Measurement and Instrumentation MCQ Multiple Choice Questions - Page 2 for Practice

Q: 18. In a low power factor wattmeter the compensating coil is connected

Correct Answer is: in series with pressure coil

Q: 19. In a low power factor wattmeter the pressure coil is connected

Correct Answer is: to the load side of the current coil

Q: 22. In a Schering bridge the potential of the detector above earth potential is

Correct Answer is: a few volts only

Q: 23. In a single phase power factor meter the phase difference between the currents in the two pressure coils is

Correct Answer is: exactly 90Â°

Q: 25. In a Weston frequency meter, the magnetic axes of the two fixed coils are

Correct Answer is: perpendicular

Q: 26. In a Weston synchronoscope, the fixed coils are connected across

Correct Answer is: incoming alternator

Q: 27. In an AC. co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be

Correct Answer is: out of phase by 90Â°

Q: 28. In an Anderson bridge, the unknown inductance is measured in terms of

Correct Answer is: known capacitance and resistance

Q: 29. In an energymeter braking torque is produced to

Correct Answer is: maintain steady speed and equal to driving torque

Q: 30. In majority of instruments damping is provided by

Correct Answer is: eddy currents

Measurement and Instrumentation MCQ Questions for Practice

16. In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was

unity
0.8 lagging
0.8 leading
zero

17. In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at

0Â°
60Â°
90Â°
120Â°

18. In a low power factor wattmeter the compensating coil is connected

in series with current coil
in parallel with current coil
in series with pressure coil
in parallel with pressure coil

19. In a low power factor wattmeter the pressure coil is connected

to the supply side of the current coil
to the load side of the current coil
in any of the two meters at connection
none of the above

20. In a meggar controlling torque is provided by

spring
gravity
coil
eddy current

21. In a portable instrument, the controlling torque is provided by

spring
gravity
eddy currents
all of the above

22. In a Schering bridge the potential of the detector above earth potential is

a few volts only
1 kV
5 kV
10 kV

23. In a single phase power factor meter the phase difference between the currents in the two pressure coils is

exactly 0Â°
approximately 0Â°
exactly 90Â°
approximately 90Â°

24. In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of

0.1 Hz
0.25 Hz
0.5 Hz
1.5 Hz

25. In a Weston frequency meter, the magnetic axes of the two fixed coils are

parallel
perpendicular
inclined at 60Â°
inclined at 120Â°

26. In a Weston synchronoscope, the fixed coils are connected across

bus-bars
incoming alternator
a lamp
none of the above

27. In an AC. co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be

out of phase by 90Â°
out of phase by 60Â°
out of phase by 30Â°
out of phase by 0Â°

28. In an Anderson bridge, the unknown inductance is measured in terms of

known inductance and resistance
known capacitance and resistance
known resistance
known inductance

29. In an energymeter braking torque is produced to

safe guard it against creep
brake the instrument
bring energy meter to stand still
maintain steady speed and equal to driving torque

30. In majority of instruments damping is provided by

fluid friction
spring
eddy currents
all of the above