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Hydraulic machines
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ The overall efficiency for a Pelton wheel lies between. 0.85 to 0.90 [other wrong options] [Discuss in forum] 0.50 to 0.65 0.65 to 0.75 0.75 to 0.85 |
Q22 ⇒ A double overhung Pelton wheel has. two runners [other wrong options] [Discuss in forum] two jets four jets four runners |
Q23 ⇒ A hydraulic press is a device used. to lift larger load by the application of a comparatively much smaller force [other wrong options] [Discuss in forum] to store pressure energy which may be supplied to a machine later on to increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure all of the above |
Q24 ⇒ The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is. slow speed pump with radial flow at outlet [other wrong options] [Discuss in forum] medium speed pump with radial flow at outlet high speed pump with radial flow at outlet high speed pump with axial flow at outlet |
Q25 ⇒ The action of a centrifugal pump is that of a reversed reaction turbine. Correct [other wrong options] [Discuss in forum] Incorrect Both (a) and (b) None of these |
Q26 ⇒ The kinematic viscosity is the. ratio of absolute viscosity to the density of the liquid [other wrong options] [Discuss in forum] ratio of density of the liquid to the absolute viscosity product of absolute viscosity and density of the liquid product of absolute viscosity and mass of the liquid |
Q27 ⇒ In a venturimeter, the velocity of liquid at throat is __________ than at inlet. higher [other wrong options] [Discuss in forum] lower both (a) and (b) none of these |
Q28 ⇒ If Hg is the gross or total head and hf is the head lost due to friction, then net or effective head (H) is given by. H = Hg - hf [other wrong options] [Discuss in forum] H = Hg/hf H = Hg x hf H = Hg + hf |
Q29 ⇒ A manometer is used to measure. high pressure [other wrong options] [Discuss in forum] low pressure moderate pressure atomospheric pressure |
Q30 ⇒ The power produced by the reaction turbine is __________ to the head of water. directly proportional [other wrong options] [Discuss in forum] inversely proportional both (a) and (b) none of these. |
Q31 ⇒ Whenever a plate is held immersed at some angle with the direction of flow of the liquid, it is subjected to some pressure. The component of this pressure, at right angles to the direction of flow of the liquid is known as lift. True [other wrong options] [Discuss in forum] False Both (a) and (b) None of these |
Q32 ⇒ The efficiency of a Pelton wheel working under constant head __________ with the increase in power. increases [other wrong options] [Discuss in forum] remains same decreases none of these. |
Q33 ⇒ Which of the following statement is wrong? The length of divergent portion in a venturimeter is equal to the convergent portion. [other wrong options] [Discuss in forum] A flow whose streamline is represented by a curve, is called two dimensional flow. The total energy of a liquid particle is the sum of potential energy, kinetic energy and pressure energy. A pitot tube is used to measure the velocity of flow at the required point in a pipe. |
Q34 ⇒ 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). Q = Ï€.D.b.Vf [other wrong options] [Discuss in forum] Q = Ï€.D.Vf Q = Ï€.b.Vf Q = D.b.Vf |
Q35 ⇒ A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if. loss of head and discharge of both the pipes is same [other wrong options] [Discuss in forum] length of both the pipes is same diameter of both the pipes is same loss of head and velocity of flow in both the pipes is same |
Q36 ⇒ Manometric head, in case of a centrifugal pump, is equal to. all of the above [other wrong options] [Discuss in forum] Suction lift + Loss of head in suction pipe due to friction + Delivery lift + Loss of head in delivery pipe due to friction + Velocity head in the delivery pipe Workdone per kN of water - Losses within the impeller Energy per kN at outlet of impeller - Energy per kN at inlet of impeller |
Q37 ⇒ An air vessel is provided at the summit in a syphon to. avoid interruption in the flow [other wrong options] [Discuss in forum] increase discharge increase velocity maintain pressure difference |
Q38 ⇒ Dynamic similarity is said to exist between the model and the prototype, if both of them. none of the above [other wrong options] [Discuss in forum] have identical velocities are equal in size and shape are identical in shape, but differ only in size |
Q39 ⇒ Which of the following statement is correct ? all of the above [other wrong options] [Discuss in forum] In a compressible flow, the volume of the flowing liquid changes during the flow. A flow in which the volume of the flowing liquid does not change, is called incompressible flow. When the particles rotate about their own axes while flowing, the flow is said to be rotational flow. |
Q40 ⇒ In a mixed flow reaction turbine, the flow of water is partly radial and partly axial. Correct [other wrong options] [Discuss in forum] Incorrect Both (a) and (b) None of these |
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