Engineering Materials LC1 Question Bank - Quia · Web viewThe valve that controls the speed of the...

Basic Pneumatics – LC4 Question Bank & AKG11-OL

Part A Choose the correct answer 30 - Marks

Q1: Match the names of the following Pneumatic components with respective pictures: (10- Marks) Question 1 2 3 4 5 6 7 8 9 10Answer

No Pneumatic component Letter Name

1. AOne way flow control valve

2. B

3/2 way DCV roller- lever actuated

3. C Quick exhaust valve

IAT-DXB/ Basic Pneumatics/ LC4 Exam/ Samir Hamasha - 1 -

4. D 3/2 way DCV Pushbutton actuated

5.

E Time Delay Valve

6.

F Double Piloted controlled– pneumatically actuated DCV


7. G Service Unit

8.

H Double acting Cylinder

9. I silencer

10. J Dual valve –Logic AND Function

Question 1 2 3 4 5 6 7 8 9 10Answer C A B F D E H G J I

Answer: (10 – Marks)


Q2: Match the Pneumatic components in column A with the correct symbol in column B. Write your answer in the answer box provided Column A 1 2 3 4 5 6 7 8 9 10 11 12Column B

Column (A) Column ( B )

1- Double acting cylinder

a-

2- 3/2 way DCV, roller lever type , N/C , spring return

b-


3- Time delay valve

c-

4- Pressure sequence valve

d-

5- Service Unit

e-

6- Dual Valve ( AND Gate)

f-

7- Pressure source

g-

8- 5/2 way DCV, single piloted

h-

9- 3/2 way DCV, normally closed

i-


10- 5/2 way memory valve (double piloted)

j-

11- Air filter

k-

12- Dual valve ( AND gate)

L-

Q3: Choose the most correct answer and put a circle around the corresponding letter a, b, c, or d.Question 1 2 3 4 5 6 7 8 9 10 11 12 13Answer

1- The valve shown in the picture aside is:

a) Time delay valveb) Pressure regulatorc) Pressure sequence valve d) Flow control Valve

2- The valve shown in the picture aside is:

a) Time delay valvea) Pressure regulatorb) Pressure sequence valve


c) Flow control Valve

3- To actuate a double acting cylinder in a forwards and backwards directions, the final control element used ( Valve ) is:a) 2/2 way valveb) 3/2 way valvec) 5/2 way valved) 4/2 way valve

4- If it is necessary to lubricate air before it enters pneumatic components, which of the valve combination must you install?

5- You have removed the valve shown from a control and want to replace it, what type of valve is it?

a) 3/2 way valve , pneumatically operated on both sides

b) 4/2 way valve, pneumatically actuated, spring return.

c) 5/2 way valve, pneumatically actuated on both sides

d) 4/2 way valve, solenoid valve

6- In a pneumatic control, the piston of a cylinder is only to extend after a delay of 10 seconds after signal input.Which of the valve combination shown must you install?


7- pneumatic system is used in many areas of engineering and for manyapplications such as:

a)Robotsb)Hydraulic Jackc)Power packd)Cranes

8- Advance stroke in single acting cylinders is provided by -----------a) Air pressure.b) Spring.c) External force.d) All of the above

9- Pneumatics is the use of (…………………) to do work

a) Oil b) Air c) Electricity d) Moisture

10- One of the advantages of Pneumatics is a) It is expensive b) It results in pollution c) It provides self lubricationd) It has a clean working environment

11- The valve that controls the speed of the stroke of the cylinder is:

a) directional control valveb) Flow control valve c) pressure control valved) Non return valve

12- Time delay valve function is : a) To speed up the cylinder stroke b) To delay the signal given to the cylinder.c) To regulate the pressure of the circuitd) To increase the flow rate of air.

13- Pressure sequence valve function is a) To adjust the pressure of the circuit to a certain limit.b) To increase the speed of the advance stroke c) To decrease the speed of the return stroke


d) To regulate the flow rate of air.


