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measurement and instrumentation MCQs

Practise focused measurement and instrumentation questions with marked answers for exam preparation and subject revision.

measurement and instrumentation Mcqs
1. Wattmeter cannot be designed on the principle of_________________?
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A. moving iron instrument

B. thermocouple instrument

C. electrostatic instrument

D. electrodynamic instrument

2. A moving-coil permanent-magnet instrument can be used as ____________by using a low resistance shunt?
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A. voltmeter

B. ammeter

C. flux-meter

D. ballistic galvanometer

3. The desirable static characteristics of a measuring system are______________?
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A. accuracy and reproducibility

B. accuracy, sensitivity and reproducibility

C. static error

D. drift and dead zone

4. If an instrument has cramped scale for larger values, then it follows________________?
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A. none of the above

B. logarithmic law

C. square law

D. uniform law

5. A multirangq instrument has________________?
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A. variable turns of coil

B. any of the above

C. multicoii arrangement

D. multiple shunt or series resistances inside the meter

E. multi range meters inside the measurement system

6. Commonly used standard capacitor is______________?
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A. concentric cylindrical type

B. electrostatic type

C. multilayer parallel plate type

D. spherical type

7. A phase shifting transformer is used in conjunction with_______________?
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A. Crompton potentiometer

B. D.C. potentiometer

C. A.C. co-ordinate potentiometer

D. Drysdale potentiometer
8. A moving-coil permanent-magnet instrument can be used as flux-meter_____________?
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A. by eliminating the control springs

B. by making control springs of large moment of inertia

C. by using a low resistance shunt

D. by using a high series resistance

9. The ratio of maximum displacement deviation to full scale deviation of the instrument is called_______________?
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A. linearity

B. dynamic deviation

C. static sensitivity

D. precision or accuracy

10. Induction type single phase energy meters measure electric energy in_______________?
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A. Wh

B. kWh

C. kW

D. None of the above

E. VAR

11. The pointer of an indicating instrument should be______________?
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A. either A. or B.

B. neither A. nor B.

C. very light

D. very heavy

12. Which of the following is an essential part of a motor meter ?
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A. A braking device

B. An operating torque system

C. Revolution registering device

D. All of the above
13. In majority of instruments damping is provided by______________?
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A. eddy currents

B. fluid friction

C. all of the above

D. spring

14. A Weston synchronoscope is a________________?
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A. dynamometer instrument

B. moving iron instrument

C. none of the above

D. moving coil instrument

15. The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a _________________?
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A. three-phase winding

B. two-phase winding

C. single-phase winding

D. any of the above

16. In an AC. co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be_____________?
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A. out of phase by 30

B. out of phase by 90

C. out of phase by 180

D. out of phase by 0

E. out of phase by 60

17. The use of _________ instruments is merely confined within laboratories as standardizing instruments?
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A. indicating

B. integrating

C. none of the above

D. absolute

E. recording

18. Operating torques in analogue instruments are_______________?
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A. deflecting and damping

B. vibration and balancing

C. deflecting, control and damping

D. deflecting and control

19. Instrument transformers are_______________?
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A. potential transformers

B. current transformers

C. both A. and B.

D. power transformers

20. Resistances can be measured with the help of_______________?
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A. wattmeters

B. ammeters

C. ohmmeters and resistance bridges

D. voltmeters

E. all of the above

21. The electrical power to a meggar is provided by________________?
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A. any of the above

B. permanent magnet D.C. generator

C. AC. generator

D. battery

22. A universal RLC bridge uses_________________?
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A. Maxwell bridge configuration for measurement of inductance and De Santas bridge for measurement of capacitance

B. Any of the above

C. Maxwell Wein bridge for measurement of inductance and modified De Santys bridge for measurement of capacitance

D. Maxwell Wein bridge for measurement of inductance and Wein bridge for measurement of capacitance

23. A dynamometer wattmeter can be used for______________?
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A. both D.C. and A.C.

