Which factor leads to lower thermal efficiency of an actual Otto cycle in comparison of ideal Otto cycle?

Increase in specific heat ratio of working fluid with rise in temperature.
Decrease in specific heat ratio of working fluid with rise in temperature.
Decrease in specific heat of working fluid with rise in temperature.
No change in specific hear with change in temperature.

LohaHridoy

8 views

2025-01-04 04:42

1 Answers

AhmedNazir

Option 2 : Decrease in specific heat ratio of working fluid with rise in temperature.

Explanation:

A decrease in the specific heat ratio of working fluid with the rise in temperature leads to the lower thermal efficiency of an actual otto cycle in comparison to the ideal Otto cycle.
The actual Otto cycle is less efficient than the ideal Otto cycle because in an actual cycle-specific heat ratio decreases as temperature increases while in the ideal cycle it is assumed to remain constant.

[ alt="F6 Savita Engineering 27-4-22 D3" src="//storage.googleapis.com/tb-img/production/22/05/F6_Savita_Engineering_27-4-22_D3.png" style="width: 535px; height: 385px;">

Actual suction: In actual, suction will take place only if the pressure inside the cylinder is less than atmospheric pressure.

[ alt="F6 Savita Engineering 27-4-22 D4" src="//storage.googleapis.com/tb-img/production/22/05/F6_Savita_Engineering_27-4-22_D4.png" style="width: 243px; height: 268px;">

Actual compression: In actual, compression is not an adiabatic process, hence extra compression work is required to compensate for the heat loss to the water jacket.

[ alt="F6 Savita Engineering 27-4-22 D5" src="//storage.googleapis.com/tb-img/production/22/05/F6_Savita_Engineering_27-4-22_D5.png" style=" width: 225px; height: 155px;">

Actual heat addition: In actual, heat addition begins when the spark begins and ends at the ignition end of the last flame front and it requires minimum piston displacement.

[ alt="F6 Savita Engineering 27-4-22 D6" src="//storage.googleapis.com/tb-img/production/22/05/F6_Savita_Engineering_27-4-22_D6.png" style="width: 418px; height: 212px;">

Actual expansion:

[ alt="F6 Savita Engineering 27-4-22 D7" src="//storage.googleapis.com/tb-img/production/22/05/F6_Savita_Engineering_27-4-22_D7.png" style=" width: 221px; height: 166px;">

8 views Answered 2022-09-04 04:29

Related Questions

In the question below are given three statements followed by four conclusions numbered I, II, III, IV. You have to take the given statements to be true even if they seem to be at variance with commonly known facts. Read all the conclusions and then decide which of the following conclusions logically follows from the given statements disregarding commonly known facts. Statements: All sands are golds. No silver is a gold. Some silvers are leads. Conclusions: I) No sand is a gold. II) Some leads are not golds. III) Some sands are silvers. IV) Some leads are sand.?

1 Answers 5 Views

The type of signalling system in which it is possible to vary the length of cycle, cycle division and the time schedule at each signal point is called?

1 Answers 5 Views

Workability of concrete can be measured using slump, compaction factor and Vee-bee time. Consider the following statements for workability of concrete: (i) As the slump increases, the Vee-bee time increases. (ii) As the slump increases, the compaction factor increases. Which of the following is TRUE?

1 Answers 6 Views

Which one of the following is NOT a necessary assumption for the air-standard Otto cycle ?

1 Answers 5 Views

Which combination of the following statements is correct The incorporation of reheater in a steam power plant: P: always increases the thermal efficiency of the plant. Q: always increases the dryness fraction of steam at condenser inlet. R: always increases the mean temperature of heat addition. S: always increases the specific work output.?

1 Answers 5 Views

A synchronous motor on load draw a current at a leading power factor angle ϕ. If the internal power factor angle which is the phase angle between the excitation emf and the current in the time phasor diagram is ψ. Then the air gap excitation mmf lags the armature mmf by?

1 Answers 40 Views

Find out which part has an error and mark it as your answer. If there is no error, mark ‘No error’ as your answer. India's social indicators were far from flatter (A)as can be concluded from lower life expectancy, higher child mortality rate(B), and further lower levels of sanitation and child nutrition. (C)No Error(D)?

1 Answers 5 Views

Which device is employed to reduce the power factor in the case of the leading power factor in the transmission line 1. Synchronous condenser 2. SVC 3. Reactor?

1 Answers 5 Views

Which is/are not the correct statements for hydroelectric power plant (a) Cost of electricity generation is affected by load factor. (b) Useful life is lower than thermal power plant. (c) Operating cost is low. (d) Quickly respond to change in load.?

1 Answers 5 Views

Which of the following is correct for the ideal vapour-compression refrigeration cycle?

1 Answers 4 Views

এক্সাম দিয়ে মেধা যাচাই করুন

Job Preparation (1125)

Admission (754)

এসএসসি (10)

এইচএসসি (5)