27.

28.

29.

30.

31.

92.

33.

34.

What is the formula to find 3 phase Reactive power (Pr) if the line voltage is ‘V;’ and line
current is 77?

(A) ए" = «8 ए 1}, Sind ൯ ए" = «8 1 1 Cos0
(0 Pr=3V; 1 000 (D) Pr= ಉ 1 Sino

What is the main cause for below 0.5 lagging power factor in 3 phase system?
(ಹ) Fluctuation of voltage
(B) Reactive power due to more inductive load
(C) Reactive power due to more capacitive load

(1) True power due to resistive load

A 3-phase, 4 wire, 230/415 volt system is supplying lamp load at 230 volt. If a 3-phase motor
is now switched ON across the same supply, then :

(A) neutral current will increase ൯) whole line current will decrease

(C) neutral current remain unchanged 0 power factor will be improved

For plate earthing, plate electrodes thickness when made of G.I or steel should not be less
than :

(A) 1.3mm (B) 2.15 mm
(C) 6.3mm ൯൩) 3.15 पा

According to IE rule the leakage current in an installation should not exceed one
th part of the maximum current supplied to the installation.

(A) 500 (B) 100
(C) 5000 (D) 1000

The size of the earth continuity conductor in a circuit should be based up on the :
(4) Voltage of the system (B) Size of largest service conductor

(C) Size of smallest service conductor (D) Leakage current in the system

n surface conduit wiring, saddles should be fitted at intervals of not more than
meter.

(A) 0.5 ൫ 1.5
(0 0.75 त) 1

n batten wiring, Link clips will have two holes for :
(A) 50mm (B) 40mm
(C) 30mm ൯൩) 20mm

121/2021 6 A