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Electronics and Communication Engineering - Measurements and Instrumentation

Exercise : Measurements and Instrumentation - Section 7
21.
In a single phase power factor meter the phase difference between currents in the two pressure coils is
exactly 0°
approximate 0°
exactly 90°
approximate 90°
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
In an ac coordinate potentiometer, the currents inphase and quadrature potentiometer are adjusted to be
out of phase by 90°
in phase
out of phase by 45°
out of phase 180°
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
Both X and Y plates of a CRO are excited by ac signals. The display is an ellipse which makes one rotation in 5 seconds. This means that
the frequency of one input is 5 times that of other
the difference between the frequencies of the two signals is one fifth of hertz
the difference between the frequencies of the two signals is 5 Hz
either (a) or (c)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
In order to achieve accuracy, the slide wire of a potentiometer should be
as long as possible
as short as possible
neither too long nor too short
very thin
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
In measuring resistance using voltmeter and ammeter, the resistances of voltmeter and ammeter also affect the accuracy of measurement.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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