MCQ-DIESEL CYCLE

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MCQ

DIESEL CYCLE

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) Heat is supplied at constant pressure.

(iii) Expansion is isentropic.

(iv) Heat rejection is at constant volume.

It  uses diesel fuel. It is also called a compression cycle. In this only air is compressed with a high compression ratio (11:1 to 20:1).Fuel on injection gets ignited due to high temperature of compressed air. It is used in heavy vehicles like trucks, buses and railways.

MCQ-DIESEL CYCLE

  1. Diesel cycle consists of
  1. Two isentropic and two iso- baric processes
  2. Two iso-thermal and two iso-baric processes
  3. Two isentropic and two iso-thermal processes
  4. None

ANS: (iv)

  1. Diesel cycle consists of

(i) Two adiabatic and two iso-thermal processes

(ii) Two isentropic and two constant volume processes

(iii) Two isobaric and two iso-thermal processes

(iv)None

ANS: (iv)

  1. Heat is added in the Diesel cycle at

(i) Constant temperature

(ii) Constant pressure

(iii) Constant entropy

(iv)None

ANS: (ii)

4. Heat is added in Diesel Cycle at

(i) Constant enthalpy

(ii) Constant volume

(iii) Constant entropy

  • 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. Isometic
  2. Isentropic
  3. Iso-baric
  4. None

ANS: (ii)

7. Heat rejected in an Diesel Cycle is

  1. Isobaric
  2. Iso-thermal
  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. Constant volume
  2. Constant 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. Both compression 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 efficiency of the Diesel Cycle is given by

  1. 1-1/( γ-1)
  2. 1+ 1/( γ-1)
  3. 1 –γ/(γ-1)
  4. None

ANS: (iv)

14. The efficiency of the Diesel Cycle is given by

  1. 1-1/r( γ-1) [(αγ -1) / γ(α – 1)]
  2. 1+ 1/r( γ-1) [(αγ -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 is burnt with

  • Compression alone
  • With steam
  • With Diesel
  • None

ANS: (i)

19. Fuel in a Diesel Cycle is burnt with

  1. Expansion alone
  2. With a spark
  3. With heat addition
  4. None

ANS: (iv)

20. For the same compression ratio,

Efficiency of Diesel cycle is

  1. Greater than that of Otto cycle
  2. Less than that of Otto cycle
  3. Equal to that of Otto cycle
  4. None

ANS: (ii)

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 as well as in Otto Cycles is

  1. Isobaric
  2. Isothermal
  3. Isentropic
  4. None

ANS: (iv)

23. Heat rejected in Diesel as well as in Otto Cycles is

  1. Isobaric
  2. Isothermal
  3. Isochoric
  4. None

ANS: (iii)