1. Components in a fixed-volume pump circuit are protected from excess pressure by a : . .
- relief valve.
- counterbalance valve.
- reducing valve.
2. Direct acting relief valves have ___________ response time than a pilot-operated relief valve.
- slower
- the same
- faster
3. Pilot-operated relief valves have ___________ pressure override as a direct-acting relief valve.
- more
- less
- the same
4. Solenoid-operated relief valves can be made from:
- direct acting relief valves.
- pilot operated relief valves.
- either type relief valve.
5. A vent port is found on:
- pilot-operated relief valves.
- direct-acting relief valves.
- either type relief valve.
6. Solenoidoperated relief valves can be used:
- on the case drain of a pump.
- on the tank line of a pump.
- to unload the pressure port of a pump.
7. Unloading valves are commonly found in:
- pressure-compensated pump circuits.
- hydraulic motor circuits.
- hi-lo pump circuits.
8. An unloading valve is set for higher pressure than the relief valve in a hi-lo pump circuit.
- True
- False
9. Unloading valves are different from relief valves because they:
- are externally piloted.
- do not control pressure.
- Are normally open.
10. Using a hi-lo pump circuit:
- requires less horsepower.
- requires more horsepower.
- requires about the same horsepower.