Q-1:-Choose the right answer: 1. The Stator of a 3-phase induction motor produces - magnetic field. (a) Steady 2. The air gap between stator and rotor of a 3-phase induction motor ranges from (a) 2 cm to 4 cm (d) 3 cm to 6 cm. (b) rotating (c) ramping (d) alternating. (b) 0.4mm to 4 mm (c) 1 cm to 3 cm 3. The relation between synchronous speed (Ns) and rotor speed (Nm) and slip is: (b) Nm= (1-s) Ns (c) Nm- (2-s) Ns (d) Nm-s Ns (a) Nm-(s-1) Ns

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Q-1:- Choose the right answer:
1. The Stator of a 3-phase induction motor produces -
(a) Steady
--magnetic field.
(d) alternating.
(b) rotating
(c) ramping
2. The air gap between stator and rotor of a 3-phase induction motor ranges from
(b) 0.4mm to 4 mm
(a) 2 cm to 4 cm
(c) 1 cm to 3 cm
(d) 3 cm to 6 cm.
3. The relation between synchronous speed (Ns) and rotor speed (Nm) and slip is:
(a) Nm-(s-1) Ns
(b) Nm- (1-s) Ns (c) Nm- (2-s) Ns (d) Nm- s Ns
4. When a 3-phase induction motor is at no load, the slip is --
(a) 1
5. When the rotor of a 3-phase induction motor is blocked, the slip is-
(b) 0.4 (c) 0
(d) 0.5
(a) 0
(b) 0.5 (c) 0.1 (d) 1
3-phase
supply 50 Hz
6.
P=4
L.M
When the motor at standstill, the rotor frequency is -
7. The resistance representing the mechanical load in the equivalent circuit of a three phase
induction motor is given by:
(a) R2(1- (b)R:(S – 1) (c) R2-1) (d) R2S
(7 Marks)
Transcribed Image Text:Q-1:- Choose the right answer: 1. The Stator of a 3-phase induction motor produces - (a) Steady --magnetic field. (d) alternating. (b) rotating (c) ramping 2. The air gap between stator and rotor of a 3-phase induction motor ranges from (b) 0.4mm to 4 mm (a) 2 cm to 4 cm (c) 1 cm to 3 cm (d) 3 cm to 6 cm. 3. The relation between synchronous speed (Ns) and rotor speed (Nm) and slip is: (a) Nm-(s-1) Ns (b) Nm- (1-s) Ns (c) Nm- (2-s) Ns (d) Nm- s Ns 4. When a 3-phase induction motor is at no load, the slip is -- (a) 1 5. When the rotor of a 3-phase induction motor is blocked, the slip is- (b) 0.4 (c) 0 (d) 0.5 (a) 0 (b) 0.5 (c) 0.1 (d) 1 3-phase supply 50 Hz 6. P=4 L.M When the motor at standstill, the rotor frequency is - 7. The resistance representing the mechanical load in the equivalent circuit of a three phase induction motor is given by: (a) R2(1- (b)R:(S – 1) (c) R2-1) (d) R2S (7 Marks)
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