Haydraulic & Deck Machinary (Set 4)

1. Return lines in a non-pressurized hydraulic system reservoir should enter the tank well below the fluid surface level to ___________.

prevent foaming

prevent moisture accumulation

prevent vacuum formation

accommodate thermal expansion

2. An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of ___________.

aeration of the oil

contamination of the oil

pump cavitation

spongy actuator movements

3. Overheating of a hydraulic system may be a result of ___________.

changing pump discharge pressure in response to normal load variations

a high oil level

incorrect fluid viscosity

continued slow recirculation of the oil

4. A reservoir is used in a hydraulic system to ___________.

store fluid until required by the system

provide a place for air to separate out of the fluid

provide a place for contaminants to settle out

all of the above

5. An orifice-check valve placed in a hydraulic system is used to ___________.

regulate the fluid flow in either direction

restrict movement of hydraulic fluid in one direction, but allow free movement in the other direction

allow free movement of hydraulic fluid in both directions

allow a restricted fluid flow in one direction only

6. Hydraulic system reservoirs should be maintained at recommended normal levels to reduce ___________.

condensation on inside walls

heat retention of working fluid

frequency of fluid changeover

all of the above

7. In a typical hydraulic system, a baffle is installed in thereservoir to ___________.
I. insure proper lubrication of the hydraulic pump
II. assist in the removal of Solid contaminants entrained in the returning oil

I only

II only

Both I and II

Neither I and II

8. In a typical hydraulic system, a baffle is installed in thereservoir to ___________.
I. provide a critical reduction in free surface effect hydraulic pump
II. assist in retaining the hydraulic oil to provide heat removal

I only

II only

Both I and II

Neither I and II

9. As a general rule of thumb, the reservoir used in a hydraulic system should have a capacity, when at the normal level, approximately equal to ___________.

two to three times the normal flow rate through the system

the flow rate through the system

ten times the flow rate through the system

the pump gpm

10. Which of the following problems occurring in a hydraulic system can be caused by the use of an oil having a viscosity lower than specified?

Seal deterioration

Fast response and hunting

Increased power consumption

Oil film breakdown

Haydraulic & Deck Machinary (Set 4)

Multiple Choice Questions