Engineering :: Hydraulics Machines

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81.

The impeller of a centrifugal pump may have

A.	volute casing	B.	volute casing with guide blades
C.	vortex casing	D.	any one of these

82.

In the casing of a centrifugal pump, the kinetic energy of the water is converted into pressure energy before the water leaves the casing.

True

False

83.

Manometric head, in case of a centrifugal pump, is equal to

A.	Suction lift + Loss of head in suction pipe due to driction + Delivery lift + Loss of head in delivery pipe due to friction + Velocity head in the delivery pipe	B.	Workdone per kN of water - Losses within the impeller
C.	Energy per kN at outlet of impeller - Energy per kN at inlet of impeller	D.	all of the above

84.

In a centrifugal pump, the regulating valve is provided on the

A.	casing	B.	delivery pipe
C.	suction pipe	D.	impeller

85.

Manometric head is the actual head of water against which a centrifugal pump has to work

Right

Wrong

86.

The static head of a centrifugal pump is equal to the

A.	product	B.	difference
C.	sum

87.

Mechanical efficiency of a centrifugal pump is the ratio of

A.	energy available at the impeller to the energy supplied to the pump by the prime mover	B.	actual workdone by the pump to the energy supplied to the sump by the prime mover
C.	energy supplied to the pump to the energy available at the impeller	D.	manometric head to the energy supplied by the impeller per kN of water

88.

Overall efficiency of a centrifugal pump is the ratio of

A.	energy available at the impeller to the energy supplied to the pump by the prime mover	B.	actual workdone by the pump to the energy supplied to the pump by the prime mover
C.	energy supplied to the pump to the energy available at the impeller	D.	manometric head to the energy supplied by the impeller per kN of water

89.

The ratio of quantity of liquid discharged per second from the pump to the quantity of liquid passing per second through the impeller is known as

A.	manometric efficiency	B.	mechanical efficiency
C.	overall efficiency	D.	volumetric efficiency

90.

The efficiency of a centrifugal pump will be maximum when the blades are bent backward.

Yes