Thermodynamics objective questions with answers part2

Q1. Gas turbine cycle
(A) consists of two isothermals and two isentropics
(B) consists of two isentropics and two constant volumes
(C) consists of one constant volume and one constant pressure
(D) consists of two isentropics and two constant pressures

Q2. The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will
(A) increase
(B) decrease
(C) same
(D) unpredictable. "

Q3. The cycle in which heat is supplied at constant volume and rejected at constant pressure is known as
(A) Dual combustion cycle
(B) Diesel cycle
(C) Atkinson cycle
(D) Stirling cycle.

Q4. Stirling and Ericsson cycles are
(A) reversible cycles
(B) irreversible cycles
(C) quasi-static cycles
(D) None of these

Q5. Otto cycle consists of
(A) two isothermals and two isentropics
(B) two isentropics and two constant volumes
(C) two isentropics, one constant volume and one constant pressure
(D) two isentropics and two constant pres-sures

Q6. Boyle’s law i.e. pV = constant is applicable to gases under
(A) all ranges of pressures
(B) small range of pressures
(C) high range of pressures
(D) atmospheric conditions

Q7. degree of subcooling is the difference between
(A) saturation temperature of liquid and actual temperature of liquid
(B) saturation temperature of vapour and actual temperature of liquid
(C) saturation temperature of liquid and actual temperature of vapour
(D) saturation temperature of vapour and actual temperature of vapour

Q8. No liquid can exist as liquid at
(A) Room temperature
(B) vacuum
(C) zero pressure
(D) center of earth

Q9. Absolute zero pressure will occur
(A) at sea level
(B) at the center of the earth
(C) when molecular momentum of the system becomes zero
(D) at room temperature

Q10. According to kinetic theory of gases, the absolute zero temperature is attained when
(A) volume of the gas is zero
(B) pressure of the gas is zero
(C) kinetic energy of the molecules is zero
(D) specific heat of gas is zero

Q11. Temperature of a gas is produced due to
(A) kinetic energy of molecules
(B) repulsion of molecules
(C) attraction of molecules
(D) surface tension of molecules.

Q12. The ratio of minimum energy which must be consumed to perform the task to the actual amount of energy consumed in performing the same task is called as
(A) first law efficiency
(B) second law efficiency
(C) energy efficiency
(D) none of the above

Q13. What is the equation for entropy of a system if two parts 1 and 2 having entropies S1 and S2 are considered in equilibrium?
(A) S = S1 – S2
(B) S = S1 + S2
(C) S = S1 * S2
(D) S = S1 / S2

Q14. General gas equation is
(A) PV=mRT
(B) PV = RT
(C) PV=KiRT
(D) Cp-Cv = 0

Q15. An ideal gas as compared to a real gas at very high pressure occupies
(A) more volume
(B) less volume
(C) same volume
(D) no such relation.

Q16. According to Gay-Lussac law for a perfect gas, the absolute pressure of given mass varies directly as
(A) temperature
(B) absolute
(C) absolute temperature, if volume kept constant
(D) None of these

Q17. Which of the following laws are applicable to perfect gas
(A) Boyle’s law
(B) Charles’law
(C) Gay-Lussac law
(D) all of these

Q18. Which among the following variables controls the physical properties of a perfect gas
(A) pressure
(B) temperature
(C) volume
(D) all of these

Q19. Kelvin Planck’s law deals with
(A) conservation of heat
(B) conservation of work
(C) conversion of heat into work
(D) conversion of work into heat

Q20. During throttling process
(A) heat exchange does not take place
(B) no work is done by expanding steam
(C) there is no change of internal energy of steam
(D) all of these