100 Important Industrial Drives MCQ Question & Answer | PDF Free Download
1.The selection of an electric motor for any application depends on which of the following factors?
- AElectrical characteristics
- BMechanical characteristics & Cost
- CSize and rating of motors
- DAll of the above
2.For a particular application the type of electric and control gear are determined by which of the following considerations?
- AStarting torque
- BLimitation on starting current
- CSpeed control range and its nature
- DAll of the above
3.Which of the following motors is preferred for traction work?
- AUniversal motor
- BDC series motor
- CSynchronous motor
- D3-phase induction motor
4.Which of the following motors always starts on load?
- AConveyor motor
- BFloor mill motor
- CFan motor
- DAll of the above
5._____________ is preferred for automatic drives.
- ASquirrel cage induction motor
- BSynchronous motor
- CWard-Leonard controlled DC motors
- DAny of the above
6.When the load is above ____________ a Synchronous motor is found to be more economical.
- A2 kW
- B20 kW
- C50 kW
- D100 kW
7.The load cycle for a motor driving a power press will be ___________
- AVariable load
- BContinuous
- CContinuous but periodica
- DIntermittent and variable load
8.Light duty cranes are used in which of the following?
- APower houses
- BPumping station
- CAutomobile workshops
- DAll of the above
9.While selecting an electric motor for a floor mill, which electrical characteristics will be of least significance?
- ARunning characteristics
- BStarting characteristics
- CEfficiency
- DBraking
10.Which of the following motors are preferred for overhead travelling cranes?
- ASlow speed motors
- BContinuous duty motors
- CShort time rated motors
- DNone of the above
11.___________ is preferred for synthetic fibre mills.
- ASynchronous motor
- BReluctance motor
- CSeries motor
- DShunt motor
12.Ward-Leonard controlled DC drives are generally used for ___________ excavators.
- ALight duty
- BMedium duty
- CHeavy duty
- DAll of the above
13.Which of the following motors is used fir elevators?
- AInduction motor
- BSynchronous motor
- CCapacitor start single phase motor
- DAny of the above
14.Which part of a motor needs maximum attention for maintenance?
- AFrame
- BBearing
- CStator winding
- DRotor winding
15._____________ need frequent starting and stopping of electric motors.
- APaper mills
- BGrinding mills
- CAir-conditioners
- DLifts and hoists
16.Which feature, while selecting a motor for centrifugal pump, will be of least significance?
- AStarting characteristics
- BOperating speed
- CHorse power
- DAped control
17.____________ Motor is a constant speed motor.
- ASynchronous motor
- BSchrage motor
- CInduction motor
- DUniversal motor
18.The starting torque in case of centrifugal pumps is generally
- ALess than running torque
- BSame as running torque
- CSlightly more than running torque
- DDouble the running torque
19.Which of the following motors are best for the rolling mills?
- ASingle phase motors
- BSquirrel cage induction motors
- CSlip ring induction motors
- DDC motors
20.___________is not a part of ball bearing?
- AInner race
- BOuter race
- CCage
- DBush