A manufacturer claims to have a heat engine capable of developing 20 h.p. by receiving heat input of 400 kcal/mt and working between the temperature limits of 227° C and 27° C. His claim is__________________?
(A) justified
(B) not possible
(C) may be possible with lot of sophistications
(D) cost will be very high
(D) theroretically possible
A diathermic wall is one which____________________?
(A) prevents thermal interaction
(B) permits thermal interaction
(C) encourages thermal interaction
(D) discourages thermal interaction
(D) does not exist
Water contained in a beaker can be made to boil by passing steam through it__________________?
(A) at atmospheric pressure
(B) at a pressure below the firuosphejric pressure
(C) at a pressure greater than atmospheric pressure
(D) any pressure
(D) not possible
If a gas vapour is allowed to expand through a very minute aperture, then such a process is known as__________________?
(A) free expansion
(B) hyperbolic expansion
(C) adiabatic expansion
(D) parabolic expansion
(D) throttling
If a fluid expands suddenly into vacuum through an orifice of large dimension, then such a process is called___________________?
(A) free expansion
(B) hyperbolic expansion
(C) adiabatic expansion
(D) parabolic expansion
(D) throttling
Which of the following processes is irreversible process___________________?
(A) isothermal
(B) adiabatic
(C) throttling
(D) all of the above
(D) none of the above
Molecular volume of any perfect gas at 600 x 103 N/m2 and 27°C will be ____________________?
(A) 4.17m3/kgmol
(B) 400 m3/kg mol
(C) 0.15 m3/kg mol
(D) 41.7 m3/kg mol
(D) 417m3/kgmol
The more effective way of increasing efficiency of Carnot engine is to____________________?
(A) increase higher temperature
(B) decrease higher temperature
(C) increase lower temperature
(D) decrease lower temperature
(D) keep lower temperature constant
For reversible adiabatic process, change in entropy is_________________?
(A) maximum
(B) minimum
(C) zero
(D) unpredictable
(D) negative.
According to first law of thermodynamics__________________?
(A) work done by a system is equal to heat transferred by the system
(B) total internal energy of a system during a process remains constant
(C) internal energy, enthalpy and entropy during a process remain constant
(D) total energy of a system remains constant
(D) entropy of a system remains constant