McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .
| 1. |
Which of the following instruments is used for the comparison of candle powers of different sources? |
| A. | radiometer |
| B. | bunsen meter |
| C. | photometer |
| D. | candle meter |
| Answer» C. photometer | |
| 2. |
The illumination at various points on a horizontal surface illuminated by the same source varies as |
| A. | cos3θ |
| B. | cos θ |
| C. | 1/r2 |
| D. | cos2θ. |
| Answer» A. cos3θ | |
| 3. |
Floodlighting is NOT used for purposes. |
| A. | reading |
| B. | aesthetic |
| C. | advertising |
| D. | industrial. |
| Answer» A. reading | |
| 4. |
Which of the following lamp has minimum initial cost of installation but maximum running cost ? |
| A. | incandescent |
| B. | fluorescent |
| C. | mercury vapour |
| D. | sodium vapour. |
| Answer» A. incandescent | |
| 5. |
Candela is the unit of which of the following? |
| A. | wavelength |
| B. | luminous intensity |
| C. | luminous flux |
| D. | frequency |
| Answer» B. luminous intensity | |
| 6. |
Colour of light depends upon |
| A. | frequency |
| B. | wave length |
| C. | both (a) and (b) |
| D. | speed of light |
| Answer» C. both (a) and (b) | |
| 7. |
Illumination of one lumen per sq. metre is called |
| A. | lumen metre |
| B. | lux |
| C. | foot candle |
| D. | candela |
| Answer» B. lux | |
| 8. |
A solid angle is expressed in terms of |
| A. | radians/metre |
| B. | radians |
| C. | steradians |
| D. | degrees |
| Answer» C. steradians | |
| 9. |
The unit of luminous flux is . |
| A. | watt/m2 |
| B. | lumen |
| C. | lumen/m2 |
| D. | watt |
| Answer» B. lumen | |
| 10. |
Filament lamps operate normally at a power factor of |
| A. | 0.5 lagging |
| B. | 0.8 lagging |
| C. | unity |
| D. | 0.8 leading |
| Answer» C. unity | |
| 11. |
The filament of a GLS lamp is made of |
| A. | tungsten |
| B. | copper |
| C. | carbon |
| D. | aluminium |
| Answer» A. tungsten | |
| 12. |
Which of the following lamps is the cheapest for the same wattage? |
| A. | fluorescent tube |
| B. | mercury vapour lamp |
| C. | gls lamp |
| D. | sodium vapour lamp |
| Answer» C. gls lamp | |
| 13. |
On which of the following factors dies the depreciation or maintenance factor depend? |
| A. | lamp cleaning schedule |
| B. | ageing of the lamp |
| C. | type of work carried out at the premises |
| D. | all of the above factors |
| Answer» D. all of the above factors | |
| 14. |
For the same lumen output, the running cost of the fluorescent lamp is |
| A. | equal to that of filament lamp |
| B. | less than that of filament lamp |
| C. | more than that of filament lamp |
| D. | any of the above |
| Answer» B. less than that of filament lamp | |
| 15. |
The flicker effect of fluorescent lamps is more pronounced at |
| A. | lower frequencies |
| B. | higher frequencies |
| C. | lower voltages |
| D. | higher voltages |
| Answer» A. lower frequencies | |
| 16. |
...... is a cold cathode lamp. |
| A. | fluorescent lamp |
| B. | neon lamp |
| C. | mercury vapour lamp |
| D. | sodium vapour lamp |
| Answer» B. neon lamp | |
| 17. |
For normal reading the illumination level required is around |
| A. | 20-40 lumens/m2 |
| B. | 60-100 lumens/m2 |
| C. | 200-300 lumens/m2 |
| D. | 400-500 lumens/m2 |
| Answer» B. 60-100 lumens/m2 | |
| 18. |
Which gas can be filled in GLS lamps? |
| A. | oxygen |
| B. | carbon dioxide |
| C. | xenon |
| D. | any inert gas |
| Answer» D. any inert gas | |
| 19. |
Which of the following is not the type of refrigerant? |
| A. | organic refrigerants |
| B. | inorganic refrigerants |
| C. | azeotrope refrigerants |
| D. | halo-helium refrigerants |
| Answer» D. halo-helium refrigerants | |
| 20. |
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» B. primary, secondary | |
| 21. |
Which one of the following inorganic refrigerants is often used? |
| A. | nh3 |
| B. | co2 |
| C. | h2o |
| D. | so2 |
| Answer» A. nh3 | |
| 22. |
From the following refrigerants, which is one of the most stable refrigerants? |
| A. | ammonia |
| B. | r – 12 |
| C. | carbon dioxide |
| D. | sulphur dioxide |
| Answer» D. sulphur dioxide | |
| 23. |
In the presence of which of the following, Sulphur dioxide becomes corrosive? |
| A. | r – 12 |
| B. | ammonia |
| C. | water |
| D. | carbon dioxide |
| Answer» C. water | |
| 24. |
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» B. r – 717 | |
| 25. |
Where is the reciprocating compressor mostly suitable? |
| A. | small displacements and low condensing pressures |
| B. | small displacements and high condensing pressures |
| C. | large displacements and low condensing pressures |
| D. | large displacements and high condensing pressures |
| Answer» B. small displacements and high condensing pressures | |
