47.

48.

49.

50.

V1109

c) Back emf of d)
these motors is
high initially

b) These motors
are not self
starting

a) These motors have
low starting torque

Identify the circuit element that stores energy in the electromagnetic field

a) Inductance b) Condenser €) Variable resistor 0)

Magnetising impedance of a transformer is determined by

a) SC Test b) OC Test €) Both(a)and(b) ५)

Satisfactory operation of three phase transformers in parallel requires

a) Same voltage
rating, polarity,
phase sequence,
percentage
impedance and
vector group

The purpose of providing dummy coil in 0൦ generator is

b) Same voltage
rating,
frequency and
vector group

c) Same voltage d)
rating, polarity,
frequency and
percentage
impedance

b) To reduce Eddy
current loss

c) Toreduce d)
Hysteresis loss

a) For mechanical
Balance

RE

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To restrict the
armature
current at
starting

resistance

Load Test

Same voltage
rating, frequency
and percentage
impedance

To increase
efficiency of
generator