Hydraulic Machines MCQs Most Latest Competitive Mechanical Engineering MCQs
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Latest Mechanical Engineering MCQs
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Latest Hydraulic Machines Mcqs
The most occurred mcqs of Hydraulic Machines in past papers. Past papers of Hydraulic Machines Mcqs. Past papers of Hydraulic Machines Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Hydraulic Machines Mcqs. The Important series of Hydraulic Machines Mcqs are given below:
For starting an axial flow pump, its delivery valve should be____________________?
A. closed
B. open
C. depends on starting condition and flow desired
D. partly open and partly closed
E. could be either open or closed
Centrifugal pump is started with its delivery valve __________________?
A. kept fully closed
B. irrespective of any position
C. kept fully open
D. kept 50% open
E. none of the above
When a piping system is made up primarily of vertical lift and very little pipe friction, the pump characteristics should be _________________?
A. nearly horizontal
B. horizontal
C. steep
D. first rise and then fall
E. none of the above
Multistage centrifugal pumps are used to obtain___________________?
A. pumping of viscous fluids
B. high head
C. high discharge
D. high head and high discharge
E. high efficiency
In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by_______________?
A. not possible
B. trimming the impeller size to the required size by machining
C. designing new impeller
D. some other alterations in the impeller
E. none of the above
One horsepower is equal to_________________?
A. 75 watts
B. 102 watts
C. 550 watts
D. 736 watts
E. 33000 watts
Axial flow pump is started with its delivery valve________________?
A. irrespective of any position
B. kept fully open
C. kept fully closed
D. kept 50% open
E. none of the above
Head developed by a centrifugal pump depends on___________________?
A. speed
B. impeller diameter
C. fluid density
D. type of casing
E. A. and B. above
In a centrifugal pump casing, the flow of water leaving the_______________?
A. radial
B. centrifugal
C. radial
D. rectilinear
E. vortex
Reciprocating pumps are no more to be seen in industrial applications (in comparison to centrifugal pumps) because of____________________?
A. high initial and maintenance cost
B. lower speed of operation
C. lower discharge
D. necessity of air vessel
E. all of the above
In a centrifugal pump casing, the flow of water leaving the impeller, is___________________?
A. radial flow
B. rectilinear flow
C. free vortex motion
D. forced vortex
E. none of the above
The efficiency of a centrifugal pump is maximum when its blades are__________________?
A. bent forward
B. straight
C. bent backward
D. bent forward first and then backward
E. bent backward first and then forward
Engineering Materials Mcqs
When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be__________________?
A. steep
B. nearly horizontal
C. horizontal
D. first rise and then fall
E. none of the above
If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water would discharge_____________________?
A. same quantity of liquid
B. 1.5 Q
C. Q/0.75
D. 0.75 Q
E. none of the above
The optimum value of vane exit angle for a centrifugal pump impeller is_________________?
A. 10-15°
B. 20-25°
C. 50-60°
D. 30-40°
E. 80-90°.
In centrifugal pumps, maximum efficiency is obtained when the blades are_________________?
A. bent forward
B. straight
C. bent backward
D. radial
E. given aerofoil section
In a centrifugal pump, the liquid enters the pump__________________?
A. at the bottom
B. at the top
C. at the center
D. from sides
E. none of the above
Low specific speed of a pump implies it is____________________?
A. centrifugal pump
B. axial flow pump
C. mixed flow pump
D. any one of the above
E. none of the above
For small discharge at high pressure, following pump is preferred_____________________?
A. axial flow
B. centrifugal
C. mixed flow
D. propeller
E. reciprocating
The horse power required in above case will be___________________?
A. B.H.P./0.75
B. 0.75 B.H.P.
C. same
D. 1.5 B.H.P.
E. none of the above
Motion of a liquid in a volute casing of a centrifugal pump is an example of____________________?
A. radial
B. rotational flow
C. forced spiral vortex flow
D. forced cylindrical vortex flow
E. spiral vortex flow
Medium specific speed of a pump implies it is_________________?
