Q.1
Heat control switches are used in
Q.2
In _________ method of staging three phase induction motors the starting voltage is not reduced.
Q.3
Battery operated scooter for braking uses
Q.4
In squirrel cage induction motors which of the following methods of starting cannot be used?
Q.5
The cost of an induction motor will increase as
Q.6
Which of the following alternatives will be cheaper?
Q.7
Which of the following motors always starts on load?
Q.8
For a particular application the type of electric and control gear are determined by which of the following considerations?
Q.9
The size of an excavator is usually expressed in terms of
Q.10
While selecting motor for an air conditioner which of the following characteristics is of great importance?
Q.11
Besides a constant speed a synchronous rotor possesses which of the following advantages?
Q.12
Which of the following motors are best for the rolling mills?
Q.13
In which of the following applications variable speed operation is preferred?
Q.14
The capacity of a crane is expressed in terms of
Q.15
__________ motor is a constant speed motor.
Q.16
Is preferred for automatic drives.
Q.17
Which of the following motors is usually preferred for kiln drives?
Q.18
For crane travel which of the following motors is normally used?
Q.19
In ________ the speed can be varied by changing the position of brushes.
Q.20
For a motor-generator set which of the following motors will be preferred?
Q.21
For a D.C. shunt motor which of the following is incorrect?
Q.22
Which of the following happens when star-delta starter is used?
Q.23
Which of the following motors has series characteristics?
Q.24
Which part of a motor needs maximum attention for maintenance?
Q.25
Has relatively wider range of speed control.
Q.26
________ has least range of speed control.
Q.27
Which of the following motors is preferred for boom hoist of a traveling crane?
Q.28
The traveling speed of cranes varies from
Q.29
__________ method of starting a three phase induction motor needs six terminals.
Q.30
In a paper mill where constant speed is required
0 h : 0 m : 1 s