MCQOPTIONS
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MCQOPTIONS
This section includes 43 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. |
The SI unit of power is? |
| A. | kW(kilo-watt) |
| B. | J/s(joules per second) |
| C. | Ws(watt-second) |
| D. | Ws(watt-second)d) J/h(joules per hour |
| Answer» C. Ws(watt-second) | |
| 2. |
Calculate the work done in a resistor of 20 ohm carrying 5A of current in 3 hours. |
| A. | 1.5J |
| B. | 15J |
| C. | 1.5kWh |
| D. | 15kWh |
| Answer» D. 15kWh | |
| 3. |
Calculate the power across each 10 ohm resistance. |
| A. | 1000kW, 1000kW |
| B. | 1kW, 1kW |
| C. | 100W, 100W |
| D. | 100kW, 100kW |
| Answer» C. 100W, 100W | |
| 4. |
Calculate the power across each 20 ohm resistance. |
| A. | 1000W, 1000W |
| B. | 500W, 500W |
| C. | 1000kW, 1000kW |
| D. | 500kW, 500kW |
| Answer» C. 1000kW, 1000kW | |
| 5. |
A current of 5A flows in a resistor of 2 ohms. Calculate the energy dissipated in 300 seconds in the resistor. |
| A. | 15kJ |
| B. | 15000kJ |
| C. | 1500J |
| D. | 15J |
| Answer» B. 15000kJ | |
| 6. |
Calculate the power in the 20 ohm resistance. |
| A. | 2000kW |
| B. | 2kW |
| C. | 200kW |
| D. | 2W |
| Answer» C. 200kW | |
| 7. |
The force required to tow a vehicle at constant velocity is directly proportional to the magnitude of velocity raised to the first power. It requires 1000 W to tow with a velocity of 10 m/s. How much power is required to tow at a velocity of 8 m/s? |
| A. | 320 W |
| B. | 640 W |
| C. | 160 W |
| D. | 80 W |
| Answer» C. 160 W | |
| 8. |
A body of mass 3 kg starts from rest with a uniform acceleration of unknown magnitude. If the body has a velocity of 30 m/s in 6 seconds, what is the power consumed in 3 seconds? |
| A. | 125 W |
| B. | 225 W |
| C. | 325 W |
| D. | 425 W |
| Answer» C. 325 W | |
| 9. |
A 200 kg wagon climbs up a hill of slope 30-degrees in 1 minute at a speed of 36 km/h. How much power is delivered by the engine if the frictional force is 25% of the weight of the car? (Assume g = 10m/s2) |
| A. | 25 kW |
| B. | 50 kW |
| C. | 100 kW |
| D. | 125 kW |
| Answer» B. 50 kW | |
| 10. |
A 200 kg wagon climbs up a hill of slope 30-degrees in 1 minute at a speed of 10 m/s. How much power is delivered by the engine? (Assume g = 10m/s2) |
| A. | 10 kW |
| B. | 20 kW |
| C. | 30 kW |
| D. | 40 kW |
| Answer» C. 30 kW | |
| 11. |
1000 kW of power is supplied to a motor. 90% of this is transmitted to a machine operating at 80% efficiency. The machine lifts an object of 10-tons with a velocity _____ m/s. (Assume g = 10m/s2) |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |
| 12. |
A 2-ton vehicle travels at 20m/s on a road where the frictional force is 10% of the weight of the vehicle. What is the power required? (Assume g = 10m/s2) |
| A. | 220 kW |
| B. | 240 kW |
| C. | 420 kW |
| D. | 440 kW |
| Answer» E. | |
| 13. |
A machine has a power of 20kW. How long will it take for it to lift a body of mass 10kg from the ground to a height of 100m? (Assume g = 10m/s2) |
| A. | 1 second |
| B. | 2 seconds |
| C. | 3 seconds |
| D. | 4 seconds |
| Answer» C. 3 seconds | |
| 14. |
