100 Important Industrial Drives MCQ Question & Answer | PDF Free Download
1.Which of the following motors has series characteristics?
- AShaded pole moto
- BRepulsion motor
- CCapacitor start motor
- DNone of the above
2.For a DC shunt motor which of the following is incorrect?
- AUnsuitable for heavy duty starting
- BTorque varies as armature current
- CTorque-armature current is a straight line
- DTorque is zero for zero armature current
3.For which of the following applications motor has to start with high acceleration?
- AOil expeller
- BFloor mill
- CLifts and hoists
- DTorque is zero for zero armature current
4.For which of the following applications motor has to start with high acceleration?
- AOil expeller
- BFloor mill
- CLifts and hoists
- DCentrifugal pump
5.Which of the following types of motor enclosure is safest?
- ATotally enclosed
- BTotally enclosed fan cooled
- COpen type
- DSemi closed
6.While selecting motor for an air conditioner which of the following characteristics is of great importance?
- AType of bearings
- BType of enclosure
- CNoise
- DArrangement for power transmission
7.The diameter of the rotor shaft for an electric motor depends on which of the following?
- ARpm only
- BHorse power only
- CHorse power and rpm
- DHorse power, rpm and power factor
8.Which of the following alternatives will be cheaper?
- AA 100 H.P. AC three phase motor
- BFour motors of 25 H.P. each
- CFive motors of 20 H.P. each
- DTen motors of 10 H.P. each
9.The cost of an induction motor will increase as
- AHorsepower rating increases but rpm decreases
- BHorsepower rating decreases but rpm increases
- CHorsepower rating and operating speed increases
- DHorsepower rating and operating speed decreases
10.In series motor which of the following methods can be used for changing the flux per pole?
- ATapped field control
- BDiverter field control
- CSeries-parallel control
- DAny of the above