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# Test: Thermodynamics Level - 4

## 25 Questions MCQ Test Mechanical Engineering SSC JE (Technical) | Test: Thermodynamics Level - 4

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This mock test of Test: Thermodynamics Level - 4 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam. This contains 25 Multiple Choice Questions for Mechanical Engineering Test: Thermodynamics Level - 4 (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Thermodynamics Level - 4 quiz give you a good mix of easy questions and tough questions. Mechanical Engineering students definitely take this Test: Thermodynamics Level - 4 exercise for a better result in the exam. You can find other Test: Thermodynamics Level - 4 extra questions, long questions & short questions for Mechanical Engineering on EduRev as well by searching above.
QUESTION: 1

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QUESTION: 2

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QUESTION: 3

### The term m Dh in a control volume equation Q – W = mDh

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QUESTION: 4

Select the Kelvin-Plank statement of the second law:

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QUESTION: 5

According to the Clausiu’s statement of the second law:
1. heat flows from cold surface to hot surface, unaided.
2. heat flows from hot surface to cold surface, unaided.
3. heat can flow from cold surface to hot surface with the aid of external work.
Which of the above statement is /are correct ?

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QUESTION: 6

The more effective way of increasing the efficiency of a carnot engine is to

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QUESTION: 7

Consider the following statements:
1. It is the second law of thermodynamics which provides criterion as to the probability of various processes.
2. Heat and work are completely interchangeable forms of energy.
3. Work is high grade energy.
4. The complete conversion of low grade energy into high grade energy in a cycle is impossible
Which of the above statements are correct ?

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QUESTION: 8

The four processes of the carnot cycle are

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QUESTION: 9

Perpetual motion machine of second kind violates the

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QUESTION: 10

The efficiency of the carnot cycle may be increased by

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QUESTION: 11

The unit of energy in S.I. units is

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QUESTION: 12

An engine operates between temperature limits of 900 K and T2 and another between T2 and 400 K for both to be equally efficient T2 will be equal to

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QUESTION: 13

For the same above engine, if work output is to be equal than T2 will be equal to

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QUESTION: 14

Three engines A, B and C operating on carnot cycle respectively use air, steam and Helium as the working fluid. If all the engine operates within the same temperature limit, then which engine will have highest efficiency

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QUESTION: 15

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

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QUESTION: 16

The pressure’of a gas in terms of its mean kinetic energy per unit volume E is equal to

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QUESTION: 17

Match List - I ( Laws of thermodynamics) with List -II (Defines) the following: Solution:
QUESTION: 18

The slope of constant pressure line on a T-S diagram is given by

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QUESTION: 19

In statistical thermodynamics, entropy is defined as
1. Measure of irreversibility of a system
2. A universal property
3. Degree of randomness
4. Thermodynamic probability of disorderness
Which of the above is/are correct ?

Solution:
QUESTION: 20

Consider the following statements: In an irreversible process
1. entropy always increases
2. the sum of the entropy of all bodies taking part in a process always increases
3. Once created, entropy can not be destroyed
Which among the above is /are correct ?

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QUESTION: 21

One kg of water at room temperature is brought into contact with a high temperature thermal reservoir. The entropy change of the universe is

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QUESTION: 22

For a thermodynamics cycle to be irreversible, it is necessary that

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QUESTION: 23

In a reversible cycle, the entropy of the system

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QUESTION: 24

The entropy change for any closed system which undergoes an irreversible adiabatic process

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QUESTION: 25

Consider two subsystem 1 and 2 containing same fluid and having same mass m; but at Temperature T1 and T2 (T1 > T2) enclosed in an adiabatic enclosure separate by a partition. If the partition is removed and the fluids are allowed to mix. The entropy change of process is

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