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Electronics and Communication Engineering - Measurements and Instrumentation

Why Electronics and Communication Engineering Measurements and Instrumentation?

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Home » Engineering » Electronics and Communication Engineering » Measurements and Instrumentation » Section 1

Exercise :: Measurements and Instrumentation - Section 1

1. 

To increase Q factor of a coil, the wire should be
A. long
B. thin
C. thick
D. long and thin

Answer: Option C

Explanation:

Q is high if resistance is low. Therefore, wire should be thick.

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2. 

An ammeter of 0-25 A range has a guaranteed accuracy of 1% of full scale reading. The current measured is 5 A. The limiting error is
A. 2%
B. 2.5%
C. 4%
D. 5%

Answer: Option D

Explanation:

.

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3. 

The coil of a moving iron instrument has a resistance of 500 Ω and an inductance of 1 H. It reads 250 V when a 250 V dc is applied. If series resistance is 2000 Ω, its reading when fed by 250 V, 50 Hz ac will be
A. 260 V
B. 252 V
C. 250 V
D. 248 V

Answer: Option D

Explanation:

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4. 

In 3 phase power measurement by two wattmeter method, the reading of one wattmeter is zero. The power factor of load is
A. 1
B. 0.5
C. 0
D. 0.8

Answer: Option B

Explanation:

When p.f. = 0.5, 0 = 60° and one of the wattmeters reads zero.

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5. 

In a CRO which of the following is not a part of electron gun
A. cathode
B. grid
C. accelerating anode
D. X - Y plates

Answer: Option D

Explanation:

Electron gun consists of cathode, grid and accelerating anode.

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