Electrical Measurement and Instrumentation MCQ

Q1. The most efficient form of damping employed in electrical instrument is

air damping

fluid friction

eddy currents

none of the above

Q2. Which of the following is the correct advantage of gravity control compared to spring control?

It is subjected to low fatigue

It also depends upon temperature

It is cheaper comparatively

It does not gives any cramped scale

Q3. By resolution of an indicating instrument is meant

the smallest change in the output reading due to drifting of pointer

the smallest change in applied stimulus which will indicate a detectable change in deflection

the difference between various readings for the same applied stimulus

none of these

Q4. An 0-10 A ammeter has a guaranteed accuracy of 1 percent of full scale deflection. The limiting error while reading 2.5 A is

1%

2%

4%

none of above

Q5. Which of the following is the disadvantage of PMMC instruments?

The PMMC is very delicate instrument

It has a high torque to weight ratio

It produces low losses due to hysteresis

It does not have uniformly divide scale

Q6. In an induction type of meter, maximum torque is produced when the phase angle between two fluxes is:

0°

45°

60°

90°

Q7. Potentiometer is basically a___________ instrument.

digital

deflection type

null type

recording

Q8. A potentiometer may be used for

Measurement of resistance

Calibration of ammeter and voltmeter

Measurement of current

All of the above

Q9. Which of the following is not an application of potentiometer?

Calibration of voltmeter

Calibration of ammeter

Testing of wattmeter

Testing of frequency meter

Q10. The secondary of a current transformer is always kept shorted under operating conditions because it

Avoids core saturation and high voltage induction

Protects the windings

Is safe to human beings

Protects the primary circuit

MCQ

MEASUREMENT & INSTRUMENTATION