Top 350+ Solved Thermodynamics MCQ Questions Answer
Q. In which case the work done per kg of air compressed from 1.05 ata, 15?C to 6.3 ata is minimum
a. Polytropic with index n = 1.35
b. Adiabatic
c. Polytropic with index n = 1.40
d. Isothermal
e. Polytropic with index n = 1.3
Q. Thermei is
a. A semi-conductor
b. An impurity added to a semi-conductor
c. A unit of temperature measurement
d. A unit of latent heat
e. Quantity of heat required to raise temperature of one tonne of water from 14.5?C to 15.5?C
Q. "Heat flows from hot substance to cold substance unaided". The name associated with the above statement is
a. Gay Lussac
b. Joule
c. Clausius
d. Planck
e. Kelvin
Q. The concept of black body in heat transfers applies to
a. microns
b. Objects which are black in colour
c. Objects well insulated from surroundings
d. Objects which are good conductors of heat
e. Objects that completely absorb impinging radiation
Q. A solar cell system is to suppmy 1050 kWh/month. The average output is 15 percent of the rated power. The rated power must be
a. 4.5 kW
b. Pulsejet
c. 9.7 kW
d. 3 kW
e. 14.4 kW
Q. Most of gases exhibit drop in temperature upon expansion. However, this may not be true in case of
a. Carbondioxide
b. Hydrogen
c. Helium
d. Oxygen
e. Pulsejet
Q. The extension and compression of a helical spring is an example of
a. Reversible process
b. Adiabatic process
c. Thermodynamic cycle
d. Irreversible process
e. Isothermal process
Q. In a Carnot cycle if isothermal compression process is continued bit longer than the normal, then the adiabatic compression will cause the steam to arrive at the inner dead center at a temperature
a. higher than the normal temperature
b. lower than the normal temperature
c. which is the normal temperature
d. Pulsejet
Q. Which of the following cycle consists of two constant pressure and two adiabatic processes?
a. Carnot cycle
b. Joule cycle
c. Diesel cycle
d. Dual cycle
e. Otto cycle
Q. One litre of gas A and two litres of gas B. both having same temperature 100?C and same pressure 2.5 bar will have the ratio of kinetic energies of their molecules as
a. 1 ; 2
b. 4 ; 1
c. 1 ; 1
d. 1 ; 4
e. Pulsejet
Q. Diesel cycle processes are
a. Two isentropic, one constant volume one constant pressure
b. Isentropic, isothermal, constant volume, constant pressure
c. Two constant volume, one constant pressure, one isothermal
d. Two isentropic and two isothermal
e. Two constant pressure, one constant volume, one isentropic
Q. Which of the following cycle is less efficient than the remaining?
a. Ericsson cycle
b. Stirling cycle
c. Otto cycle
d. Pulsejet
e. Carnot cycle
Q. The function of a clutch in automobiles
a. To disengage power from engine to flywheel
b. To disengage power from engine to gear box
c. To disengage power from engine to wheels
d. To absorb power
e. To disengage power from wheels to engine
Q. The rate of heat flow from a 50 mm thick wall of material having thermal conductivity of 40 W/m?C for a temperature difference of 10?C will be
a. 80000 kcal/m2 hr
b. 800 kcal/m2 hr
c. 2000 kcal/m2 hr
d. 8000 kcal/m2 hr
e. 80 kcal/m2 hr
Q. According to the Kinetic theory of gases the collision between the molecules are assumed to be
a. Perfectly elastic
b. Partly elastic
c. Partly inelastic
d. 50% elastic
e. Perfectly inelastic