51.

52,

53,

54.

55,

56.

57.

58.

The rotor of the salient pole alternator has 24 poles. The number of cycles of emf in one
revolution would be :

(A) 24 ஐ 12 © 6 D) 4

The synchronous motors are not self-starting because :

(ಗಿ) Statoris not used

(B) Starting winding is not provided

{©} 178 direction of instantaneous torque on the rotor reverses after haif cycle
(2) There is no slip

1 Tesla is the same as one :
(ಗ) weber/metre (0) Weber/ (rne‘:re]2 (C) Farad/metre (D) ரணை (metre)?

Load shading is done :
(ಹಿ) To reduce heat demand (18) To improve power factor
(C) To run the equipment efficiency (D) 70 repair the machine

Circular coil sections are used because they :
(A) Reduce iron malerial (8) Reduce copper material
(©) Have the strongest mechanical shape (D) All of these

Transient disturbances are due to :
(A) Switching operations (8) Load variations
(ಲ) யடி (D) Any of the above

The core flux in a transformer depends mainly on :

(ക) Supply voltage

(8) Supply voltage and frequency

(©) Supply voltage, frequency and load

(0) Supply voltage and load independent of frequency

Ohm's law (E=IR)

(A) Can never be applied to a.c.

(8) (ग be applied to a.c. in the same manner as to d.c.
{©} Can be applied to a.c. but after replacing R by Z
(D) None of the above

9 154/2014
P.T.0.}