example for ___________ resistance? Low Medium High Very low HintThe series field winding shunt is an example for low resistance 56). Which one of the following meters is based on zero deflection method? Potentiometer Voltmeter Both a and b None of the above HintThe potentiometer and voltmeter both measures unknown EMF57). The switch is not required in ___________ type of ohmmeter? Series Shunt Both a and b None of the above HintThe switch is required in shunt type of ohmmeter 58). The ohm scale is in the same direction with current scale in ___________ ohmmeter? Series Shunt Both a and b None of the above HintThe ohm scale and current in series type ohmmeter is in opposite direction59). The multiplier resistance is an example for ___________ resistance? Low Medium High Very high HintThe series field winding shunt is an example of low resistance and porcelain insulator, cables, etc are examples of high resistance 60). Which one of the following is a type of recording instrument? X-Y plotters Watt-hour meter Wattmeters and ammeters All of the above HintThe wattmeters and ammeters are type of indicating instruments and watt-hour meter is a type of integrating instrument 61). The pressure measuring device is an example for ___________ instrument? Active Passive Both a and b None of the above HintThe float-type petrol tank level indicator is an example of active instrument 62). The controlling torque can be obtained by controlling the __________ ? Spring Gravity Both a and b None of the above HintThe controlling torque can be obtained by controlling the spring and gravity63). The method of damping is ______________ in the induction type instrument? Eddy current Air friction Air or eddy current None of the above HintThe method of damping is eddy current in the induction type instrument64). The gravity spring is the method of control in ___________ type of instrument? Dynamometer Moving coil Thermocouple Electro static HintThe dynamometer, thermocouple, moving coil are the springs 65). The control systems are categorized into _____________ types? One Two Three Four HintThe control systems are categorized into two types they are spring and gravity controls66). In which one of the following control the controlling torque is fixed? Gravity control Spring control Both a and b None of the above HintThe controlling torque is varied in gravity control 67). Which one of the following is a type of transmission dynamometer? Belt transmission dynamometer Rope brake dynamometer Epicyclic dynamometer Both a and c HintThe rope brake dynamometer is a type of absorption dynamometer 68). The absorption dynamometer is categorized into __________ types? One Two Three Four HintThe absorption dynamometer is categorized into two types they are prony broke and rope broke dynamometers69). The ohm scale and current in series type ohmmeter is in __________ direction? Same direction Opposite direction Either in same or opposite None of the above HintThe ohm scale is in the same direction with current scale in shunt ohmmeter 70). Which one of the following is a type of integrating instrument? X-Y plotters Watt-hour meter Wattmeters and ammeters All of the above HintThe wattmeters and ammeters are type of indicating instruments and X-Y plotters are one type of recording instrument example ECG 71). Which one of the following meters measures the resistance? Ohmmeter Ammeter Both a and b None of the above HintThe ammeter instrument is used to measure the current 72). Which one of the following ohmmeters measures a low amount of resistance? Micro-ohmmeter Milli-ohmmeter Megohmmeter None of the above HintThe megohmmeter measures a large amount of resistance 73). Which one of the following meters can’t be used to test transistors and diodes? Voltmeter Multi-meter Both a and b None of the above HintThe multi-meters are can be used to test transistors and diodes74). Which one of the following damping occurs in moving coil instruments? Air friction Eddy current Both a and b None of the above HintThe air friction damping occurs in electro dynameter instruments 75). In over damped condition the response is _____________? Sluggish Oscillatory Both a and b None of the above HintIn under damped condition the response is oscillatory PMMC Instrument MCQs for Students 76). In which instruments the information is continuous? Analog instruments Digital instruments Both a and b None of the above HintIn digital instruments the information is in direct pulses 77). Which one of the following is a static force? Torque Moment Both a and b None of the above HintThe torque is a movement related force used to measure coupling 78). The systematic error is categorized into ____________ types? One Two Three Four HintThe systematic error is categorized into three types they are instrumental, environmental, and observational errors79). Which one of the following errors made by observes? Gross errors Observation errors Both a and b None of the above HintThe gross errors occur due to carelessness of human while recording, reading, and calculating the results 80). Which one of the following instrument works on the principle of DC motor? Moving iron instruments Moving coil instruments Both a and b None of the above HintThe ammeter, voltmeter, galvanometer, etc are the examples of moving coil instruments 81). Which one of the following is a high resistance instrument? Ammeter Voltmeter Both a and b None of the above HintThe ammeter is a low resistance instrument 82). Which one of the following meters always connected in series? Ammeter Voltmeter Both a and b None of the above HintThe voltmeter instrument always connected in parallel 83). Which one of the following meters require magnetic field? Ammeter Galvanometer Both a and b None of the above HintThe ammeter instrument can work with or without magnetic field 84). Which one of the following instruments displays the results in wave signal? Analog instrument Digital instrument Both a and b None of the above HintThe digital instrument displays the results in the form of binary bits 85). In which one of the following instruments the impedance is high? Analog instrument Digital instrument Both a and b None of the above HintIn an analogue instrument the impedance is low when compare to digital instruments 86). The eddy current damping occurs in _____________ devices? Moving coil Moving iron Both a and b None of the above HintThe air friction damping occurs in moving iron devices 87). In which one of the following instruments the scale is non-uniform? Moving coil Moving iron Both a and b None of the above HintIn moving coil instruments the scale is uniform 88). The ammeters are categorized into _____________ types? One Two Three Four HintThe ammeters are categorized into four types they are PMMC ammeter, moving iron ammeter, electrodynamometer, and rectifier type ammeter89). The ohmmeters are categorized into _____________ types? One Two Three Four HintThe ohmmeters are categorized into three types they are shit, series, and multirange ohmmeters Read more about Ohmmeter90). The deflection torque in moving iron instrument is proportional to _______________? Current Square of the current Voltage None of the above HintThe deflection torque in moving coil instrument is proportional to current91). The cost of the moving iron is ___________________ compared to moving coil? High Low Very high Either high or low HintThe cost of the moving coil is very high when compared to moving iron92). In which one of the following instruments the consumption of power is high? Moving coil Moving iron Both a and b None of the above HintThe power consumption is very low in moving coil instruments 93). In which one of the following instruments the torque weight is ratio is small? Moving coil Dynamometer Both a and b None of the above HintThe torque weight is ratio is high in permanent magnet moving coil instrument 94). In which one of the following instruments the accuracy and sensitivity is high? Moving coil Dynamometer Both a and b None of the above HintThe accuracy and sensitivity are poor in dynamometer instrument 95). In which one of the following instruments the iron is used? Moving coil Moving iron Both a and b None of the above HintThe conductor coil is used in moving coil instruments96). Which one of the following meters is used to measure the voltage? Ammeter Voltmeter Both a and b None of the above HintThe meter which is used to measure the current is ammeter97). Which one of the following meters have the low resistance? Ammeter Voltmeter Both a and b None of the above HintThe resistance is high in voltmeter and low in ammeter 98). The changing of the range is not possible in ____________ meter? Ammeter Voltmeter Both a and b None of the above HintIn voltmeter the changing of the range is possible99). The resistance must be _____________ for an ideal ammeter device? Zero Infinity One Finite HintThe resistance must be infinity for an ideal voltmeter device 100). In which one of the following instruments the damping is provided by air damping? Moving coil Moving iron Both a and b None of the above HintThe moving iron instruments are gravity-controlled instruments Read more about PMMC Instrument For More MCQsMeasurement and Instrumentation Please fill in the comment box below. Time is Up! Time's up
