Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

A sinusoidal signal is measured by CRO. The scale is set at 4 mV/cm. If vertical distance between positive and negative peaks is 6 cm, the peak value of ac signal is
A:
6 mV
B:
12 mV
C:
24 mV
D:
3 mV
Answer: B

, Peak to peak value will be 24 mV.

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

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

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Which of the following does not use the principle of change in inductance?
A:
LVDT
B:
Inductance displacement transducer
C:
Strain gauge
D:
Reluctance pick up
Answer: C

In strain gauge change in resistance occurs.

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The function of shunt in an ammeter is to
A:
by pass the current
B:
increase sensitivity of meter
C:
increase resistance of meter
D:
all of the above
Answer: A

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

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Two resistance R1 and R2 are connected in series R1 = 528 ± 5 Ω and R2 = 325 ± 3Ω. The total resistance will be
A:
853 ± 2 Ω
B:
853 ± 5 Ω
C:
853 ± 3 Ω
D:
853 ± 8 Ω
Answer: D

Both errors can be positive or negative simultaneously.

Hence 853 ± 8 Ω.

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