Online Mechanical Engineering Test - Thermodynamics Test

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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An adiabatic process is one in which

no heat enters or leaves the gas

the temperature of the gas changes

the change in internal energy is equal to the mechanical workdone

all of the above

[#]

When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.

zero

1/5

4/5

[#]

Which of the following is the correct statement of the second law of thermodynamics?

It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work.

It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source.

There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy.

all of the above

[#]

The absolute pressure of a given mass of a perfect gas varies inversely as its volume, when the temperature remains constant. This statement is known as Charles' law.

Yes

[#]

In an isothermal process,

there is no change in temperature

there is no change in enthalpy

there is no change in internal energy

all of these

[#]

The heat absorbed during a polytropic process is

x Workdone

all of these

[#]

Liquid fuels have higher calorific value than solid fuels.

Yes

[#]

The amount of heat required to raise the temperature of unit mass of a gas through one degree at constant pressure is called specific heat at constant pressure.

True

False

[#]

When a gas is heated at constant volume

its temperature will increase

its pressure will increase

both temperature and pressure will increase

neither temperature nor pressure will increase

[#]

10.

When a fluid is allowed to expand suddenly into a vaccum chamber through an orifice of large dimensions, the process is known as free expansion process.

True

False

[#]

11.

One molecule of oxygen consists of __________ atoms of oxygen.

[#]

12.

One kg of carbon monoxide requires 4/7 kg of oxygen and produces

11/3 kg of carbon dioxide gas

7/3 kg of carbon monoxide gas

11/7 kg of carbon dioxide gas

8/3 kg of carbon monoxide gas

[#]

13.

The polytropic index (n) is given by

[#]

14.

The entropy may be expressed as a function of

pressure and temperature

temperature and volume

heat and work

all of these

[#]

15.

The bomb calorimeter is used for finding the __________ calorific value of solid and liquid fuels.

higher

lower

[#]

16.

When the gas is heated at constant pressure, the heat supplied

increases the internal energy of the gas

increases the temperature of the gas

does some external work during expansion

Both (B) and (C)

[#]

17.

The mass of carbon per kg of flue gas is given by

[#]

18.

The mass of excess air supplied is equal to

x Mass of excess carbon

x Mass of excess oxygen

x Mass of excess carbon

x Mass of excess oxygen

[#]

19.

A cycle consisting of two constant pressure and two isothermal processes is known as Ericsson cycle.

True

False

[#]

20.

A molecule consisting of one atom is known as

monoatomic

diatomic

triatomic

polyatomic

[#]

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