AC AND DC MEASURING INSTRUMENTS - Practice Mode

1) What is the purpose of damping torque in PMMC meter?

Control the pivot point Control the jewel bearing Control the magnetic field Control the swinging of the coil

Correct Answer: Control the swinging of the coil

2) Why the soft iron pieces in the moving iron meter is tongue shaped?

To generate heat To damp the oscillations To achieve uniformity of scale To produce magnetic attraction

Correct Answer: To achieve uniformity of scale

3) How the sensitivity of voltmeter is determined?

FSD current Meter coil resistance Ohms per volt rating Maximum voltage measurement

Correct Answer: Ohms per volt rating

4) What is the name of the procedure carried out to ensure the trustworthy standards of the measuring instrument?

Calibration Range test Re-alignment Testing standards

Correct Answer: Calibration

5) How the accuracy of amplitude and frequency measured by CRO is checked?

By sine wave signal By function generator By complex wave form By built-in calibration signal

Correct Answer: By built-in calibration signal

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