Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

In figure the bridge is balanced when Z4 is
A:
120∠70°
B:
187.5∠ - 10°
C:
187.5∠ - 70°
D:
333.3∠ - 70°
Answer: C

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It is required to measure angular position. Out of the transducers
  1. Circular potentiometer
  2. LVDT
  3. E pick up
  4. Synchro
The proper devices are
A:
1, 2, 3, 4
B:
2 and 3
C:
1, 2, 4
D:
1 and 4
Answer: D

LVDT and E pickup are suitable for linear displacement.

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In two wattmeter method of 3 phase power measurement, when does one wattmeter read negative
A:
when power factor is less than 0.5 lagging
B:
when power factor is greater than 0.5 lagging
C:
when power factor is less than 0.5
D:
when power factor is unity
Answer: C

When p.f. is less than 0.5 (leading or lagging) one of the wattmeters reads negative.

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Loss of charge method is suitable for medium resistances.
A:
True
B:
False
C:
D:
Answer: B

It is suitable for high resistances.

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A dynamometer wattmeter is connected in ac circuit. The measured power is
A:
rms power
B:
average power
C:
peak power
D:
instantaneous power
Answer: B

All wattmeters measure average power over a cycle.

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