Test: Thermodynamics- 1 - Mechanical Engineering MCQ

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

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

Degree of freedom at tripple point of water is

The thermometric property in a thermometer is

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

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

An ideal gas at 27°C is heated at constant pressure till the volume becomes three times. The final temperature of the gas will be:

Pressure of a system is said to be zero when

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

The pressure and temperature of tripple point of water is :

The process marked A is :

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

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

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

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 :

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.

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? 

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

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

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

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

the dimentions of entropy is (q - Temperature)