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Which turbine has highest speed?
d Explanation: Francis turbine has a specific speed of 60 to 300 rpm. Specific speed of Pelton turbine is lowest. Speed of Kaplan turbine is 2 to 3 times more than that of Francis turbine
d
See lessExplanation: Francis turbine has a specific speed of 60 to 300 rpm. Specific speed of
Pelton turbine is lowest. Speed of Kaplan turbine is 2 to 3 times more than that of
Francis turbine
Inside pressure of which of the following turbine is equal to atmospheric pressure?
d Explanation: Francis and propeller turbines are totally submerged in water, the turbine casing is full of water. As the water flows through the turbine blades, its pressure changes. Also the discharging water creates negative pressure below the turbine blades. Pelton turbines are fitted in open aiRead more
d
See lessExplanation: Francis and propeller turbines are totally submerged in water, the turbine
casing is full of water. As the water flows through the turbine blades, its pressure
changes. Also the discharging water creates negative pressure below the turbine
blades. Pelton turbines are fitted in open air and water Jet is forced into its blades by
nozzel so it’s inside pressure is equal to atmospheric pressure
Operating head of Francis turbine is __________
c Explanation: Francis turbines are medium head(30 to 200 m) and medium flow turbines. Using it for low or high head will cause inefficient operation. Their life is about decades so maintenance cost is low.
c
See lessExplanation: Francis turbines are medium head(30 to 200 m) and medium flow turbines.
Using it for low or high head will cause inefficient operation. Their life is about decades
so maintenance cost is low.
Operating head of Francis turbine is ________
c Explanation: Francis turbines are medium head(30 to 200 m) and medium flow turbines. Using it for low or high head will cause inefficient operation. Their life is about decades so maintenance cost is low.
c
See lessExplanation: Francis turbines are medium head(30 to 200 m) and medium flow turbines.
Using it for low or high head will cause inefficient operation. Their life is about decades
so maintenance cost is low.
7.Pelton turbines are used for __________________
d Explanation: Pelton turbines are impulse turbines and are suitable for high head low flow plants. Pelton turbines consist of elliptical shaped buckets along its Periphery. Water is released from nozzle to the buckets of turbine.
d
See lessExplanation: Pelton turbines are impulse turbines and are suitable for high head low flow
plants. Pelton turbines consist of elliptical shaped buckets along its Periphery. Water is
released from nozzle to the buckets of turbine.
.Trash racks are located _____________
: d Explanation: Intake includes headworks at the entrance of conduit. Those headworks include different structures, trash racks are one of them. Trash racks are fitted directly at the intake to prevent the floating and other materials from going into the conduit.
: d
See lessExplanation: Intake includes headworks at the entrance of conduit. Those headworks
include different structures, trash racks are one of them. Trash racks are fitted directly at
the intake to prevent the floating and other materials from going into the conduit.
The pressure at the inlet or exit of the draft tube should not be _________
a Explanation: Decrease in pressure in any portion of turbine below one third of atmospheric pressure may cause vapour bubbles or cavities to form. This phenomenon is called cavitation. Also to maintain continuity of flow without vaporisation the pressure should not fall below vapour pressure of watRead more
a
See lessExplanation: Decrease in pressure in any portion of turbine below one third of
atmospheric pressure may cause vapour bubbles or cavities to form. This phenomenon
is called cavitation. Also to maintain continuity of flow without vaporisation the pressure
should not fall below vapour pressure of water.
Trash racks are built for ___________
b Explanation: Heavy solid materials flowing with water can damage the turbine blades if not stopped. Trash racks are closely spaced flat bars which provides narrow path from which such unwanted materials cannot pass.
b
See lessExplanation: Heavy solid materials flowing with water can damage the turbine blades if
not stopped. Trash racks are closely spaced flat bars which provides narrow path from
which such unwanted materials cannot pass.
.Dam having very wide base as compared to its height is called _________
c Explanation: Buttress dams are the concrete dams supported on downstream side by buttresses. Arc dams are concrete dams curved from upstream side. Earth dam is a type of embankment dam and have rock filled inside the structure
c
See lessExplanation: Buttress dams are the concrete dams supported on downstream side by
buttresses. Arc dams are concrete dams curved from upstream side. Earth dam is a type
of embankment dam and have rock filled inside the structure
Which of the following statement is true about hydroelectric power plant?
a Explanation: It is because in addition to generation of electricity they are also used for irrigation, flood control etc. Frequency control in such plants is done easily just by controlling flow of water to the turbine through valves and gates. Due to low maintenance cost and no fuel requirement rRead more
a
See lessExplanation: It is because in addition to generation of electricity they are also used for
irrigation, flood control etc. Frequency control in such plants is done easily just by
controlling flow of water to the turbine through valves and gates. Due to low
maintenance cost and no fuel requirement running cost of a plant is very low. Water is
not fuel