Hydraulics & Pneumatics Test Questions - Set 14

1)   Specific speed for reaction turbines ranges from___________________?

a. 0 to 4.5
b. 10 to 100
c. 80 to 200
d. 250 to 300
e. none of the above
Answer  Explanation 

ANSWER: 10 to 100

Explanation:
No explanation is available for this question!


2)   The discharge through a reaction turbine with increase in unit speed____________________?

a. increases
b. decreases
c. remains unaffected
d. first increases and then decreases
e. first decreases and then increases
Answer  Explanation 

ANSWER: decreases

Explanation:
No explanation is available for this question!


3)   Francis, Kaplan and propeller turbines fall under the category of___________________?

a. Impulse turbines
b. Reaction turbines
c. Axial flow turbines
d. Mixed flow turbines
e. Reaction-cum-impulse turbines
Answer  Explanation 

ANSWER: Reaction turbines

Explanation:
No explanation is available for this question!


4)   Francis turbine is best suited for_____________________?

a. medium head application from 24 to 180 m
b. low head installation up to 30 m
c. high head installation above 180 m
d. all types of heads
e. none of the above
Answer  Explanation 

ANSWER: medium head application from 24 to 180 m

Explanation:
No explanation is available for this question!


5)   Impulse turbine is generally fitted______________________?

a. at the level of tail race
b. little above the tail race
c. slightly below the tail race
d. about 2.5 m above the tail race to avoid cavitation
e. about 2.5 m below the tail race to avoid cavitation
Answer  Explanation 

ANSWER: little above the tail race

Explanation:
No explanation is available for this question!


6)   In reaction turbine, draft tube is used_____________________?

a. to transport water downstream without eddies
b. to convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section
c. for safety of turbine
d. to increase flow rate
e. none of the above
Answer  Explanation 

ANSWER: to convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section

Explanation:
No explanation is available for this question!


7)   A turbine pump is basically a centrifugal pump equipped additionally with_________________?

a. adjustable blades
b. backward curved blades
c. vaned diffusion casing
d. inlet guide blades
e. totally submerged operation facility
Answer  Explanation 

ANSWER: vaned diffusion casing

Explanation:
No explanation is available for this question!


8)   The specific speed of turbine is defined as the speed of a unit___________________?

a. of such a size that it delivers unit dis-charge at unit head
b. of such a size that it delivers unit dis-charge at unit power
c. of such a size that it requires unit power per unit head
d. of such a size that it produces unit horse power with unit head
e. none of the above
Answer  Explanation 

ANSWER: of such a size that it produces unit horse power with unit head

Explanation:
No explanation is available for this question!


9)   Medium specific speea of turbine implies it is___________________?

a. propeller turbine
b. Francis turbine
c. impulse turbine
d. any one of the above
e. none of the above
Answer  Explanation 

ANSWER: Francis turbine

Explanation:
No explanation is available for this question!


10)   Runaway speed of a hydraulic turbine is_________________?

a. full load speed
b. the speed at which turbine runner will be damaged
c. the speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open
d. the speed corresponding to maximum overload permissible
e. none of the above
Answer  Explanation 

ANSWER: the speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open

Explanation:
No explanation is available for this question!


11)   Low specific speed of turbine implies it is__________________?

a. propeller turbine
b. Francis turbine
c. impulse turbine
d. any one of the above
e. none of the above
Answer  Explanation 

ANSWER: impulse turbine

Explanation:
No explanation is available for this question!


12)   High specific speed of a pump implies it is_____________________?

a. centrifugal pump
b. mixed flow pump
c. axial flow pump
d. any one of the above
e. none of the above
Answer  Explanation 

ANSWER: axial flow pump

Explanation:
No explanation is available for this question!


13)   For very high discharge at low pressure such as for flood control and irrigation applications, following type of pump is preferred_________________?

a. centrifugal
b. axial flow
c. reciprocating
d. mixed flow
e. none of the above
Answer  Explanation 

ANSWER: axial flow

Explanation:
No explanation is available for this question!


14)   In a centrifugal pump casing, the flow of water leaving the impeller, is___________________?

a. rectilinear flow
b. radial flow
c. free vortex motion
d. forced vortex
e. none of the above
Answer  Explanation 

ANSWER: free vortex motion

Explanation:
No explanation is available for this question!