48.

49.

51.

92.

84.

55.

Farth tester is used for measuring earth resistance in which generated DC is converted into
AC by current reverser. The reason for using AC supply for resistance measurement is @

(ക) ۸ resistance is more than DC resistance
(B) To reduce error due to electrolytic e.m.f.
(@) AC wave form is pulsating in nature

(D) AC contains sine wave form

The basic function of voltage stabilizer is to provide :
(ಗಿ) Constant current supply to load (B) Constant power supply to load
(ற Constant voltage supply to load (D) Uninterrupted supply to load

A food mixture rated 240 प्र AC fails to start when it is switched on. Which one of the
following is NOT a cause for the above?

ശ്ര Jammed rotor (B) Supply voltage is only 7
{C) OL relay is not re-set (D) Open in armature winding

In a transformer the leakage flux may be minimized by :
(കു Minimizing the number of turns of both the winding
(ए) Sectionalizing and interleaving the primary and secondary winding
(0) Keeping the magnetizing current to the minimum
(D) Reducing the reluetance of the iron core to the minimum.

Which one of the following connections is preferred for three-to-two phase conversion?
(५) Scott (B} Double scott
(C) Star/star (D) Star/double — delta

The phase relationship between primary and secondary terminal voltage of a transformer 1s :
(A) Primary voltage is leading the secondary voltage by 905
(B) Secondary voltage is leading the primary voltage by 90°
)0 180 out of phase
(D) 10 {18 same phase

The no load primary current Io in an ideal transformer is :
(ಯ). In phase with Vi
(B) Leads Vi by 90%
)© Lage behind Vi by 90°
(D) Lags Vi by an angle lying between 0° and 90°

An bptocoupler is a single package ല്‌:
(வ LED and a signal diode (B) LED and a photodiode
(C) Two photodiodes (D) Two LEDs

9 035/2016
[P.T.0.]