MCQOPTIONS
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MCQOPTIONS
This section includes 17 Mcqs, each offering curated multiple-choice questions to sharpen your Utilization Of Electrical Energy knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Carbon electrodes are used in:1. GLS lamps2. Dry cells3. Arc furnace |
| A. | 1, 2 and 3 |
| B. | 2 and 3 |
| C. | 1 and 3 |
| D. | Only 1 |
| Answer» C. 1 and 3 | |
| 2. |
A fluorescent tube can be operated on |
| A. | AC only |
| B. | DC only |
| C. | Both AC as well as DC |
| D. | None of these |
| Answer» D. None of these | |
| 3. |
A room of dimensions 10 m × 12 m is to be lighted by 20 lamps of uniform illumination of around 100 lm/m2. If the output of each lamp is around 1000 lumens, what will be the utilization factor of the room? |
| A. | 0.4 |
| B. | 0.6 |
| C. | 0.45 |
| D. | 0.5 |
| Answer» C. 0.45 | |
| 4. |
LED lamp have a general life expectancy of |
| A. | 1000 hrs |
| B. | 5000 hrs |
| C. | 15000 hrs |
| D. | 50000 Hrs |
| Answer» E. | |
| 5. |
Carbon arc lamps are commonly used in________. |
| A. | Domestic lighting |
| B. | Street lighting |
| C. | Cinema projectors |
| D. | Photography |
| Answer» D. Photography | |
| 6. |
A lamp of 500 watts having MSCP of 1000 is suspended 2.7 meters above the working plane. Calculate illumination directly below the lamp at the working plane. |
| A. | 100.87 lux |
| B. | 143.83 lux |
| C. | 137.17 lux |
| D. | 125.63 lux |
| Answer» D. 125.63 lux | |
| 7. |
Operating temperature of inner tube of sodium vapour lamp in °C is around |
| A. | 400 |
| B. | 500 |
| C. | 800 |
| D. | 300 |
| Answer» E. | |
| 8. |
Which is the colour of light is emitted by the sodium vapour lamp? |
| A. | Green |
| B. | Yellow |
| C. | Blue |
| D. | White |
| Answer» C. Blue | |
| 9. |
Incandescent lamps are ________ affected by input voltage. |
| A. | least |
| B. | strongly |
| C. | not at all |
| D. | can’t say |
| Answer» C. not at all | |
| 10. |
Determine the power factor of 230 V, 0.5 A, 40 W fluorescent lamp |
| A. | 0.348 |
| B. | 0.438 |
| C. | 0.843 |
| D. | 0.4038 |
| Answer» B. 0.438 | |
| 11. |
Fluorescent material Zinc silicate used in fluorescent tubes gives ______ color |
| A. | Green |
| B. | Yellow |
| C. | Pinkish white |
| D. | Blackish grey |
| Answer» B. Yellow | |
| 12. |
_____ lamps are used to light up sports stadiums. |
| A. | LED lamps |
| B. | Incandescent lamps |
| C. | Fluorescent lamps |
| D. | Sodium vapor lamps |
| Answer» E. | |
| 13. |
Lower power factor is usually not due to |
| A. | Incandescent lamp |
| B. | Induction motor |
| C. | Ceiling fan |
| D. | Induction furnace |
| Answer» B. Induction motor | |
| 14. |
Incandescent lamps operate normally at a power factor of |
| A. | 0.5 leading |
| B. | 0.5 lagging |
| C. | unity |
| D. | 0.8 lagging |
| Answer» D. 0.8 lagging | |
| 15. |
A room of dimensions 12 m × 16 m is to be lighted by 24 lamps of uniform illumination of around 100 lm/m2. If the output of each lamp is around 1600 lumens, what will be the utilization factor of the room? |
| A. | 0.4 |
| B. | 0.6 |
| C. | 0.45 |
| D. | 0.5 |
| Answer» E. | |
| 16. |
Power factor is highest in case of |
| A. | Mercury arc lamp |
| B. | Sodium vapour lamps |
| C. | Tube lights |
| D. | GLS lamps |
| Answer» E. | |
| 17. |
In lighting insulation using filament lamps, voltage drop of 1% results in: |
| A. | No loss of light |
| B. | 3.5% loss in the light output |
| C. | 1.5% loss in the light output |
| D. | 15% loss in the light output |
| Answer» C. 1.5% loss in the light output | |