| 1. | Which of the following factors does NOT contribute towards detonation in an engine ? | |
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Engine overheating
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High compression ratio
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Stoichiometric fuel mixture
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Wrong spark plug
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Report Question| 2. | Which of the following statement is TRUE for work output of an ideal Otto cycle ? | |
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Increases with an increase in adiabatic Index
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Increases with an increase in compression ratio
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Increases with an increase in pressure ratio
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All option are correct
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| 3. | Which below stated statement is TRUE about a reservoir of heat ? | |
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It has a variable temperature
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The heat exchange is reversible
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It has a finite heat capacity
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There exist no real heat reservoirs
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| 4. | If a heat engine produces work without the consumption of energy, then what kind of machine is this ? | |
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Perpetual motion machine of first kind (PMM1)
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Perpetual motion machine of second kind (PMM2)
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Perpetual motion machine of third kind (PMm³)
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None of these
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| 5. | In a P-T phase diagram of a pure substance, which of the following lines separates solid and liquid region ? | |
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Sublimation lines
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vaporization line
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Melting or fusion fine
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Triple point
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| 6. | What is the dryness fraction (x) of a saturated liquid-vapour mixture ? | |
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0
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1
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2
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Cannot be determined
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| 7. | A gas is compressed frictionless from an initial state of 0.4 m³ and 0.1 MPa to a final state of 0.2 m³ and 0.1 MPa. There is a transfer of 35 kJ of heat from the gas. What is the change in internal energy (in kJ) ? | |
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-55
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55
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-15
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15
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| 8. | What is the velocity of steam (in m/sec) at exit across a steam whistle which is perfectly insulated and does not perform any work and undergoes a drop of 0.2 kJ/kg in enthalpy from entry to exit ? | |
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10
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20
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30
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40
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| 9. | A heat engine performs a work of 100 kJ per cycle. The efficiency of the engine is 50%. What will be the amount of heat rejected (in kJ) per cycle ? | |
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0
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50
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100
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200
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| 10. | What happens during a throttling process ? | |
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Steam temperature remains constant
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Steam pressure remains constant
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Steam entropy remains constant
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Steam enthalpy remains constant
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