Test: First Law of Thermodynamics - 1

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This mock test of Test: First Law of Thermodynamics - 1 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam. This contains 10 Multiple Choice Questions for Mechanical Engineering Test: First Law of Thermodynamics - 1 (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: First Law of Thermodynamics - 1 quiz give you a good mix of easy questions and tough questions. Mechanical Engineering students definitely take this Test: First Law of Thermodynamics - 1 exercise for a better result in the exam. You can find other Test: First Law of Thermodynamics - 1 extra questions, long questions & short questions for Mechanical Engineering on EduRev as well by searching above.

QUESTION: 1

In a cyclic process, heat transfer are +15.7 kJ, -26.2 kJ, -4.86 kJ and +31.5 kJ. What is the network for this cyclic process?

A.
15.14 kJ
B.
16.41 kJ
C.
16.14 kJ
D.
15.41 kJ

Solution:

QUESTION: 2

A stationary mass of gas is compressed without friction from an initial state of 0.3 m³ and 0.1 MPa to a final state of 0.15 m³ and 0.1 MPa, the pressure remaining constant during the process. There is a transfer of 40 kJ of heat from the gas during the process. What is the change in internal energy of the gas?

A.
-5 kJ
B.
+25 kJ
C.
-25 kJ
D.
+15 kJ

Solution:

= 0.1 χ 10⁶ (0.15-0.3)
= -15Kj
-25Kj

QUESTION: 3

An engine is tested by means of a water brake at 1000 rpm. The measured torque-of the engine is 10000 Nm and the water consumption of the brake is 0.5 m3/s, its inlet temperature being 25°C. Assuming that the whole of the engine power is ultimately transferred into heat which is absorbed by the cooling water, what is the water temperature at exit?

A.
22.5°C
B.
23.5°C
C.
24.5°C
D.
25.5°C

Solution:

Engine power,

QUESTION: 4

The first law of thermodynamics is the law of

A.
conservation of mass
B.
conservation of energy
C.
conservation of momentum
D.
conservation of temperature

Solution:

QUESTION: 5

The polytropic process is represented by a straight line in the following figure. What is X and Y respectively?

A.
In V and In P
B.
V and P
C.
In P and In V
D.
Pand V

Solution:

Correct Answer :- c

Explanation : PVⁿ + C

ln P + n ln V = C

X + nY = C

X/C + Y/(C/n) = 1

i.e. straight line

QUESTION: 6

A PMM1 is

A.
A thermodynamic machine
B.
A hypothetical machine
C.
A real machine
D.
A hypothetical machine whose operation would violate the first law of thermodynamic

Solution:

There can be no machine which would continuously supply mechanical work without some other form of energy disappearing simultaneously. It is fictitious machine.