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This mock test of Test: Work & Heat Transfer - 1 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam.
This contains 10 Multiple Choice Questions for Mechanical Engineering Test: Work & Heat Transfer - 1 (mcq) to study with solutions a complete question bank.
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QUESTION: 1

A closed system receives 60 kJ heat but its internal energy decreases by 30 kJ, Then the work done by the system is

Solution:

QUESTION: 2

If the work done on a closed system is 20 kJ/kg, and 40 kJ/kg heat is rejected from the system, its internal energy decreases by

Solution:

As per first law of thermodynamics:

QUESTION: 3

The integrating factor of quasi-static displacement work is

Solution:

Quasistatic work,

An inexact different dW when multiplied by an integrating factor 1/P becomes an exact differential dV.

(Point function) = (Integrating factor) x (Path function)

QUESTION: 4

The integrating factor of reversible heat transfer is

Solution:

QUESTION: 5

Heat transferred to a closed stationary system at constant volume is equal to

Solution:

QUESTION: 6

Which among the following is not a boundary phenomenon?

Solution:

QUESTION: 7

In a general compression process, 2 kJ of mechanical work is supplied to 4 kg of fluid and 800 J of heat is rejected to the cooling jacket. The change in specific internal energy would be

Solution:

QUESTION: 8

Which among the following is not true?

Solution:

QUESTION: 9

The following data refer to a 6-cylinder, single- acting, two-stroke diesel engine:

Speed-250 rpm

Cylinder diameter - 0.7 m

Stroke of a piston - 1.2 m

Area of indicator diagram - 5.5 x 10^{-4} m^{2}

Length of diagram - 0.06 m

Spring value -144 MPa per m

What is the net rate of work transfer from the gas to the pistons in kW?

Solution:

Net work transfer,

QUESTION: 10

A piston-cylinder device with air at an initial temperature of 289C undergoes an expansion process for which pressure and volume are related as given below:

What is the work done by the system?

Solution:

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