Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

In an induction wattmeter, the shading bands are made of non conducting material.
A:
True
B:
False
C:
D:
Answer: B

The shading bands are of conducting material.

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If the current in a capacitor leads the voltage by 80°, the loss angle of capacitor is
A:
80°
B:
10°
C:
100°
D:
170°
Answer: B

Loss angle Îī = 90 - 80 = 10°.

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In the balanced bridge shown in figure. X should be
A:
a self inductance having resistance
B:
a capacitance
C:
a non-inductive resistance
D:
an inductance and capacitance in parallel
Answer: A

Since two primary of CT always remains, a high voltage is induced in secondary if the secondary is opened.

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An induction wattmeter can be used for
A:
dc only
B:
50 Hz ac only
C:
both ac and dc
D:
high frequency ac only
Answer: B

Induction principle is valid for ac only. Induction Instruments are calibrated for 50 Hz ac.

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A meter having 0-1000 ΞA range and 1000 ÎĐ resistance is required to be changed to 0-100 mA meter. The value of shunt resistance is about
A:
1 ÎĐ
B:
10 ÎĐ
C:
99 ÎĐ
D:
100 ÎĐ
Answer: B

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