MCQOPTIONS
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MCQOPTIONS
This section includes 93 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Centrifugal compressors are used to handle volume of refrigerant. |
| A. | small |
| B. | medium |
| C. | large |
| D. | very large |
| Answer» D. very large | |
| 2. |
Room air conditioners and packaged units are examples of |
| A. | direct expansion systems |
| B. | indirect expansion systems |
| C. | chilled water systems |
| D. | indirect contraction systems |
| Answer» B. indirect expansion systems | |
| 3. |
Electric ovens using heating elements of........................... can produce temperatures up to 3000°C |
| A. | nickel |
| B. | graphite |
| C. | chromium |
| D. | iron. |
| Answer» C. chromium | |
| 4. |
Which of the following is capable of absorbing excess moisture from the air? |
| A. | silica gel |
| B. | charcoal |
| C. | salts of calcium or ammonia |
| D. | activated alumina |
| Answer» D. activated alumina | |
| 5. |
is widely used in large industrial plants such as cold storages and ice plants as per the cost basis. |
| A. | r – 40 |
| B. | r – 717 |
| C. | r – 744 |
| D. | r – 764 |
| Answer» C. r – 744 | |
| 6. |
The refrigerants which are first cooled by refrigerants and then used for cooling purposes are known as refrigerants. |
| A. | secondary, primary |
| B. | primary, secondary |
| C. | tertiary, primary |
| D. | secondary, tertiary |
| Answer» C. tertiary, primary | |
| 7. |
The process of heat transfer during the re-entry of satellites and missiles, at very high speeds, into earth’s atmosphere is known as |
| A. | ablation |
| B. | radiation |
| C. | viscous dissipation |
| D. | irradiation |
| Answer» B. radiation | |
| 8. |
When the heat stored in the body is the human body feels comfortable. |
| A. | zero |
| B. | infinite |
| C. | positive |
| D. | negative |
| Answer» B. infinite | |
| 9. |
Grounding transformer is used where neutral available |
| A. | is |
| B. | is not |
| C. | any of above |
| D. | none of above |
| Answer» C. any of above | |
| 10. |
In case of earth fault, the underground neutral system lead to arcing ground |
| A. | does |
| B. | does not |
| C. | any of above |
| D. | none of above |
| Answer» B. does not | |
| 11. |
The process of extraction of the certain required amount of water from air is known as |
| A. | heating |
| B. | cooling |
| C. | humidification |
| D. | dehumidification |
| Answer» E. | |
| 12. |
Ground resistance value for sensitive installations is |
| A. | less than 5 Ω |
| B. | more than 5 Ω |
| C. | equal to 50 Ω |
| D. | any of above |
| Answer» B. more than 5 Ω | |
| 13. |
Grounding transformer is used where neutral                  available |
| A. | is |
| B. | is not |
| C. | any of above |
| D. | none of above |
| Answer» C. any of above | |
| 14. |
In a substation the equipment used to limit short circuit current level is |
| A. | series reactor |
| B. | coupling capacitor |
| C. | lightening switch |
| D. | isolator. |
| Answer» B. coupling capacitor | |
| 15. |
In a star connected system without neutral grounding, zero sequence currents are |
| A. | zero |
| B. | phaser sum of phase currents |
| C. | same as rms value of phase currents |
| D. | same as peak value of phase currents |
| Answer» B. phaser sum of phase currents | |
| 16. |
The advantage of neutral earthing |
| A. | safety of personnel |
| B. | reduction of earth fault current |
| C. | elimination of arcing ground |
| D. | none of the above |
| Answer» D. none of the above | |
| 17. |
In case of earth fault, the underground neutral system                    lead to arcing ground |
| A. | does |
| B. | does not |
| C. | any of above |
| D. | none of above |
| Answer» B. does not | |
| 18. |
In equipment grounding, the enclosure is connected to ...........wire |
| A. | ground |
| B. | neutral |
| C. | phase |
| D. | either a or b |
| Answer» B. neutral | |
| 19. |
Grounding transformer is used where neutral .........available |
| A. | is |
| B. | is not |
| C. | either a or b |
| D. | . none of the above |
| Answer» C. either a or b | |
| 20. |
Which of the following causes the corrosion of terminals and clamps? |
| A. | spilled electrolyte |
| B. | increase in temperature |
| C. | decrease in pressure |
| D. | due to high current |
| Answer» B. increase in temperature | |
| 21. |
What is the total number of cells present in a 12-volt battery? |
| A. | 5 |
| B. | 6 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 22. |
Which of the following decreases within turn decreases the charging rate? |
| A. | temperature |
| B. | pressure |
| C. | enthalpy |
| D. | entropy |
| Answer» B. pressure | |
| 23. |
Which is the material used to as anode in a lithium-ion battery? |
| A. | brass foil coated with graphite |
| B. | aluminum foil coated with graphite |
| C. | copper foil coated with graphite |
| D. | stainless steel coated with graphite |
| Answer» C. copper foil coated with graphite | |
| 24. |
No discontinuity is observed in case of |
| A. | short break static ups configuration |
| B. | long break static ups configuration |
| C. | no break static ups configuration |
| D. | rotating type ups configuration |
| Answer» D. rotating type ups configuration | |
| 25. |
Static UPS requires |
| A. | only rectifier |
| B. | only inverter |
| C. | both inverter and rectifier |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 26. |
Earthing is necessary to give protection against |
| A. | electric shock |
| B. | voltage fluctuation |
| C. | overloading |
