Related Questions
What is the correct answer?
4
The cavitation in reaction turbines is avoided, to a great extent by
A. Installing the turbine below the tail race level
B. Using stainless steel runner of the turbine
C. Providing highly polished blades to the runner
What is the correct answer?
4
In impulse Turbine, energy available at the inlet is in the form of
What is the correct answer?
4
A centrifugal pump will start delivering liquid only when the pressure rise in the impeller is equal to the
What is the correct answer?
4
A turbine is required to develop 1500 kW at 300 r.p.m. under a head of 150 m. Which of the following turbine should be used?
A. Pelton wheel with one nozzle
B. Pelton wheel with two or more nozzles
What is the correct answer?
4
By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. This saving in case of a single acting reciprocating pump is
What is the correct answer?
4
In a centrifugal pump casing, the flow of water leaving the impeller, is
What is the correct answer?
4
Which of the following is not a reaction turbine?
What is the correct answer?
4
Saving of work done and power by fitting an air vessel to double acting reciprocating pump is of the order of
What is the correct answer?
4
The power developed by a turbine is (where H = Head of water under which the turbine is working)
A. Directly proportional to H1/2
B. Inversely proportional to H1/2
C. Directly proportional to H3/2
D. Inversely proportional to H3/2
What is the correct answer?
4
The specific speed (Ns) of a centrifugal pump is given by
What is the correct answer?
4
Geometric similarity is said to exist between the model and the prototype, if both of them
A. Have identical velocities
B. Are equal in size and shape
C. Are identical in shape, but differ only in size
What is the correct answer?
4
Which of the following statement is correct?
A. The centrifugal pump is suitable for large discharge and smaller heads.
B. The centrifugal pump requires less floor area and simple foundation as compared to reciprocating pump.
C. The efficiency of centrifugal pump is less as compared to reciprocating pump.
What is the correct answer?
4
The ratio of actual work available at the turbine to the energy imparted to the wheel is known as ________ efficiency.
What is the correct answer?
4
A turbine develops 10000 kW under a head of 25 metres at 135 r.p.m. Its specific speed is
What is the correct answer?
4
A ship with jet propulsion draws water through inlet orifices at right angles to the direction of its motion. The propelling force of the jet is (where a = Area of the jet, Vr = Relative velocity of the jet and ship = V + v, v = Velocity of the ship, and V = Velocity of the jet issuing from the ship)
What is the correct answer?
4
Dynamic similarity is said to exist between the model and the prototype, if both of them
A. Have identical velocities
B. Are equal in size and shape
C. Are identical in shape, but differ only in size
What is the correct answer?
4
Power required to drive a centrifugal pump is directly proportional to ________ of its impeller.
D. Fourth power of diameter
What is the correct answer?
4
Braking jet in an impulse turbine is used
A. To break the jet of water
B. To bring the runner to rest in a short time
C. To change the direction of runner
What is the correct answer?
4
A turbine pump is basically a centrifugal pump equipped additionally with
B. Backward curved blades
C. Vaned diffusion casing
What is the correct answer?
4
High specific speed of turbine implies it is
What is the correct answer?
4
The specific speed of a centrifugal pump, delivering 750 litres of water per second against a head of 15 metres at 725 r.p.m., is
What is the correct answer?
4
The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which
A. Delivers unit discharge under unit head
B. Delivers unit discharge under unit speed
C. Develops unit power under unit head
D. Develops unit power under unit speed
What is the correct answer?
4
The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is
A. Slow speed pump with radial flow at outlet
B. Medium speed pump with radial flow at outlet
C. High speed pump with radial flow at outlet
D. High speed pump with axial flow at outlet
What is the correct answer?
4
In a Francis turbine runner, the numbers of blades are generally between
What is the correct answer?
4
By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. The saving in case of a double acting reciprocating pump is
What is the correct answer?
4
Discharge (Q) of a centrifugal pump is given by (where D = Diameter of impeller at inlet, b = Width of impeller at inlet, and Vf = Velocity of flow at inlet)
What is the correct answer?
4
Which of the following turbine is preferred for 0 to 25 m head of water?
What is the correct answer?
4
Which of the following pump is successfully used for lifting water from deep wells?
What is the correct answer?
4
Maximum impulse will be developed in hydraulic ram when
A. Waste valve closes suddenly
What is the correct answer?
4
An impulse turbine is used for