MCQ
2201.
Which of the following cycles uses air as the refrigerant?
Ericsson
Carmot
Stirling
Bell-coleman
2202.
In an isothermal process-
There is no change in enthalpy
There is no change in internal energy
There is no change in temperature
All of these
2203.
Ammonia-absorption refrigeration cycle requires--
very litle work input
maximum work, input
nearly same work input as for vapour
compression cycle zero work input
2204.
Temperature of a gas is produced due to-
Its heating value
Kinetic energy of molecules
Repulsion of molecules
Attraction of molecules
2205.
The ratio of two specific heats of air is equal to-
0.17
0.24
0.1
1.41
2206.
Measurement of temperaturę is based on-
Thermodynamic properties
Zeroth law of thermodynamics
First law of thermodynamics
Second law of thermodynamics
2207.
Specific heat of air at constant pressure is equal to-
0.17
0.21
0.24
1.0
2208.
Presence of moisture in a refrigerant affects the working of--
compressor
condemer
evaporator
expansion valve
2209.
The relative coefficient of performance is-
actual COP/theoretical COP
theoretical COP/actual COP
actual COP x theoretical COP
1-actual COP x theoretical COP
2210.
Superheated vapour behaves—
Exactly as gas
As steam
As ordinary vapour
Approximately as a gas
2211.
For better COP of refrigerator, the pressure range corresponding to temperature in evaporator and condemer must be-
small
equal
high
anything
2212.
Intensive property of a system is one whose value-
Depends on the mass of the system, like volume
Does not depend on the mass of the system, like temperature, pressure etc.
Is not dependent on the path followed but on the state
Is dependent on the path followed and not on the state
2213.
Which of the following variables controls the physical properties of a perfect gas?
Pressure
Temperature
Volume
All of the above
2214.
According to Kelvin-Planck statement, it is impossible to construct a device operating on a cycle which transfers heat from-
Low pressure heat reservoir to high pressure reservoir
Low temperature heat reservoir to high temperature reservoir
High pressure heat reservoir to low pressure reservoir
High temperature heat reservoir to low temperature reservoir
2215.
According to kinetic theory of gases, the absolute zero temperature is attained when-
Volume of the gas is zero
Pressure of the gas is zero
Kinetic energy of the molecules is zero
Specific heat of gas is zero
2216.
Kelvin-Planck's law deals with-
Conservation of heat
Conservation of work
Conversion of heat into work
Conversion fo work into heat
2217.
Which of the following quantities is not the property of the system?
Pressure
Temperature
Specific volume
Heat
2218.
Which of the following is not the intensive property?
Pressure
Temperature
Density
Heat
2219.
Extensive property of a system is one whose value-
Depends on the mass of the system like volume
Does not depend on the mass of the system, like temperature, pressure etc.
Is not dependent on the path followed but on the state
Is dependent on the path followed and not on the state
2220.
Vapour compression refrigeration is some what like-.
Camot cycle
Rankine cycle
reversed Canet cycle
none of the above