Direction of rotation of a split phase motor can be reversed by reversing the connection of
both and
either or
running winding only
starting winding only
either or
A synchronous motor which works on a leading power factor and does not drive a mechanical load is called as
synchronous condenser
static condenser
condenser
none of the above
synchronous condenser
A synchronous motor develops maximum power when load angle is
120°
60°
45°
90°
90°
In a synchronous motor the breakdown torque is
directly proportional to the square of the applied voltage
inversely proportional to applied voltage
directly proportional to applied voltage
none of the above
directly proportional to applied voltage
The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor at rated stator supply voltage and frequency is known as
locked-rotor torque
reluctance torque
pull up torque
synchronous torque
locked-rotor torque
Exciters of synchronous machines are
d.c. shunt machines
d.c. compound machines
d.c. series machines
any of the above
d.c. shunt machines
The coupling angle or load angle of synchronous motor is defined as the angle between the
none of the above
rotor and the stator poles of opposite polarity
rotor and stator teeth
rotor and the stator poles of the same polarity
rotor and the stator poles of opposite polarity
The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as
pull-in torque
pull-up torque
pull-out torque
none of the above
pull-in torque
A synchronous machine with low value of short-circuit ratio has
good voltage regulation
good speed regulation
high stability limit
lower stability limit
lower stability limit
The construction of a synchronous motor resembles
a series motor
an induction motor
an alternator
a rotary converter
an alternator
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