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Thermodynamics Questions and Answers

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Exercise

Exercise 1
Exercise 2
Exercise 3
Exercise 4
Exercise 5
Exercise 6

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Q 1
Carbonisation of coal consists of

A) drying and crushing the coal to a fine powder

B) moulding the finely ground coal under pressure with or without a binding material

C) heating the wood with a limited supply of air to temperature not less than 280°C

D) none of the above

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Correct Option - D

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Q 2
The behaviour of a perfect gas, undergoing any change in the variables which control physical properties, is governed by

A)   Boyle's law

B)   Charles' law

C)   Gay-Lussac law

D)   all of these

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Correct Option - D

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Q 3
When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.

A)   zero

B)   1/5

C)   4/5

D)   1

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Correct Option - A

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Q 4
The value of gas constant (R) in S. I. units is

A)   0.287 J/kgK

B)   2.87 J/kgK

C)   28.7 J/kgK

D)   287 J/kgK

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Correct Option - D

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Q 5
The specific heat of water is

A)   1.817

B)   2512

C)   4.187

D)   none of these

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Correct Option - C

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Q 6
Workdone in a free expansion process is

A)   zero

B)   minimum

C)   maximum

D)   positive

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Correct Option - A

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Q 7
The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and recondensed, then the liquid with the next higher boiling point is then evaporated and recondensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called

A)   cracking

B)   carbonisation

C)   fractional distillation

D)   full distillation

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Correct Option - C

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