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HHP2 Final Fall 2025

Total questions: 35

Worksheet time: 18mins

Name
Class
Date
1.

When NFC pressure drops, main spool is shifted _____, blocking flow to servo’s large end and draining its oil

a)

Right

b)

Left

c)

Laterally

d)

Up

e)

Down

2.

The power control piston senses ______ oil pressures

a)

Main

b)

Upstroked

c)

Control

d)

Three

e)

Both

3.

Small servo end shifts piston left, _____ pump

a)

Upstroking

b)

Blocking

c)

Unloading

d)

De-Pressurizing

e)

Activating

4.

Whenever the DCVs are in neutral, the NFC orifice and NFC relief valves establish ______ pressure

a)

Orifice

b)

Pump

c)

Main

d)

Control

e)

NFC

5.

NFC systems: Upstroke pump when signal pressure ________.

a)

Raises

b)

Stalls

c)

Levels Out

d)

Drops

e)

Is Detected

6.

NFC systems: Use ______ pumps

a)

Fixed-Displacement

b)

Variable-displacement

c)

Scroll Type

d)

Signal Limiting

e)

Gear

7.

When servo piston moves, main feedback shifts main spool _____.

a)

Slightly

b)

Completely

c)

From Right to Left

d)

From Left to Right

e)

Instantly

8.

200 psi = ____ Bar?

a)

12

b)

14

c)

15

d)

18

e)

19

9.

NFC ______ passageways can be connected in parallel, series, or tandem

a)

Main

b)

Bypass

c)

Secondary

d)

Power Core

e)

High Flow

10.

A normally closed minimum-flow solenoid can also be placed in series with the _______ orifice.

a)

Minimum-Flow

b)

Maximum-Flow

c)

In-Line

d)

Up-Stroked

e)

De-Stroked

11.

Husco Flow Summation 

  • Incorporates unique _____ open-center DCVs. 

a)

3-way

b)

4-way

c)

6-way

d)

7-way

e)

  • 8-way

12.

Flow Summation Node 

  • Completes ____ tasks

a)

Two

b)

  • Three

c)

Four

d)

Five

e)

Six

13.

Metering orifice opens in proportion to the amount of flow commanded by the ______.

a)

DCV

b)

Metering Valve

c)

Hydrostatic Transmission

d)

Operator

e)

Pilot Valve

14.

The ______ is Responsible for restricting overrunning loads 

a)

Summation Node

b)

Flow Control Valve

c)

Metering Orifice

d)

Metering Valve

e)

Oil Return Passageway 

15.

_______ node delivers oil to metering orifices of third priority DCVs

a)

Bypass

b)

Second Priority

c)

Third priority

d)

Return

e)

Pimple

16.

Three of the four passageways in a Husco flow-summation DCV are ______ passageways used in a traditional open-center DCV

a)

The Same

b)

Parallel

c)

Lateral

d)

Vertical

e)

Metered Orifice

17.

_________ do not remain in calibration and lose accuracy after repeated use.

a)

Variable Orifice Valves

b)

DCVs

c)

Pilot Valves

d)

Pressure Gauges

e)

Flowmeters

18.

·       Some manufacturers require technician to plot _______ for hydraulic pump diagnosis

a)

Pilot Assist Pressure

b)

PQ curve

c)

Torque Vectors

d)

Horsepower Curve

e)

Flow Path Circuits

19.

_________ can be designed for low-pressure applications, so be sure that the fitting is made of steel prior to installing it in a high-pressure system.

a)

Pressure Taps

b)

Flow Meters

c)

Metering Valves

d)

Accessory On/Off Valves

e)

Quick Release Valves

20.

Just as grounds can be the source of problems in electrical circuits, ______ can cause problems in hydraulic circuits

a)

Relief Valves

b)

Return Circuits

c)

Flow Rails

d)

Fixed Orifices

e)

Variable orifices

21.

______ can affect temperature of hydraulic systems

a)

Humidity

b)

Altitude

c)

Ambient wind speed

d)

Slope / Grade

e)

Paint

22.

Cycle Times Should be tested during ______ preventative maintenance inspection

a)

Daily

b)

24-hour

c)

500-hour

d)

Semi-Annual

e)

Annual

23.

Most common type of mechanical gauge used:

a)

Sealed tube

b)

Pressure flex

c)

Spiral Tube

d)

Helical Tube

e)

Bourdon Tube

24.

Eliminate pulsations that result from hydraulic system flows and pressures:

a)

Single acting cylinders

b)

Flow Control Valves

c)

Snubbers 

d)

Accumulators

e)

Flywheels

25.

Acts like automatic clutch :

a)

Flywheel

b)

Torque Converter

c)

Hydrostatic Transmission

d)

Pilot Operated DCV

e)

Reversable Variable Piston pump

26.

Most HSTs use variable-displacement ______ engine-driven pump(s). 

a)

Linear

b)

Stacked

c)

Series

d)

Parallel

e)

Reversible

27.

Route motor’s return oil directly back to reservoir :

a)

Open-Loop HSTs 

b)

Closed -Loop HSTs

c)

Pilot Operated DCVs

d)

Flow Control Valves

e)

Pressure Regulated HSTs

28.

Steerable axle with geometry that enables inside wheel to turn at greater steering angle than outside wheel:

a)

Ackerman Steering

b)

Geared Steering

c)

Rack and Pinion

d)

Articulating Steering

e)

Sector Steering

29.

_________ connects front frame of machine to rear frame

a)

Swivel Point

b)

Fulcrum

c)

Articulation joint

d)

Clevis

e)

Kingpin

30.

What is this?

a)

Hedgerow

b)

Cornrow

c)

Wheatrow

d)

Windrow

e)

Peatrow

31.

Caterpillar calls their SCU:

a)

SCV

b)

HMU

c)

Hydrostatic Steering

d)

Pivot Steering

e)

Orbital Steering

32.

Protects steering cylinder(s) and hoses from over pressurization:

a)

Return Rail

b)

Control Valve Relief Port

c)

Secondary Relief Valve

d)

Cylinder Port Relief Valve

e)

Reservoir Return Valve

33.

Anti-Cavitation Check Valves AKA:

a)

Poppet Valves

b)

Make-Up Valves

c)

Kick-Down Valves

d)

Shore Valves

e)

Anti-Seize Valves

34.

Allows external loads placed on steering cylinder(s) to actuate steering system:

a)

Single-acting SCU

b)

Multi-Port SCU

c)

Load-Sensing SCU

d)

Wide-Angle SCU

e)

Load-Reaction SCU

35.

An advantage of a Q-Amp SCU:

a)

Uses much less hydraulic fluid flow needed compared to conventional SCUs

b)

Provides more fluid pressure to hold turns at higher speeds

c)

When vehicle is traveling at high speeds, SCU will not be overly reactive

d)

They do not divert fluid from other working accessories

e)

They lock steering when PTO is engaged for added safety.

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