The efficiency of Diesel cycle approaches to Otto cycle efficiency when  A. cut-off is increased  B. cut-off is decreased  C. cut-off is zero  D. cut-off is constant

The efficiency of Diesel cycle approaches to Otto cycle efficiency when  A. cut-off is increased  B. cut-off is decreased  C. cut-off is zero  D. cut-off is constant
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Answer: C
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When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.  A. zero  B. 1/5  C. 4/5  D. 1

Description : When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.  A. zero  B. 1/5  C. 4/5  D. 1

Last Answer : Answer: A

Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle  A. combustion is at constant volume  B. expansion and compression are isentropic  C. maximum temperature is higher  D. heat rejection is lower

Description : Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle  A. combustion is at constant volume  B. expansion and compression are isentropic  C. maximum temperature is higher  D. heat rejection is lower

Last Answer : Answer: D

For same compression ratio and for same heat added  (a) Otto cycle is more efficient than Diesel cycle  (b) Diesel cycle is more efficient than Otto cycle  (c) efficiency depends on other factors  (d) both Otto and Diesel cycles are equally efficient  (e) none of the above.

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Last Answer : Answer : a

The efficiency of Diesel cycle increases with  A. decrease in cut-off  B. increase in cut-off  C. constant cut-off  D. none of these

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Last Answer : Answer: A

A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as  A.Carnot cycle  B.Stirling cycle  C.Otto cycle  D.Diesel cycle

Description : A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as  A.Carnot cycle  B.Stirling cycle  C.Otto cycle  D.Diesel cycle

Last Answer : Answer: D

The efficiency of Diesel cycle depends upon  A. temperature limits  B. pressure ratio  C. compression ratio  D. cut-off ratio and compression ratio

Description : The efficiency of Diesel cycle depends upon  A. temperature limits  B. pressure ratio  C. compression ratio  D. cut-off ratio and compression ratio

Last Answer : Answer: D

Gasoline and Diesel Engines are best described by the _________.  a. Otto Cycle  b. Burnign Cycle  c. Shikki Cycle  d. Shapa R’ Elli Cycle

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Last Answer : Otto Cycle

The most efficient cycle that can operate between two constant temperature reservoir is the _________.  a. Otto Cycle  b. Lazare Cycle  c. Isothermal Cycle  d. Carnot Cycle

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Otto cycle is also known as  A. constant pressure cycle  B. constant volume cycle  C. constant temperature cycle  D. constant temperature and pressure cycle

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Last Answer : Answer: B

A cycle consisting of two adiabatics and two constant pressure processes is known as  (a) Otto cycle  (b) Ericsson cycle  (c) Joule cycle  (d) Stirling cycle  (e) Atkinson cycle.

Description : A cycle consisting of two adiabatics and two constant pressure processes is known as  (a) Otto cycle  (b) Ericsson cycle  (c) Joule cycle  (d) Stirling cycle  (e) Atkinson cycle.

Last Answer : Answer : c

Otto cycle consists of following four processes  (a) two isothermals and two isentropics  (b) two isentropics and two constant volumes  (c) two isentropics, one constant volume and one constant pressure  (d) two isentropics and two constant pres-sures  (e) none of the above.

Description : Otto cycle consists of following four processes  (a) two isothermals and two isentropics  (b) two isentropics and two constant volumes  (c) two isentropics, one constant volume and one constant pressure  (d) two isentropics and two constant pres-sures  (e) none of the above.

Last Answer : Answer : b

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Last Answer : Gasoline engine

The efficiency of a dual combustion cycle __________ upon cut-off ratio.  A. depends  B. does not depend

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Last Answer : Answer: A

The efficiency of Diesei cycle with decrease in cut off  (a) increases  (b) decreases  (c) remains unaffected  (d) first increases and then decreases  (e) first decreases and then increases.

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Last Answer : Answer : a

Carnot cycle has maximum efficiency for  (a) reversible engine  (b) irreversible engine  (c) new engine  (d) petrol engine  (e) diesel engine.

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Last Answer : Answer : a

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An ideal gas is maintained at constant temperature. If the pressure on the gas is doubled, the volume is  a. increased fourfold  b. doubled  c. reduced by half  d. decreased by a quarter

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Last Answer : reduced by half

It is used for gas turbines which operates on an open cycle where both the compression and expansion processes take place in rotating machinery.  a. Dual Cycle  b. Otto Cycle  c. Carnot Cycle  d. Brayton Cycle

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Last Answer : Rankine cycle

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Last Answer : Answer : c

Diesel cycle consists of following four processes  (a) two isothermals and two isentropics  (b) two isentropics, and two constant volumes.  (c) two isentropics, one constant volume and one constant pressure  (d) two isentropics and two constant pressures  (e) none of the above.

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Last Answer : Answer : c

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What states that thermal efficiencies of all reversible heat engines operating between the same two reservoirs are the same and that no heat engine is more efficient than a reversible one operating between the same two reservoirs?  A. Ericson principle  B. Carnot principle  C. Otto principle  D. Stirling principle

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Last Answer : Carnot principle

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Last Answer : Answer: B

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Last Answer : Answer: C

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Last Answer : Answer: B

The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will  (a) increase  (b) decrease  (c) remain unchanged  (d) increase/decrease depending on ap-plication  (e) unpredictable. “

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Last Answer : Answer : b

If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle  (a) more  (b) less  (c) equal  (d) depends on other factors  (e) none of the above.

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Last Answer : Answer : c

The efficiency of Carnot cycle is maximum for  (a) gas engine  (b) well lubricated engine  (c) petrol engine  (d) steam engine  (e) reversible engine.

