Question 1

What is the main function of a hydraulic cylinder?

Accepted Answer

Converts fluid pressure and flow into linear mechanical force and movement

Answer

Controls fluid temperature

Answer

Generates electricity from fluid pressure

Answer

Stores hydraulic fluid for reuse

Question 2

What determines the force generated by a hydraulic cylinder?

Accepted Answer

Piston area and system pressure

Answer

Rod length and fluid temperature

Answer

Cylinder weight and piston length

Answer

Pump speed and valve position

Question 3

What is a single-acting cylinder?

Accepted Answer

A cylinder that exerts force in only one direction

Answer

A cylinder with two rods

Answer

A cylinder that rotates continuously

Answer

A cylinder that works without any external force

Question 4

How is a double-acting cylinder different from a single-acting cylinder?

Accepted Answer

It exerts force during both extension and retraction

Answer

It only moves the rod during retraction

Answer

It requires external gears to operate

Answer

It only works using gravity

Question 5

Why does a double-acting cylinder generate less force during retraction?

Accepted Answer

The effective piston area is reduced due to the rod

Answer

The system pressure is halved

Answer

The rod is moving against gravity

Answer

Fluid bypasses the piston during retraction

Question 6

What construction type uses external rods to hold the cylinder together?

Accepted Answer

Tie-rod cylinder

Answer

Mill cylinder

Answer

One-piece cylinder

Answer

Threaded-end cylinder

Question 7

What is a drawback of tie-rod cylinders?

Accepted Answer

Exposed rods can be damaged and attract dirt

Answer

They only function with high-pressure systems

Answer

They are too compact for industrial use

Answer

They cannot be used with hydraulic fluids

Question 8

What defines a threaded-end cylinder?

Accepted Answer

Head and cap are attached using machine threads

Answer

It rotates instead of moving linearly

Answer

Barrel is permanently sealed with welds

Answer

Rod is not included in the design

Question 9

What is true about one-piece cylinders?

Accepted Answer

They cannot be disassembled for service

Answer

They are designed for continuous operation

Answer

They are the most durable option for industrial settings

Answer

They include adjustable piston stops

Question 10

What is a key benefit of double-rod-end cylinders?

Accepted Answer

Equal force and speed during extension and retraction

Answer

Smaller overall size

Answer

Increased dirt resistance

Answer

No need for hydraulic fluid

Question 11

What is a disadvantage of double-rod-end cylinders?

Accepted Answer

Increased overall length

Answer

Lower force output

Answer

Lower pressure tolerance

Answer

Only works with gas systems

Question 12

What parameter is not used when selecting a cylinder?

Accepted Answer

Color of the cylinder

Answer

Flow rate

Answer

Extension/retraction force

Answer

Speed

Question 13

How is extension force (Ef) calculated?

Accepted Answer

System pressure × piston area

Answer

System volume ÷ rod area

Answer

Cylinder diameter + fluid density

Answer

Rod length × piston width

Question 14

How is retraction speed different from extension speed?

Accepted Answer

Retracts faster due to smaller effective area

Answer

It is determined only by system pressure

Answer

It always takes more time to retract

Answer

Retraction uses no fluid flow

Question 15

What is the system pressure formula?

Accepted Answer

Cylinder force ÷ effective piston area

Answer

Cylinder length + fluid rate

Answer

Cylinder speed × rod area

Answer

Rod area × flow rate

Question 16

What causes variation in cylinder speed?

Accepted Answer

Effective volume and fluid flow

Answer

Ambient air pressure

Answer

Hydraulic fluid color

Answer

Direction of the rod motion

Question 17

Why are limited-rotation hydraulic actuators used?

Accepted Answer

To provide torque in confined spaces

Answer

To pressurize tanks

Answer

To cool hydraulic fluid

Answer

To maintain continuous rotation

Question 18

What is a ‘torque motor’ also known as?

Accepted Answer

Limited-rotation actuator

Answer

Hydraulic accumulator

Answer

Pressure reducer

Answer

Flow divider

Question 19

What mechanism drives the pinion in a rack-and-pinion actuator?

Accepted Answer

Cylinder/piston/rack sets

Answer

Electric motors

Answer

Chain drives

Answer

Centrifugal gears

Question 20

What determines torque output in a rack-and-pinion actuator?

Accepted Answer

Piston area × system pressure × gear pitch radius

Answer

Cylinder length × fluid viscosity

Answer

Rod diameter × piston speed

Answer

Rod stroke × pump speed

Question 21

What is a limitation of vane actuators?

Accepted Answer

They can leak around the vane seals

Answer

They are incapable of producing torque

Answer

They are only available in manual configurations

Answer

They cannot be used with hydraulic fluid

Question 22

Why do vane actuators need external stops?

Accepted Answer

To prevent over-rotation in high-speed applications

Answer

To measure pressure drop

Answer

To regulate system pressure

Answer

To allow continuous rotation

Question 23

How does a helical piston and rod actuator produce rotation?

Accepted Answer

Via helical grooves that convert linear motion to rotation

Answer

By gears inside the piston

Answer

Using multiple vanes inside the housing

Answer

By friction with the barrel

Question 24

What is a key feature of helical piston actuators?

Accepted Answer

High torque output in a small size

Answer

They are the slowest type of actuator

Answer

Require no hydraulic pressure

Answer

They are only used in automotive brakes

Question 25

What is a hydraulic motor also called?

Accepted Answer

Rotary actuator

Answer

Torque valve

Answer

Fluid governor

Answer

Reciprocating pump

Question 26

What determines torque in a hydraulic motor?

Accepted Answer

System pressure and geometry of internal parts

Answer

Valve position and rod area

Answer

Pump size and fluid color

Answer

Piston weight and fluid temperature

Question 27

What design is used in a balanced motor?

Accepted Answer

Equal pressure on opposing sides of the bearings

Answer

Unsealed housing

Answer

Free-floating pistons

Answer

One-sided pressure distribution

Question 28

What distinguishes a fixed-displacement motor?

Accepted Answer

Its internal volume per revolution cannot be adjusted

Answer

It does not use fluid for operation

Answer

It changes speed automatically

Answer

It has variable output torque

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