A. axial flow pump
B. mixed flow pump
C. centrifugal pump
D. any one of the above
E. none of the above
Indicator diagram of a reciprocating pump is a graph between________________?
A. flow vs speed
B. pressure in cylinder vs swept volume
C. flow vs swept volume
D. pressure vs speed
E. swept volume vs speed
Any change in load is adjusted by adjusting following parameter on turbine______________?
A. absolute velocity
B. net head
C. blade velocity
D. flow
E. relative velocity of flow at inlet
The maximum number of jets generally employed in impulse turbine without jet interference is________________?
A. 8
B. 6
C. 4
D. 12
E. 16.
High specific speed of turbine implies it is__________________?
A. propeller turbine
B. impulse turbine
C. Francis turbine
D. any one of the above
E. none of the above
Casting of a centrifugal pump is designed so as to minimize________________?
A. cavitation
B. friction loss
C. static head
D. loss of kinetic energy
E. starting time
Guide angle as per the aerofoil theory of Kaplan turbine blade design is defined as the angle between_________________?
A. lift and resultant force
B. lift and tangential force
C. drag and resultant force
D. lift and drag
E. resultant force and tangential force
The flow rate in gear pump___________________?
A. decreases with increase in pressure
B. increases with increase in pressure
C. more or less remains constant with in-crease in pressure
D. unpredictable
E. none of the above
Reaction turbines are used for____________________?
A. high head
B. low head
C. high head and low discharge
D. high head and high discharge
E. low head and high discharge
The angle of taper on draft tube is A. greater than 15° B. greater than 8° C. greater than 5° D. less than 8° E. less than 3°.___________________?
The angle of taper on draft tube is
A. greater than 8°
B. greater than 15°
C. greater than 5°
D. less than 8°
E. less than 3°.
In axial flow fans and turbines, fluid enters and leaves as follows________________?
A. axially, radially
B. radially, axially
C. axially, axially
D. radially, radially
E. combination of axial and radial
Air vessels in reciprocating pump are used to__________________?
A. increase pump efficiency
B. reduce acceleration to minimum
C. smoothen flow
D. save pump from cavitation
E. increase pump head
According to fan laws, at constant speed and capacity, the pressure and power vary_____________________?
A. directly as the air or gas density
B. inversely as density
C. inversely as square root of density
D. as square of density
E. as square root of density
Maximum impulse will be developed in hydraulic ram when ___________________?
A. waste valve closes suddenly
B. supply pipe is short
C. supply pipe is long
D. ram chamber is large
E. supply pipe has critical diameter
A hydraulic intensifier normally consists of __________________?
A. a cylinder and a ram
B. two cylinders, two rams and a storage device
C. two co-axial rams and two cylinders
D. a cylinder, a piston, storage tank and control valve
E. special type of pump with storage device and a pressure regulator
Hydraulic accumulator is used for____________________?
A. accumulating hydraulic energy
B. supplying large quantities of oil for very short duration
C. generally high pressures to operate hydraulic machines
D. supplying energy when main supply fails
E. accumulating oil
Puck up the wrong statement about centrifugal pump_______________?
A. discharge a diameter
B. head a diameter
C. head a speed 2
D. Power a speed 3
E. none of the above is wrong
Saving of work done and power by fitting an air vessel to double acting reciprocating pump is of the order of_______________?
A. 39.2%
B. 68.8%
C. 49.2%
D. 84.8%
E. 91.6%.
A hydraulic accumulator normally consists of________________?
A. two co-axial rams and two cylinders
B. a cylinder and a ram
C. two cylinders, two rams and a storage device
D. a cylinder, a piston, storage tank and control valve
E. special type of pump with storage device and a pressure regulator
Fluid Mechanics Mcqs
According to fan laws, at constant weight of air or gas, the speed, capacity and pressure vary________________?
