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The coil of a moving coil meter is would on An aluminium frame.

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The current coil of a single-phase energy meter is wound on (a) One limb of the laminated core (b) Both the limbs of the laminated core with same number of turns (c) Both the limbs of the laminated core with different number of turns (d) The centre of the limb on the laminated core

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A moving coil instrument of resistance 5 Ohm requires a potential difference of 75 mV to give a full scale deflection. The value of shunt resistance needed to give a full scale deflection at 30 A is

asked Apr 23, 2018 in Electrical Engineering by Shimroz123
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asked Apr 11, 2018 in Electrical Engineering by Shimroz123
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The magnetic field on the axis of a current carrying polygonal coil will have only a horizontal component parallel to the Plane of the coil 

asked May 24, 2018 in Electrical Engineering by Shimroz123
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asked Apr 29, 2018 in Electrical Engineering by Shimroz123
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asked May 26, 2018 in Electrical Measurements and Instrumentation by Shimroz123
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A permanent magnet moving coil ammeter has a coil resistance of 99 ohm and Full Scale Deflection (FSD) current of 0.1mA. Shunt resistance is 1 ohm. Current through the meter at 0.5 F.S.D is:

asked May 22, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 20 views

A moving coil instrument has a resistance of 10 W and gives full scale deflection when carrying a current of 50 mA. To measure current upto 100 A, we will have to connect • 10 W resistance in series • 10 W resistance in parallel • 10/1999 W resistance in series • 10/1999 W resistance in parallel

asked May 13, 2018 in Electrical Measurements and Instrumentation by Shimroz123
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What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage:  (A) Eddy Current and Hysteresis losses will be excessive  (B) Current will be too much high  (C) Transformer may start to smoke and burn  (D) No effect

asked May 8, 2018 in Electrical Engineering by Shimroz123
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Moving coil instruments have which one of the following scales ? (a) Logarithmic scale (b) Uniform scale (c) Non-uniform scale (d) Squared scale 

asked May 26, 2018 in Physics by Shimroz123
1 answer 14 views

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asked Apr 14, 2018 in Instrumentation and control by Shimroz123
1 answer 10 views

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asked Apr 10, 2018 in Instrumentation and control by Shimroz123
1 answer 16 views

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asked Mar 29, 2018 in Electrical engineering materials by Shimroz123
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The Q-meter works on the principle of  A) Mutual inductance B) Self inductance C) Series resonance D) Parallel resonance

asked Apr 9, 2018 in Electrical Engineering by Shimroz123
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Two voltmeters of same range, one moving iron type and other permanent magnet moving coil type, are connected in parallel for measuring a.c. supply voltage. If the reading of MI type is 300V, the reading of PMMC type will be (a) zero (b) higher-than M.I. type (c) lower than M.I. type (d) same

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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
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A Doppler Radar operating at 15 GHz is viewing a target moving directly towards it at the speed of 25 m/s. The Doppler frequency shift

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1 answer 7 views

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asked Apr 11, 2018 in Electrical Engineering by Shimroz123
1 answer 11 views

One single-phase energy meter operating on 230 V and 5 A for 5 hours makes 1940 revolutions. Meter constant is 400 rev/kWh. The power factor of the load is

asked Apr 23, 2018 in Electrical Engineering by Shimroz123
1 answer 56 views

What is the resistance of a coil which draws 10 A and dissipates 1520 W? A) 152 Ω B) 15.2 Ω C) 1.52 Ω D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 15 views

The current in a 200 mH coil increases from 2 to 5 A in 0.1 Second. What is rate of change of current? A. 30 A/s B. 20 A/s C. 10 A/s D. none of these

asked Apr 12, 2018 in Electrical Engineering by Shimroz123
1 answer 4 views

What is the value of Inductance of a coil that induces 20 V when the current through the coil changes from 12 to 20 A in 2 seconds? A. 2 H B. 3 H C. 4 H D. 5 H 

asked Apr 12, 2018 in Electrical Engineering by Shimroz123
1 answer 8 views

A two-phase generator is connected to two 90Ω load resistors. Each coil generates 120 V ac. The value of current flowing through the common neutral line will be: A. 1.33 A B. 1.88 A C. 2.66 A D. 1.77 A

asked Apr 12, 2018 in Electrical Engineering by Shimroz123
1 answer 20 views

A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will: A. increase B. decrease C. remain constant D. be excessive

asked Apr 12, 2018 in Electrical Engineering by Shimroz123
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What is the pitch factor of a 4 pole alternator having 36 slots and a coil span of 1 to 8?  (A) 140° (B) 80° (C) 20° (D) 40°

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
0 answers 30 views

A coil having 90 turns is connected to a 120 V, 60 Hz source. If the effective value of the magnetizing current is 4 A. Calculate the inductance of the coil.  (A) 79.6 mH (B) 121.2 mH (C) 32.2 mH (D) 83.16 mH

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
0 answers 15 views

 Which of the following motor would suit applications where constant speed is absolutely essential ? (A) Brushless dc motor (B) Disk motor (C) Permanent -magnet synchronous motor (D) Stepper motor

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
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