| D. | high temperature of the conductors |
| Answer» B. voltage fluctuation | |
| 27. |
Fuse is a piece of wire of a materi |
| A. | high melting point |
| B. | low melting point |
| C. | moderate melting point |
| D. | none of the above |
| Answer» C. moderate melting point | |
| 28. |
In case of---------free running and coasting periods are generally long. |
| A. | main-line service |
| B. | urban wervice |
| C. | sub-urban service |
| D. | all of the above |
| Answer» B. urban wervice | |
| 29. |
For 600 V D.C. line for tramcars, brack is connected to |
| A. | positive of the supply |
| B. | negative of the supply |
| C. | mid voltage of 300 v |
| D. | none of the above |
| Answer» C. mid voltage of 300 v | |
| 30. |
The return circuit for tram cars is through |
| A. | neutral wire |
| B. | rails |
| C. | cables |
| D. | common earthing |
| Answer» C. cables | |
| 31. |
For which of the following locomotives the maintenance requirements are the least? |
| A. | steam locomotives |
| B. | diesel locomotives |
| C. | electric locomotives |
| D. | equal in all of the above |
| Answer» D. equal in all of the above | |
| 32. |
which of the following track is electrified |
| A. | delhi-bombay |
| B. | delhi-madras |
| C. | delhi-howrah |
| D. | delhi-ahmedabad |
| Answer» D. delhi-ahmedabad | |
| 33. |
In case of locomotives the tractive power is provided by |
| A. | single cylinder double acting steam engine |
| B. | double cylinder, single acting steam engine |
| C. | double cylinder, double acting steam engine |
| D. | single stage steam turbine |
| Answer» D. single stage steam turbine | |
| 34. |
Which of the following drives is suitable for mines where explosive gas exists? |
| A. | steam engine |
| B. | diesel engine |
| C. | battery locomotive |
| D. | any of the above |
| Answer» D. any of the above | |
| 35. |
In a steam locomotive electric power is provided through |
| A. | overhead wire |
| B. | battery system |
| C. | small turbo-generator |
| D. | diesel engine generator |
| Answer» D. diesel engine generator | |
| 36. |
In tramways which of the following motors is used? |
| A. | d.c. shunt motor |
| B. | d.c. series motor |
| C. | a.c. three phase motor |
| D. | a.c. single phase capacitor start motor |
| Answer» C. a.c. three phase motor | |
| 37. |
The horsepower of steam locomotives is |
| A. | upto 1500 |
| B. | 1500 to 2000 |
| C. | 2000 to 3000 |
| D. | 3000 to 4000 |
| Answer» C. 2000 to 3000 | |
| 38. |
In India diesel locomotives are manufactured at |
| A. | ajmer |
| B. | varanasi |
| C. | bangalore |
| D. | jamalpur |
| Answer» C. bangalore | |
| 39. |
Skidding of a vehicle always occurs when |
| A. | braking effort exceeds its adhesive weight |
| B. | it negotiates a curve |
| C. | it passes over points and crossings |
| D. | brake is applied suddenly. |
| Answer» B. it negotiates a curve | |
| 40. |
Longer coasting period for a train results in |
| A. | higher acceleration |
| B. | higher retardation |
| C. | lower specific energy consumption |
| D. | higher schedule speed. |
| Answer» D. higher schedule speed. | |
| 41. |
The free-running speed of a train does NOT depend on the |
| A. | duration of stops |
| B. | distance between stops |
| C. | running time |
| D. | acceleration. |
| Answer» B. distance between stops | |
| 42. |
The major disadvantage of carbon arc welding is that |
| A. | there is occurrence of blow holes |
| B. | electrodes are consumed fast |
| C. | separate filler rod is needed |
| D. | bare electrodes are necessary. |
| Answer» B. electrodes are consumed fast | |
| 43. |
In electric welding, arc blow can be avoided by |
| A. | using bare electrodes |
| B. | welding away from earth ground connection |
| C. | using a.c. welding machines |
| D. | increasing arc length |
| Answer» D. increasing arc length | |
| 44. |
A.C. welding machine cannot be used for welding |
| A. | mig |
| B. | atomic hydrogen |
| C. | resistance |
| D. | submerged arc. |
| Answer» B. atomic hydrogen | |
| 45. |
The basic electrical requirement in arc welding is that there should be |
| A. | coated electrodes |
| B. | high open-circuit voltage |
| C. | no arc blow |
| D. | d.c. power supply. |
| Answer» C. no arc blow | |
| 46. |
Which of the following has the highest value of thermal conductivity? |
| A. | water |
| B. | steam |
| C. | solid ice |
| D. | melting ice |
| Answer» D. melting ice | |
| 47. |
The process of heat transfer during the re-entry of satellites and missiles, at very high speeds, into earth’s atmosphere is known as |
| A. | ablation |
| B. | radiation |
| C. | viscous dissipation |
| D. | irradiation |
| Answer» B. radiation | |
| 48. |
Heat is transferred simultaneously by condition, convection and radiation |
| A. | inside boiler furnaces |
| B. | during melting of ice |
| C. | through the surface of the insulted pipe caring steam |
| D. | from refrigerator coils to freezer of a refrigerator |
| Answer» B. during melting of ice | |
| 49. |
A perfect black body is one that |
| A. | transmits all incident radiations |
| B. | absorbs all incident radions |
| C. | reflects all incident radiations |
| D. | absorbs, reflects and transmits all incident radiations |
| Answer» C. reflects all incident radiations | |
| 50. |
For the transmission of heat from one body to another |
| A. | temperature of the two bodies must be different |
| B. | both bodies must be solids |
| C. | both bodies must be in contact |
| D. | at least one of the bodies must have some source of heating |
| Answer» B. both bodies must be solids | |