Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

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: D

Electron gun consists of cathode, grid and accelerating anode.

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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: B

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

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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: D

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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: D

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

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

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