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
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
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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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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