# Test: Thermodynamics- 1

## 25 Questions MCQ Test Mechanical Engineering SSC JE (Technical) | Test: Thermodynamics- 1

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Attempt Test: Thermodynamics- 1 | 25 questions in 50 minutes | Mock test for Mechanical Engineering preparation | Free important questions MCQ to study Mechanical Engineering SSC JE (Technical) for Mechanical Engineering Exam | Download free PDF with solutions
QUESTION: 1

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QUESTION: 2

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QUESTION: 3

### What is mean free path ?

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QUESTION: 4

Which of the following are pure substance.
i.O2 & N2 mixture
ii. Moist Air
iii. Dry Air.

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QUESTION: 5

When water is at saturated condition (i.e.Saturated liquid or saturated vapour) no. of independent intensive properties required to determine the state is

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QUESTION: 6

Degree of freedom at tripple point of water is

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QUESTION: 7

The thermometric property in a thermometer is

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QUESTION: 8

The steam point is 100º C or 212F. The Ice point is 0ºC or 32ºF.The relationship b/w  ºC and ºF is

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QUESTION: 9

It E = Energy Transfer M = Mass transfer In a isolated system which of the following is true,

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QUESTION: 10

An ideal gas at 127ºC is heated till its volume becomes two times at constant pressure. The new temperature is

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QUESTION: 11

Pressure of a system is said to be zero when

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QUESTION: 12

In a new temperature scale say of the boiling and freezing point of water at one atmosphere are  100º f and 300º f respectively, corelate this scale with centrigate scale. The reading of 0º f on the centrigate scale is

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QUESTION: 13

The pressure and temperature of tripple point of water is :

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QUESTION: 14 The process marked A is :

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QUESTION: 15

The diagram below shows a compression process in P-V diagram. Work required by a centrifugal compressor is equal to the area Solution:
QUESTION: 16

A container contains mixure of O2 gas and N2 gas. The number of independent intrinsic variables required to completely define The state of the system is

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QUESTION: 17

Change in internal energy in a reversible process occuring in a closed system is equal to the heat transfered in the process occurs at constant

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QUESTION: 18

A water heater of power 2kw is switched on for 10 minutes. The capacity of heater is 10 liter of water . If heat capacity of water is 4 KJ/KgK.The rise in temperature is :

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QUESTION: 19

In a isothermal process the fluid expands from 5 bar and 2m3 to 2.5 bar and 4m3. The heat added during the process is 50 kJ. The net work done during the process is.

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QUESTION: 20

In a thermal process, the pressure of a fixed mass of a gas is changed in such a manner that the gas molecules give out the heat of 30 J and work of 10 J is done on the gas. If the initial internal energy of the gas was 40 J, then the final internal energy will be?

Solution:

∆Q = (Uf - Ui) + ∆W
30 = Uf - 40 + 10
Uf = 60J.

QUESTION: 21

A real gas obeys perfect gas laws at very.
1. Low temperatures
2. high temperatures
3. Low pressures
4. High pressures

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QUESTION: 22

A heat engine works on carnot cycle work output is half of heat rejected to sink. The efficiency of the engine is

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QUESTION: 23

A Carnot cycle works between 27 ºC and 327 ºC. If engine produces 100 kJ of work  the entropy change during heat rejection is .

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QUESTION: 24

1. An adiabatic process is always a constant entropy process
2. In an adiabatic process heat transfer is equal to zero.

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QUESTION: 25

the dimentions of entropy is (q - Temperature)

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