1
GATE EE 2004
+1
-0.3
For a given stepper motor, the following torque has the highest numerical value.
A
Detent torque
B
Pull-in torque
C
Pull-out torque
D
Holding torque
2
GATE EE 2004
+1
-0.3
The following motor definitely has a permanent magnet rotor
A
DC commutator motor
B
Brushless dc motor
C
Stepper motor
D
Reluctance motor
3
GATE EE 2004
+2
-0.6
Two $$3$$-phase, $$Y$$-connected alternators are to be paralleled to a set of common bus bars. The armature has a per phase synchronous reactance of $$1.7\Omega$$ and negligible armature resistance. The line voltage of the first machines is adjusted to $$3300$$ $$V$$ and that of the second machine is adjusted to $$3200$$ $$V.$$ the machine voltages are in phase at the instant they are paralleled. Under this condition, the synchronizing current per phase will be
A
$$16.98A$$
B
$$29.41A$$
C
$$33.96A$$
D
$$58.82A$$
4
GATE EE 2004
+2
-0.6
The synchronous speed for the seventh space harmonic $$mmf$$ wave of a $$3$$-phase, $$8$$ pole, $$50$$ $$Hz$$ induction machine is
A
$$107.14$$ rpm in forward direction
B
$$107.14$$ rpm in reverse direction
C
$$5250$$ rpm in forward direction
D
$$5250$$ rpm in reverse direction
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