Mechanical Engineering - Thermodynamics

16. 

Which of the following is the correct statement?

A. For a given compression ratio, both Otto and Diesel cycles have the same efficiency.
B. For a given compression ratio, Otto cycle is more efficient than Diesel cycle.
C. For a given compression ratio, Diesel cycle is more efficient than Otto cycle.
D. The efficiency of Otto or Diessel cycle has nothing to do with compressioin ratio.

Answer: Option B

Explanation:

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17. 

The temperature at which the volume of a gas becomes zero is called

A. absolute scale of temperature
B. absolute zero temperature
C. absolute temperature
D. none of these

Answer: Option B

Explanation:

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18. 

The heating of gas at constant volume is governed by

A. Boyle's law
B. Charles' law
C. Gay-Lussac law
D. Avogadro's law

Answer: Option C

Explanation:

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19. 

The absolute pressure of a given mass of a perfect gas varies inversely as its volume, when the temperature remains constant. This statement is known as Boyle's law.

A. Yes
B. No

Answer: Option A

Explanation:

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20. 

The fuel mostly used in cement industry and in metallurgical processes is

A. wood charcoal
B. bituminous coke
C. pulverised coal
D. coke

Answer: Option C

Explanation:

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