Hydraulics and Pneumatics
JKSSB Junior Engineer (Mechanical) · Fluid Mechanics & Machinery · 22 practice questions with answers and explanations: 7 Easy, 15 Medium, 0 Hard.
Sample questions
Sample Easy question 1
A gear pump is a:
- positive displacement pump
- jet pump
- centrifugal pump
- axial flow pump
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Answer: A. It delivers a fixed volume per revolution.
Sample Easy question 2
The reservoir of a hydraulic system serves to:
- increase the pressure
- store the fluid and help in dissipating heat
- reduce the flow
- drive the pump
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Answer: B. It also lets air and contaminants settle out.
Sample Easy question 3
An air receiver in a pneumatic system:
- heats the air
- reduces the pressure to zero
- stores compressed air and damps the pressure pulsations
- dries the air completely
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Answer: C. It provides a buffer for demand variations.
Sample Medium question 4
A hydraulic accumulator is used to:
- increase the viscosity of oil
- store energy in the form of pressurised fluid
- measure pressure
- cool the oil
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Answer: B. It supplies fluid quickly and smooths pressure surges.
Sample Medium question 5
A hydraulic ram:
- uses the kinetic energy of a large flow of water to lift a small part of it to a higher level
- needs an electric motor
- pumps air
- works only with oil
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Answer: A. Water hammer pressure forces a part of the water up a delivery pipe.
Sample Medium question 6
A pressure reducing valve:
- stops the flow
- raises the system pressure
- maintains a lower, constant pressure in a branch of the circuit
- drains the reservoir
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Answer: C. It protects a branch needing a lower pressure.