০০। A centrifugal pump will start delivering liquid only when the pressure rise in the impeller is equal to the
ক) kinetic head
খ) velocity head
গ) manometric head
ঘ) static head
০১। A double overhung Pelton wheel has
ক) two jets
খ) two runners
গ) four jets
ঘ) four runners
০২। A draft tube is used with impulse turbines.
ক) Yes
খ) No
০৩। A Francis turbine is an outward flow reaction turbine.
ক) True
খ) False
০৪। A Francis turbine is used when the available head of water is
ক) 0 to 25 m
খ) 25 m to 250 m
গ) above 250 m
ঘ) none of these
০৫। A hydraulic accumulator is a device used to store __________ energy which may be supplied to a machine later on.
ক) strain
খ) pressure
গ) kinetic
০৬। A hydraulic coupling belongs to the category of
ক) power absorbing machines
খ) power developing machines
গ) energy transfer machines
ঘ) energy generating machines
০৭। A hydraulic intensifier is a device used to increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure.
ক) Correct
খ) Incorrect
০৮। A hydraulic press is a device used
ক) to store pressure energy which may be supplied to a machine later on
খ) to increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure
গ) to lift larger load by the application of a comparatively much smaller force
ঘ) all of the above
০৯। A hydraulic ram is a device used to
ক) store the energy of water
খ) increase the pressure of water
গ) to lift water from deep wells
ঘ) to lift small quantity of water to a greater height when a large quantity of water is available at a smaller height
১০। A jet of water enters and leaves a fixed curved vane tangentially. The force of jet along perpendicular to the vane is zero.
ক) True
খ) False
১১। A jet of water enters and leaves a fixed curved vane tangentially. The force of the jet along normal to the vane is (where α and β = Inlet and outlet angles of the jet respectively)
ক)
খ)
গ)
ঘ)
১২। A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is __________ of the jet velocity
ক) one-half
খ) one-third
গ) two-third
ঘ) three-fourth
১৩। A Kaplan turbine is an axial flow reaction turbine.
ক) Correct
খ) Incorrect
১৪। A Kaplan turbine is preferred for a specific speed of 300 to 1000 r.p.m.
ক) Yes
খ) No
১৫। A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit discharge of wheel is
ক) 0.25 m3/s
খ) 0.5 m3/s
গ) 1.5 m3/s
ঘ) 2.5 m3/s
১৬। A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit power of the wheel is
ক) 0.25 kW
খ) 0.75 kW
গ) 1.75 kW
ঘ) 3.75 kW
১৭। A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit speed of the wheel is
ক) 10 r.p.m.
খ) 20 r.p.m.
গ) 40 r.p.m.
ঘ) 80 r.p.m.
১৮। A Pelton wheel is
ক) tangential flow impulse turbine
খ) inward flow impulse turbine
গ) outward flow impulse turbine
ঘ) inward flow reaction turbine
১৯। A Pelton wheel with one nozzle is preferred for a specific speed between 35 to 60 r.p.m.