Industrial Drivers MCQ

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• The capacity of a crane is expressed in terms of
  ক

  Type of drive

  খ

  Span

  গ

  Tonnes

  ঘ

  Any of the above
• The size of an excavator is usually expressed in terms of
  ক

  "Crowd" motion

  খ

  Angle of swing

  গ

  Cubic meters

  ঘ

  Travel in meters
• For a particular application the type of electric and control gear are determined by which of the following considerations?
  ক

  Starting torque

  খ

  Conditions of environment

  গ

  Limitation on starting current

  ঘ

  All of the above
• Which of the following motors always starts on load?
  ক

  Conveyor motor

  খ

  Floor mill motor

  গ

  Fan motor

  ঘ

  All of the above
• Which of the following alternatives will be cheaper?
  ক

  A 100 H.P. AC. three phase motor

  খ

  Four motors of 25 H.P. each

  গ

  Five motors of 20 H.P. each

  ঘ

  Ten motors of 10 H.P. each
• The cost of an induction motor will increase as
  ক

  Horsepower rating increases but r.p.m. decreases

  খ

  Horsepower rating decreases but r.p.m. increases

  গ

  Horsepower rating and operating speed increases

  ঘ

  Horsepower rating and operating speed decreases
• In squirrel cage induction motors which of the following methods of starting cannot be used?
  ক

  Resistance in rotor circuit

  খ

  Resistance in stator circuit

  গ

  Autotransformer starting

  ঘ

  Star-delta starting
• Battery operated scooter for braking uses
  ক

  Plugging

  খ

  Mechanical braking

  গ

  Regenerative braking

  ঘ

  Rheostatic braking
• In _________ method of staging three phase induction motors the starting voltage is not reduced.
  ক

  Autotransformer

  খ

  Star-delta

  গ

  Slip ring

  ঘ

  Any of the above
• Heat control switches are used in
  ক

  Transformers

  খ

  Cooling ranges

  গ

  Three phase induction motors

  ঘ

  Single phase
• For a motor-generator set which of the following motors will be preferred?
  ক

  Synchronous motor

  খ

  Slip ring induction motor

  গ

  Pole changing induction motor

  ঘ

  Squirrel cage induction motor
• For crane travel which of the following motors is normally used?
  ক

  Synchronous motor

  খ

  D.C. differentially compound motor

  গ

  Ward-Leonard controlled D.shunt motor

  ঘ

  AC. slip ring motor
• Which of the following motors is usually preferred for kiln drives?
  ক

  Cascade controlled A.C. motor

  খ

  Slip ring induction motor

  গ

  Three phase shunt wound commutator motor

  ঘ

  Any of the above
• In which of the following applications variable speed operation is preferred?
  ক

  Exhaust fan

  খ

  Ceiling fan

  গ

  Refrigerator

  ঘ

  Water pump
• Which of the following motors are best for the rolling mills?
  ক

  Single phase motors

  খ

  Squirrel cage induction motors

  গ

  Slip ring induction motors

  ঘ

  D.C. motors
• In ________ the speed can be varied by changing the position of brushes.
  ক

  Slip ring motor

  খ

  Schrage motor

  গ

  Induction motor

  ঘ

  Repulsion motor
• Is preferred for automatic drives.
  ক

  Squirrel cage induction motor

  খ

  Synchronous motors

  গ

  Ward Leonard controlled D.motors

  ঘ

  Any of the above
• __________ motor is a constant speed motor.
  ক

  Synchronous motor

  খ

  Schrage motor

  গ

  Induction motor

  ঘ

  Universal motor
• Besides a constant speed a synchronous rotor possesses which of the following advantages?
  ক

  Lower cost

  খ

  Better efficiency

  গ

  High power factor

  ঘ

  All of the above
• While selecting motor for an air conditioner which of the following characteristics is of great importance?
  ক

  Type of bearings

  খ

  Type of enclosure

  গ

  Noise

  ঘ

  Arrangement for power transmission
• Is preferred for synthetic fibre mills.
  ক

  Synchronous motor

  খ

  Reluctance motor

  গ

  Series motor

  ঘ

  Shunt motor
• In a paper mill where constant speed is required
  ক

  Synchronous motors are preferred

  খ

  A.C. motors are preferred

  গ

  Individual drive is preferred

  ঘ

  Group drive is preferred
• __________ method of starting a three phase induction motor needs six terminals.
  ক

  Star-delta

  খ

  Resistance starting

  গ

  Autotransformer

  ঘ

  None of the above
• Which of the following happens when star-delta starter is used?
  ক

  Starting voltage is reduced

  খ

  Starting current is reduced

  গ

  Both (A) and (B)

  ঘ

  None of the above
• For a D.C. shunt motor which of the following is incorrect?
  ক

  Unsuitable for heavy duty starting

  খ

  Torque varies as armature current

  গ

  Torque armature current is a straight line

  ঘ

  Torque is zero for zero armature current
• The starting torque in case of centrifugal pumps is generally
  ক

  Less than running torque

  খ

  Same as running torque

  গ

  Slightly more than running torque

  ঘ

  Double the running torque
• ________ has the least value of starting torque to full load torque ratio.
  ক

  D.C. shunt motor

  খ

  D.C. series motor

  গ

  Squirrel cage induction motor

  ঘ

  Slip ring induction motor
• A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is
  ক

  Slop speed operation

  খ

  High starting torque

  গ

  Low windage losses

  ঘ

  All of the above
• Which part of a motor needs maximum attention for maintenance?
  ক

  Frame

  খ

  Rearing

  গ

  Stator winding

  ঘ

  Rotor winding
• Which of the following motors has series characteristics?
  ক

  Shaded pole motor

  খ

  Repulsion motor

  গ

  Capacitor start motor

  ঘ

  None of the above