Electronics and Communication Engineering - Measurements and Instrumentation

1. 

Assertion (A): If the resistance of shunt of an ammeter is increased, the range of ammeter is reduced.

Reason (R): If the series resistance of a voltmeter is increased, the range of voltmeter is increased.

A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true R is false
D. A is false R is true

Answer: Option B

Explanation:

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2. 

Two sinusoidal signals of equal amplitude and frequency are applied to X and Y plate of CRO respectively. The observed Lissajous pattern is a straight line. The phase shift between signals is

A. zero
B. 90°
C. either zero or 180°
D. either 90° or 270°

Answer: Option C

Explanation:

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3. 

The scale of a dynamometer is linear when used as

A. ammeter
B. voltmeter
C. wattmeter
D. both (a) and (c)

Answer: Option C

Explanation:

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4. 

Three phase four wire induction energy meter is used to measure

A. energy in 3 phase balanced star load
B. energy in 3 phase balanced delta load
C. energy in 3 phase unbalanced load
D. either (a) or (b)

Answer: Option C

Explanation:

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5. 

Thermistors are made of

A. pure metals
B. pure insulators
C. tintered mixture of metallic oxides
D. pure semiconductors

Answer: Option C

Explanation:

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