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Hydraulic Machines

Free 61+ Hydraulic Machines MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Practise below with answers and explanations.

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Hydraulic Machines — MCQs for Pakistan government job tests

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Hydraulic Machines

Practice questions

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1.What type of flow does water exhibit as it exits the impeller inside a centrifugal pump casing?

Straight-line flowOutward radial flowFree vortex flowForced vortex flowNone of these

2.Which type of pump is most suitable for handling extremely high flow rates at low pressure, commonly used in flood management and irrigation?

radial flow pumpaxial flow pumppositive displacement pumpmixed flow pumpnot listed here

3.What type of pump is indicated by a high specific speed value?

A centrifugal type pumpA pump with mixed flow characteristicsAn axial flow type pumpAny of the mentioned pump typesNone of these options

4.What type of turbine is indicated by a low specific speed?

Propeller type turbineFrancis type turbineImpulse type turbineAny of the above turbinesNone of these options

5.What is meant by the runaway speed of a hydraulic turbine?

The speed at full operational loadThe velocity at which the turbine blades sustain damageThe speed attained when the turbine runner spins freely without any load and with the wicket gates fully openThe speed related to the highest allowable overloadNone of the above options

6.Which type of turbine is characterized by having a medium-specific speed?

A turbine with propeller designA Francis turbineAn impulse turbineAny of the turbines mentioned aboveNone of the turbines listed

7.How is the specific speed of a turbine defined in terms of its operational parameters?

A turbine size that delivers a unit flow rate under a unit headA turbine dimension that provides unit flow rate at unit power outputA turbine scale that consumes unit power for each unit headA turbine size that generates one unit of horsepower at a unit headNone of the mentioned definitions

8.What additional feature distinguishes a turbine pump from a standard centrifugal pump?

blades that can be adjustedblades curved backwarda casing with vaned diffusersguide blades at the inletcapability for fully submerged operation

9.What is the primary function of the draft tube in a reaction turbine?

To carry water downstream while preventing turbulenceTo transform kinetic energy into pressure energy through a gradual increase in flow areaTo ensure the turbine operates safelyTo boost the velocity of the water flowNone of the listed purposes

10.Where is an impulse turbine typically installed in relation to the tail race?

Exactly at the tail race levelJust above the tail raceSlightly beneath the tail raceApproximately 2.5 meters above the tail race to prevent cavitationAround 2.5 meters below the tail race to prevent cavitation

11.For which range of water head is a Francis turbine most appropriately designed?

Medium head conditions ranging between 24 and 180 metersLow head scenarios up to 30 metersHigh head situations exceeding 180 metersSuitable for all head rangesNone of the above options

12.Which classification do Francis, Kaplan, and propeller turbines belong to?

Impulse type turbinesReaction type turbinesTurbines with axial flowTurbines with mixed flowTurbines combining reaction and impulse

13.How does the flow rate through a reaction turbine change when the speed of the unit is increased?

It risesIt reducesIt stays constantIt initially rises and then fallsIt initially falls and then rises

14.What is the typical range of specific speed for reaction turbines?

Between 0 and 4.5From 10 up to 100Within 80 to 200Ranging from 250 to 300None of these ranges

15.In a hydraulic turbine, which location is most prone to cavitation?

Entrance of the draft tubeLeading edge of the turbine bladeStationary guide vanesPenstock sectionOutlet of the draft tube

16.Based on the fan laws, how does the airflow rate change for fans with a fixed wheel diameter when the fan speed varies?

Proportionally to the fan speedProportional to the square of the fan speedProportional to the cube of the fan speedProportional to the square root of the fan speedNone of the above

17.What is the approximate percentage of work and power saved by installing an air vessel on a single-acting reciprocating pump?

39.2 percent49.2 percent68.8 percent84.8 percent91.6 percent

18.Based on fan laws, how does the pressure change for fans with a fixed wheel diameter when the fan speed varies?

Proportional to the fan speedProportional to the square of the fan speedProportional to the cube of the fan speedProportional to the square root of the fan speedNone of the listed options

19.A pressure intensifier raises the pressure according to which of the following?

The ratio of the diametersThe square of the diameter ratioThe inverse of the diameter ratioThe square of the inverse diameter ratioThe diameter ratio raised to the fourth power

20.Based on fan laws, when pressure remains constant, how do speed, capacity, and power change with respect to air or gas density?

Proportionally to the air or gas densityInversely proportional to the square root of the densityInversely proportional to the densityProportional to the square of the densityProportional to the square root of the density

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How to prepare with Hydraulic Machines MCQs

Work through questions topic by topic, then revisit any you answered incorrectly.
Read explanations carefully—they often cover facts that repeat across PPSC, FPSC, and NTS papers.
Pair subject practice with past papers to see how Hydraulic Machines appears in real exam conditions.

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