# 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

4

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

4

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

4

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

4

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

4

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

4

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 %

4

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

4

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 %

4

30 \%

Explanation :
No Explanation available for this question

1.  273 kJ/s

2.  200 kJ/s

3.  180 kJ/s

4.  150 kJ/s

4