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Quiz 2
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Q.1
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.2
________ has the least value of starting torque to full load torque ratio.
D.C. shunt motor
D.C. series motor
Squirrel cage induction motor
Slip ring induction motor
Q.3
The starting torque in case of centrifugal pumps is generally
Less than running torque
Same as running torque
Slightly more than running torque
Double the running torque
Q.4
In which of the following applications the load on motor changes in cyclic order?
Electric shovels
Cranes
Rolling mills
All of the above
Q.5
For which of the following applications motor has to start with high acceleration?
Oil expeller
Floor mill
Lifts and hoists
Centrifugal pump
Q.6
Flame proof motors are used in
Paper mills
Steel mills
Moist atmospheres
Explosive atmospheres
Q.7
Which of the following machines has heavy fluctuation of load?
Printing machine
Punching machine
Planer
Lathe
Q.8
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.9
Which of the following is essentially needed while selecting a motor?
Pulley
Starter
Foundation pedal
Bearings
Q.10
Is preferred for synthetic fibre mills.
Synchronous motor
Reluctance motor
Series motor
Shunt motor
Q.11
A pony motor is used for the starting which of the following motors?
Squirrel cage induction motor
Schrage motor
Synchronous motor
None of the above
Q.12
In series motor which of the following methods can be used for changing the flux per pole?
Tapped field control
Diverter field control
Series-parallel control
Any of the above
Q.13
Short time rated motors are preferred for overhead traveling cranes
True
False
Q.14
Reluctance motor is a
Variable torque motor
Low torque variable speed motor
Self starting type synchronous motor
Low noise, slow speed motor
Q.15
Light duty cranes are used in which of the following?
Power houses
Pumping stations
Automobile workshops
All of the above
Q.16
The diameter of the rotor shaft for an electric motor depends on which of the following?
r.p.m. only
Horse power only
Horse power and r.p.m.
Horse power, r.p.m. and power factor
Q.17
The load cycle for a motor driving a power press will be
Variable load
Continuous
Continuous but periodical
Intermittent and variable load
Q.18
Which of the following motors is used for elevators?
Induction motor
Synchronous motor
Capacitor start single phase motor
Any of the above
Q.19
Which of the following types of motor enclosure is safest?
Totally enclosed
Totally enclosed fan cooled
Open type
Semi closed
Q.20
In case of __________ speed control by injecting e.m.f. in the rotor circuit is possible,
D.C. shunt motor
Schrage motor
Synchronous motor
Slip ring induction motor
Q.21
Which of the following motors is preferred when smooth and precise speed control over a wide range is desired?
D.C. motor
Squirrel cage induction motor
Wound rotor induction motor
Synchronous motor
Q.22
The selection of an electric motor for any application depends on which of the following factors?
Electrical characteristics
Mechanical characteristics
Size and rating of motors
All of the above
Q.23
Ward-Leonard controlled D.C. drives are generally used for _________ excavators.
Light duty
Medium duty
Heavy duty
All of the above
Q.24
A reluctance motor
Is provided with slip rings
Requires starting gear
Has high cost
Is compact
Q.25
Which feature, while selecting a motor for centrifugal pump, will be of least significance?
Starting characteristics
Operating speed
Horse power
Speed control
Q.26
While selecting an electric motor for a floor mill, which electrical characteristics will be of least significance?
Efficiency
Running characteristics
Starting characteristics
Braking
Q.27
Rotor of a motor is usually supported on _________ bearings.
Ball or roller
Needle
Bush
Thrust
Q.28
When the load is above _________ a synchronous motor is found to be more economical.
2 kW
20 kW
50 kW
100 kW
Q.29
In jaw crushers a motor has to often start against ________ load.
Heavy
Medium
Normal
Low
Q.30
For which of the following applications D.C. motors are still preferred?
High efficiency operation
Reversibility
Variable speed drive
High starting torque
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