MCQOPTIONS
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MCQOPTIONS
This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Thermodynamics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Air at a constant pressure in a piston-cylinder is at 300 K, 300 kPa and V=0.1 m^3. It is heated to 600 K in 30 seconds in a process with constant piston velocity. Find the power delivered to the piston. |
| A. | 1 kW |
| B. | 2 kW |
| C. | 3 kW |
| D. | 4 kW |
| Answer» B. 2 kW | |
| 2. |
A pressure of 650 kPa pushes a piston of radius 0.125 m with V = 5 m/s. What is the transmitted power? |
| A. | 139.5 kW |
| B. | 149.5 kW |
| C. | 159.5 kW |
| D. | 169.5 kW |
| Answer» D. 169.5 kW | |
| 3. |
A current of 10 amp runs through a resistor with resistance of 15 ohms. Find the rate of work that heats the resistor up. |
| A. | 1200 W |
| B. | 1300 W |
| C. | 1400 W |
| D. | 1500 W |
| Answer» E. | |
| 4. |
A battery is well insulated while being charged by 12.3 V at a current of 6 A. Take the battery as a control mass and find the instantaneous rate of work. |
| A. | 63.8 W |
| B. | 73.8 W |
| C. | 83.8 W |
| D. | 93.8 W |
| Answer» C. 83.8 W | |
| 5. |
A crane lifts a bucket of cement with a mass of 450 kg vertically up with a constant velocity of 2 m/s. Find the rate of work. |
| A. | 8.83 kW |
| B. | 8.33 kW |
| C. | 8.53 kW |
| D. | 8.63 kW |
| Answer» B. 8.33 kW | |
| 6. |
An escalator raises a 100 kg bucket of sand 10 m in a minute. Determine the rate of work done during the process. |
| A. | 143 W |
| B. | 153 W |
| C. | 163 W |
| D. | 173 W |
| Answer» D. 173 W | |
| 7. |
In a thermally insulated kitchen, a refrigerator with 2 kW motor for running the compressor provides 6000 kJ of cooling to the refrigerated space during 30 min operation. If the condenser coil placed behind the refrigerator rejects 8000 kJ of heat to the kitchen during the same period, calculate the change in internal energy of the kitchen. |
| A. | 3600 kJ |
| B. | 2400 kJ |
| C. | 4800 kJ |
| D. | none of the mentioned |
| Answer» B. 2400 kJ | |
| 8. |
A hydraulic cylinder has a piston(cross sectional area 25cm2) and a fluid pressure of 2 MPa. If piston moves by 0.25m, how much work is done? |
| A. | 0.25 kJ |
| B. | 1.25 kJ |
| C. | 2.25 kJ |
| D. | 3.25 kJ |
| Answer» C. 2.25 kJ | |
| 9. |
An escalator raises a 100 kg bucket of water 10 m in 60 seconds. Determine the amount of work done during the process. |
| A. | 9807 J |
| B. | 9307 J |
| C. | 9507 J |
| D. | 9107 J |
| Answer» B. 9307 J | |
| 10. |
A piston of mass 2 kg is lowered by 0.5 m. Find the work involved in the process. |
| A. | 7.805 J |
| B. | 8.805 J |
| C. | 9.805 J |
| D. | 10.805 J |
| Answer» D. 10.805 J | |
| 11. |
A radiant heating lamp has a temperature of 1000 K with = 0.8. What should be the surface area to provide 250 W of radiation heat transfer? |
| A. | 0.0035 m<sup>2</sup> |
| B. | 0.0055 m<sup>2</sup> |
| C. | 0.0075 m<sup>2</sup> |
| D. | 0.0095 m<sup>2</sup> |
| Answer» C. 0.0075 m<sup>2</sup> | |
| 12. |
A window having area of 2m^2 has a surface temperature of 15 C and the air is blowing at 2 C across it with convection heat transfer coefficient of h = 125 W/m2K. Find the total heat transfer loss? |
| A. | 3250 W |
| B. | 2250 W |
| C. | 4250 W |
| D. | 5250 W |
| Answer» B. 2250 W | |
| 13. |
Find the rate of conduction heat transfer through a 1.5 cm thick board(k = 0.16 W/m K), with a temperature difference of 20 C between the two sides. |
| A. | 113 W/m<sup>2</sup> |
| B. | 413 W/m<sup>2</sup> |
| C. | 313 W/m<sup>2</sup> |
| D. | 213 W/m<sup>2</sup> |
| Answer» D. 213 W/m<sup>2</sup> | |