AC AND DC MEASURING INSTRUMENTS - Practice Mode

1) Which meter movement is not affected by stray magnetic fields?

PMMC meter Thermo couple meter MI meter - attraction type MI meter - Repulsion type

Correct Answer: PMMC meter

2) Which characteristics enable the deflection of pointer in the attraction type moving iron meter?

Weight of the soft iron pieces Deflection is inversely proportional to current Deflection is independent of current direction Deflecting and controlling torques are

Correct Answer: Deflection is independent of current direction

3) Which band of frequency is used for RADAR in frequency spectrum allotted by the International Telecommunication Union (ITU)?

ITU band - 4 ITU band - 6 ITU band - 8 ITU band - 10

Correct Answer: ITU band - 10

4) Which control is used in repulsion type moving iron instrument to keep the pointer at zero position?

Spring control Air damping control Magnetic repulsion control Magnetic attraction control

Correct Answer: Spring control

5) Which frame is used for winding the coil of PMMC meter?

Steel frame Wooden frame Ceramic frame Aluminium frame

Correct Answer: Aluminium frame

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