DIESEL CYCLE MULTIPLE CHOICE QUESTIONS (MCQ) WITH ANSWERS

 

DIESEL CYCLE MULTIPLE

CHOICE QUESTIONS (MCQ)

WITH ANSWERS   

It consists of two isentropic processes, one

isobaric and one at constant volume

processes. The sequence of processes is

as follows:

(i) Compression isentropic.

(ii) Supply of heat at constant pressure.

(iii) Expansion is isentropic.

(iv)  Rejection of heat at constant volume.

 It uses diesel fuel. Diesel cycle is a

compression cycle. Compression of air uses

a high compression ratio (11:1 to 20:1).

Inject Diesel into the compressed air. High

temperature compressed air ignites diesel.

Heavy vehicles like buses, trucks and

railways use Diesel cycle.

1. Diesel cycle consists of

1. Two isentropic and two isobaric processes

2. Two isothermal and two isobaric processes

3. Two isentropic and two isothermal processes

4. None

ANS: (iv)

2. Compression ignition cycle consists of

(i) Two adiabatic and two isothermal processes

(ii) Two isentropic and two constant volume processes

(iii) Two isobaric and two isothermal processes

(iv)None

ANS: (iv)

3. Heat addition in the Diesel cycle is at

(i) Constant temperature

(ii)  Pressure constant

(iii) Constant entropy

(iv)None

ANS: (ii)

4. Heat  addition in Diesel Cycle at

(i) Constant enthalpy

(ii) Volume constant

(iii) Isentropic

(iv) None

ANS: (iv)

5. Compression in an Diesel cycle is

• 1. Isobaric

  2. Isothermal

  3. Isenthalpic

  4. None

ANS: (iv)

6. Compression in an Diesel Cycle is

1. Isometric

2. Isentropic

3. Isobaric

4. None

ANS: (ii)

7. Heat rejected in an Diesel Cycle is

1. Isobaric

2. Isothermal

3. Isenthalpic

4. None

ANS: (iv)

8. Heat rejected in an Diesel Cycle is

1. Isometric

2. Isentropic

3. Isenthalpic

4. None

ANS; (i)

9. Expansion in an Diesel Cycle is

1. Isobaric

2. Iso-thermal

3. Iso-metric

4. None

ANS: (iv)

10. Expansion process in an Diesel Cycle is

1.  Volume constant

2. Iso- pressure

3. Constant entropy

4. None

ANS: (iii)

11. Efficiency of an Diesel Cycle is dependent of

1. Compression ratio

2. Cut off ratio

3. Compression ratio and cut off ratio

4. None

ANS: (iii)

12. Efficiency of an Diesel Cycle is independent of

1. Heat addition

2. Heat rejection

3. Properties of the working substance

4. None

ANS: (iv)

13. The expression for efficiency of Diesel Cycle is

1. 1-1/( γ-1)

2. 1+ 1/( γ-1)

3. 1 –γ/(γ-1)

4. None

ANS: (iv)

14. The expression of efficiency of the Diesel Cycle is

1. 1-1/r^{( γ-1)} [(α^γ -1) / γ(α – 1)]

2. 1+ 1/r^{( γ-1)} [(α^γ -1) / γ(α – 1)]

3. 1 –γ/r^(γ-1)

4. None

ANS: (i)

15. Diesel cycle is a

1. Carnot Cycle

2. Steam Cycle

3. Otto Cycle

4. None

ANS: (iv)

16. Diesel cycle is a

1. Petrol Cycle

2. Steam Cycle

3. Diesel Cycle

4. None

ANS: (iii)

17. Diesel cycle is

1. Compression Cycle

2. Otto Cycle

3. Spark ignition cycle

4. None

ANS: (i)

18. Fuel in a Diesel Cycle burns with

1. Compressed air

2.  Steam

3.  Both with compressed air & steam

4. None

ANS: (i)

19. Fuel in a Diesel Cycle burns with

1. Expansion of air

2.  Spark

3.  Heat addition

4. None

ANS: (iv)

20. For a high compression ratio, efficiency of Diesel cycle is

1. > efficiency of Otto cycle

2. < efficiency of Otto cycle

3. = efficiency of Otto cycle

4. None

ANS: (i)

21. Compression ratio in an Diesel Cycle is

1. 3:1 to 5:1

2. 7:1 to 10:1

3. 11:1 to 20:1

4. None

ANS : (iii)

22. Heat rejected in Diesel and Otto Cycles is

1. Isobaric

2. Isothermal

3. Isentropic

4. None

ANS: (iv)

23. Heat rejected in Diesel and Otto Cycles is

1. Isobaric

2. Isothermal

3. Isochoric

4. None

ANS: (iii)

https://www.mesubjects.net/wp-admin/post.php?post=6145&action=edit    Q. Answers internal Combustion engines