Exercise: Thermodynamics

Questions for: Thermodynamics

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: C
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The change of entropy, when heat is removed from the gas, is negative.
A:
Yes
B:
No
C:
D:
Answer: A
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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
C:
D:
Answer: A
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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: A
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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: A
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