McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .
| 1. |
The selection of an electric motor for any application depends on which of the following factors ? |
| A. | Electrical characteristics |
| B. | Mechanical characteristics |
| C. | Size and rating of motors |
| D. | All of the above |
| Answer» D. All of the above | |
| 2. |
For a particular application the type of electric-and control gear are determined by which of the following considerations ? |
| A. | Starting torque |
| B. | Conditions of environment |
| C. | Limitation on starting current |
| D. | All of the above |
| Answer» D. All of the above | |
| 3. |
Which ofthefollowingmotors is preferred for traction work ? |
| A. | Universal motor |
| B. | D.C. series motor |
| C. | Synchronous motor |
| D. | Three-phase induction motor |
| Answer» B. D.C. series motor | |
| 4. |
Which of the following motors always starts on load ? |
| A. | Conveyor motor |
| B. | Floor mill motor |
| C. | Fan motor |
| D. | All of the above |
| Answer» D. All of the above | |
| 5. |
is preferred for automatic drives. |
| A. | Squirrel cage induction motor |
| B. | Synchronous motors |
| C. | Ward-Leonard controlled |
| D. | C. motors |
| Answer» C. Ward-Leonard controlled | |
| 6. |
When the load is above a synchronous motor is found to be more economical. |
| A. | 2 kW |
| B. | 20 kW |
| C. | 50 kW |
| D. | 100 kW |
| Answer» D. 100 kW | |
| 7. |
The load cycle for a motor driving a power press will be |
| A. | variable load |
| B. | continuous |
| C. | continuous but periodical |
| D. | intermittent and variable load |
| Answer» D. intermittent and variable load | |
| 8. |
Light duty cranes are used in which of the following ? |
| A. | Power houses |
| B. | Pumping stations |
| C. | Automobile workshops |
| D. | All of the above |
| Answer» D. All of the above | |
| 9. |
While selecting an electric motor for a floor mill, which electrical characteristics will be of least significance ? |
| A. | Running characteristic |
| B. | Starting characteristics |
| C. | Efficiency |
| D. | Braking |
| Answer» D. Braking | |
| 10. |
Which of the following motors are pre-ferred for overhead travelling cranes ? |
| A. | Slow speed motor |
| B. | Continuous duty motors |
| C. | Short time rated motors |
| D. | None of the above |
| Answer» C. Short time rated motors | |
| 11. |
is preferred for synthetic fibre mills. |
| A. | Synchronous motor |
| B. | Reluctance motor |
| C. | Series motor |
| D. | Shunt motor |
| Answer» B. Reluctance motor | |
| 12. |
Ward-Leonard controlled D.C. drives are generally used for excavators. |
| A. | Light duty |
| B. | Medium duty |
| C. | Heavy duty |
| D. | All of the above |
| Answer» C. Heavy duty | |
| 13. |
Which of the following motors is used for elevators ? |
| A. | Induction motor |
| B. | Synchronous motor |
| C. | Capacitor start single phase motor |
| D. | Any of the above |
| Answer» A. Induction motor | |
| 14. |
Which part of a motor needs maximum attention for maintenance ? |
| A. | Frame |
| B. | Rearing |
| C. | Stator winding |
| D. | Rotor winding |
| Answer» B. Rearing | |
| 15. |
need frequent starting and stopping of electric motors, |
| A. | Paper mills |
| B. | Grinding mills |
| C. | Air-conditioners |
| D. | Lifts and hoists |
| Answer» D. Lifts and hoists | |
| 16. |
Which feature, while selecting a.motor for centrifugal pump, will be of least significance ? |
| A. | Starting characteristics |
| B. | Operating speed |
| C. | Horse power |
| D. | Speed control |
| Answer» D. Speed control | |
| 17. |
motor is a constant speed motor. |
| A. | Synchronous motor |
| B. | Schrage motor |
| C. | Induction motor |
| D. | Universal motor |