A motor is used to pump water from a depth of 5 m to fill a volume of 10 cubic meters in 5 minutes. If 50% of the power is wasted, what is the power of the motor? (Assume g = 10m/s2) |
| A. | 1000/3 W |
| B. | 3000/3 W |
| C. | 5000/3 W |
| D. | 10000/3 W |
| Answer» E. | |
| 15. |
A motor is used to deliver water through a pipe. Let the motor have a power P initially. To double the rate of flow of water through the pipe, the power is increased to P’. What is the value of P’/P? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» E. | |
| 16. |
A machine gun fires 360 bullets per minute. Each bullet has a mass of 5 grams and travels at 600 m/s. What is the power of the gun? (Assume no loss of energy and 100% power transmission) |
| A. | 300 W |
| B. | 600 W |
| C. | 900 W |
| D. | 1800 W |
| Answer» D. 1800 W | |
| 17. |
What are the units of power? |
| A. | Newton |
| B. | Joule |
| C. | Watt |
| D. | No units |
| Answer» D. No units | |
| 18. |
Power is the time derivative of which quantity? |
| A. | Energy |
| B. | Acceleration |
| C. | Velocity |
| D. | Position |
| Answer» B. Acceleration | |
| 19. |
Which of the following is not a unit of power? |
| A. | erg/second |
| B. | kgm2s-3 |
| C. | Horsepower |
| D. | Joule |
| Answer» E. | |
| 20. |
The force applied on a body can be given as F = 4i + 2j + 6k. The displacement of the body is given by s = 3i + 9k. Calculate the power at t = 2 seconds. |
| A. | 66 W |
| B. | 33 W |
| C. | 30 W |
| D. | 15 W |
| Answer» C. 30 W | |
| 21. |
What is the unit of Bond’s constant? |
| A. | kW mm1/2 s/kg |
| B. | kW mm s/kg |
| C. | kW mm1/2 kg/s |
| D. | kW mm kg/s |
| Answer» B. kW mm s/kg | |
| 22. |
Which of the following is the correct formula of Bond’s law? |
| A. | \(\frac {P}{m}\) = kb\((\frac {1}{\sqrt {D_{sb}}} + \frac {1}{\sqrt {D_{sa}}}) \) |
| B. | P = kb\((\frac {1}{\sqrt {D_{sb}}} – \frac {1}{\sqrt {D_{sa}}}) \) |
| C. | \(\frac {P}{m}\) = kb\((\frac {1}{\sqrt {D_{sb}}} – \frac {1}{\sqrt {D_{sa}}}) \) |
| D. | P = kb\((\frac {1}{\sqrt {D_{sb}}} + \frac {1}{\sqrt {D_{sa}}}) \) |
| Answer» D. P = kb\((\frac {1}{\sqrt {D_{sb}}} + \frac {1}{\sqrt {D_{sa}}}) \) | |
| 23. |
What are the dimensions of power? |
| A. | [ML2T-3] |
| B. | [ML2T-1] |
| C. | [ML1T-3] |
| D. | [ML3T-3] |
| Answer» C. [ML1T-3] | |
| 24. |
What is the unit of Kick’s constant? |
| A. | kg / kW |
| B. | kW * s/kg |
| C. | kW * kg/s |
| D. | kg * s/kW |
| Answer» C. kW * kg/s | |
| 25. |
Calculate the power required in Watts, if the work done can be given as w = 3t4 – 16t at t = 5 seconds. |
| A. | 1795 W |
| B. | 1420 W |
| C. | 1484 W |
| D. | 1675 W |
| Answer» D. 1675 W | |
| 26. |
Work index is the gross energy required to reduce very large feed to a size such that, 65 percent of the product passes through a 100 – µm mesh screen. |
| A. | True |
| B. | False |
| Answer» C. | |
| 27. |
Using Rittinger’s law, calculate the power required to crush 12 ton/hr of rocks, if 10 ton/hr rocks were crushed at a power of 9 hp. The diameter of the rocks was reduced from 3 cm to 0.5 cm in each case. |
| A. | 10.7 hp |
| B. | 11 hp |
| C. | 10.8 hp |
| D. | 12 hp |
| Answer» E. | |
| 28. |
