Q.1
Is not a part of ball bearing?
Q.2
Which of the following motors are preferred for overhead traveling cranes?
Q.3
Which of the following motors is preferred when quick speed reversal is the main consideration?
Q.4
For blowers which of the following motor is preferred?
Q.5
For derris and winches which of the following drives can be used?
Q.6
Which of the following motors is preferred for traction work?
Q.7
Belted slip ring induction motor is almost invariably used for
Q.8
The characteristics of drive for crane hoisting and lowering are which of the following?
Q.9
The starting torque of a D.C. motor is independent of which of the following?
Q.10
________ need frequent starting and stopping of electric motors,
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
0 h : 0 m : 1 s