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Quiz 4
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Q.1
The size of an excavator is usually expressed in terms of
"Crowd" motion
Angle of swing
Cubic meters
Travel in meters
Q.2
Ward-Leonard controlled D.C. drives are generally used for _________ excavators.
Light duty
Medium duty
Heavy duty
All of the above
Q.3
________ need frequent starting and stopping of electric motors,
Paper mills
Grinding mills
Air-conditioners
Lifts and hoists
Q.4
While selecting an electric motor for a floor mill, which electrical characteristics will be of least significance?
Running characteristics
Starting characteristics
Efficiency
Braking
Q.5
When the load is above _________ a synchronous motor is found to be more economical.
2 kW
20 kW
50 kW
100 kW
Q.6
Which feature, while selecting a motor for centrifugal pump, will be of least significance?
Starting characteristics
Operating speed
Horse power
Speed control
Q.7
In jaw crushers a motor has to often start against ________ load.
Heavy
Medium
Normal
Low
Q.8
For which of the following applications D.C. motors are still preferred?
High efficiency operation
Reversibility
Variable speed drive
High starting torque
Q.9
The starting torque of a D.C. motor is independent of which of the following?
Flux
Armature current
Flux and armature current
Speed
Q.10
In _________ method of staging three phase induction motors the starting voltage is not reduced.
Autotransformer
Star-delta
Slip ring
Any of the above
Q.11
Has relatively wider range of speed control.
Synchronous motor
Ship ring induction motor
Squirrel cage induction motor
shunt motor
Q.12
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.13
By the use of which of the following D.C. can be obtained from AC.?
Silicon diodes
Mercury arc rectifier
Motor generator set
Any of the above
Q.14
In case of __________ speed control by injecting e.m.f. in the rotor circuit is possible,
shunt motor
Schrage motor
Synchronous motor
Slip ring induction motor
Q.15
In ________ the speed can be varied by changing the position of brushes.
Slip ring motor
Schrage motor
Induction motor
Repulsion motor
Q.16
Is preferred for automatic drives.
Squirrel cage induction motor
Synchronous motors
Ward Leonard controlled motors
Any of the above
Q.17
________ has the least value of starting torque to full load torque ratio.
shunt motor
series motor
Squirrel cage induction motor
Slip ring induction motor
Q.18
Rotor of a motor is usually supported on _________ bearings.
Ball or roller
Needle
Bush
Thrust
Q.19
A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is
Slop speed operation
High starting torque
Low windage losses
All of the above
Q.20
________ has least range of speed control.
Slip ring induction motor
Synchronous motor
shunt motor
Schrage 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
__________ method of starting a three phase induction motor needs six terminals.
Star-delta
Resistance starting
Autotransformer
None of the above
Q.24
Is preferred for synthetic fibre mills.
Synchronous motor
Reluctance motor
Series motor
Shunt motor
Q.25
__________ motor is a constant speed motor.
Synchronous motor
Schrage motor
Induction motor
Universal motor
Q.26
For blowers which of the following motor is preferred?
series motor
shunt motor
Squirrel cage induction motor
Wound rotor induction motor
Q.27
Which of the following motors is preferred when quick speed reversal is the main consideration?
Squirrel cage induction motor
Wound rotor induction motor
Synchronous motor
motor
Q.28
Which of the following motors is preferred for traction work?
Universal motor
series motor
Synchronous motor
Three-phase induction motor
Q.29
For derris and winches which of the following drives can be used?
Pole changing squirrel cage motors
motors with Ward-Leonard control
slip ring motors with variable resistance
Any of the above
Q.30
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
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