# Engineering Thermodynamics MCQ Practice Tests Set – 30

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## Q1. Otto cycle consists of

(A) Two constant volume and two isentropic processes
(B) Two constant pressure and two isentropic processes
(C) Two constant volume and two isothermal processes
(D) One constant pressure, one constant volume and two isentropic processes

## Q2. In a steady flow process, the ratio of

(A) Heat transfer is constant
(B) Work transfer is constant
(C) Mass flow at inlet and outlet is same
(D) All of these

## Q3. Diesel cycle consists of __ processes.

(A) Two constant volume and two isentropic
(B) Two constant pressure and two isentropic
(C) Two constant volume and two isothermal
(D) One constant pressure, one constant volume and two isentropic

## Q4. When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel, the process is known as __ of fuel.

(A) Atomization
(B) Carbonization
(C) Combustion
(D) None of these

(A) 8
(B) 18
(C) 16
(D) 32

## Q6. When the gas is cooled at constant pressure,

(A) Its temperature increases but volume decreases
(B) Its volume increases but temperature decreases
(C) Both temperature and volume increases
(D) Both temperature and volume decreases

## Q7. The entropy may be expressed as a function of

(A) Pressure and temperature
(B) Temperature and volume
(C) Heat and work
(D) All of these

## Q8. Select the wrong statement

(A) A Joule cycle consists of two constant volume and two isentropic processes.
(B) An Otto cycle consists of two constant volume and two isentropic processes.
(C) An Ericsson cycle consists of two constant pressure and two isothermal processes.
(D) All of the above

(A) Volume
(B) Temperature
(C) Mass
(D) Energy

(A) Zero
(B) 1/5
(C) 4/5
(D) 1

## Q11. When a system changes its state from one equilibrium state to another equilibrium state, then the path of successive states through which the system has passed, is known as

(A) Thermodynamic law
(B) Thermodynamic process
(C) Thermodynamic cycle
(D) None of these

(A) Sum
(B) Difference
(C) Product
(D) Ratio

## Q13. The compression ratio is the ratio of

(A) Swept volume to total volume
(B) Total volume to swept volume
(C) Swept volume to clearance volume
(D) Total volume to clearance volume

## Q14. In an extensive property of a thermodynamic system

(A) Extensive heat is transferred
(B) Extensive work is done
(C) Extensive energy is utilized
(D) None of these

## Q15. All perfect gases change in volume by 1/273th of its original volume at 0°C for every 1°C change in temperature, when the pressure remains constant. This statement is called

(A) Boyle’s law
(B) Charles’ law
(C) Gay-Lussac law
(D) Joule’s law

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