19.

20.

21.

22.

23,

24.

25,

26,

27.

A permanent magnel moving coil instrument will read :
{A) Only AC quantities (8) Both AC and DC quantities
{©} Only DC quantities (D) Pulsating quantities

What is the colour of neutral in single phase or three phase circuits ?
(ക) 800% (B} Blue (©) Yellow (D) ண

One lamp can be controlled from five locations by using intermediate switches and two way
switches. How many numbers of intermediate switches and two way switches are required
to control a lamp from 5 positions 7

(ക) Intermediate switches 2 and two way swilches 3
(B) Intermediate switches 4 and two way switches 1
)© Intermediate switches 1 and two way switches 4
(D) Intermediate switches 3 and two way switches 2

What will happen to the value of earth resistance if the length of the earth pipe is
increased ?

(A} 17೮೯೮೩5೮ {B) Decrease
(C) Remain same (D) None of the above

What is the SWG of copper earth conductor ‏لز‎ the maximum circuil current is 15 A ?
(ക) No. 14 (8) No.10 (೧) No.12 (D) No.8

What is the thickness of copper plate used for earth electrode ?
(ಯ) 63 mm (B) 3mm (C) 33 mm (0) 3.15 mm

What 15 the number of poles if the speed is 3000 RPM and frequency is 50 Hz of an
alternator ?

(है) 4 (8) 2 © 6 () 8

Alternators are rated in ்‌
ക KW (B) HP (ಲ) KVA (D) KVAR

What is the working principle of a two winding transformer ?
(ಗಿ) Self-induction (ए) Mutual induction
(C) Pringiple of DC motor (D) Lenz's Law

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