# Electrical Measurement MCQs Part 1

Electrical Measurement MCQs Part 1

## A galvanometer has

A galvanometer has

1. Air friction damping
2. Fluid friction damping
3. Spring coil damping
4. Eddy current damping

Correct answer: 4. Eddy current damping

Explanation:

A galvanometer has Eddy current damping.

Whenever a conductor moves in a magnetic field, it has an emf induced in it and if a closed path is provided, a current (known as eddy current) flows. Eddy currents (also called Foucault’s currents) are actually the loops of electrical current induced within conductors by a changing magnetic field. These currents interact with the magnetic field to produce an electromagnet torque which opposes the motion This torque is proportional to the strength of the magnetic field and the current produced. The galvanometer is provided with Eddy current damping.

## Which of the following wave has the least form factor

Which of the following wave has the least form factor

1. Square wave
2. Rectangular wave
3. Sine wave
4. Triangular wave

Explanation: Form factor formula = RMS value /Average value

## The multiplier and the meter coil in a voltmeter are connected in

The multiplier and the meter coil in a voltmeter are connected in

1. Series
2. Parallel
3. Series-parallel
4. None of the above

## An instrument used for measurement and control should preferably have

An instrument used for measurement and control should preferably have

2. Non-linear output
3. Linear output and fast response
4. A highly damped response

Correct answer: 3. Linear output and fast response

## Which of following is correct with respect to Current Transformer (CT) and Potential Transformer (PT)

Which of following is correct with respect to Current Transformer (CT) and Potential Transformer (PT)

1. CT operates at almost the same flux density as a PT
2. CT operates with a higher flux density than PT
3. CT operates with considerably lower flux density than a PT
4. No generalization can be made with regard to the flux densities in CT and PT

Correct answer: 3. CT operates with considerably lower flux density than a PT