100 Important Industrial Drives MCQ Question & Answer | PDF Free Download
1.Which of the following machines has heavy fluctuation of load?
- APrinting machine
- BPunching machine
- CPlaner
- DLathe
2.For derries and winches which of the following drives can be used?
- APole changing squirrel cage motors
- BDC motors with Ward-leonard control
- CAC slip ring motors with variable resistance
- DAny of the above
3.Battery operated scooter for braking uses
- APlugging
- BMechanical braking
- CRegenerative braking
- DRheostatic braking
4.___________ has least range of speed control.
- ASlip ring induction motor
- BSynchronous motor
- CDC shunt motor
- DSchrage motor
5._____________ has the least value of starting torque to full load torque ratio.
- ADC shunt motor
- BDC series motor
- CSquirrel cage induction motor
- DSlip ring induction motor
6.In case of ____________ speed control by injecting e.m.f. in the rotor circuit is possible.
- ADC shunt motor
- BSchrage motor
- CSynchronous motor
- DSlip ring induction motor
7.A pony motor is used for the starting which of the following motors?
- ASquirrel cage induction motor
- BSchrage motor
- CSynchronous motor
- DNone of the above
8.In ____________ the speed can be varied by changing the position of brushes.
- ASlip ring motor
- BSchrage motor
- CInduction motor
- DRepulsion motor
9.In which of the following applications variable speed operation is preferred?
- AExhaust fan
- BCeiling fan
- CRefrigerator
- DWater pump
10.Heavy duty cranes are used in
- AOre handling plants
- BSteel plants
- CHeavy engineering workshops
- DAll of the above
11.The travelling speed of cranes varies from
- A20 to 30 m/s
- B10 to 15 m/s
- C5 to 10 m/s
- D1 to 2.5 m/s
12.Besides a constant speed a synchronous rotor possesses which of the following advantages?
- ALower cost
- BBetter efficiency
- CHigh power factor
- DAll of the above
13.By the use of which of the following DC can be obtained from AC?
- ASilicon diodes
- BMercury arc rectifier
- CMotor generator set
- DAny of the above
14.Which of the following motors is preferred when quick speed reversal is the main consideration?
- ASquirrel cage induction motor
- BWound rotor induction motor
- CSynchronous motor
- DDC motor
15.Which of the following motors is preferred when smooth and precise speed control over a wide range is desired?
- ADC motor
- BSquirrel cage induction motor
- CWound rotor induction motor
- DSynchronous motor
16.For crane travel which of the following motors is normally used?
- ASynchronous motor
- BDC differentially compound motor
- CWard-Leonard controlled DC shunt motor
- DAC slip ring motor
17.The capacity of a crane is expressed in terms of
- AType of drive
- BSpan
- CTonnes
- DAny of the above
18.The characteristics of drive for crane hoisting and lowering are which of the following?
- APrecise control
- BSmooth movement
- CFast speed control
- DAll of the above
19.Which of the following motors is preferred for boom hoist of a travelling crane?
- ASingle phase motor
- BSynchronous motor
- CAC slip ring motor
- DWard-Leonard controlled DC shunt motor
20.A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is
- ASlop speed operation
- BHigh starting torque
- CLow windage losses
- DAll of the above