Thermodynamics Paper set for practice

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Thermodynamics Paper Set 1

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The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and recondensed, then the liquid with the next higher boiling point is then evaporated and recondensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called

1 cracking

2 carbonisation

3 fractional distillation

4 full distillation

Which of the following is correct?

1 Absolute pressure = Gauge pressure + Atmospheric pressure

2 Gauge pressure = Absolute pressure + Atmospheric pressure

3 Atmospheric pressure = Absolute pressure + Gauge pressure

4 Absolute pressure = Gauge pressure - Atmospheric pressure

If the value of n = 0 in the equation pvⁿ = C, then the process is called

1 constant volume process

2 adiabatic process

3 constant pressure process

4 isothermal process

The efficiency of Diesel cycle approaches to Otto cycle efficiency when

1 cut-off is increased

2 cut-off is decreased

3 cut-off is zero

4 cut-off is constant

The compression ratio for petrol engines is

1 3 to 6

2 5 to 8

3 15 to 20

4 20 to 30

The pressure exerted by an ideal gas is __________ of the kinetic energy of all the molecules contained in a unit volume of gas.

1 one-half

2 one-third

3 two-third

4 three-fourth

Workdone in a free expansion process is

1 zero

2 minimum

3 maximum

4 positive

The processes occuring in open system which permit the transfer of mass to and from the system, are known as

1 flow processes

2 non-flow processes

3 adiabatic processes

4 none of these

Which of the following represents Otto cycle on temperature - entropy (T - s) diagram?

An adiabatic process is one in which

1 no heat enters or leaves the gas

2 the temperature of the gas changes

3 he change in internal energy is equal to the mechanical workdone

4 all of the above

The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called

1 specific heat at constant volume

2 specific heat at constant pressure

3 kilo Joule

4 none of these

The efficiency and work ratio of a simple gas turbine cycle are

1 low

2 very low

3 high

4 very high

A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as

1 Carnot cycle

2 Stirling cycle

3 Otto cycle

4 Diesel cycle