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Electronics and Communication Engineering - Measurements and Instrumentation

Exercise : Measurements and Instrumentation - Section 1
26.
Magnetic flux density has the dimensions
MI-1T-2
M-1I-2T-2
ML-3T-2
MI-1T-3
Answer: Option
Explanation:

Flux density = flux/area.

27.
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
490 Ω
5000 Ω
4900 Ω
5100 Ω
Answer: Option
Explanation:

.

28.
In a resistance strain gauge, G = 2, stress = 1050 kg/cm2, R = 1000 Ω. The value of ΔR will be
2 Ω
3 Ω
4 Ω
1 Ω
Answer: Option
Explanation:

.

29.
The household energy meter is
indicating instrument
recording instrument
integrating instrument
none of the above
Answer: Option
Explanation:

It integrates energy over a period of time.

30.
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
1.39 V
0.75 V
13.9 V
7.45 V
Answer: Option
Explanation:

.

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