Thermodynamics Questions and Answers – Diesel Cycle and Dual Cycle

This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on “Diesel Cycle and Dual Cycle”.

1. In SI engines,
a) air-fuel mixture is compressed
b) compression ratio is limited
c) both of the mentioned
d) none of the mentioned
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2. In CI engines,
a) during compression stroke, only air is compressed
b) compression ratios can be much higher
c) both of the mentioned
d) none of the mentioned
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3. The correct sequence of processes in CI engine is
a) intake->fuel injection and combustion->compression->expansion->exhaust
b) intake->compression->fuel injection and combustion->expansion->exhaust
c) intake->compression->expansion->fuel injection and combustion->exhaust
d) intake->compression->exhaust->fuel injection and combustion->expansion
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4. The processes in CI engine cycle is completed in ____ strokes of piston and ____ revolutions of crankshaft.
a) four, four
b) two, two
c) two, four
d) four, two
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5. The Diesel cycle consists of
a) two reversible isotherms and two reversible isobars
b) one reversible isochore and two reversible adiabatics and one reversible isobar
c) one reversible isotherm and two reversible isochores and one reversible isobar
d) two reversible isobars and two reversible adiabatics
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6. Which of the following is the relation between compression ratio, expansion ratio and cut-off ratio?
a) rc=(rk)*(re)
b) re=(rk)*(rc)
c) rk=(re)*(rc)
d) none of the mentioned
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7. The efficiency of Diesel cycle is ____ the efficiency of Otto cycle.
a) less than
b) greater than
c) equal to
d) none of the mentioned
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8. In Dual cycle,
a) all the heat is added at constant volume
b) all the heat is added at constant pressure
c) some heat is added at constant volume and remaining at constant pressure
d) none of the mentioned
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9. The constant volume pressure ratio is given by the ratio of pressures of constant volume heat addition.
a) true
b) false
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10. Detonation in SI engine is
a) noisy and destructive combustion phenomenon
b) limits the compression ratio
c) it depends on engine design and fuel
d) all of the mentioned
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11. The premature ignition of fuel is called ____
a) engine knock
b) auto-ignition
c) detonation
d) all of the mentioned
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12. The auto-ignition
a) reduces performance of engine
b) can cause damage to engine
c) sets upper limit to compression ratios used in SI engines
d) all of the mentioned
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13. Many a times, tetraethyl ether is added to gasoline.
a) true
b) false
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14. For a given compression raise, the highest efficiency can be obtained by using
a) triatomic gases
b) diatomic gases
c) monoatomic gases
d) all of the mentioned
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15. ɣ ____ with temperature.
a) increases
b) decreases
c) remains constant
d) none of the mentioned
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Sanfoundry Global Education & Learning Series – Thermodynamics.
To practice all areas of Thermodynamics, here is complete set of 1000+ Multiple Choice Questions and Answers.

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