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Electronics and Communication Engineering - Measurements and Instrumentation

Exercise : Measurements and Instrumentation - Section 2
16.
The power input and output in a device are 3650 W and 3385 W with each reading in doubt by ± 10 W. The percentage uncertainty in losses is
± 7.55%
± 3.77%
± 11.32%
± 15.09%
Answer: Option
Explanation:

Losses = 3650 - 3385 = 265 W uncertainty = ± 20 W.

.

17.
A meter coil has a resistance of 100 Ω and a full scale deflection current of 10 mA. To convert it into a voltmeter of 0-200 V range, the series resistance should be
20 kΩ
19.9 kΩ
1.9 kΩ
20.1 kΩ
Answer: Option
Explanation:

.

18.
Which of these has a magnetic brake?
Thermocouple ammeter
Energy meter
Dynamometer wattmeter
Frequency meter
Answer: Option
Explanation:

Braking torque, in an energy meter, is provided by a magnet.

19.
Two numbers are 131 ± 5 and 629 ± 3. The sum of the numbers with range of doubt is
760 ± 8
760 ± 2
760 + 8
760 - 8
Answer: Option
Explanation:

The numbers can be 131 + 5, 131 - 5, 629 - 3. Therefore, the sum can be 760 ± 8.

20.

Assertion (A): Schering bridge is a low voltage bridge.

Reason (R): Schering bridge is very commonly used for measurement of capacitance.

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:

Schering bridge is a high voltage bridge.

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