Hydraulic Machines MCQs

Option A: steam turbines

Option B: water turbines

Option C: combustion turbines

Option D: Gas turbines

Correct Answer: water turbines ✔

Option A: rectilinear flow

Option B: radial flow

Option C: free vortex motion

Option D: forced vortex

Correct Answer: free vortex motion ✔

Option A: centrifugal

Option B: axial flow

Option C: reciprocating

Option D: mixed flow

Correct Answer: axial flow ✔

Option A: centrifugal pump

Option B: mixed flow pump

Option C: axial flow pump

Option D: any one of the above

Correct Answer: axial flow pump ✔

Option A: propeller turbine

Option B: Francis turbine

Option C: impulse turbine

Option D: any one of the above

Correct Answer: impulse turbine ✔

Option A: full load speed

Option B: the speed at which turbine runner will be damaged

Option C: the speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open

Option D: the speed corresponding to maximum overload permissible

Correct Answer: the speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open ✔

Option A: propeller turbine

Option B: Francis turbine

Option C: impulse turbine

Option D: any one of the above

Correct Answer: Francis turbine ✔

Option A: of such a size that it delivers unit dis-charge at unit head

Option B: of such a size that it delivers unit dis-charge at unit power

Option C: of such a size that it requires unit power per unit head

Option D: of such a size that it produces unit horse power with unit head

Correct Answer: of such a size that it produces unit horse power with unit head ✔

Option A: adjustable blades

Option B: backward curved blades

Option C: vaned diffusion casing

Option D: inlet guide blades

Correct Answer: vaned diffusion casing ✔

Option A: to transport water downstream without eddies

Option B: to convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section

Option C: for safety of turbine

Option D: to increase flow rate

Correct Answer: to convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section ✔

