Discharge of a centrifugal pump is (where N = Speed of the pump impeller)
A. Directly proportional to N
B. Inversely proportional to N
C. Directly proportional to N2
D. Inversely proportional to N2
Select an option to see the answer and solution.
A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is
Select an option to see the answer and solution.
When a vertical wall is subjected to pressures due to liquid on both sides, the resultant pressure is the __________ of the two pressures.
A. Sum
B. Difference
C. Arithmetic mean
D. Geometric mean
Select an option to see the answer and solution.
The speed of an imaginary turbine, identical with the given turbine, which will develop a unit power under a unit head, is known as
A. Normal speed
B. Unit speed
C. Specific speed
D. None of these
Select an option to see the answer and solution.
The overall efficiency for a Pelton wheel lies between
A. 0.50 to 0.65
B. 0.65 to 0.75
C. 0.75 to 0.85
D. 0.85 to 0.90
Select an option to see the answer and solution.
A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall per unit length is (where w = Specific weight of liquid and H = Height of liquid)
Select an option to see the answer and solution.
A liquid would wet the solid, if adhesion forces as compared to cohesion forces are
A. Less
B. More
C. Equal
D. Less at low temperature and more at high temperature
Select an option to see the answer and solution.
Which of the following manometer has highest sensitivity?
A. U-tube with water
B. Inclined U-tube
C. U-tube with mercury
D. Micro-manometer with water
Select an option to see the answer and solution.
The viscosity of a liquid __________ its rate of flow through a hole in a vessel.
A. Effects
B. Does not effect
C. Both A and B
D. None of these
Select an option to see the answer and solution.
A uniform body 3 m long, 2 m wide and 1 m deep floats in water. If the depth of immersion is 0.6 m, then the weight of the body is
A. 3.53 kN
B. 33.3 kN
C. 35.3 kN
D. None of these
Select an option to see the answer and solution.
The water pressure per metre length on a vertical masonry wall of dam is (where w = Specific weight of the liquid and H = Height of the liquid)
Select an option to see the answer and solution.
The cavitation in a hydraulic machine
A. Causes noise and vibration of various parts
B. Reduces the discharge of a turbine
C. Causes sudden drop in power output and efficiency
D. All of the above
Select an option to see the answer and solution.
The discharge over a triangular notch is
A. Inversely proportional to H 2 3
B. Directly proportional to H 2 3
C. Inversely proportional to H 2 5
D. Directly proportional to H 2 5
Select an option to see the answer and solution.
The time oscillation of a floating body with increase in meatcentric height will be
A. Same
B. Higher
C. Lower
D. Lower/higher depending on weight of body
Select an option to see the answer and solution.
If the surface of liquid is convex, men
A. Cohesion pressure is negligible
B. Cohesion pressure is decreased
C. Cohesion pressure is increased
D. There is no cohesion pressure
Select an option to see the answer and solution.
The coefficient of discharge for an external mouthpiece depends upon
A. Velocity of liquid
B. Pressure of liquid
C. Area of mouthpiece
D. Length of mouthpiece
Select an option to see the answer and solution.
The value of coefficient of discharge is __________ the value of coefficient of velocity.
A. Less than
B. Same as
C. More than
D. None of these
Select an option to see the answer and solution.
The pressure of a liquid measured with the help of a Piezometer tube is
A. Vacuum pressure
B. Gauge pressure
C. Absolute pressure
D. Atmospheric pressure
Select an option to see the answer and solution.
A body floating in a liquid is said to be in neutral equilibrium, if its metacentre
A. Coincides with its centre of gravity
B. Lies above its centre of gravity
C. Lies below its centre of gravity
D. Lies between the centre of buoyancy and centre of gravity
Select an option to see the answer and solution.
A pipe of length more than double the diameter of orifice fitted externally or internally to the orifice is called a
A. Notch
B. Weir
C. Mouthpiece
D. Nozzle
Select an option to see the answer and solution.