Electrical Measurement and Measuring Instruments (3160915) MCQs

MCQs of Measurement of Parameters

Showing 51 to 60 out of 63 Questions
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51.

Which of following statement are correct in case of power factor meter?

(a)

The restoring torque is provided by a controlling torque.
(b)

It consist of two coils mounted at right angles to each other.
(c)

The deflection is proportional to phase angle between field coil and crossed coil.
(d)

Both B and C.
Answer:

Option (c)

52.

Potentiometer method of DC voltage measurement is more accurate than direct measurement using a voltmeter because

(a)

it loads the circuit moderately.
(b)

it loads the circuit to maximum extent.
(c)

it uses centre zero galvanometer instead of voltmeter.
(d)

it does not load the circuit at all.
Answer:

Option (d)

53.

The meter constant of a single phase 240 V induction watthour meter is 400 revolutions per KWh. The speed of the meter disc for a current of 10 Amperes of 0.8 p.f lagging will be

(a)

21.1 rpm.
(b)

18.2 rpm.
(c)

16.02 rpm.
(d)

12.8 rpm.
Answer:

Option (d)

54.

The measurment of very low and very high frequencies is invariably done using a frequency counter in which one of the following?

(a)

Period and frequency measurement modes respectively.
(b)

Frequency and period measurment modes, respectively.
(c)

Frequency measurment modes only.
(d)

Period measurment modes only.
Answer:

Option (d)

55.

When a potentiometer is used for measurement of voltage of an unknown source, the power consumed in the circuit of the unknown source under null condition is

(a)

high.
(b)

small.
(c)

ideally zero.
(d)

very high.
Answer:

Option (c)

56.

For measuring an AC voltage by an AC potentiometer it is desirable that the supply for the potentiometer is taken from

(a)

A battery.
(b)

The same source as the unknown voltage.
(c)

A source other than the source of unknown voltage.
(d)

Any of above.
Answer:

Option (b)

57.

The transfer instrument which is used for standardization of a polar type AC potentiometer is

(a)

an electrostatic instrument.
(b)

a moving coil instrument.
(c)

a thermal instrument.
(d)

a dynamometer instrument.
Answer:

Option (c)

58.

Standardization of potentiometer is done in order that, they become

(a)

accurate.
(b)

precise.
(c)

accurate and precise.
(d)

accurate and direct reading.
Answer:

Option (d)

59.

A DC potentiometer is the best means available for the measurement of DC voltage because

(a)

It is based on null balance technique.
(b)

It is possible to standardize before a measurement is undertaken.
(c)

The precision in measurment is independent of the type of the defector used.
(d)

None of above.
Answer:

Option (b)

60.

A 1 mA meter is to be converted to 1 A ammeter. The meter resistance is 100 Ω. The value of shunt resistance

(a)

0.001 Ω.
(b)

0.1001 Ω.
(c)

100 Ω.
(d)

1000 Ω.
Answer:

Option (b)

Showing 51 to 60 out of 63 Questions
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