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The purpose of providing dummy coils in a generator is to provide mechanical balance for the rotor.

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From which material field coils of DC generator are made of?

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The purpose of providing dummy coils in dc machine armature is to  (1) reduce eddy currents (2) increase voltage induced (3) decrease armature resistance (4) provide mechanical balance for the motor

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A dummy strain gage is used in a quarter bridge strain gage circuit to :  (A) compensate for changes in temperature and lead wire resistance  (B) produce more output voltage from the bridge  (C) increase the sensitivity of the bridge  (D) compensate lead wire resistance only

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The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be?

asked Mar 21, 2018 in DC generator by Shimroz123
1 answer 17 views

For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f. ?

asked Mar 20, 2018 in DC generator by Shimroz123
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A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly?

asked Mar 21, 2018 in DC generator by Shimroz123
1 answer 14 views
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The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is :  (A) 256 W (B) 320 W (C) 500 W (D) 625 W

asked Apr 30, 2018 in Switchgear And Protection by Shimroz123
1 answer 16 views
2 answers 34 views

The fall in speed of a dc generator due to increase in load can be corrected by  (1) cooling the armature.. (2) increasing the excitation. (3) reducing the load voltage. (4) increasing the input to the prime mover

asked May 1, 2018 in Electrical Machine by Shimroz123
1 answer 18 views

In a DC generator the windings of interpoles are connected :  (A) in series with main field winding, to create a pole,of same polarity as the main pole ahead in the direction of rotation.  (B) in series with main field winding, to create a pole of opposite polarity as the main pole ahead in the direction of ... in the direction of rotation.  (D) in series with the armature winding, to create a pole of opposite polarity as the main pole ahead in the direction of rotation.

asked Apr 29, 2018 in Electrical Machine by Shimroz123
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The armature reaction in a synchronous generator supplying leading power factor load is (A) magnetizing (B) demagnetizing (C) demagnetizing and cross-magnetizing (D) magnetizing and cross-magnetizing

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 18 views

What is the choice of size and number of generator units in interconnected power system?

asked Sep 7, 2018 by Shimroz123
1 answer 26 views

A _________ is used to measure the stator % winding temperature of the generator.  (A) Thermocouple (B) Pyrometer (C) Resistance thermometer (D) Thermometer

asked May 8, 2018 in Electrical Machine by Shimroz123
1 answer 23 views

The terminal characteristics of a dc generator suitable for electric welders is (A) separately excited generator (B) shunt generator (C) series generator (D) differentially compounded generator

asked Apr 28, 2018 in Electrical Engineering by Shimroz123

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