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PMMC Instrument Question & Answers

May 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?
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?
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?
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?
HintThe repulsion and attraction types are moving iron type meters 
5). The deflection torque in moving coil instrument is proportional to _______________?
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?
HintThe moving coil instruments are spring controlled instruments 
7). The cost of the moving coil is ___________________ compared to moving iron?
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?
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?
HintThe torque weight is ratio is small in dynamometer type instrument  
10). The instruments are categorized into ______________ types?
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?
HintThe moving coil instruments works on DC motor principle
12). Which one of the following instruments is suitable for both dc as well as ac?
HintThe permanent magnet moving coil is not suitable for ac
13). The accuracy and sensitivity are very poor in _________________ instrument?
Add description here!
HintThe accuracy and sensitivity are high in moving coil instrument
14). In which one of the following instruments the conductor coil is used?
HintThe soft iron is used in moving iron instruments 
15). Which one of the following meters is used to measure the current?
HintThe meter which is used to measure the voltage is voltmeter
16). Which one of the following meters have the high resistance?
HintThe resistance is high in voltmeter and low in ammeter
17). The changing of the range is possible in ____________ meter?
HintThe changing of the range is not possible in ammeter 
18). The resistance must be _____________ for an ideal voltmeter device?
HintThe resistance must be zero for an ideal ammeter device 
19). Which one of the following is a low resistance instrument?
HintThe voltmeter is a high resistance instrument 
20). Which one of the following instruments is a type of secondary instrument?
HintThe energy meter is one of the examples for secondary instruments 
21). Which one of the following meters always connected in parallel?
HintThe ammeter instrument always connected in series 
22). Which one of the following meters can work with or without magnetic field?
HintThe magnetic field is required in galvanometer instrument  
23). Which one of the following instruments displays the results in the form of binary bits?
HintThe analogue instrument displays the results in wave signal
24). In which one of the following instruments the impedance is low?
HintIn digital instruments, the impedance is high when compared to an analog instruments 
25). The air friction damping occurs in _____________ devices?
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?
HintIn moving iron instruments the scale is non-uniform 
27). How many types of ammeters are there?
HintThe ammeters are of two types they are ac and dc ammeters
28). Which one of the following meters measures the current?
HintThe ohmmeter instrument is used to measure the resistance 
29). Which one of the following ohmmeters measures a large amount of resistance?
HintThe micro-ohmmeter measures a low amount of resistance 
30). Which one of the following is an example for absolute instrument?
HintThe wattmeter's, ampere-hour meters are examples for secondary instrument 
31). The figure shown below is a block diagram of ____________ loud-speaker?
Schematic of a Moving Coil Loudspeaker
HintThe figure shown above is one type of loudspeaker schematic diagram 
32). The electro dynameter instruments are categorized into _____________ types?
HintThe electro dynameter instruments are categorized into three types they are electrodynamic ammeter, voltmeter, and wattmeter
33). ___________ damping occurs in electro dynameter instruments?
HintThe eddy current occurs in moving coil instruments  
34). In under damped condition the response is _____________?
HintIn over damped condition the response is sluggish 
35). The Rayleigh current balance is an example for _____________ instrument?
HintThe Rayleigh current balance is an example for absolute instrument
36). In which instruments the information is in direct pulses?
HintIn an analogue instrument the information is continuous 
37). Which one of the following is used to measure coupling?
HintThe torque is a movement related force
38). The Nm/resolution is an System Unit (SI) unit of ____________ ?
HintThe torque is a movement related force 
39). Which one of the following is a movement related force?
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?
HintThe tangent, galvanometer are examples for absolute instrument
41). Which one of the following instruments is a gravity-controlled instruments?
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?
HintThe observation error made by observes, whereas the gross errors occurs due to carelessness of human while recording, reading, and calculating the results
43). The float-type petrol tank level indicator is an example for ___________ instrument?
HintThe pressure measuring device is an example for a passive instrument 
44). In which one of the following control the controlling torque is varied?
HintIn spring control the controlling torque is fixed 
45). In which one of the following types of control the levelling is not required?
HintIn PMMC instruments the levelling is not required but in moving iron the levelling is not required
46). Which one of the following is an example for fluid friction damping?
HintThe moving iron and electrodynamometer is an example for air damping  
47). The moving iron and electrodynamometer are an example for ______________ damping?
HintThe electrostatic instruments is an example for fluid friction damping 
48). Which one of the following is a type of absorption dynamometer?
HintThe belt transmission dynamometer and epicyclic dynamometer is a type of transmission dynamometer 
49). The transmission dynamometer is categorized into __________ types?
HintThe transmission dynamometer is categorized into three types they are belt transmission, epicyclic, and torsion dynamometers
50). Which one of the following moving coil instruments is used only either ac or DC?
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?
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?
HintThe switch is not required in series type of ohmmeter
53). The figure shown below is a construction diagram of ____________ instrument?
PMMC Construction
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?
HintThe voltmeters can’t be used to test transistors and diodes
55). The porcelain insulator is an example for ___________ resistance?
HintThe series field winding shunt is an example for low resistance 
56). Which one of the following meters is based on zero deflection method?
HintThe potentiometer and voltmeter both measures unknown EMF
57). The switch is not required in ___________ type of ohmmeter?
HintThe switch is required in shunt type of ohmmeter 
58). The ohm scale is in the same direction with current scale in ___________ ohmmeter?
HintThe ohm scale and current in series type ohmmeter is in opposite direction
59). The multiplier resistance is an example for ___________ resistance?
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?
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?
HintThe float-type petrol tank level indicator is an example of active instrument 
62). The controlling torque can be obtained by controlling the __________ ?
HintThe controlling torque can be obtained by controlling the spring and gravity
63). The method of damping is ______________ in the induction type instrument?
HintThe method of damping is eddy current in the induction type instrument
64). The gravity spring is the method of control in ___________ type of instrument?
HintThe dynamometer, thermocouple, moving coil are the springs 
65). The control systems are categorized into _____________ types?
HintThe control systems are categorized into two types they are spring and gravity controls
66). In which one of the following control the controlling torque is fixed?
HintThe controlling torque is varied in gravity control 
67). Which one of the following is a type of transmission dynamometer?
HintThe rope brake dynamometer is a type of absorption dynamometer 
68). The absorption dynamometer is categorized into __________ types?
HintThe absorption dynamometer is categorized into two types they are prony broke and rope broke dynamometers
69). The ohm scale and current in series type ohmmeter is in __________ direction?
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?
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?
HintThe ammeter instrument is used to measure the current 
72). Which one of the following ohmmeters measures a low amount of resistance?
HintThe megohmmeter measures a large amount of resistance 
73). Which one of the following meters can’t be used to test transistors and diodes?
HintThe multi-meters are can be used to test transistors and diodes
74). Which one of the following damping occurs in moving coil instruments?
HintThe air friction damping occurs in electro dynameter instruments  
75). In over damped condition the response is _____________?
HintIn under damped condition the response is oscillatory 