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Last Answer : Answer : e

An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is  (a) feasible  (b) impossible  (c) possible  (d) possible, but with lot of sophistications  (e) desirable.

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Last Answer : Answer : d

Carnot cycle efficiency is maximum when  (a) initial temperature is 0°K  (b) final temperature is 0°K  (c) difference between initial and final temperature is 0°K  (d) final temperature is 0°C  (e) initial temperature is minimum possible.

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Last Answer : Answer : b

Carnot cycle efficiency depends upon  (a) properties of the medium/substance used  (b) condition of engine  (c) working condition  (d) temperature range of operation  (e) effectiveness of insulating material around the engine.

Description : Carnot cycle efficiency depends upon  (a) properties of the medium/substance used  (b) condition of engine  (c) working condition  (d) temperature range of operation  (e) effectiveness of insulating material around the engine.

Last Answer : Answer : d

The more effective way of increasing efficiency of Carnot engine is to  (a) increase higher temperature  (b) decrease higher temperature  (c) increase lower temperature  (d) decrease lower temperature  (e) keep lower temperature constant.

Description : The more effective way of increasing efficiency of Carnot engine is to  (a) increase higher temperature  (b) decrease higher temperature  (c) increase lower temperature  (d) decrease lower temperature  (e) keep lower temperature constant.

Last Answer : Answer : d

If a system after undergoing a series of processes, returns to the initial state then  (a) process is thermodynamically in equilibrium  (b) process is executed in closed system cycle  (c) its entropy will change due to irreversibility  (d) sum of heat and work transfer will be zero  (e) no work will be done by the system.

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Last Answer : Answer : d

The dual combustion cycle consists of one constant pressure, two constant volume and two isentropic processes.  A. Agree  B. Disagree

Description : The dual combustion cycle consists of one constant pressure, two constant volume and two isentropic processes.  A. Agree  B. Disagree

Last Answer : Answer: A

Ericsson cycle consists of two constant pressure and two isothermal processes.  A. Agree  B. Disagree

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Last Answer : Answer: A

Gas turbine cycle consists of  (a) two isothermals and two isentropics  (b) two isentropics and two constant volumes  (c) two isentropics, one constant volume and one constant pressure  (d) two isentropics and two constant pressures  (e) none of the above.

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Last Answer : Answer : d

Brayton cycle consists’ of following four processes  (a) two isothermals and two isentropics  (b) two isentropics and two constant volumes  (c) two isentropics, one constant volume and one constant pressure  (d) two isentropics and two constant pres-sures  (e) none of the above.

Description : Brayton cycle consists’ of following four processes  (a) two isothermals and two isentropics  (b) two isentropics and two constant volumes  (c) two isentropics, one constant volume and one constant pressure  (d) two isentropics and two constant pres-sures  (e) none of the above.

Last Answer : Answer : d

In a Carnot cycle, heat is transferred at  (a) constant pressure  (b) constant volume  (c) constant temperature  (d) constant enthaply  (e) any one of the above.

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Last Answer : Answer : c

An ideal gas is compressed in a cylinder so well insulated that there is essentially no heat transfer. The temperature of gas  a. Remains constant  b. increases  c. decreases  d. is basically zero

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Last Answer : increases

What happens to the internal energy of water at reference temperature where enthalpy is zero?  a. Becomes negative  b. Becomes positive  c. Remains constant  d. Cannot be defined

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Last Answer : Becomes negative

The gas in a constant gas thermometer cooled to absolute zero would have _________.  a. no volume  b. no pressure  c. zero temperature at all scales  d. none of the above

Description : The gas in a constant gas thermometer cooled to absolute zero would have _________.  a. no volume  b. no pressure  c. zero temperature at all scales  d. none of the above

Last Answer : no pressure

Work done is zero for the following process  (a) constant volume  (b) free expansion  (c) throttling  (d) all Of the above  (e) none of the above.

Description : Work done is zero for the following process  (a) constant volume  (b) free expansion  (c) throttling  (d) all Of the above  (e) none of the above.

Last Answer : Answer : d

If a gas is heated against a pressure, keeping the volume constant, then work done will be equal to  (a) + v  (b) – ve  (c) zero  (d) pressure x volume  (e) any where between zero and infinity.

Description : If a gas is heated against a pressure, keeping the volume constant, then work done will be equal to  (a) + v  (b) – ve  (c) zero  (d) pressure x volume  (e) any where between zero and infinity.

Last Answer : Answer : c

A diesel engine is usually more efficient than a spark ignition engine because a. Diesel being a heavier hydrocarbon, release more heat per kg than gasoline b. The air standard efficiency of diesel cycle is higher than the Otto cycle, at a fixed compression ratio c. The compression ratio of a diesel engine is higher than that of an Spark ignition engine d.Self ignition temperature of diesel is higher than that of gasoline.

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Last Answer : ANSWER c. The compression ratio of a diesel engine is higher than that of an S.I engine

For same compression ratio a. Diesel cycle has lower efficiency than Otto cycle b. Diesel cycle has higher efficiency than Otto cycle c. Diesel cycle and Otto cycle have equal efficiencies d. Depends upon the load on engine

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Last Answer : Answer a. Diesel cycle has lower efficiency than Otto cycle

Compare the efficiency of Otto cycle and diesel cycle for same maximum pressure with neat sketch.

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Last Answer : Comparison of efficiency of Otto Cycle and Diesel cycle for same pressure ration and same conditions The air-standard Otto and Diesel cycles are drawn on common p-v and T-s diagrams for the same pressure ... for the same pressure ratio Qs(diesel) > Qs(otto) Thus , diesel > otto