MCQOPTIONS
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MCQOPTIONS
This section includes 15 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_THE_EXPANSION_PROCESS,_WHICH_OF_THE_FOLLOWING_REMAINS_CONSTANT??$ |
| A. | work done |
| B. | heat supplied |
| C. | internal energy |
| D. | enthalpy |
| Answer» E. | |
| 2. |
One tonne of refrigeration is given as the rate of heat removal from surroundings equivalent to heat required for melting one tonne of ice in a day.$ |
| A. | true |
| B. | false |
| Answer» B. false | |
| 3. |
The COP of cycle is given by(Q2=heat absorbed by evaporator and Wc=work done by compressor)$ |
| A. | 1- (Q2/Wc) |
| B. | 1- (Wc/Q2) |
| C. | Q2/Wc |
| D. | Wc/Q2 |
| Answer» D. Wc/Q2 | |
| 4. |
A condenser must ____ and then ____ the compressed refrigerant. |
| A. | superheat, evaporate |
| B. | desuperheat, evaporate |
| C. | superheat, condense |
| D. | desuperheat, condense |
| Answer» E. | |
| 5. |
Superheating of vapour and subcooling of liquid ____ the refrigerating effect. |
| A. | decreases |
| B. | increases |
| C. | no change |
| D. | none of the mentioned |
| Answer» C. no change | |
| 6. |
Which of the following is recommended in a refrigeration cycle? |
| A. | superheating of vapour |
| B. | subcooling of liquid |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 7. |
The evaporator produces the cooling or refrigerating effect? |
| A. | true |
| B. | false |
| Answer» B. false | |
| 8. |
The evaporation process is a |
| A. | constant volume reversible process |
| B. | constant pressure reversible process |
| C. | adiabatic throttling process |
| D. | reversible adiabatic process |
| Answer» C. adiabatic throttling process | |
| 9. |
The expansion process is |
| A. | isentropic |
| B. | reversible |
| C. | adiabatic |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 10. |
In the cooling and condensing, correct sequence of processes is |
| A. | desuperheated->condensed->saturated liquid |
| B. | desuperheated->saturated liquid->condensed |
| C. | condensed->desuperheated->saturated liquid |
| D. | saturated liquid->condensed->desuperheated |
| Answer» B. desuperheated->saturated liquid->condensed | |
| 11. |
Why is wet compression not preferred? |
| A. | the liquid refrigerant can be trapped in the head of cylinder |
| B. | this may damage the valves or cylinder head |
| C. | liquid refrigerant can wash away the lubricating oil thus accelerating wear |
| D. | all of the mentioned |
| Answer» E. | |
| 12. |
Wet compression is preferred over dry compression. |
| A. | true |
| B. | false |
| Answer» C. | |
| 13. |
Compression can be |
| A. | dry compression |
| B. | wet compression |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 14. |
Which of the following operations occur in a vapour refrigeration cycle? |
| A. | compression |
| B. | cooling and condensing |
| C. | expansion and evaporation |
| D. | all of the mentioned |
| Answer» E. | |
| 15. |
In vapour refrigeration cycle, which of the following is used for expansion? |
| A. | expansion engine |
| B. | throttling valve or capillary tube |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» C. both of the mentioned | |