One kilo mole of an ideal gas is throttled from an initial pressure of 0.5 MPa to k0.1 MPa. The initial temperature is 300 K. The entropy change of the universe is

1.  13.38 kJ/K

2.  4014.3 kJ/K

3.  0.4621 kJ/K

4.  - 0.0446 kJ/K

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4
Correct Answer :

0.4621 kJ/K


Explanation :
No Explanation available for this question

A heat reservoir at 900 K is brought in to contact with the ambient at 300 K for a short time. During this period 9000 kJ of heat is lost by the heat reservoir. The total loss in availability due to this process is

1.  18000 kJ

2.  9000 kJ

3.  6000 kJ

4.  None of these

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4
Correct Answer :

6000 kJ


Explanation :
No Explanation available for this question

For an ideal gas the expression  is always equal to

1.  Zero

2.  Cp/Cv

3.  R

4.  RT

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4
Correct Answer :

R


Explanation :
No Explanation available for this question

A system undergoes a state change from 1 to 2. According to the second law of thermodynamics for the process to be feasible, the entropy change, S2 – S1­ of the system

1.  Is positive or zero

2.  Is negative or zero

3.  Is zero

4.  Can be positive, negative or zero

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4
Correct Answer :

Can be positive, negative or zero


Explanation :
No Explanation available for this question

A rectangular machine working on Reversed Carnot cycle takes out 2 kW per minute of heat from the system while working between temperatures limits of 300 K and 200 K. COP and power consumed by the cycle will be

1.  1, 1 kW

2.  1, 2 kW

3.  2, 1 kW

4.  2, 2 kW

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4
Correct Answer :

2, 1 kW


Explanation :
No Explanation available for this question

Joule Thomson coefficient for an ideal gas having equation pV = RT is

1.  Zero

2.  0.5

3.  Unity

4.  Infinite

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4
Correct Answer :

Zero


Explanation :
No Explanation available for this question

For a heat engine operating on Carnot cycle, the work output is 1/4 th of the heat transferred to the cold system. The efficiency of the engine is

1.  20 %

2.  25 %

3.  75 %

4.  80 %

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4
Correct Answer :

20 \%


Explanation :
No Explanation available for this question

In a cycle heat engine operating between a source temperature of 6000 C and a sink temperature of 200 C, the least rate of heat rejection per kW net output of the engine is

1.  0.460 kW

2.  0.505 kW

3.  0.588 kW

4.  0.650 kW

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4
Correct Answer :

0.505 kW


Explanation :
No Explanation available for this question

If a heat engine gives an output of 3 kW when the input is 10000 J/s, then thermal efficiency of the engine will be

1.  20 %

2.  30 %

3.  70 %

4.  76.7 %

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4
Correct Answer :

30 \%


Explanation :
No Explanation available for this question

A heat engine is supplied with 250 kJ/s of heat at a constant fixed temperature of 2270 C. The heat is rejected at 270 C. The cycle is reversible, if the amount of heat rejected is

1.  273 kJ/s

2.  200 kJ/s

3.  180 kJ/s

4.  150 kJ/s

View Answer  
4
Correct Answer :

150 kJ/s


Explanation :
No Explanation available for this question
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