Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

A standard cell of 1.0185 V is used with a slide wire potentiometer. The balance was obtained at 60 cm. When an unknown emf was connected, the balance was obtained at 82 cm. The magnitude of unknown emf is
A:
1.39 V
B:
0.75 V
C:
13.9 V
D:
7.45 V
Answer: A

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The household energy meter is
A:
indicating instrument
B:
recording instrument
C:
integrating instrument
D:
none of the above
Answer: C

It integrates energy over a period of time.

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In a resistance strain gauge, G = 2, stress = 1050 kg/cm2, R = 1000 Ω. The value of ΔR will be
A:
2 Ω
B:
3 Ω
C:
4 Ω
D:
1 Ω
Answer: D

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A meter with a resistance of 100 Ω and a full scale deflection of current of 1 mA is to be converted into voltmeter of 0 - 5 V range. The multiplier resistance should be
A:
490 Ω
B:
5000 Ω
C:
4900 Ω
D:
5100 Ω
Answer: C

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Magnetic flux density has the dimensions
A:
MI-1T-2
B:
M-1I-2T-2
C:
ML-3T-2
D:
MI-1T-3
Answer: A

Flux density = flux/area.

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