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Recent questions tagged motors

1 answer 53 views

A relay used for protection of motors against overload is :  (A) Impedance relay (B) Electromagnetic attraction type (C) Thermal relay (D) Buchholz's relay

asked May 8, 2018 in Switchgear And Protection by Shimroz123
1 answer 30 views

Damper winding is provided in 3 phase synchronous motors to :

asked Apr 29, 2018 in Electrical Machine by Shimroz123
1 answer 10 views

Stepper motors are used in  (1) printers (2) lifts (3) amplifiers (4) oscillators

asked Apr 29, 2018 in Electrical Machine by Shimroz123
1 answer 27 views

Which of the following motors can run on both AC and DC? A) Universal motor B) Dual wattage motor C) Flexible motor D) All the above

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 19 views

Slot harmonics are reduced in induction motors by using (A) fractional-pitch windings (B) fractional-slot windings (C) integral-slot windings (D) distributed windings

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 19 views

Generally, Crawling in squirrel cage induction motors is tendency to run stably at speeds as low as (A) One-third of their synchronous speed (B) One-fifth of their synchronous speed (C) One-seventh of their synchronous speed (D) One-ninth of their synchronous speed

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 41 views

Which of the following test is usually conducted to determine the efficiency of traction motors ? (A) Field’s test (B) Swinburne’s test (C) Hopkinson’s test (D) Retardation test.

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 57 views

Which of the following motors is being extensively used in servo applications ? A. AC motor B. Field controlled dc motor C. Armature controlled dc motor D. None of these

asked Apr 26, 2018 in Electrical Machine by Shimroz123
2 answers 27 views

The efficiencies of transformers compared with that of electric motors of the same power are?

asked Mar 19, 2018 in Transformer by Shimroz123
0 answers 19 views

What are the five types of single phase motors used in the industry?

asked Mar 15, 2018 in Electrical Machine by Quiz
1 answer 53 views

What is the difference between synchronous and asynchronous motors?

asked Mar 15, 2018 in Electrical Machine by Quiz
0 answers 12 views

Do AC induction motors have back EMF?

asked Mar 15, 2018 in Electrical Engineering by Quiz
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