HYDRAULIC AND PNEUMATIC CIRCUIT

Fluid power circuits use schematic drawings to

• Make it so only trained persons can understand the functions

• Simplify component function details

• Make untrained person to understand

• Make the drawing look impressive

Most hydraulic circuits

• Have a dedicated power unit

• Use air-over-oil power units

• Operate from a central hydraulic power unit

• Does not have dedicated power unit

Hydraulic and pneumatic circuits

• Perform the same with some exceptions

• Perform differently for all functions

• Perform the same way for all functions

• Does not perform all the functions

The lubricator in a pneumatic circuit is the

• First element in line

• Second element in line

• Third element in line

• Last element in line

Series circuits work on both hydraulic and pneumatic actuators.

• True

• False

Which of the following statements is true?

• Tank line feed control systems have speed control only in one direction

• Standard block feed circuits have speed control in two directions

• Meter-in feed circuits have speed control in two directions

• all of the above

What is a pressure sequence valve?

• It is a combination of nonadjustable pressure relief valve and directional control valve

• It is a combination of adjustable pressure relief valve and directional control valve

• It is a combination of adjustable pressure reducing valve and check valve

• It is a combination of adjustable pressure reducing valve and flow control valve

What is the notation used for the sequence of operations mentioned below?

1. Cylinder A undergoes forward stroke

2. Cylinder B undergoes forward stroke

3. Cylinder A undergoes backward stroke

4. Cylinder B undergoes backward stroke

• A⁺ B^- A^- B⁺

• A⁺ B⁺ A^– B^–

• A^– B^– A⁺ B⁺

• A⁺ A^– B⁺B^–

Which of the following statements is true for cascade method which is used to draw a pneumatic circuit?

• signal processing valves are connected in parallel

• When the number of signal processing valves are greater than 4, the signals are strong

• Cascade method does not consider the cost factor

• all of the above

In a regenerative circuit, the speed of extension is greater than that for a regular double-acting cylinder

because the flow from the ______ regenerates with the pump.