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Electrical Engineering
Industrial Drivers
Quiz 3
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Q.1
Is not a part of ball bearing?
Inner race
Outer race
Cage
Bush
Q.2
Which of the following motors are preferred for overhead traveling cranes?
Slow speed motors
Continuous duty motors
Short time rated motors
None of the above
Q.3
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
D.C. motor
Q.4
For blowers which of the following motor is preferred?
D.C. series motor
D.C. shunt motor
Squirrel cage induction motor
Wound rotor induction motor
Q.5
For derris and winches which of the following drives can be used?
Pole changing squirrel cage motors
D.C. motors with Ward-Leonard control
A.C. slip ring motors with variable resistance
Any of the above
Q.6
Which of the following motors is preferred for traction work?
Universal motor
D.C. series motor
Synchronous motor
Three-phase induction motor
Q.7
Belted slip ring induction motor is almost invariably used for
Water pumps
Jaw crushers
Centrifugal blowers
None of the above
Q.8
The characteristics of drive for crane hoisting and lowering are which of the following?
Precise control
Smooth movement
Fast speed control
All of the above
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
________ need frequent starting and stopping of electric motors,
Paper mills
Grinding mills
Air-conditioners
Lifts and hoists
Q.11
The load cycle for a motor driving a power press will be
Variable load
Continuous
Continuous but periodical
Intermittent and variable load
Q.12
A reluctance motor
Is provided with slip rings
Requires starting gear
Has high cost
Is compact
Q.13
Heavy duty cranes are used in
Ore handling plants
Steel plants
Heavy engineering workshops
All of the above
Q.14
Which of the following motors is used for elevators?
Induction motor
Synchronous motor
Capacitor start single phase motor
Any of the above
Q.15
Light duty cranes are used in which of the following?
Power houses
Pumping stations
Automobile workshops
All of the above
Q.16
Reluctance motor is a
Variable torque motor
Low torque variable speed motor
Self starting type synchronous motor
Low noise, slow speed motor
Q.17
Flame proof motors are used in
Paper mills
Steel mills
Moist atmospheres
Explosive atmospheres
Q.18
The capacity of a crane is expressed in terms of
Type of drive
Span
Tonnes
Any of the above
Q.19
Battery operated scooter for braking uses
Plugging
Mechanical braking
Regenerative braking
Rheostatic braking
Q.20
Which of the following motors always starts on load?
Conveyor motor
Floor mill motor
Fan motor
All of the above
Q.21
Which of the following motors are preferred for overhead traveling cranes?
Slow speed motors
Continuous duty motors
Short time rated motors
None of the above
Q.22
Heat control switches are used in
Transformers
Cooling ranges
Three phase induction motors
Single phase
Q.23
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.24
The characteristics of drive for crane hoisting and lowering are which of the following?
Precise control
Smooth movement
Fast speed control
All of the above
Q.25
Belted slip ring induction motor is almost invariably used for
Water pumps
Jaw crushers
Centrifugal blowers
None of the above
Q.26
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.27
For crane travel which of the following motors is normally used?
Synchronous motor
differentially compound motor
Ward-Leonard controlled shunt motor
A slip ring motor
Q.28
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.29
Is not a part of ball bearing?
Inner race
Outer race
Cage
Bush
Q.30
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
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