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51. Maximum impulse will be developed in hydraulic ram when ___________________?
A. waste valve closes suddenly
B. supply pipe is long
C. supply pipe is short
D. ram chamber is large
E. supply pipe has critical diameter
52. A hydraulic intensifier normally consists of __________________?
A. two cylinders, two rams and a storage device
B. a cylinder and a ram
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
53. Hydraulic accumulator is used for____________________?
A. accumulating oil
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 hydraulic energy
54. Puck up the wrong statement about centrifugal pump_______________?
A. discharge a diameter
B. head a speed2
C. head a diameter
D. Power a speed3
E. none of the above is wrong
55. 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. 49.2%
C. 68.8%
D. 84.8%
E. 91.6%.
56. A hydraulic accumulator normally consists of________________?
A. two cylinders, two rams and a storage device
B. a cylinder and a ram
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
57. According to fan laws, at constant weight of air or gas, the speed, capacity and pressure vary________________?
A. directly as the air or gas density
B. inversely as square root of density
C. inversely as density
D. as square of density
E. as square root of density
58. According to fan laws, for the fans having constant wheel diameters, the power demand varies_______________?
A. directly as fan speed
B. square of fan speed
C. cube of fan speed
D. square root of fan speed
E. none of the above
59. According to fan laws, at constant pressure, the speed capacity and power vary_________________?
A. directly as the air or gas density
B. inversely as square root of density
C. inversely as density
D. as square of density
E. as square root of density
60. Pressure intensifier increases the pressure in proportion to____________________?
A. ratio of diameters
B. square of ratio of diameters
C. inverse ratio of diameters
D. square of inverse ratio of diameters
E. fourth power of ratio of diameters