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Electronics and Communication Engineering - Measurements and Instrumentation

Exercise : Measurements and Instrumentation - Section 4
21.
If A = 131 ± 4 and B = 106 ± 4, the percentage range of doubt in A - B is
4%
8%
16%
32%
Answer: Option
Explanation:

(A - B) = 25 ± 8. Therefore, % range of doubt .

22.
Two resistance R1 and R2 are connected in series R1 = 528 ± 5 Ω and R2 = 325 ± 3Ω. The total resistance will be
853 ± 2 Ω
853 ± 5 Ω
853 ± 3 Ω
853 ± 8 Ω
Answer: Option
Explanation:

Both errors can be positive or negative simultaneously.

Hence 853 ± 8 Ω.

23.
The function of shunt in an ammeter is to
by pass the current
increase sensitivity of meter
increase resistance of meter
all of the above
Answer: Option
Explanation:

It bypasses a major portion of circuit current so that only the rated current of meter can flow through the meter.

24.
Which of the following does not use the principle of change in inductance?
LVDT
Inductance displacement transducer
Strain gauge
Reluctance pick up
Answer: Option
Explanation:

In strain gauge change in resistance occurs.

25.
It is necessary to measure the amplitudes of two signals and also the phase difference between them. This can be done by using a
phase meter
waveform meter
vector voltmeter
digital voltmeter
Answer: Option
Explanation:

A waveform meter is suitable to study amplitudes, phase angles etc. of different waveforms.

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