For a thermodynamic process to be reversible, the temperature difference between hot body and working substance should be___________________?

Related Mcqs:

1. The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that___________________?

   A. carnot cycle can’t work with saturated steam
   B. heat is supplied to water at temperature below the maximum temperature of the cycle
   C. a rankine cycle receives heat at two places
   D. rankine cycle is hypothetical
   E. none of the above

2. If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly_________________?

   A. temperature
   B. enthalpy
   C. internal energy
   D. entropy
   E. all of the above

3. The basis for measuring thermodynamic property of temperature is given by___________________?

   A. zeroth law of thermodynamics
   B. first law of thermodynamics
   C. second law of thermodynamics
   D. third law of thermodynamics
   E. Avogadro’s hypothesis

4. Properties of substances like pressure, temperature and density, in thermodynamic coordinates are__________________?

   A. path functions
   B. point functions
   C. cyclic functions
   D. real functions
   E. thermodynamic functions

5. A gas is compressed in a cylinder by a movable piston to a volume one-half its original volume. During the process 300 kJ heat left the gas and internal energy remained same. The work done on gas in Nm will be___________________?

   A. 300 Nm
   B. 300,000 Nm
   C. 30 Nm
   D. 3000 Nm
   E. 30,000 Nm

6. 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

7. In a non-flow reversible process for which p = (- 3V+ 15) x 105N/m2,V changes from 1 m to 2 m3. The work done will be about_______________?

   A. 100 xlOO5 joules
   B. lxlO5 joules
   C. 10 xlO5 joules
   D. 10 xlO5 kilo joules
   E. 10xl04kiojoules

8. Change in enthalpy 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

9. 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

10. For reversible adiabatic process, change in entropy is_________________?

    A. maximum
    B. minimum
    C. zero
    D. unpredictable
    E. negative.