Automatic switching OFF function is accomplished in MCB by ______ |
| A. | Relay |
| B. | clutch |
| C. | bimetallic-strip |
| D. | diode |
| Answer» D. diode | |
| 29. |
Full form of UPS is |
| A. | Undersized Power Supply |
| B. | Uninterrupted Power Supply |
| C. | Uneven Power Supply |
| D. | Unwanted Power Supply |
| Answer» C. Uneven Power Supply | |
| 30. |
Phase information of UPS is of no use during |
| A. | voltage dip |
| B. | long sags |
| C. | interruptions |
| D. | All of the above |
| Answer» E. | |
| 31. |
Consider the following statements regarding linear power supply :1. It requires a low-frequency transformer.2. It requires a high-frequency transformer.3. The transistor works in the active region.Which of the above statements is/are correct? |
| A. | 1 only |
| B. | 2 and 3 only |
| C. | 1 and 3 only |
| D. | 3 only |
| Answer» D. 3 only | |
| 32. |
In which order the blocks appear in the block diagram of a complete regulated power supply unit? |
| A. | Rectifier-regulation-filter-transformer-load |
| B. | Transformer-rectifier-filter-regulator-load |
| C. | Transformer-rectifier-regulator-filter-load |
| D. | Rectifier-regulator-filter-transformer-load |
| Answer» C. Transformer-rectifier-regulator-filter-load | |
| 33. |
An inverter module in a power supply converts |
| A. | AC to DC |
| B. | DC to AC |
| C. | AC to AC |
| D. | DC to DC |
| Answer» C. AC to AC | |
| 34. |
In the SMPS regulator is accompanied by: |
| A. | Duty cycle control |
| B. | Regulator IC |
| C. | Zener |
| D. | Stabilizer |
| Answer» B. Regulator IC | |
| 35. |
An offline UPS requires: |
| A. | Inductor |
| B. | Capacitor |
| C. | Battery |
| D. | Resistor |
| Answer» D. Resistor | |
| 36. |
A water boiler of home is switched on to the a.c. mains supplying power at 230V/50Hz. The frequency of instantaneous power consumed by the boiler is |
| A. | 0 Hz |
| B. | 50 Hz |
| C. | 100 Hz |
| D. | 150 Hz |
| Answer» D. 150 Hz | |
| 37. |
A solar water heater cannot be used to get hot water on a _________. |
| A. | hot day |
| B. | sunny day |
| C. | windy day |
| D. | cloudy day |
| Answer» E. | |
| 38. |
CALCULATE_THE_WORK_DONE_IN_A_RESISTOR_OF_20_OHM_CARRYING_5A_OF_CURRENT_IN_3_HOURS.?$ |
| A. | 1.5J |
| B. | 15J |
| C. | 1.5kWh |
| D. | 15kWh |
| Answer» D. 15kWh | |
| 39. |
The_SI_unit_of_power_is?$ |
| A. | kW(kilo-watt) |
| B. | J/s(joules per second) |
| C. | Ws(watt-second) |
| D. | J/h(joules per hour |
| Answer» C. Ws(watt-second) | |
| 40. |
A current of 5A flows in a resistor of 2 ohms. Calculate the power in the resistor and the energy dissipated in 300 seconds. |
| A. | 15kJ |
| B. | 15000kJ |
| C. | 1500J |
| D. | 15J |
| Answer» B. 15000kJ | |
| 41. |
Kilowatt-hour(kWh) is a unit of? |
| A. | Current |
| B. | Power |
| C. | Energy |
| D. | Resistance |
| Answer» D. Resistance | |
| 42. |
A 250V bulb passes a current of 0.3A. Calculate the power in the lamp. |
| A. | 75W |
| B. | 50W |
| C. | 25W |
| D. | 90W |
| Answer» B. 50W | |
| 43. |
Which of the following is not an expression power? |
| A. | P=VI |
| B. | P=I<sup>2</sup>R |
| C. | P=V<sup>2</sup>/R |
| D. | All of the mentioned |
| Answer» B. P=I<sup>2</sup>R | |