Electric drives and motor MCQ Part-1

1. The basic elements of an electric drive are__________.

a. Electric motor and the transmission system

b. Electric motor, the transmission and control system

c. The transmission and control system

d. Electric motor and convenient equipment

2. Electric drive is becoming more and more popular because________.

a. It is simple, clean, compact and reliable

b. It provides easy and smooth control, flexibility in layout, easy starting and facility for remote control

c. It is cheaper in initial as well as in maintenance cost

d. All of the above 

3. The main drawback of electric drive is__________.

a. Electrical power supply failure makes the drive standstill

b. It is cumbersome drive

c. It is costlier in initial as well as in maintenance 

d. All of the above

4. An existing workshop is to be changed over from an engine drive to an electric drive. The type of drive likely to be adopted is________.

a. Individual drive

b. Multi-motor drive

c. Group drive

d. Any of the above

5. The type of drive used for a paper mill requiring constant speed operation and flexibility of control is_________.

a. Multimotor drive

b. Group drive

c. Individual drive

d. Individual drive and multimotor drive

6. Introduction of automation in production processes has become possible and flexibility of control is__________.

a. Group drives

b. Individual drive

c. Individual drive and multimotor drive

d. An electric drive

7. The selection of an electric motor  is governed by_________.

a. Nature electric supply available

b. Environmental conditions

c. Nature of load to be handled

d. All of the above

 

8. DC motors are still preferred for use in________.

a. Paper industry

b. Flour mills and jaw crushers

c. Lathes and machine tools 

d. Electric excavators, steel mills and cranes

9.  The least significant electrical characteristics in selection of electric motor for a flour mill is ________.

a. Efficiency

b. Running characteristics

c. Braking

d. Starting characteristics 

10. The least significant feature while selecting a motor for centrifugal pump is________.

a. Starting characteristics

b. Operation speed 

c. Power rating of motor 

d. Speed control

 

11. A typical active load is__________.

a. Lathe

b. Hoist

c. Blower

d. Pump

12. An elevator drive is required to operate in____________.

a. One quadrant only

b. Two quadrant only

c. Three quadrant only

d. Four quadrant only

 

13. Load torque constant at all speeds is represented by a_________.

a. Centrifugal pump load 

b. Compressor

c. Fan

14. An example of a motor having short-time duty is found in________.

a. Drilling machine

b. Centrifugal pumps 

c. Crane drives

d. All of the above

15. The load, for which motor always starts on load is_________.

a. Flour mill motor

b. Conveyor motor

c. Fan motor

d. All of the above

 

16.  The load cycle for a motor driving a power press will be ________.

a. Continuous  but periodical 

b. Variable

c. Continuous

d. Intermittent and variable

17. The application(s) that need(s) frequent starting and stopping is/are_______.

a. Grinding mills 

b. Lifts and hoists

c. Paper mills 

c. Blowers and fans

18. An electric motor, in jaw crushers, has to often start against_______.

a. Low load

b. Heavy load 

c. Normal load

d. Medium load

19. The application(s) in which the load on the motor changes in cyclic order is/are________.

a. Electric shovels

b. Rolling mills 

c. Cranes

d. All of the above

 

20. The machine having heavy fluctuation of load is________.

a. Lathe

b. Planer

c. Printing machine

d. Punching machine

 

21. Variable speed operation is preferred in__________.

a. Refrigerator

b. Exhaust fan

c. Ceiling fan 

d. Water pump

22. The application in which the motor is to start with high acceleration is_________.

a. Oil expeller 

b. Flour mill

c. Centrifugal pump

d. Lifts and hoists

 

23. While selecting a motor for air-conditioner the feature of utmost importance is _________.

a. Type of bearing 

b. Noise

c. Type of enclosure

d. Power transmission arrangement

24. Belt conveyors offer....staring torque_________.

a. Zero

b. Low

c. High 

d. Medium

25. The characteristic(s) of drive for crane hoisting and lowering is are_______.

a. Precise control

b. Smooth movement

c. Precise control

d. All of the above

 

• Electric Drives and Motors MCQ Part-2
• Electric Drives and Motors MCQ Part-3
• Electric Drives and Motors MCQ Part-4
• Electric Drives and Motors MCQ Part-5
• Electric Drives and Motors MCQ Part-6
• Electric Drives and Motors MCQ Part-7
• Electric Drives and Motors MCQ Part-8
• Electric Drives and Motors MCQ Part-9
• Electric Drives and Motors MCQ Part-10