PMMC Instrument MCQs for Students 

76). In which instruments the information is continuous?
HintIn digital instruments the information is in direct pulses 
77). Which one of the following is a static force?
HintThe torque is a movement related force used to measure coupling 
78). The systematic error is categorized into ____________ types?
HintThe systematic error is categorized into three types they are instrumental, environmental, and observational errors
79). Which one of the following errors made by observes?
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?
HintThe ammeter, voltmeter, galvanometer, etc are the examples of moving coil instruments 
81). Which one of the following is a high resistance instrument?
HintThe ammeter is a low resistance instrument 
82). Which one of the following meters always connected in series?
HintThe voltmeter instrument always connected in parallel 
83). Which one of the following meters require magnetic field?
HintThe ammeter instrument can work with or without magnetic field 
84). Which one of the following instruments displays the results in wave signal?
HintThe digital instrument displays the results in the form of binary bits 
85). In which one of the following instruments the impedance is high?
HintIn an analogue instrument the impedance is low when compare to digital instruments 
86). The eddy current damping occurs in _____________ devices?
HintThe air friction damping occurs in moving iron devices 
87). In which one of the following instruments the scale is non-uniform?
HintIn moving coil instruments the scale is uniform  
88). The ammeters are categorized into _____________ types?
HintThe ammeters are categorized into four types they are PMMC ammeter, moving iron ammeter, electrodynamometer, and rectifier type ammeter
89). The ohmmeters are categorized into _____________ types?
HintThe ohmmeters are categorized into three types they are shit, series, and multirange ohmmeters
Read more about Ohmmeter
90). The deflection torque in moving iron instrument is proportional to _______________?
HintThe deflection torque in moving coil instrument is proportional to current
91). The cost of the moving iron is ___________________ compared to moving coil?
HintThe cost of the moving coil is very high when compared to moving iron
92). In which one of the following instruments the consumption of power is high?
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?
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?
HintThe accuracy and sensitivity are poor in dynamometer instrument 
95). In which one of the following instruments the iron is used?
HintThe conductor coil is used in moving coil instruments
96). Which one of the following meters is used to measure the voltage?
HintThe meter which is used to measure the current is ammeter
97). Which one of the following meters have the low resistance?
HintThe resistance is high in voltmeter and low in ammeter 
98). The changing of the range is not possible in ____________ meter?
HintIn voltmeter the changing of the range is possible
99). The resistance must be _____________ for an ideal ammeter device?
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?
HintThe moving iron instruments are gravity-controlled instruments 
Read more about PMMC Instrument 

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