MCQOPTIONS
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MCQOPTIONS
This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Thermodynamics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Identify the incorrect statement, from the following options:Irreversibility is introduced into the desired isentropic compression in an air compressor by _____. |
| A. | Heat loss from compressor walls |
| B. | Rapid compression |
| C. | Mechanical losses in bearings |
| D. | Friction between air and cylinder walls |
| Answer» D. Friction between air and cylinder walls | |
| 2. |
An amount of 1000 kJ of heat is added to a system during a constant pressure vapourization process at a temperature of 227°C. The available energy added to the system, if the temperature of the surrounding is 27°C, is |
| A. | 600 kJ |
| B. | 500 kJ |
| C. | 400 kJ |
| D. | 300 kJ |
| Answer» D. 300 kJ | |
| 3. |
Consider the following statements regarding availability:1) Is generally conserved2) It can either be negative or positive3) It is the maximum theoretical work obtainable4) It can be destroyed in irreversibilityWhich of the above statements are correct? |
| A. | 3 and 4 |
| B. | 1 and 2 |
| C. | 1 and 3 |
| D. | 2 and 4 |
| Answer» B. 1 and 2 | |
| 4. |
100 kJ of energy is transferred from a heat reservoir at 1000 K to a heat reservoir at 500 K. The ambient temperature is 300 K. The loss of available energy due to heat transfer process is |
| A. | 20 kJ |
| B. | 30 kJ |
| C. | 40 kJ |
| D. | 50 kJ |
| E. | 60 kJ |
| Answer» C. 40 kJ | |
| 5. |
An ideal gas is throttled through an insulated pipe at the rate of 3 kg/s. There is a 10% pressure drop from an inlet to exit of the pipe. The values of R = 0.287 kJ/kgK and T0 = 300 K. The rate of energy loss for the pressure drop due to friction, will be nearly |
| A. | 34 kW |
| B. | 30 kW |
| C. | 26 kW |
| D. | 22 kW |
| Answer» D. 22 kW | |