| 26. |
Which of the following is the condition to use two compressors in the refrigeration system? |
| A. | the desired temperature is 3°c |
| B. | the desired temperature is -3°c |
| C. | the desired temperature is -50°c |
| D. | the desired temperature is -5°c |
| Answer» C. the desired temperature is -50°c | |
| 27. |
Centrifugal compressors are used to handle volume of refrigerant. |
| A. | small |
| B. | medium |
| C. | large |
| D. | very large |
| Answer» C. large | |
| 28. |
Which of the following cooling towers possess maximum heat transfer from air to water? |
| A. | natural draft |
| B. | mechanical draft |
| C. | natural and mechanical draft |
| D. | atmospheric draft |
| Answer» B. mechanical draft | |
| 29. |
Which of the following is true about the optimum effective temperature for human comfort? |
| A. | same in winter and summer |
| B. | not dependent on season |
| C. | lower in winter than in summer |
| D. | higher in winter than in summer |
| Answer» C. lower in winter than in summer | |
| 30. |
When the heat stored in the body is the human body feels comfortable. |
| A. | zero |
| B. | infinite |
| C. | positive |
| D. | negative |
| Answer» A. zero | |
| 31. |
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» A. direct expansion systems | |
| 32. |
Which of the following types of filters used in the air conditioning system is made of cloth that is discarded on getting dirty? |
| A. | viscous type filters |
| B. | dry filter |
| C. | spray washers |
| D. | electric precipitators |
| Answer» B. dry filter | |
| 33. |
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» D. dehumidification | |
| 34. |
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» C. salts of calcium or ammonia | |
| 35. |
Magnetic materials are heated with the help of |
| A. | hysteresis loss |
| B. | electric arc |
| C. | electric current |
| D. | radiation. |
| Answer» A. hysteresis loss | |
| 36. |
In the indirect resistance heating method, heat is delivered to the charge |
| A. | direcly |
| B. | by radiation |
| C. | by convection |
| D. | both (b) and (c). |
| Answer» D. both (b) and (c). | |
| 37. |
Electric ovens using heating elements of........................... can produce temperatures up to 3000°C |
| A. | nickel |
| B. | graphite |
| C. | chromium |
| D. | iron. |
| Answer» B. graphite | |
| 38. |
Which of the following heating method is based on the transformer principle ? |
| A. | resistance heating |
| B. | eddy-current heating |
| C. | induction heating |
| D. | dielectric heating. |
| Answer» C. induction heating | |
| 39. |
Which of the following furnace suffers from pinch effect? |
| A. | resistance furnace |
| B. | core type induction furnace |
| C. | coreless induction furnace |
| D. | vertical core type induction furnace. |
| Answer» B. core type induction furnace | |
| 40. |
The coreless induction furnace uses high-frequency electric supply in order to obtain high |
| A. | flux density |
| B. | eddy-current loss |
| C. | primary resistance |
| D. | power factor. |
| Answer» B. eddy-current loss | |
| 41. |
Spot welding is used for |
| A. | thin metal sheets |
| B. | rough and irregular surfaces |
| C. | costings only |
| D. | thick sections |
| Answer» A. thin metal sheets | |
| 42. |
Which of the following is an advantages of heating by electricity? |
| A. | quicker operation |
| B. | higher efficiency |
| C. | absence of flue gases |
| D. | all of the above |
| Answer» B. higher efficiency | |
| 43. |
...... has the highest value of thermal conductivity. |
| A. | copper |
| B. | aluminium |
| C. | brass |
| D. | steel |
| Answer» A. copper | |
| 44. |
...... method has leading power factor |
| A. | resistance heating |
| B. | dielectric heating |
| C. | arc heating |
| D. | induction heating |
| Answer» B. dielectric heating | |
| 45. |
Which of the following methods of heating is not dependent on the frequency of supply? |
| A. | induction heating |
| B. | dielectric heating |
| C. | electric resistance heating |
| D. | all of the above |
| Answer» C. electric resistance heating | |
| 46. |
When a body reflects entire radiation incident on it, then it is known as |
| A. | white body |
| B. | grey body |
| C. | black body |
| D. | transparent body |
| Answer» A. white body | |
| 47. |
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» A. temperature of the two bodies must be different | |
| 48. |
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» B. absorbs all incident radions | |
| 49. |
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» A. inside boiler furnaces | |
| 50. |
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» A. ablation | |
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