Mechanical Engineering Thermodynamics - Set 08 - ObjectiveBooks

# Practice Test: Question Set - 08

1. Isochoric process is one in which
(A) Free expansion takes place
(B) Very little mechanical work is done by the system
(C) No mechanical work is done by the system
(D) All parameters remain constant

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

3. For the same compression ratio, the efficiency of dual combustion cycle is
(A) Greater than Diesel cycle and less than Otto cycle
(B) Greater than Diesel cycle
(C) Less than Diesel cycle
(D) Less than Diesel cycle and greater than Otto cycle

4. When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called
(A) Zeroth law of thermodynamics
(B) First law of thermodynamics
(C) Second law of thermodynamics
(D) Kelvin Planck's law

5. Energy can neither be created nor destroyed but can be converted from one form to other is inferred from
(A) Zeroth low of thermodynamic
(B) First law of thermodynamics
(C) Second law to thermodynamics
(D) Basic law of thermodynamics

6. First law of thermodynamics furnishes the relationship between
(A) Heat and work
(B) Heat, work and properties of the system
(C) Various properties of the system
(D) Various thermodynamic processes

7. 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

8. The specific heat at constant volume is
(A) The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume
(B) The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant pressure
(C) The amount of heat required to raise the temperature of 1 kg of water through one degree
(D) Any one of the above

9. In an irreversible process, there is a
(A) No loss of heat
(B) Loss of heat
(C) Gain of heat
(D) No gain of heat

10. In an isothermal process, the internal energy
(A) Increases
(B) Decreases
(C) Remain constant
(D) First increases and then decreases

11. 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

12. According to first law of thermodynamics
(A) Mass and energy are mutually convertible
(B) Carnot engine is most efficient
(C) Heat and work are mutually convertible
(D) Mass and light are mutually convertible

13. Total heat of a substance is also known as
(A) Internal energy
(B) Entropy
(C) Thermal capacity
(D) Enthalpy

14. First law of thermodynamics
(A) Enables to determine change in internal energy of the system
(B) Does not enable to determine change in entropy
(C) Provides relationship between heat, work and internal energy
(D) All of the above

15. Addition of heat at constant pressure to a gas results in
(A) Raising its temperature
(B) Raising its pressure
(C) Raising its volume
(D) Raising its temperature and doing external work

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