The efficiency of an autmobile engine is 20% and it operates at 90 cycle per second. If it work at the rate of 120 hp, how much heat does the engine absorb per cycle?
4973 J
4450 J
4282 J
4000 J
The rise in temperature when a gas is compressed suddenly to half of its original volume is_________
(Assume original temperature was 27oC and having = 1.5)
114.5oC
125oC
124.2oC
147.1oC
At absolute temperature, value of specific heats (Cp and Cv) is
Maximum
Zero
Minimum
None of the above
For a cyclic process the change in the internal energy of the system is
One
Zero
Maximum
Negative
A process in which a fluid at a constant high pressure seeps through a porous wall into a region of constant lower pressure without transfer of heat is called
Isobaric process
Throttling process
Adiabatic process
Isochoric process
An irreversible process occurring isothermally in an isolated system leads to ____.
Zero entropy
An increase in the total entropy of the system
A decrease in the total entropy of the system
None of the above
One mole of an ideal gas at is expanded isothermally from an initial volume of 1 litre to 10 liters. The change in energy for this process is ____.
163.7 cal
850.2 cal
1381.1 cal
Zero
If 0.75 mole of an ideal gas expands isothermally at from 15 liters to 25 liters, the maximum work obtained is ____.
8.40 J
9.34 J
10.86 J
10.43 J
An engine operating between and takes 500 J heat from a higher temperature reservoir if there are no frictional losses, and then work done by engine is ____.
147.7 J
157.75 J
165.85 J
169.95 J
The volume of a gas decreases from to when a sample of gas is compressed by an average pressure of 0.6 atm. During this process 10 J of heat is liberated. The change in internal energy is ____.
– 2.16 J
12.156 J
2.16 J
101.3 J