How is the heat added in the Diesel cycle?

Study the following table: June 2007 December 2014 Price of petrol in Rs/litre 47.74 61.33 Price of diesel in Rs/litre 35.21 50.51 After studying the above table, Devmeet a class V student wrote the following in his notebook: A. Petrol is more expensive fuel than diesel. B. The percentage increase in the price of diesel is more than that of petrol. C. Diesel is cheaper and that is why public transport runs on it. D. Diesel is cheaper fuel than petrol. People should buy diesel vehicles. Which one of the following is correct?

A

C and D are inferences

B

A and D are observations

C

A and C are observations

D

B and C are inferences

Group I shows different heat addition processes in power cycles. Likewise, Group II shows different heat removal processes. Group III lists power cycles. Match items from Groups I, II and III. Group I Group II Group III P. Pressure constant S. Pressure constant 1. Rankine cycle Q. Volume constant T. Volume constant 2. Otto cycle R. Temperature constant U. Temperature constant 3. Carnot cycle 4. Diesel cycle 5. Brayton cycle

A

P – S – 5, R – U – 3, P – S – 1, Q – T - 2

B

P – S – 1, R – U – 3, P – S – 4, P – T - 2

C

R – T – 3, P – S – 1, P – T – 4, Q – S - 5

D

P – T – 4, R – S – 3, P – S – 1, P – S - 5

Consider the following statements: 1. Both Otto and Diesel cycles are special cases of dual combustion cycle 2. Combustion process in IC engines is neither fully constant volume nor fully constant pressure process 3. Combustion process in ideal cycle is replaced by heat addition from internal source in closed cycle 4. Exhaust process is replaced by heat rejection in ideal cycle Which of the above statements are correct?

A

1, 2 and 3 only

B

3 and 4 only

C

1, 2 and 4 only

D

1, 2, 3 and 4

Consider the following statements: 1. The air standard efficiency of an Otto cycle is a function of the properties of the working substance (gas) 2. For the same compression ratio and same input, the thermal efficiency of an Otto cycle is more than that of a Diesel cycle 3. Thermal efficiency of a Diesel cycle increases with decrease of cut-off ratio Which of the above statements are correct?

A

1 and 2 only

B

1 and 3 only

C

2 and 3 only

D

1, 2 and 3

Two statements and a few problems are given. Which of the following problems can be solved through these statements? Statement I: A container contains 28L mixture of diesel and petrol. Statement II: The ratio of diesel to petrol is 3 : 1 and 28L of Petrol is added to the container. Problem 1: What is the quantity petrol in the container before petrol is added? Problem 2: What is the ratio of diesel to Petrol in the final mixture? Problem 3: What is the cost of Petrol in the mixture if total cost of mixture is Rs.1500?

A

Only problem 1 can be solved

B

Only problem 2 can be solved

C

Only 1 & 2 can be solved

D

None of them can be solved

E

All 1, 2 & 3 can be solved

Once a study was conducted about the impact of inflation on the prices of petrol and diesel. It has been observed during recent survey that the price of diesel increases by 40 paise every year. Apart from that it is been also observed that the price of petrol also increases by 15 paise every year. If in 2016, the price of petrol was Rs. 65.30 and that of diesel was Rs. 53.70, after how many years will diesel cost 40 paise more than the petrol?

A

70

B

48

C

23

D

40

E

55

A Carnot heat engine receives heat at 750 K and rejects the waste heat to the environment at 300 K. The net work output of the heat engine is used to drive a Carnot refrigerator, whose COP is 6.14. If the heat removal rate from the refrigerated space is 6.6 kW, determine the rate of heat supply to the heat engine?

A

2.79 kW

B

1.79 kW

C

4.79 kW

D

7.79 kW

Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle

A

Heat rejection is lower

B

Expansion and compression are isentropic

C

Combustion is at constant volume

D

Maximum temperature is higher

For the same heat input & compression ratio, efficiency of Otto cycle is higher than that of diesel cycle, because in Otto cycle.

A

Heat rejection is lower

B

Expansion & compression are isentropic

C

Maximum temperature is higher

D

Combustion is at constant volume

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

Otto Cycle		Constant volume heat addition. Constant volume heat rejection.
Carnot Cycle	Constant temperature heat addition Constant temperature heat rejection
Diesel Cycle	Constant pressure heat addition. Constant volume heat rejection.
Dual Cycle	Constant volume and constant pressure heat addition. Constant volume heat rejection

How is the heat added in the Diesel cycle?

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