Option A: at the level of tail race

Option B: little above the tail race

Option C: slightly below the tail race

Option D: about 2.5 m above the tail race to avoid cavitation

Correct Answer: little above the tail race ✔

Option A: medium head application from 24 to 180 m

Option B: low head installation up to 30 m

Option C: high head installation above 180 m

Option D: all types of heads

Correct Answer: medium head application from 24 to 180 m ✔

Option A: Impulse turbines

Option B: Reaction turbines

Option C: Axial flow turbines

Option D: Mixed flow turbines

Correct Answer: Reaction turbines ✔

Option A: increases

Option B: decreases

Option C: remains unaffected

Option D: first increases and then decreases

Correct Answer: decreases ✔

Option A: 0 to 4.5

Option B: 10 to 100

Option C: 80 to 200

Option D: 250 to 300

Correct Answer: 10 to 100 ✔

Option A: inlet of draft rube

Option B: blade inlet

Option C: guide blade

Option D: penstock

Correct Answer: inlet of draft rube ✔

Option A: directly as fan speed

Option B: square of fan speed

Option C: cube of fan speed

Option D: square root of fan speed

Correct Answer: directly as fan speed ✔

Option A: 39.2%

Option B: 49.2%

Option C: 68.8%

Option D: 84.8%

Correct Answer: 84.8% ✔

Option A: directly as fan speed

Option B: square of fan speed

Option C: cube of fan speed

Option D: square root of fan speed

Correct Answer: square of fan speed ✔

Option A: ratio of diameters

Option B: square of ratio of diameters

Option C: inverse ratio of diameters

Option D: square of inverse ratio of diameters

Correct Answer: ratio of diameters ✔

Option A: directly as the air or gas density

Option B: inversely as square root of density

Option C: inversely as density

Option D: as square of density

Correct Answer: inversely as square root of density ✔

Option A: directly as fan speed

Option B: square of fan speed

Option C: cube of fan speed

Option D: square root of fan speed

Correct Answer: cube of fan speed ✔

Option A: directly as the air or gas density

Option B: inversely as square root of density

Option C: inversely as density

Option D: as square of density

Correct Answer: inversely as density ✔

Option A: two cylinders, two rams and a storage device

Option B: a cylinder and a ram

Option C: two co-axial rams and two cylinders

Option D: a cylinder, a piston, storage tank and control valve

Correct Answer: a cylinder and a ram ✔

Option A: 39.2%

Option B: 49.2%

Option C: 68.8%

Option D: 84.8%

Correct Answer: 39.2% ✔

Option A: discharge a diameter

Option B: head a speed2

Option C: head a diameter

Option D: Power a speed3

Correct Answer: discharge a diameter ✔

Option A: accumulating oil

Option B: supplying large quantities of oil for very short duration

Option C: generally high pressures to operate hydraulic machines

Option D: supplying energy when main supply fails

Correct Answer: supplying energy when main supply fails ✔

Option A: two cylinders, two rams and a storage device

Option B: a cylinder and a ram

Option C: two co-axial rams and two cylinders

Option D: a cylinder, a piston, storage tank and control valve

Correct Answer: two co-axial rams and two cylinders ✔

Option A: waste valve closes suddenly

Option B: supply pipe is long

Option C: supply pipe is short

Option D: ram chamber is large

Correct Answer: waste valve closes suddenly ✔

Option A: directly as the air or gas density

Option B: inversely as square root of density

Option C: inversely as density

Option D: as square of density

Correct Answer: directly as the air or gas density ✔

Option A: smoothen flow

Option B: reduce acceleration to minimum

Option C: increase pump efficiency

Option D: save pump from cavitation

Correct Answer: reduce acceleration to minimum ✔

Option A: radially, axially

Option B: axially, radially

Option C: axially, axially

Option D: radially, radially

Correct Answer: axially, axially ✔

Option A: greater than 15°

Option B: greater than 8°

Option C: greater than 5°

Option D: less than 8°

Correct Answer: less than 8° ✔

Option A: low head

Option B: high head

Option C: high head and low discharge

Option D: high head and high discharge

Correct Answer: low head ✔

Option A: increases with increase in pressure

Option B: decreases with increase in pressure

Option C: more or less remains constant with in-crease in pressure

Option D: unpredictable

Correct Answer: more or less remains constant with in-crease in pressure ✔

Option A: lift and resultant force

Option B: drag and resultant force

Option C: lift and tangential force

Option D: lift and drag

Correct Answer: lift and resultant force ✔

Option A: friction loss

Option B: cavitation

Option C: static head

Option D: loss of kinetic energy

Correct Answer: loss of kinetic energy ✔

Option A: propeller turbine

Option B: Francis turbine

Option C: impulse turbine

Option D: any one of the above

Correct Answer: propeller turbine ✔

Option A: 4

Option B: 6

Option C: 8

Option D: 12

Correct Answer: 6 ✔

Option A: net head

Option B: absolute velocity

Option C: blade velocity

Option D: flow

Correct Answer: flow ✔

Option A: flow vs swept volume

Option B: pressure in cylinder vs swept volume

Option C: flow vs speed

Option D: pressure vs speed

Correct Answer: pressure in cylinder vs swept volume ✔

Option A: centrifugal pump

Option B: mixed flow pump

Option C: axial flow pump

Option D: any one of the above

Correct Answer: mixed flow pump ✔

Option A: rotational flow

Option B: radial

Option C: forced spiral vortex flow

Option D: forced cylindrical vortex flow

Correct Answer: spiral vortex flow ✔

Option A: same

Option B: 0.75 B.H.P.

Option C: B.H.P./0.75

Option D: 1.5 B.H.P.

Correct Answer: 0.75 B.H.P. ✔

Option A: centrifugal

Option B: axial flow

Option C: mixed flow

Option D: propeller

Correct Answer: reciprocating ✔

Option A: centrifugal pump

Option B: mixed flow pump

Option C: axial flow pump

Option D: any one of the above

Correct Answer: centrifugal pump ✔

Option A: at the top

Option B: at the bottom

Option C: at the center

Option D: from sides

Correct Answer: at the center ✔

Option A: straight

Option B: bent forward

Option C: bent backward

Option D: radial

Correct Answer: bent backward ✔

Option A: 10-15°

Option B: 20-25°

Option C: 30-40°

Option D: 50-60°

Correct Answer: 20-25° ✔

Option A: same quantity of liquid

Option B: 0.75 Q

Option C: Q/0.75

Option D: 1.5 Q

Correct Answer: same quantity of liquid ✔

Option A: horizontal

Option B: nearly horizontal

Option C: steep

Option D: first rise and then fall

Correct Answer: horizontal ✔

Option A: straight

Option B: bent forward

Option C: bent backward

Option D: bent forward first and then backward

Correct Answer: bent backward ✔

Option A: high initial and maintenance cost

Option B: lower discharge

Option C: lower speed of operation

Option D: necessity of air vessel

Correct Answer: high initial and maintenance cost ✔

Option A: radial

Option B: radial

Option C: centrifugal

Option D: rectilinear

Correct Answer: vortex ✔

Option A: impeller diameter

Option B: speed

Option C: fluid density

Option D: type of casing

Correct Answer: E. A. and B. above ✔

Option A: kept fully closed

Option B: kept fully open

Option C: irrespective of any position

Option D: kept 50% open

Correct Answer: kept fully open ✔

Option A: 102 watts

Option B: 75 watts

Option C: 550 watts

Option D: 736 watts

Correct Answer: 736 watts ✔

Option A: designing new impeller

Option B: trimming the impeller size to the required size by machining

Option C: not possible

Option D: some other alterations in the impeller

Correct Answer: trimming the impeller size to the required size by machining ✔

Option A: high discharge

Option B: high head

Option C: pumping of viscous fluids

Option D: high head and high discharge

Correct Answer: high head ✔

Option A: horizontal

Option B: nearly horizontal

Option C: steep

Option D: first rise and then fall

Correct Answer: steep ✔

Option A: kept fully closed

Option B: kept fully open

Option C: irrespective of any position

Option D: kept 50% open

Correct Answer: kept fully closed ✔

Option A: closed

Option B: open

Option C: depends on starting condition and flow desired

Option D: could be either open or closed

Correct Answer: open ✔