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Electronics and Communication Engineering - Measurements and Instrumentation

Exercise : Measurements and Instrumentation - Section 1
46.
A dynamometer wattmeter is connected in ac circuit. The measured power is
rms power
average power
peak power
instantaneous power
Answer: Option
Explanation:

All wattmeters measure average power over a cycle.

47.
Loss of charge method is suitable for medium resistances.
True
False
Answer: Option
Explanation:

It is suitable for high resistances.

48.
In two wattmeter method of 3 phase power measurement, when does one wattmeter read negative
when power factor is less than 0.5 lagging
when power factor is greater than 0.5 lagging
when power factor is less than 0.5
when power factor is unity
Answer: Option
Explanation:

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

49.
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
1, 2, 3, 4
2 and 3
1, 2, 4
1 and 4
Answer: Option
Explanation:

LVDT and E pickup are suitable for linear displacement.

50.
In figure the bridge is balanced when Z4 is
120∠70°
187.5∠ - 10°
187.5∠ - 70°
333.3∠ - 70°
Answer: Option
Explanation:

.

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