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Quiz 1
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Q.1
Heat control switches are used in
Transformers
Cooling ranges
Three phase induction motors
Single phase
Q.2
In _________ method of staging three phase induction motors the starting voltage is not reduced.
Autotransformer
Star-delta
Slip ring
Any of the above
Q.3
Battery operated scooter for braking uses
Plugging
Mechanical braking
Regenerative braking
Rheostatic braking
Q.4
In squirrel cage induction motors which of the following methods of starting cannot be used?
Resistance in rotor circuit
Resistance in stator circuit
Autotransformer starting
Star-delta starting
Q.5
The cost of an induction motor will increase as
Horsepower rating increases but r.p.m. decreases
Horsepower rating decreases but r.p.m. increases
Horsepower rating and operating speed increases
Horsepower rating and operating speed decreases
Q.6
Which of the following alternatives will be cheaper?
A 100 H.P. AC. three phase motor
Four motors of 25 H.P. each
Five motors of 20 H.P. each
Ten motors of 10 H.P. each
Q.7
Which of the following motors always starts on load?
Conveyor motor
Floor mill motor
Fan motor
All of the above
Q.8
For a particular application the type of electric and control gear are determined by which of the following considerations?
Starting torque
Conditions of environment
Limitation on starting current
All of the above
Q.9
The size of an excavator is usually expressed in terms of
"Crowd" motion
Angle of swing
Cubic meters
Travel in meters
Q.10
While selecting motor for an air conditioner which of the following characteristics is of great importance?
Type of bearings
Type of enclosure
Noise
Arrangement for power transmission
Q.11
Besides a constant speed a synchronous rotor possesses which of the following advantages?
Lower cost
Better efficiency
High power factor
All of the above
Q.12
Which of the following motors are best for the rolling mills?
Single phase motors
Squirrel cage induction motors
Slip ring induction motors
D.C. motors
Q.13
In which of the following applications variable speed operation is preferred?
Exhaust fan
Ceiling fan
Refrigerator
Water pump
Q.14
The capacity of a crane is expressed in terms of
Type of drive
Span
Tonnes
Any of the above
Q.15
__________ motor is a constant speed motor.
Synchronous motor
Schrage motor
Induction motor
Universal motor
Q.16
Is preferred for automatic drives.
Squirrel cage induction motor
Synchronous motors
Ward Leonard controlled D.C. motors
Any of the above
Q.17
Which of the following motors is usually preferred for kiln drives?
Cascade controlled A.C. motor
Slip ring induction motor
Three phase shunt wound commutator motor
Any of the above
Q.18
For crane travel which of the following motors is normally used?
Synchronous motor
D.C. differentially compound motor
Ward-Leonard controlled D.C. shunt motor
AC. slip ring motor
Q.19
In ________ the speed can be varied by changing the position of brushes.
Slip ring motor
Schrage motor
Induction motor
Repulsion motor
Q.20
For a motor-generator set which of the following motors will be preferred?
Synchronous motor
Slip ring induction motor
Pole changing induction motor
Squirrel cage induction motor
Q.21
For a D.C. shunt motor which of the following is incorrect?
Unsuitable for heavy duty starting
Torque varies as armature current
Torque armature current is a straight line
Torque is zero for zero armature current
Q.22
Which of the following happens when star-delta starter is used?
Starting voltage is reduced
Starting current is reduced
Both (A) and (B)
None of the above
Q.23
Which of the following motors has series characteristics?
Shaded pole motor
Repulsion motor
Capacitor start motor
None of the above
Q.24
Which part of a motor needs maximum attention for maintenance?
Frame
Rearing
Stator winding
Rotor winding
Q.25
Has relatively wider range of speed control.
Synchronous motor
Ship ring induction motor
Squirrel cage induction motor
D.C. shunt motor
Q.26
________ has least range of speed control.
Slip ring induction motor
Synchronous motor
D.C. shunt motor
Schrage motor
Q.27
Which of the following motors is preferred for boom hoist of a traveling crane?
Single phase motor
Synchronous motor
A.C. slip ring motor
Ward-Leonard controlled D.C. shunt motor
Q.28
The traveling speed of cranes varies from
20 to 30 m/s
10 to 15 m/s
5 to 10 m/s
1 to 2.5 m/s
Q.29
__________ method of starting a three phase induction motor needs six terminals.
Star-delta
Resistance starting
Autotransformer
None of the above
Q.30
In a paper mill where constant speed is required
Synchronous motors are preferred
A.C. motors are preferred
Individual drive is preferred
Group drive is preferred
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