ENST 2361 Fluid Power Systems Mid-Term Exam Review

Question 1

Pressure is not considered one of the five basic components of a hydraulic system. True or false?

Answer 1

True

Question 2

What is the formula for pressure?

Answer 2

Force / Area

Question 3

The pump, reservoir, and prime mover are considered parts of…

Answer 3

A hydraulic power unit

Question 4

Liquid is shown in a hydraulic schematic. True or false?

Answer 4

False

Question 5

Quick connect fittings have a ____ _____ built in.

Answer 5

Check valve

Question 6

What do you use when you want to connect two circuits to a single supply?

Answer 6

Tee fitting

Question 7

Actuator is another name for a…

Answer 7

Cylinder

Question 8

When will a double acting cylinder extend?

Answer 8

When oil flows into the cap end of the cylinder.

Question 9

What do you use to change direction of a fluid?

Answer 9

Directional control valve (DCV)

Question 10

The _____ of a DCV is shifted to different positions by the operator.

Answer 10

Spool

Question 11

What is the formula for flow rate?

Answer 11

Volume / Time

Question 12

What type of flow valve must be oriented in a vertical position?

Answer 12

Rotameters

Question 13

A pump produces _____

Answer 13

Flow

Question 14

Ball, swing, and poppet are all types of ____ _____

Answer 14

Check valves

Question 15

Vane, gear, and piston are all types of _____ ______ _____

Answer 15

Fixed displacement pumps

Question 16

What is the main function of a needle valve?

Answer 16

To control the speed of an actuator.

Question 17

What is the tapered end of a needle valve adjustment screw used for?

Answer 17

To adjust the size of the orifice.

Question 18

The hydraulic motor converts hydraulic fluid into _______ ______ ______

Answer 18

Rotary shaft speed

Question 19

Bent axis, radial, and inline are all types of…

Answer 19

Hydraulic piston motors

Question 20

What law states that pressure in a confined fluid is equal and acts perpendicular to all surfaces?

Answer 20

Pascal’s law

Question 21

A vented reservoir may be shown many times in a schematic without….

Answer 21

Indicating there is more than one

Question 22

Pressure and the area of the bore are values needed to calculate…

Answer 22

The theoretical amount of force created by a cylinder.

Question 23

Pressure is created by the ______ to ____

Answer 23

Resistance, flow

Question 24

What is another name for the pressure differential

Answer 24

Delta P

Question 25

What happens to the pressure as oil is pumped through a hydraulic system?

Answer 25

It drops

Question 26

PSI, PSIA, and PSIG are all ways to state ______

Answer 26

Pressure

Question 27

Flow occurs between two connected points in a hydraulic system when a ______ ______ exists.

Answer 27

Pressure differential

Question 28

What is the formula for the area of a circle?

Answer 28

Pi x Radius²

Question 29

Pilot operated and direct acting are two types of _____ _______ used in hydraulic systems.

Answer 29

Relief valves

Question 30

The pressure at which a relief valve actually starts to open is called the ______ _______.

Answer 30

Cracking pressure

Question 31

What are check valves used for?

Answer 31

To block flow

Question 32

If the load on an actuator is increased, the flow through a non-compensated flow control valve will ________.

Answer 32

Decrease

Question 33

What do you need to know to calculate the extend speed of a cylinder?

Answer 33

Piston diameter and flow rate in.

Question 34

What component allows flow to bypass the system and return to the reservoir?

Answer 34

Relief valves

Question 35

What component is most often used to avoid the cost of an electrical control circuit?

Answer 35

Sequence valves

Question 36

A blocked drain on a sequence valve will cause the valve to _____ ______

Answer 36

Stay closed

Question 37

What is the purpose of a pressure reducing valve?

Answer 37

To drop the pressure in the branch of a circuit.

Question 38

What might be needed with a reverse flow check valve because of the chance of a pressure spike?

Answer 38

Pressure reducing valve

Question 39

Cylinders are sequenced in reverse direction using a _____ ______ _______

Answer 39

Two-sequence valve

Question 40

What happens to system pressure when an actuator becomes extended?

Answer 40

System pressure rises