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Electronics and Communication Engineering - Measurements and Instrumentation

Exercise : Measurements and Instrumentation - Section 2
46.
A meter having 0-1000 μA range and 1000 Ω resistance is required to be changed to 0-100 mA meter. The value of shunt resistance is about
1 Ω
10 Ω
99 Ω
100 Ω
Answer: Option
Explanation:

.

47.
An induction wattmeter can be used for
dc only
50 Hz ac only
both ac and dc
high frequency ac only
Answer: Option
Explanation:

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

48.
In the balanced bridge shown in figure. X should be
a self inductance having resistance
a capacitance
a non-inductive resistance
an inductance and capacitance in parallel
Answer: Option
Explanation:

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

49.
If the current in a capacitor leads the voltage by 80°, the loss angle of capacitor is
80°
10°
100°
170°
Answer: Option
Explanation:

Loss angle δ = 90 - 80 = 10°.

50.
In an induction wattmeter, the shading bands are made of non conducting material.
True
False
Answer: Option
Explanation:

The shading bands are of conducting material.

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