Q1. Choose the correct answer:1- The disadvantage of starting an induction motor with a star-delta starter is.(a) the starting torque is one-third of the torque in case of delta connection(b) during starting high losses result (c) the starting torque increases and the motor runs withvibration (d) the starting current is high2- In the 3-phase induction motor, the resultant flux of rotating magnetic field is equal to.(a) the maximum value of flux due to any phase(b) 3/2 times maximum value of flux due to any phase(c) 1/2 times maximum value of flux due to any phase(d) 3 times maximum value of flux due to any phase3- If an induction machine is run at speed above the synchronous speed it works inof torque-speed characteristic.(a) induction generator (b) induction motor (c) brake (d) unstable4- The rotor slots are slightly skewed in squirrel cage induction motor to ..............(a) provide ease of fabrication(c) increase the strength of rotor bars5- Crawling in an induction motor is caused by***********........ region(b) reduce the magnetic hum and locking tendency of rotor(d) decrease the amount of copper to be used(d) overheating(a) harmonics (b) low voltage (c) high voltage6- In the 3-phase induction motor, the external type of braking is(a) DC braking (b) plugging (c) mechanical braking (d) AC braking7- The highest starting torque in three phase squirrel cagetype NEMA(a) Design A(b) Design B8- The speed control method type(a) pole changing(d) variable frequency variable voltage control9- The iron losses is represented in the equivalent circuit of three-phase induction motor by(c) Rc (d) RL(a) R1(b) R2***********10-If supply voltage of a 3-phase induction motor is increased 2 times, then torque is(a) increased 2 times (b) decreased 2 times (c) increased 4 times (d) decreased 4 timesinduction motor is found in motor(c) Design C (d) Design D-------------- cannot be applied on wound rotor induction motor.(c) rotor resistance controf(b) stator voltage control-********

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Q1. Choose the correct answer: 1- The disadvantage of starting an induction motor with a star-delta starter is (a) the starting torque is one-third of the torque in case of delta connection (b) during starting high losses result (c) the starting torque increases and the motor runs with vibration (d) the starting current is high

Q1. Choose the correct answer: 1- The disadvantage of starting an induction motor with a star-delta starter is (a) the starting torque is one-third of the torque in case of delta connection (b) during starting high losses result (c) the starting torque increases and the motor runs with vibration (d) the starting current is high

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Concept explainers

Single Phase Induction Motor

The single-phase induction motor or engine consists of a single rotating phase in the stator and a rotating cage in the rotor. When phase one supply is connected to the stator winding, a magnetic field is generated. In the pulsating field, the rotor does not rotate due to inertia. So, a single-phase import motor does not start and requires some initial methods.

Question

Q1. Choose the correct answer:
1- The disadvantage of starting an induction motor with a star-delta starter is.
(a) the starting torque is one-third of the torque in case of delta connection
(b) during starting high losses result (c) the starting torque increases and the motor runs with
vibration (d) the starting current is high
2- In the 3-phase induction motor, the resultant flux of rotating magnetic field is equal to.
(a) the maximum value of flux due to any phase
(b) 3/2 times maximum value of flux due to any phase
(c) 1/2 times maximum value of flux due to any phase
(d) 3 times maximum value of flux due to any phase
3- If an induction machine is run at speed above the synchronous speed it works in
of torque-speed characteristic.
(a) induction generator (b) induction motor (c) brake (d) unstable
4- The rotor slots are slightly skewed in squirrel cage induction motor to ..............
(a) provide ease of fabrication
(c) increase the strength of rotor bars
5- Crawling in an induction motor is caused by
***********
........ region
(b) reduce the magnetic hum and locking tendency of rotor
(d) decrease the amount of copper to be used
(d) overheating
(a) harmonics (b) low voltage (c) high voltage
6- In the 3-phase induction motor, the external type of braking is
(a) DC braking (b) plugging (c) mechanical braking (d) AC braking
7- The highest starting torque in three phase squirrel cage
type NEMA
(a) Design A
(b) Design B
8- The speed control method type
(a) pole changing
(d) variable frequency variable voltage control
9- The iron losses is represented in the equivalent circuit of three-phase induction motor by
(c) Rc (d) RL
(a) R1
(b) R2
***********
10-If supply voltage of a 3-phase induction motor is increased 2 times, then torque is
(a) increased 2 times (b) decreased 2 times (c) increased 4 times (d) decreased 4 times
induction motor is found in motor
(c) Design C (d) Design D
-------------- cannot be applied on wound rotor induction motor.
(c) rotor resistance controf
(b) stator voltage control-
********

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