Hydraulic Machines

1. A hydraulic accumulator normally consists of

1. two cylinders, two rams and a storage device
2. a cylinder and a ram
3. two co-axial rams and two cylinders
4. a cylinder, a piston, storage tank and control valve
5. special type of pump with storage device and a pressure regulator.

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2. A hydraulic intensifier normally consists of

1. two cylinders, two rams and a storage device
2. a cylinder and a ram
3. two co-axial rams and two cylinders
4. a cylinder, a piston, storage tank and control valve
5. special type of pump with storage device and a pressure regulator.

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3. A turbine pump is basically a centrifugal pump equipped additionally with

1. adjustable blades
2. backward curved blades
3. vaned diffusion casing
4. inlet guide blades
5. totally submerged operation facility.

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4. According to fan laws, at constant pressure, the speed capacity and power vary

1. directly as the air or gas density
2. inversely as square root of density
3. inversely as density
4. as square of density
5. as square root of density.

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5. According to fan laws, at constant speed and capacity, the pressure and power vary

1. directly as the air or gas density
2. inversely as square root of density
3. inversely as density
4. as square of density
5. as square root of density.

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6. According to fan laws, at constant weight of air or gas, the speed, capacity and pressure vary

1. directly as the air or gas density
2. inversely as square root of density
3. inversely as density
4. as square of density
5. as square root of density.

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7. According to fan laws, for fans having constant wheel diameter, the air or gas capacity varies

1. directly as fan speed
2. square of fan speed
3. cube of fan speed
4. square root of fan speed
5. none of the above.

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8. According to fan laws, for fans having constant wheel diameter, the pressure varies

1. directly as fan speed
2. square of fan speed
3. cube of fan speed
4. square root of fan speed
5. none of the above.

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9. According to fan laws, for the fans having constant wheel diameters, the power demand varies

1. directly as fan speed
2. square of fan speed
3. cube of fan speed
4. square root of fan speed
5. none of the above.

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10. Air vessels in reciprocating pump are used to

1. smoothen flow
2. reduce acceleration to minimum
3. increase pump efficiency
4. save pump from cavitation
5. increase pump head.

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