# Carnot engine is irreversible due to

1.  Friction between moving parts

2.  Losses from working fluid in transit

3.  High speed

4.  Both (a) and (b)

4

Both (a) and (b)

Explanation :
No Explanation available for this question

# In Carton cycle, heat is rejected at constant

1.  Volume

2.  Pressure

3.  Temperature

4.  Entropy

4

Temperature

Explanation :
No Explanation available for this question

# The area of p-V diagram for a Carnot cycle represents

1.  Heat supplied

2.  Heat rejected

3.  Work done

4.   Temperature drop

4

Work done

Explanation :
No Explanation available for this question

# In Carnot cycle, if isothermal compression is continued bit longer than the normal, then adiabatic compression will cause steam to arrive at the inner dead centre at a temperature, which as compared to normal temperature is

1.  High

2.  Low

3.  Same

4.  None of these

4

Low

Explanation :
No Explanation available for this question

# In Carton cycle, the algebraic sum of the entropy changes for the cycle is

1.  Positive

2.  Negative

3.  Zero

4.  None of these

4

Zero

Explanation :
No Explanation available for this question

# In Carnot cycle, the process carried at extremely slow speed is

1.  Isothermal compression

4.  All of these

4

All of these

Explanation :
No Explanation available for this question

# For a reversed Cornet cycle, which figure represents the variation of TL for different values of COP for a constant value of TH = 300 K (say)

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# The availability per unit mass of a system, , in the absence of kinetic and potential energy changes is defined/calculated by

1.  Φ = maximum work obtainable when system goes to the dead state

2.  Φ = maximum useful work obtainable when system goes to the dead state

3.  Φ = (u – T0s) - (u0 – T0s0) + P0 (v – v0)

4.  Φ = (h – T0s) - (h0 – T0s0)

5.  Both (b) and (c)

5

Both (b) and (c)

Explanation :
No Explanation available for this question

# Ninety kilogram ice at 00 C are completely method. Find the entropy change, in kJ/K, if T2 = 00 C

1.  0

2.  45

3.  85

4.  105

4

105

Explanation :
No Explanation available for this question

# Which of the following system will have the highest efficiency for the conversion of heat, from the reservoirs, in to work

1.  Steam at 1000 C and water at 250 C

2.  Steam at 1500 C and water at 250 C

3.  Mercury vapour at 3570 C and liquid mercury at 1000 C

4.  Helium at 20000 C (from atomic reactor) and helium at 5000 C

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