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.Management Sciences
Category: Thermodynamics
Kinetic energy of the molecules in terms of absolute temperature (T) is proportional to________________?
A. T
B. j
C. J2
D. Vr
E. 1/Vr
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
E. theroretically possible
The index of compression n tends to reach ratio of specific heats y when____________________?
A. flow is uniform and steady
B. process is isentropic
C. process is isothermal
D. process is isentropic and specific heat does not change with temperature
E. process is isentropic and specific heat changes with temperature
The door of a running refrigerator inside a room was left open____________________?
Which of the following statements is correct ?
A. The room will be cooled to the temperature inside the refrigerator.
B. The room will be cooled very slightly.
C. The room will be gradually warmed up.
D. The temperature of the air in room will remain unaffected.
E. any one of above is possible depending on the capacity
Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant_______________?
A. pressure
B. temperature
C. volume
D. internal energy
E. entropy
The condition of perfect vacuum, i.e., absolute zero pressure can be attained at ____________________?
A. a temperature of – 273.16°C
B. a temperature of 0°C
C. a temperature of 273 °K
D. a negative pressure and 0°C temperature
E. can’t be attained
Which of the following is an irreversible cycle_____________________?
A. carnot
B. Stirling
C. ericsson
D. all of the above
E. none of the above
Minimum work in compressor is possible when the value of adiabatic index n is equal to_________________?
A. 0.75
B. 1
C. 1.27
D. 1.35
E. 2
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
E. entropy of a system remains constant
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