Electrical Measurement MCQs Part 1
Contents
- 1 A galvanometer has
- 2 Which of the following wave has the least form factor
- 3 The multiplier and the meter coil in a voltmeter are connected in
- 4 An instrument used for measurement and control should preferably have
- 5 Which of following is correct with respect to Current Transformer (CT) and Potential Transformer (PT)
A galvanometer has
A galvanometer has
- Air friction damping
- Fluid friction damping
- Spring coil damping
- 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
- Square wave
- Rectangular wave
- Sine wave
- Triangular wave
Correct answer: 1. Square 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
- Series
- Parallel
- Series-parallel
- None of the above
Correct answer: 1. Series
An instrument used for measurement and control should preferably have
An instrument used for measurement and control should preferably have
- Dead zone and dead time
- Non-linear output
- Linear output and fast response
- 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)
- CT operates at almost the same flux density as a PT
- CT operates with a higher flux density than PT
- CT operates with considerably lower flux density than a PT
- 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