17.

18.

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21.

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24,

Damper windings are provided in synchronous machines [0 :
(^) Damp out rotor oscillations

(18) Reduce the over voltages under abnormal conditions
{C) Facilitate starting

(D) All of the above

The speed of a d.c. motor is ;

(A) Always constant

(8) Directly proportional to back e.m.f

(C) Directly proportional to flux

(D) Inversely proportional to the product of back e.m.f and flux

Which test can be used to determine the no load losses of a shunt motor ?
(A) Retardation test (8) Hopkinson's test
(9) Swinburne’s test (D) Brake test

Select the wrong statement from below, which is the essential condition for parallel
operation of two or more transformers.

(A) Current ratios should be same (B) Voltage ratios should be same
(9 Polarity should be same (D) Phase sequence should be same

Distribution transfarmers are usually designed to have maximum efficiency :
(A) Near full load (8) Near 75% of full load
(೮) Near 50% of full load (D) Near no load

The major disadvantage, with solar cells for power generation is :
(வ) Lack of availability of sunlight (18) Large area requirement
(C) Variable power (0) High cost

The type of d.c. generator used for are welding purposes is :
(ಕಿ) Cumulatively compounded generator

(8) Shunt generator

{C) Series generator

(D) Differentially compounded generator

Class H insulation is normally used in :

(ಗೈ) Traction motors (B) Submersible pump mators
(C) Single phase motars (ಐ) d.e. motors
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