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Recent questions tagged pmmc

1 answer 4 views

State the function of former and control spring in PMMC instrument.

asked Sep 6, 2018 by Shimroz123
1 answer 8 views

‘PMMC instrument is not suitable to measure AC quantity’. State the reason.

asked Sep 6, 2018 by Shimroz123
1 answer 12 views

Name the material used for :- (i) Moving coil (ii) Permanent magnet in PMMC instrument.

asked Sep 6, 2018 by Shimroz123
1 answer 18 views

State the material used for moving coil and former for PMMC instruments. 

asked Sep 5, 2018 by Shimroz123
1 answer 9 views

State working principle of PMMC instrument.

asked Sep 5, 2018 by Shimroz123
1 answer 8 views

Compare PMMC & MI instrument.

asked Sep 5, 2018 by Shimroz123
1 answer 26 views

In a PMMC instrument, the damping provided is :  (A) air damping (C) eddy current damping (B) fluid damping (D) magnetic damping using a magnet

asked Apr 29, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 17 views

A PMMC instrument has FSD of 100 μA and a coil resistance of 1 kΩ. To convert the instrument into an ammeter with full scale deflection of 100 mA, the required shunt resistance is (A) 1 Ω (B) 1.001 Ω (C) 0.5 Ω (D) 10 Ω

asked Apr 28, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 27 views

When the voltage across a battery is measured using a D.C potentiometer, the reading shows 1.08 V. But when the same voltage is measured using a Permanent Magnet Moving Coil (PMMC) voltmeter, the voltmeter reading shows 0.99 V. If the resistance of the voltmeter is 1100 Ohm , the internal resistance of the battery, in Ohm , is (A) 150 (B) 100 (C) 50 (D) 200

asked Apr 26, 2018 in Electrical Measurements and Instrumentation by Shimroz123
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