| Answer» A. Synchronous motor | |
| 18. |
The starting torque in case of centrifugal pumps is generally |
| A. | less than running torque |
| B. | same as running torque |
| C. | slightly more than running torque |
| D. | double the running torque |
| Answer» A. less than running torque | |
| 19. |
Which of the following motors are best for the rolling mills ? |
| A. | Single phase motors |
| B. | Squirrel cage induction motors |
| C. | Slip ring induction motors |
| D. | D.C. motors |
| Answer» D. D.C. motors | |
| 20. |
is not a part of ball bearing ? |
| A. | Inner race |
| B. | Outer race |
| C. | Cage |
| D. | Bush |
| Answer» D. Bush | |
| 21. |
The starting torque of a D.C. motor is independent of which of the following? |
| A. | Flux |
| B. | Armature current |
| C. | Flux and armature current |
| D. | Speed |
| Answer» D. Speed | |
| 22. |
Rotor of a motor is usually supported on bearings. |
| A. | ball or roller |
| B. | needle |
| C. | bush |
| D. | thrust |
| Answer» A. ball or roller | |
| 23. |
For which of the following applications D.C. motors are still preferred? |
| A. | High efficiency operation |
| B. | Reversibility |
| C. | Variable speed drive |
| D. | High starting torque |
| Answer» C. Variable speed drive | |
| 24. |
In a paper mill where constant speed is required |
| A. | synchronous motors are preferred |
| B. | A.C. motors are preferred |
| C. | individual drive is preferred |
| D. | group drive is preferred |
| Answer» C. individual drive is preferred | |
| 25. |
A reluctance motor |
| A. | is provided with slip rings |
| B. | requires starting gear |
| C. | has high cost |
| D. | is compact |
| Answer» D. is compact | |
| 26. |
The size of an excavator is usually expressed in terms of |
| A. | ‘crowd’ motion |
| B. | angle of swing |
| C. | cubic metres |
| D. | travel in metres |
| Answer» C. cubic metres | |
| 27. |
For blowers which of the following motor is preferred ? |
| A. | D.C. series motor |
| B. | D.C. shunt motor |
| C. | Squirrel cage induction motor |
| D. | Wound rotor induction motor |
| Answer» B. D.C. shunt motor | |
| 28. |
Belted slip ring induction motor is almost invariably used for |
| A. | water pumps |
| B. | jaw crushers |
| C. | centrifugal blowers |
| D. | none of the above |
| Answer» B. jaw crushers | |
| 29. |
Which of the following is essentially needed while selecting a motor ? |
| A. | Pulley |
| B. | Starter |
| C. | Foundation pedal |
| D. | Bearings |
| Answer» B. Starter | |
| 30. |
Reluctance motor is a |
| A. | variable torque motor |
| B. | low torque variable speed motor |
| C. | self starting type synchronous motor |
| D. | low noise, slow speed motor |
| Answer» C. self starting type synchronous motor | |
| 31. |
method of starting a three phase induction motor needs six terminals. |
| A. | Stardelta |
| B. | Resistance starting |
| C. | Auto-transformer |
| D. | None of the above |
| Answer» A. Stardelta | |
| 32. |
In method of staging three phase induction motors the starting voltage is not reduced. |
| A. | auto-transformer |
| B. | star-delta |
| C. | slip ring |
| D. | any of the above |
| Answer» C. slip ring | |
| 33. |
In jaw crushers a motor has to often start against load. |
| A. | heavy |
| B. | medium |
| C. | normal |
| D. | low |
| Answer» A. heavy | |
| 34. |
For a motor-generator set which of the following motors will be preferred ? |
| A. | Synchronous motor |
| B. | Slip ring induction motor |
| C. | Pole changing induction motor |
| D. | Squirrel cage induction motor |
| Answer» A. Synchronous motor | |
| 35. |
Which of the following motors is usually preferred for kiln drives? |
| A. | Cascade controlled A.C. motor |
