Thermal Engineering 2 solved MCQs

1 of 21

1. Nozzle is used to control direction or characteristics of flow.

a. true

B. false

2.  In fountains the type of nozzle used is

a. none of the mentioned

B. turbulent jet

c. high speed nozzle

d. laminar jet

3. If mach number is less than one then its flow is                              

a. subsonic flow

B. turbulent flow

c. laminar flow

d. none of the mentioned

4. The steam leaves the nozzle at a

a. low pressure and a high velocity

B. high pressure and a high velocity

c. high pressure and a low velocity

d. low pressure and a low velocity

5. When mach number is greater than one the flow is                  

a. subsonic

B. supersonic

c. laminar

d. none of the mentioned

6. In rocket engines the amount of expansion in Nozzle determines the                      

a. exit temperature

B. exit pressure

c. exit temperature & pressure

d. none of the mentioned

7. De-Laval turbine is a                          

a. multi rotor impulse turbine

B. impulse reaction turbine

c. single rotor impulse turbine

d. none of the mentioned

8. The supersaturated flow of steam through a nozzle as compared to a stable flow, the available heat drop                          

a. increases

B. decreases

c. is unpredictable

d. remains same

9. The Parsons’ reaction turbine has

a. only moving blades

B. only fixed blades

c. fixed and moving blades of different shape

d. identical fixed and moving blades

10. What is the critical pressure ratio for initially wet steam?

a. 0.582

B. 0.546

c. 0.577

d. 0.601

11. The ratio of the useful heat drop to the isentropic heat drop is called                          

a. condenser efficiency

B. nozzle efficiency

c. vacuum efficiency

d. boiler efficiency

12. Rateau turbine is                          

a. pressure-velocity compounded turbine

B. simple reaction turbine

c. velocity compounded turbine

d. pressure compounded turbine

13. When the cross-section of a nozzle increases continuously from entrance to exit, it is called a                          

a. convergent-divergent nozzle

B. divergent nozzle

c. convergent nozzle

d. none of the mentioned

14. Aeroderivative engines have pressure ratios

a. greater than 30

B. lesser than 30 and greater than 20

c. greater than 50

d. none of the mentioned

15. Aeroderivative engines are larger.

a. true

B. false

16. Aeroderivative engines release higher emissions.

a. true

B. false

17. Critical pressure ratio is ratios of pressures at discharge.

a. minimum

B. none of the mentioned

c. optimum

d. maximum

18. Ratio of critical pressure to inlet pressure in known as                        

a. none of the mentioned

B. pressure ratio

c. critical pressure ratio

d. isoentropic pressure ratio

19. In De Laval Nozzle critical pressure ratio is given by (2/y+1)^(y/y-1).

a. true

B. false

20. With the increase in pressure, the exit velocity                    

a. decreases

B. increases

c. same

d. independent

21. The Prandtl Number approximates

a. momentum diffusivity to thermal diffusivity

B. thermal diffusivity to momentum diffusivity

c. shear stress to thermal diffusivity

d. thermal diffusivity to kinematic viscosity

22. Pumps increase                      

a. pressure

B. velocity

c. momentum

d. heat

23. Which among the following is the formula for volumetric flow rate?

a. q = v/a

B. q = av

c. q = a+v

d. q = a-v

24. Which among the following is the formula for mass flow rate?

a. q = m/p

B. q = mp

c. q = m + p

d. q = m – p

25. Compressible flow mainly deals with

a. solid dynamics

B. liquid dynamics

c. gas dynamics

d. solid and liquid dynamics

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