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Electronics and Communication Engineering - Measurements and Instrumentation

Exercise : Measurements and Instrumentation - Section 1
6.
If reference sound pressure P0 is 2 x 10-5 N/m2, a sound pressure of 90 dB is equal to
0.632 N/m2
0.707 N/m2
0.835 N/m2
0.925 N/m2
Answer: Option
Explanation:

.

7.
Which of the following voltmeters would you use for measuring voltage across 20 kΩ resistance?
Voltmeter having a resistance of 5 kΩ
Voltmeter having a sensitivity of 1 kW/V
Voltmeter having sensitivity of 10 kW/V
None of the above
Answer: Option
Explanation:

Resistance of voltmeter should be very high as compared to 20 kΩ.

8.
A single phase energy meter has the rating 1200 resolutions/ kWh. If a 500 W electric gadget is used for 4 hours, the energy meter will make
1200 revolutions
1800 revolutions
2100 revolutions
2400 revolutions
Answer: Option
Explanation:

0.5 x 4 = 2 kWh = 2 x 1200 revolutions.

9.

Assertion (A): De sauty's bridge is suitable only for pure capacitor.

Reason (R): Capacitors are mostly perfect.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true R is false
A is false R is true
Answer: Option
Explanation:

Capacitors are mostly imperfect.

10.
In which of the transformer is the secondary nearly short circuited under normal operating conditions?
CT
PT
Distribution transformer
Power transformer
Answer: Option
Explanation:

CT is operated with secondary short-circuited otherwise a high emf would be induced across secondary.

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