A. inversely as square root of density
B. directly as the air or gas density
C. inversely as density
D. as square of density
E. as square root of density
According to fan laws, for the fans having constant wheel diameters, the power demand varies_______________?
A. square of fan speed
B. directly as fan speed
C. cube of fan speed
D. square root of fan speed
E. none of the above
According to fan laws, at constant pressure, the speed capacity and power vary_________________?
A. inversely as density
B. inversely as square root of density
C. directly as the air or gas density
D. as square of density
E. as square root of density
Pressure intensifier increases the pressure in proportion to____________________?
A. inverse ratio of diameters
B. square of ratio of diameters
C. ratio of diameters
D. square of inverse ratio of diameters
E. fourth power of ratio of diameters
According to fan laws, for fans having constant wheel diameter, the pressure varies________________?
A. directly as fan speed
B. square of fan speed
C. square root of fan speed
D. cube of fan speed
E. none of the above
Saving of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of__________________?
A. 39.2%
B. 68.8%
C. 49.2%
D. 84.8%
E. 91.6%.
According to fan laws, for fans having constant wheel diameter, the air or gas capacity varies______________________?
A. directly as fan speed
B. cube of fan speed
C. square of fan speed
D. square root of fan speed
E. none of the above
Which place in hydraulic turbine is most susceptible for cavitation __________________?
A. inlet of draft rube
B. guide blade
C. blade inlet
D. penstock
E. draft tube exit
Specific speed for reaction turbines ranges from___________________?
A. 80 to 200
B. 10 to 100
C. 0 to 4.5
D. 250 to 300
E. none of the above
The discharge through a reaction turbine with increase in unit speed____________________?
A. remains unaffected
B. decreases
C. increases
D. first increases and then decreases
E. first decreases and then increases
Francis, Kaplan and propeller turbines fall under the category of___________________?
A. Axial flow turbines
B. Reaction turbines
C. Impulse turbines
D. Mixed flow turbines
E. Reaction-cum-impulse turbines
Francis turbine is best suited for_____________________?
A. medium head application from 24 to 180 m
B. high head installation above 180 m
C. low head installation up to 30 m
D. all types of heads
E. none of the above
Impulse turbine is generally fitted______________________?
A. slightly below the tail race
B. little above the tail race
C. at the level of tail race
D. about 2.5 m above the tail race to avoid cavitation
E. about 2.5 m below the tail race to avoid cavitation
In reaction turbine, draft tube is used_____________________?
A. for safety of turbine
B. to convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section
C. to transport water downstream without eddies
D. to increase flow rate
E. none of the above
A turbine pump is basically a centrifugal pump equipped additionally with_________________?
A. backward curved blades
B. adjustable blades
C. vaned diffusion casing
D. inlet guide blades
E. totally submerged operation facility
Medium specific speea of turbine implies it is___________________?
A. impulse turbine
B. Francis turbine
C. propeller turbine
D. any one of the above
E. none of the above
The specific speed of turbine is defined as the speed of a unit___________________?
A. of such a size that it delivers unit dis-charge at unit power
B. of such a size that it delivers unit dis-charge at unit head
C. of such a size that it requires unit power per unit head
D. of such a size that it produces unit horse power with unit head
E. none of the above
Runaway speed of a hydraulic turbine is_________________?
A. the speed at which turbine runner will be damaged
B. full load speed
C. the speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open
D. the speed corresponding to maximum overload permissible
E. none of the above.
Low specific speed of turbine implies it is__________________?
A. Francis turbine
B. propeller turbine
C. impulse turbine
D. any one of the above
E. none of the above
High specific speed of a pump implies it is_____________________?
A. mixed flow pump
B. centrifugal pump
C. axial flow pump
D. any one of the above
E. none of the above
For very high discharge at low pressure such as for flood control and irrigation applications, following type of pump is preferred_________________?
A. reciprocating
B. axial flow
C. centrifugal
D. mixed flow
E. none of the above