Mechanical Engineering - Thermodynamics

1. 

For the same compression ratio, the efficiency of dual combustion cycle is

A. greater than Diesel cycle and less than Otto cycle
B. less than Diesel cycle and greater than Otto cycle
C. greater than Diesel cycle
D. less than Diesel cycle

Answer: Option A

Explanation:

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2. 

In an irreversible process, there is a

A. loss of heat
B. no loss of heat
C. gain of heat
D. no gain of heat

Answer: Option A

Explanation:

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3. 

The amount of heat required to raise the temperature of unit mass of a gas through one degree at constant pressure is called specific heat at constant pressure.

A. True
B. False

Answer: Option A

Explanation:

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4. 

The change of entropy, when heat is removed from the gas, is negative.

A. Yes
B. No

Answer: Option A

Explanation:

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5. 

Coke is produced

A. when coal is first dried and then crushed to a fine powder by pulverising machine
B. from the finely ground coal by moulding under pressure with or without a binding material
C. when coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel
D. by heating wood with a limited supply of air to a temperature not less than 280°C

Answer: Option C

Explanation:

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