NCR Departmental Exam : Hydraulics, Question Bank With Answer

Hydraulics

Fundamental & Symbols

01.01    A push or pull applied against an object to move, it is called a………………:

(a) Force    (b) Pressure                    (c) Torque                  (d) Displacement

01.02   A   hydraulic fluid must have enough force to do work of the system & overcome………... in the system:

(a) Pressure               (b) Resistance             (c) Weight               (d) None of these

01.03    The…………..determines how much force is required to start, stop or cause a change in the movement of an object.

(a) Pressure               (b) Weight                  (c) Inertia        (d) Mass

01.04    The……………… of  a liquid is determined by comparing the weight of the fluid to the weight of an equal amount of water.

(a) Pressure               (b) Force                    (c) Specific Gravity    (d) None of these

01.05    …………is the amount of force exerted on an object divided by the area over which the force is exerted.

(a) Pressure               (b) Hydraulic Force    (c) Torque                  (d) None of these

01.06    …………….takes place when a force is moved through a distance.

(a) Power                  (b) Work                    (c) Acceleration          (d) None of these

01.07    Power is defined as an amount of ………..done in a given amount of time.

(a) Force                   (b) Displacement        (c) Work                     (d) None of these

01.08    If a force of 1000kg is exerted against a piston having an area of 50cm2, the resulting pressure is………………Kg/cm2

(a) 10Kg/cm2                (b) 20Kg/cm2                   (c) 50000Kg/cm2          (d) 200Kg/cm2

01.09    The ideal flow in a pipe is called-

(a) Laminar               (b) Turbulence            (c) Both ‘a’& ‘b’        (d) None of these

01.10    In accordance with Bernoulli’s Principle, when flow increases, pressure will…………

(a) Increase                                  (b) Decrease                    (c) No effect          (d) Either a or b

01.11    The theory stating that pressure in a confined liquid is distributed equally throughout the fluid is……………………

(a) Bernoulli’s law     (b) Boyle’s law            (c) Pascal’s Law       (d) Faraday’s law

01.12    In a hydraulic system, what must the force do?

(a) Perform work      (b) Overcome system resistance (c) Both ‘a’& ‘b’   (d) None

01.13    If two different pistons have a force ratio of 4:1, the movement ratio is…………….

(a) 4:1          (b) 1:4                            (c) 1:6                        (d) 16:1

01.14    Atmospheric pressure on the barometer scale is-

(a) 840mm                (b) 760mm                 (c) 740mm                  (d) None of these

01.15    Liquid seeks a level depending on the-

(a) Force                   (b) Work                    (c) Pressure                (d) Area

01.16    The relationship between Force, Pressure, Area-

(a) F = P x A                        (b) P = FxA                (c) A = FxP                 (d) None

01.17     The basic symbol for a valve is a…………………

(a) Circle                   (b) Square                   (c) Triangle                 (d) None

01.18  …………is the basic symbol for rotating components such as pump & motor..

(a) Circle                   (b) Square                   (c) Triangle                 (d) Rectangle

01.19    Hydraulic returns lines are drawn as …..which carries out leakage oil back to the tank-

(a) Solid line                                  (b) Long dashes          (c) Short dashes          (d) None

01.20     How many positions has the 4/3 way valve.

(a) 2                          (b) 3                (c) 4                (iv) 5

01.21     How many envelops (squares) has the 4/2 way valve.

(a) 2                          (b) 3                (c) 4                (iv) 5

01.22    …….line carries the main stream of flow in the system.

(a) Solid                    (b) Long dashes            (c) Short dashes        (d) Arrow

01.23  The arrow points out         showing the………….. as a source.

(a) Hydraulic Pump        (b) Hydraulic Motor   (c) 4/3 way valve    (d) Relief valve

01.24 The arrow points in        showing the…………….receive hydraulic energy.

(a) Hydraulic Pump        (b) Hydraulic Motor    (c) 4/3 way valve    (d) Accumulator

01.25  The two arrows point in           showing the motor is ………………

(a) Unidirectional             (b) Bidirectional                    (c) Both ‘a’ & ‘b’  (d) None

01.26 The two arrow points out        showing that the pump can operate in ……………..

(a) Forward        (b) Reverse                       (c) Either ‘a’ or ‘b’      (d) None

01.27 ………….Positioning valves such as relief valve, proportional valve has any number of positions between fully open and fully closed.

(a) Finite                        (b) Infinite                   (c) Both ‘a’ & ‘b’   (d) None

01.28 …………..Positioning valves such as directional control valve can be operated in certain no. of positions.

(a) Finite                        (b) Infinite                   (c) Both ‘a’ & ‘b’   (d) None

01.29 In symbol of relief valve, the………….. line indicates operation by pressure.

(a) main         (b) pilot                               (c) return                     (d) None

01.30 In symbol of relief valve, ………….. indicates adjustable the pressure.

(a) main line                   (b) pilot line                 (c) return line          (d) arrow with spring

01.31  ……… line i.e. pilot line carries the fluid that is used to control the operation of a valve or other component.

(a) solid                    (b) Long dashes with dot           (c) Short dashes        (d) Arrow

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