| B. | Slip ring induction motor |
| C. | Three phase shunt wound com-mutator motor |
| D. | Any of the above |
| Answer» D. Any of the above | |
| 36. |
Heat control switches are used in |
| A. | transformers |
| B. | cooling ranges |
| C. | three phase induction motors |
| D. | single phase |
| Answer» B. cooling ranges | |
| 37. |
has relatively wider range of speed control. |
| A. | Synchronous motor |
| B. | Ship ring induction motor |
| C. | Squirrel cage induction motor |
| D. | D.C. shunt motor |
| Answer» D. D.C. shunt motor | |
| 38. |
In squirrel cage induction motors which of the following methods of starting cannot be used ? |
| A. | Resistance in rotor circuit |
| B. | Resistance in stator circuit |
| C. | Auto-transformer starting |
| D. | Star-delta starting |
| Answer» A. Resistance in rotor circuit | |
| 39. |
In which of the following applications the load on motor changes in cyclic order? |
| A. | Electric shovels |
| B. | Cranes |
| C. | Rolling mills |
| D. | All of the above |
| Answer» D. All of the above | |
| 40. |
Flame proof motors are used in |
| A. | paper mills |
| B. | steel mills |
| C. | moist atmospheres |
| D. | explosive atmospheres |
| Answer» D. explosive atmospheres | |
| 41. |
Which of the following machines has heavy fluctuation of load ? |
| A. | Printing machine |
| B. | Punching machine |
| C. | Planer |
| D. | Lathe |
| Answer» B. Punching machine | |
| 42. |
For derries and winches which of the following drives can be used ? |
| A. | Pole changing squirrel cage motors |
| B. | D.C. motors with Ward-leonard con-trol |
| C. | A.C. slip ring motors with variable resistance |
| D. | Any of the above |
| Answer» D. Any of the above | |
| 43. |
Battery operated scooter for braking uses |
| A. | plugging |
| B. | mechanical braking |
| C. | regenerative braking |
| D. | rheostatic braking |
| Answer» B. mechanical braking | |
| 44. |
has least range of speed control. |
| A. | Slip ring induction motor |
| B. | Synchronous motor |
| D. | C. shunt motor |
| Answer» B. Synchronous motor | |
| 45. |
has the least value of starting torque to full load torque ratio. |
| A. | D.C. shunt motor |
| B. | D.C. series motor |
| C. | Squirrel cage induction motor |
| D. | Slip ring induction motor |
| Answer» C. Squirrel cage induction motor | |
| 46. |
In case of speed control by injecting e.m.f. in the rotor circuit is possible, |
| A. | d.c. shunt motor |
| B. | schrage motor |
| C. | synchronous motor |
| D. | slip ring induction motor |
| Answer» D. slip ring induction motor | |
| 47. |
A pony motor is used for the starting which of the following motors ? |
| A. | Squirel cage induction motor |
| B. | Schrage motor |
| C. | Synchronous motor |
| D. | None of the above |
| Answer» C. Synchronous motor | |
| 48. |
In the speed can be varied by changing the position of brushes. |
| A. | slip ring motor |
| B. | schrage motor |
| C. | induction motor |
| D. | repulsion motor |
| Answer» B. schrage motor | |
| 49. |
In which of the following applications variable speed operation is preferred ? |
| A. | Exhaust fan |
| B. | Ceiling fan |
| C. | Refrigerator |
| D. | Water pump |
| Answer» B. Ceiling fan | |
| 50. |
Heavy duty cranes are used in |
| A. | ore handling plants |
| B. | steel plants |
| C. | heavy engineering workshops |
| D. | all of the above |
| Answer» D. all of the above | |
Done Studing? Take A Test.
Great job completing your study session! Now it's time to put your knowledge to the test. Challenge yourself, see how much you've learned, and identify areas for improvement. Don’t worry, this is all part of the journey to mastery. Ready for the next step? Take a quiz to solidify what you've just studied.