B. D.C. only

C. A.C. only

D. any of the above

24. To measure a resistance with the help of a potentiometer it is_________________?
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A. not necessary to standardise the potentiometer

B. necessary to use a volt ratio box in conjunction with the potentiometer

C. necessary to standardise the potentiometer

D. none of the above

25. In Weston synchronoscope the moving coil is connected across______________?
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A. any of the above

B. fixed coils

C. bus-bars

D. incoming alternator

26. In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of_________________?
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A. 0.5 Hz

B. 0.1 Hz

C. 1.5 Hz

D. 0.25 Hz

27. If an inductance is connected in one arm of bridge and resistances in the remaining three arms____________?
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A. the bridge can be balanced if the resistances have some specific values

B. the bridge cannot be balanced

C. the bridge can always be balanced

28. In a low power factor wattmeter the compensating coil is connected_______________?
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A. in parallel with pressure coil

B. in series with current coil

C. in series with pressure coil

D. in parallel with current coil

29. In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at_____________?
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A. 120

B. 90

C. 60

D. 0

30. In an energy meter braking torque is produced to________________?
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A. bring energy meter to stand still

B. safe guard it against creep

C. maintain steady speed and equal to driving torque

D. brake the instrument

31. The adjustment of position of shading bands, in an energy meter is done to provide______________?
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A. braking torque

B. friction compensation

C. none of the above

D. creep compensation

32. In a portable instrument, the controlling torque is provided by_____________?
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A. spring

B. all of the above

C. gravity

D. eddy currents

33. Which of the following properties a damping oil must possess ?
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A. The viscosity of the oil should not change with the temperature

B. Should be non-evaporating

C. Must be a good insulator

D. Should not have corrosive action upon the metal of the vane

E. All of the above
34. A __________ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly___________?
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A. damping

B. any of the above

C. controlling

D. deflecting

35. A sensitive galvanometer produces large deflection for a_______________?
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A. large value of current

B. none of the above

C. small value of current

D. large value of voltage

E. large value of power

36. An induction meter can handle current up to_____________?
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A. 30 A

B. 10:00 AM

C. 100 A

D. 60 A

37. For handling greater currents induction wattmeters are used in conjunction with______________?
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A. either of the above

B. potential transformers

C. power transformers

D. none of the above

E. current transformers
38. In a meggar controlling torque is provided by______________?
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A. eddy current

B. coil

C. spring

D. gravity

39. In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of___________?
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A. 1.5 Hz

B. 0.25 Hz

C. 0.1 Hz

D. 0.5 Hz
40. The rectifier instrument is not free from_______________?
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A. all of the above

B. wave shape error

C. frequency error

D. temperature error

41. According to application, instruments are classified as_____________?
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A. switch board

B. portable

C. both A. and B.

D. moving coil

E. moving iron

F. both D. and E.

42. For measuring current at high frequency we should use_______________?
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A. moving iron instrument

B. thermocouple instrument

C. electrostatic instrument

D. none of the above

43. A power factor meter has________________?
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A. one current circuit and one pressure circuit

B. one current circuit and two pressure circuits

C. two current circuits and one pressure circuit

D. none of the above

44. The two pressure coils of a single phase power factor meter have_________________?
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A. the same dimension but different number of turns

B. none of the above

C. the same dimensions and the same number of turns

D. the same number of turns but different dimensions

45. The power factor of a single phase load can be calculated if the instruments available are_____________?
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A. one voltmeter and one ammeter

B. one voltmeter, one ammeter and one wattmeter

C. any of the above

D. one voltmeter, one ammeter and one energy meter

46. Two holes in the disc of energy meter are drilled at the opposite sides of the spindle to_____________?
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A. eliminate creeping at no load

B. improve its ventilation

C. increase its deflecting torque

D. increase its braking torque

47. Systematic errors are_________________?
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A. observational errors

B. instrumental errors

C. all of the above

D. environmental errors

48. The function of shunt in an ammeter is to______________?
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A. by pass the current

B. increase the resistance of ammeter

C. increase the sensitivity of the ammeter

D. none of the above

49. To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken_______________?
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A. from a battery

B. any of the above

C. from a source which is not the same as the unknown voltage

D. from the same source as the unknown voltage
50. To avoid the effect of stray magnetic field in A.C. bridges we can use_______________?
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A. Wagner earthing device

B. magnetic screening

C. any of the above

D. wave filters