Model Questions for SSC Junior Engineer EXAM - Mechanical Engg Set-7

1. The efficiency and work ratio of a simple gas turbine cycle are

A. low
B. very low
C. high
D. very high

2. The efficiency of Diesel cycle approaches to Otto cycle efficiency when

A. cut-off is increased
B. cut-off is decreased
C. cut-off is zero
D. cut-off is constant

3. The compression ratio for petrol engines is

A. 3 to 6
B. 5 to 8
C. 15 to 20
D. 20 to 30

4. Workdone in a free expansion process is

A. zero
B. minimum
C. maximum
D. positive

5. An adiabatic process is one in which

A. no heat enters or leaves the gas
B. the temperature of the gas changes
C. the change in internal energy is equal to the mechanical workdone
D. all of the above

Study Kit for SSC Junior Engineer EXAM (Paper-1) 2017-2018

6. The pressure exerted by an ideal gas is __________ of the kinetic energy of all the molecules contained in a unit volume of gas.

A. one-half
B. one-third
C. two-third
D. three-fourth

7. The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called

A. specific heat at constant volume
B. specific heat at constant pressure
C. kilo Joule
D. none of these

8. The processes occuring in open system which permit the transfer of mass to and from the system, are known as

A. flow processes
B. non-flow processes
C. adiabatic processes
D. none of these

9. A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as

A. Carnot cycle
B. Stirling cycle
C. Otto cycle
D. Diesel cycle

10. Which of the following has the minimum atomic mass?

A. Oxygen
B. Sulphur
C. Nitrogen
D. Carbon

Study Kit for SSC Junior Engineer EXAM (Paper-1) 2017-2018

Answer

1. (b) 2. (c) 3. (b) 4. (a) 5. (d) 6. (c) 7. (a) 8. (a) 9. (d) 10. (d)