37.

38,

39,

40.

41.

42,

43,

44.

45,

The transformer connection used at the substation end of the transmission line is
(ಹಿ) Star - Star (B) Delta-Delta (C) Delta - Star (D) Star - Delta

The essential condition for the parallel operation of two single phase transformers should be

(ಹ) The same voltage ratio (8) The same polarity
(C) The same phase sequence (D) Both (B) and (C)

The method of speed control of series motor used in electric trains is
(ಹಿ) Field tapping method (B) Field diverter method
(C) Series parallel method (D) Voltage control method

The dc generator used for arc welding process is
(ಹ) Cummulatively compound (8) ங்க wound
(ಲ) Under compound (D) Differentially compound

An electric current of 10 A is divided into two branches of resistance 2 Q and 3 Q respectively.
The branch current in 3 Q resistance 15 A,

^) 4 ൫ 6 © 3 യു 2

A 3¢ induction motor is wound for 4 poles, the synchronous speed of the motor supplied
from a 50 Hz system is 50.

(മ) 1440 ൫ 1500 © 1400 (D) 1600

Armature torque produced in a dc series motor is proportional to
(ಹ) The field current (8) The armature current
(C) The square of the armature current (D) None of these

During charging of a lead acid cell, the specific gravity of the electrolyte is ۶
(^) Decreases (8) Increases (C) Doesnot change (D) None of these

The power consumption of purely capacitive circuit is 2
(ಹ) ‏مع‎ (8) पणा (ಲ) less than unity (D) greater than unity

7 020/2018
{P.T.O}