Recent questions tagged coil

1 answer 11 views

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

asked Sep 6, 2018 by Shimroz123
1 answer 17 views

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

asked Sep 5, 2018 by Shimroz123
1 answer 41 views

The purpose of the restraining coil in a biased differential relay is  (A) To reduce CT saturation during fault.  (B) To increase the sensitivity of the relay.  (C) To match the transformation ratio.  (D) To limit the spill current through the relay during heavy external fault.

asked May 8, 2018 in Switchgear And Protection by Shimroz123
2 answers 13 views
1 answer 21 views

Peterson coil is used for :  (A) shunt compensation of lines (B) grounding of system neutral (B) reduce fault currents (D) connecting interconnected systems

asked Apr 29, 2018 in Electrical Machine by Shimroz123
1 answer 26 views

A moving coil of meter has 100 turns, and a length and depth of 10mm and 20mm respectively. It is positioned in a uniform radial flux density of 200 mT. The coil carrier current capacity is 50 mA. The torque on the coil is

asked Apr 29, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 14 views

A Peterson coil is ________ A) An arc generating coil B) An arc suppressing coil C) An arc inducing coil D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 18 views

The self inductance of a coil can be measured using (A) Wien’s Bridge (B) Schering Bridge (C) Anderson’s Bridge (D) Wheatstone Bridge

asked Apr 28, 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 18 views

A moving coil meter has a resistance of 3 Ω and gives full scale deflection with 30 mA. To measure voltage up to 300 V, the external resistance to be connected in series with the instrument is (A) 9997 Ω (B) 10000 Ω (C) 997 Ω (D) 10003 Ω

asked Apr 28, 2018 in Power Electronic Controlled Drives by Shimroz123
1 answer 24 views

lt the length, number of turns and area of a coil are  doubled, the inductance of the coil

asked Apr 26, 2018 in Electrical Engineering 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
1 answer 47 views

The potential coil of a single phase dynamometer wattmeter has 4840 Ohm resistance. Voltage across the load is 220 V. With the potential coil connected on the load side, the meter indicates 100 W. Approximate percentage error due to wattmeter connection is (A) 11% (B) 9% (C) 1.1% (D) 3%

asked Apr 25, 2018 in Instrumentation and control by Shimroz123
1 answer 39 views

The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is_______Vs.

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 18 views

The rate of rise of current through an inductive coil is maximum?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 23 views

The inductance of a coil can be increased by?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 12 views

Inductance of coil?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 18 views

Inductance of a coil Varies?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 38 views

What is the difference between a coil and an inductor?

asked Dec 16, 2017 in Electrical Engineering by Quiz
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