Hydraulics and Pneumatics Flashcards
(29 cards)
As compared to a hydraulic cylinder of the same strength, pneumatic actuators are:
A. Faster
B. Larger
C. Longer
D. More accurate
A. Faster
As a gas is compressed, the pressure does what?
A. Pressure goes up and volume goes down
B. Pressure goes up and volume goes up
C. Pressure goes down and volume goes up
D. Pressure goes down and volume goes down
A. Pressure goes up and volume goes down
What would cause pneumatic actuators to get progressively slower?
A. Rod seals binding
B. Insufficient airflow
C. Failed solenoid
D. No solenoid voltage
B. Insufficient airflow
Solenoids on directional valves are typically actuated by what?
A) PLC input
B) PLC output
C) Analog signal from a sensor
D) Manual pushbutton control
B) PLC output
What is the best way to change the speed of a pneumatic cylinder?
A. Increase voltage
B. Reduce hose size
C. Adjust flow control valve
D. Increase fitting sizes
C. Adjust flow control valve
What is a sign of cavitation?
A. Low fluid
B. Milky flow
C. Recirculation
D. No fluid
B. Milky flow
An increase of pressure in a Hydraulic Cylinder will enable you to:
A.) Have no effect
B.) Increase the Force from the Cylinder
C.) Increase the speed at which the Cylinder Rod extends
D.) None of Above
B.) Increase the Force from the Cylinder
Technician A states that a “cushioned” hydraulic cylinder is used to keep the hydraulic cylinder quiet and ergonomically acceptable. Technician B states that a “cushioned” cylinder must be used when there is a possibility of damage from the impact at the end of the piston stroke because of high speeds and heavy loads. Which Technician is correct?
A.) A only
B.) B only
C.) Both A and B
D.) Neither A or B
B.) B only
A valve that regulates the rate of fluid flow in a specific part of a circuit is known as what type of valve?
A.) Counterbalance Valve
B.) Pilot Valve
C.) Flow Control Valve
D.) Pressure Control Valve
C.) Flow Control Valve
In a pressure relief valve, what term is used to describe the pressure at which the valve becomes fully open?
A.) Cracking Pressure
B.) Valve Setting
C.) Full Actuating Pressure
D.) Pressure Range
A.) Cracking Pressure
A valve that is made to lift or tilt a load, then block return flow to support the load is known as what type of valve?
A.) Counterbalance Valve
B.) Pilot Valve
C.) Flow Control Valve
D.) Pressure Control Valve
A.) Counterbalance Valve
A valve that is a device used to define the flow of fluid is known as what type of valve?
A.) Counterbalance Valve
B.) Pilot Valve
C.) Flow Control Valve
D.) Pressure Control Valve
B.) Pilot Valve
What causes pressure in a functioning Hydraulic System?
A.) Resistance to flow
B.) Pressure Relief Valve
C.) Pressure Compensating Valve
D.) Load Drop Check Valve
A.) Resistance to flow
Under certain conditions, gas or air bubbles are created in fluids. When this occurs in hydraulic pumps, what is it known as?
A.) Volumetric Inefficiency
B.) Intermittent Pressure Dispersement
C.) Reverse Flow Agitation
D.) Cavitation
D.) Cavitation
In a hydraulic system, what is the purpose of the hydraulic pump?
A.) To pump pressure
B.) To cause fluid to flow
C.) To regulate the flow of fluid
D.) To agitate fluid
B.) To cause fluid to flow
In a hydraulic system that uses a vented hydraulic reservoir, what causes fluid to flow from the reservoir to the pump?
A.) Atmospheric Pressure
B.) The Pressure Compensating Valve
C.) The height of the Pump in relation to the hydraulic reservoir
D.) All of the above
A.) Atmospheric Pressure
What is the difference between a hydraulic cylinder and a hydraulic ram?
A.) A ram is meant to be used for higher forces
B.) A cylinder is longer
C.) The rod of a ram has a cross-sectional area greater than half that of the piston face
D.) The rod of a cylinder usually will retract at a faster rate
C.) The rod of a ram has a cross-sectional area greater than half that of the piston face
The purpose of the pressure relief valve is to do which one of the following?
A.) Limit fluid flow to the actuators
B.) Limit maximum pressure in the system
C.) Relieve fluid pressure in a cylinder
D.) Maintain a specific pressure in the system
B.) Limit maximum pressure in the system
Which one of the following items have nothing to do with Hydraulics?
A.) M.P.H.
B.) P.S.I.
C.) G.P.M.
D.) R.P.M.
A.) M.P.H.
Viscosity of an oil refers to the tendency of the oil to resist:
A.) Acid accumulation
B.) Flowing
C.) Carbonizing
D.) Oxidation
B.) Flowing
Ball valves are commonly used to:
A. Throttle flow
B. Check flow
C. Change flow direction
D. Start/stop flow
D. Start/stop flow
Flow can be described in units of all of the following EXCEPT:
A) Volume
B) Density
C) Mass
D) Velocity
B.) Density
All of the following valves are used to regulate flow EXCEPT:
A) Ball
B) Butterfly
C) Needle
D) Gate
D) Gate
The value of the dynamic variable desired in a process is the:
A) Signal
B) Set point
C) Resolution
D) Specific gravity
B) Set point
