Mechanical Engineering - Thermodynamics

6. 

The air standard efficiency of an Otto cycle is given by (where r = Compression ratio, and γ = Ratio of specific heats)

A. 1 - rγ - 1
B. 1 + rγ - 1
C.
D.

Answer: Option C

Explanation:

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7. 

In an ideal gas turbine plant, it is assumed that the compression and expansion processes are

A. isothermal
B. isentropic
C. polytropic
D. none of these

Answer: Option B

Explanation:

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8. 

When gas is heated at constant pressure, the heat supplied is utilised in

A. increasing the internal energy of gas
B. doing some external work
C. increasing the internal energy of gas and also for doing some external work
D. none of the above

Answer: Option C

Explanation:

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9. 

The amount of heat required to raise the temperature of 1 kg of water through one Kelvin is called

A. specific heat at constant volume
B. specific heat at constant pressure
C. kilo-Joule
D. none of these

Answer: Option C

Explanation:

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10. 

When wood is heated with a limited supply of air to a temperature not less than 280°C, the resulting fuel is

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

Answer: Option B

Explanation:

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