Turbo Machines Test Questions - Set 2

1)   The water from runner in reaction turbine is discharged into tail race through a draft tube which has ____________ cross sectional area.

a. constant
b. gradually decreasing
c. gradually increasing
d. uneven
Answer  Explanation 

ANSWER: gradually increasing

Explanation:
No explanation is available for this question!


2)   __________ turbines are also called as parallel flow turbine.

a. Radial flow
b. Axial flow
c. Both radial flow and axial flow
d. None of the above
Answer  Explanation 

ANSWER: Axial flow

Explanation:
No explanation is available for this question!


3)   In which type of reaction turbine does the water flow in radial direction at the outer periphery of runner and leave at the centre in the direction parallel to the axis of rotation of runner?

a. Radial flow turbine
b. Axial flow turbine
c. Mixed flow turbine
d. All of the above
Answer  Explanation 

ANSWER: Mixed flow turbine

Explanation:
No explanation is available for this question!


4)   Generally, the value of specific speed of Kaplan turbine is _____________ that of the Pelton turbine.

a. lower than
b. higher than
c. same as
d. unpredictable
Answer  Explanation 

ANSWER: higher than

Explanation:
No explanation is available for this question!


5)   The passage of uniformly varying cross-section in which the kinetic energy of steam increases at the expense of its pressure is called as__________

a. steam turbine
b. steam nozzle
c. steam area
d. all of the above
Answer  Explanation 

ANSWER: steam nozzle

Explanation:
No explanation is available for this question!


6)   The nozzle efficiency can be defined as the ratio of

a. isentropic enthalpy drop to actual enthalpy drop
b. actual enthalpy drop to isentropic enthalpy drop
c. isothermal enthalpy drop to isentropic enthalpy drop
d. isentropic enthalpy drop to isothermal enthalpy drop
Answer  Explanation 

ANSWER: actual enthalpy drop to isentropic enthalpy drop

Explanation:
No explanation is available for this question!


7)   Which of the following are effects of nozzle friction? 1. Enthalpy drop decreases 2. Exit velocity reduces 3. Decrease in specific volume 4. Decrease in mass flow rate

a. (1), (2) and (3)
b. (2), (3) and (4)
c. (1), (3) and (4)
d. (1), (2) and (4)
Answer  Explanation 

ANSWER: (1), (2) and (4)

Explanation:
No explanation is available for this question!


8)   The quality of vapour at the exit of nozzle ___________ due to nozzle friction.

a. increases
b. decreases
c. does not change
d. unpredictable
Answer  Explanation 

ANSWER: increases

Explanation:
No explanation is available for this question!


9)   Pump transfers the mechanical energy of a motor or of an engine into _________ of a fluid.

a. pressure energy
b. kinetic energy
c. either pressure energy or kinetic energy
d. pressure energy, kinetic energy or both
Answer  Explanation 

ANSWER: pressure energy, kinetic energy or both

Explanation:
No explanation is available for this question!


10)   Which of the following is NOT a type of positive displacement pumps?

a. Reciprocating pump
b. Rotary displacement pump
c. Centrifugal pump
d. None of the above
Answer  Explanation 

ANSWER: Centrifugal pump

Explanation:
No explanation is available for this question!