1. Discharge of a centrifugal pump is ?

directly proportional to N

inversely proportional to N

directly proportional to N²

inversely proportional to N²

Answer: directly proportional to N

Explanation:


2. The speed ratio in case of Francis turbine varies from ?

0.15 to 0.3

0.4 to 0.5

0.6 to 0.9

1 to 1.5

Answer: 0.6 to 0.9

Explanation:


3. The cavitation in a hydraulic machine ?

causes noise and vibration of various parts

reduces the discharge of a turbine

causes sudden drop in power output and efficiency

all of the above

Answer: all of the above

Explanation:


4. A Pelton wheel is ?

tangential flow impulse turbine

inward flow impulse turbine

outward flow impulse turbine

inward flow reaction turbine

Answer: tangential flow impulse turbine

Explanation:


5. The overall efficiency for a Pelton wheel lies between ?

0.50 to 0.65

0.65 to 0.75

0.75 to 0.85

0.85 to 0.90

Answer: 0.85 to 0.90

Explanation:


6. In an inward flow reaction turbine ?

the water flows parallel to the axis of the wheel

the water enters at the centre of the wheel and then flows towards the outer periphery of the wheel

the water enters the wheel at the outer periphery and then flows towards the centre of the wheel

the flow of water is partly radial and partly axial

Answer: the water enters the wheel at the outer periphery and then flows towards the centre of the wheel

Explanation:


7. If the ratio of all the corresponding linear dimensions are equal, then the model and the prototype are said to have ?

geometric similarity

kinematic similarity

dynamic similarity

none of these

Answer: geometric similarity

Explanation:


8. A turbine develops 10 000 kW under a head of 25 metres at 135 r.p.m. Its specific speed is ?

175.41p.m

215.5 r.p.m

241.5 r.p.m

275.4 r.p.m

Answer: 241.5 r.p.m

Explanation:


9. For 450 m head of water.............. shall be used ?

Pelton wheel

Kaplan turbine

Francis turbine

none of these

Answer: Pelton wheel

Explanation:


10. The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is ?

slow speed with radial flow at outlet

medium speed with radial flow at outlet

high speed with radial flow at outlet

high speed with axial flow at outlet

Answer: high speed with axial flow at outlet

Explanation: