MCQOPTIONS
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MCQOPTIONS
This section includes 3 Mcqs, each offering curated multiple-choice questions to sharpen your Thermodynamics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In a cryogenic experiment you need to keep a container at -125 C although it gains 100 W due to heat transfer. What is the smallest motor you would need for a heat pump absorbing heat from the container and rejecting heat to the room at 20 C? |
| A. | 97.84 kW |
| B. | 98.84 kW |
| C. | 99.84 kW |
| D. | 95.84 kW |
| Answer» B. 98.84 kW | |
| 2. |
A cyclic machine, as shown below, receives 325 kJ from a 1000 K energy reservoir. It rejects 125 kJ to a 400 K energy reservoir and the cycle produces 200kJ of work as output. Is this cycle reversible, irreversible, or impossible? |
| A. | reversible |
| B. | irreversible |
| C. | impossible |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 3. |
An air-conditioner provides 1 kg/s of air at 15 C cooled from outside atmospheric air at 35 C. Estimate the amount of power needed to operate the air-conditioner. |
| A. | 1.09 kW |
| B. | 1.19 kW |
| C. | 1.29 kW |
| D. | 1.39 kW |
| Answer» E. | |