Top 350+ Solved Thermodynamics MCQ Questions Answer
Q. The ratio of enthalpy rise in rotor of a centrifugal compressor to the enthalpy rise in stage is called
a. Adiabatic efficiency
b. Degree of reaction
c. Volumetric efficiency
d. Dynamic pressure ratio
e. Static pressure ratio
Q. During isothermal process
a. Pulsejet
b. supply of heat is accompanied by rise in temperature
c. rise in entropy is accompanied by rise in temperature
d. drop in pressure is accompanied by drop in volume
e. rejection of heat is accompanied by decrease in volume
Q. Which of the following relations is not applicable to free expansion process?
a. Heat supplied = Zero
b. Change in internal energy = Zero
c. Change in temperature = Zero
d. Heat rejected = Zero
e. Work done = Zero
Q. Maxwell's thermodynamic relations are valid for
a. Transient conditions only
b. Closed system only
c. Only reversible processes
d. All processes
e. A thermodynamic system in equilibrium
Q. If during a process, the entropy of the isolated system increases, the process is
a. Adiabatic
b. Ideal
c. Isothermal
d. Reversible
e. Irreversible
Q. Kelvin's law deals with
a. conservation of work
b. conservation of heat
c. conversion of work into heat
d. conversion of heat into work
e. Pulsejet
Q. The processes of a Carnot cycle are
a. Two adiabatic and two constant volume
b. Two constant volume and two isothermals
c. Two isothermals and two isentropics
d. Two adiabatics and two isothermals
e. One constant volume one constant pressure and two isentropics
Q. Theoretically in a petrol engine during which stroke both suction as well as exhaust valves will remain closed?
a. Suction stroke
b. Exhaust stroke
c. Both suction and exhaust strokes
d. None of the above
e. Pulsejet
Q. The unit of Universal Gas constant is
a. Dynes/?K
b. erg/?K
c. kcal/?K
d. It is dimensionless
e. W/m?K
Q. Pipes are insulated so that
a. They may not break under pressure
b. There is minimum corrosion
c. Capacity to withstand pressure is increased
d. Heat loss from the surface is minimized
e. None of the above
Q. The process that follows the equation pvn = constant, is called
a. Adiabatic process
b. Constant pressure process
c. Constant volume process
d. Constant temperature process
e. Polytropic process
Q. The total radiant energy emitted by a plane surface per unit area and unit time is called
a. Radiant flux density
b. Total absorptivity
c. Radiant energy
d. Radiant intensity
e. None of the above
Q. Maxwells relations are valid for
a. compressible substances
b. all substances solid, liquid or gas
c. systems of fixed chemical compositions
d. Pulsejet
e. homogeneous as well as heterogeneous systems
Q. Clog point of an oil is
a. The point of maximum contamination of oil
b. The level of impurities beyond which oil ceases to flow
c. The temperature at which oil solidifies
d. The temperature at which paraffin and waxes in oil start precipitating
e. None of the above