Question 1 2 3 4 5 6 7 8 9 10 11 12 13Answer c a c d c e a a b d b b a

Part B Fill in the blanks 10- Marks

Fill-in-the blanks in the following statements with the most suitable word from the list below:

a) Moisture b)5/2 way

DCV, double piloted

c)Non-

Return valve

with pilotd) Pressure

regulator e) Speed

F) "AND" gate valve g) "OR" gate

valve h) stroke i)Pressure sequence

valve.j) Service

unit

Question 1 2 3 4 5 6 7 8 9 10Answer

1- …………..…allows the air flow in two directions.2- A………………....is used to control the direction of motion of a double acting

cylinder.3- ……………………….are commonly known as dual valve.4- …………………….. is used to control the pressure of the pneumatic circuit in

order to control the sequence of the cylinder stroke.5- The flow control valve is used mainly to regulate the ………….…of pneumatic

cylinders. 6- If….…………..….is allowed to enter the pneumatic circuit, corrosion will occur

in pipes, cylinders and other components.


7- ............…...is used to clean, dry, lubricate and regulate the air pressure.8- The time delay valve is used to control the speed of the piston ……..……9- ……………… are used to adjust the pressure of the working equipment.10- …………………….. are commonly known as Shuttle valves.


Question 1 2 3 4 5 6 7 8 9 10Answer c b f i e a J h d g

Part C True and False Questions 10- Marks

Write (T) for true and (F) for false for the following:

Question 1 2 3 4 5 6 7 8 9 10Answer

1- The silencer is designed to produce a reduction in exhaust speed and to reduce noise. (…….……...)

2- Air Lubricator is used to supply the pneumatic system with lubrication oil (…………..)

3- The service unit should be located directly before any hydraulic systems (…….…….)

4- Double-Acting Cylinders has two ports. Air is applied in both directions (…………..)

5- Single acting cylinder has one port. (…………..)

6- Air filter is used to clean the air. (…………..)

7- 5/2 way valve is used to operate a single acting cylinder. (…………..)

8- Air compressor is used to lubricate the air. (…………..)

9- The type of motion in double acting cylinder is rotary. (…………..)

10- In pneumatics, exhaust air return back to the tank (…………..)



Question 1 2 3 4 5 6 7 8 9 10Answer T T F T T T F F F F

Part D Descriptive QUESTIONS ……- Marks

Q1: Referring to the circuit diagram shown below, answer the following questions.

a.Name the type of valve labeled with A…………………………………………………

b.Name the type of valve labeled with B …………………………………………………

c.Name the type of valve labeled with C………………………………………………

What is the function of the pressure regulator valve?

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

Explain, what will happen if you press the push button of the 3/2 way DCV on the left?


……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

Explain, what will happen if you press the push button of the 3/2 way DCV on the right? ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

Answer : (2 marks each = 10 Marks) a. Name the type of valve labeled with A

The valve is 3/2 way directional control valve, push button, N/C, spring return.

b. Name the type of valve labeled with B

The valve is 5/2 way directional control valve, double piloted.

c. Name the type of valve labeled with C

The valve is pressure regulator.

d. Explain, what will happen if you press the push button of the 3/2

way DCV on the left?

When the valve A is actuated, the air will flow to valve B and switch it from the position 1→ 4 to the position 2→3 , so the piston in the double acting cylinder will move forward.


e. Explain, what will happen if you press the push button of the 3/2 way DCV on the right?

When the valve on the right is actuated, the air will flow to valve B and switch it from the position 1→ 2 to the position 4→5, so the piston in the double acting cylinder will move backward.

Q2: Referring to what you had practiced in the workshop, A) Connect the pneumatic components to build a working pneumatic

circuit (10- Marks)


What is the name of valve A?…………………………………………………………………………………………

What is the function of valve A? ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

Answer Q4: Referring to what you had practiced in the workshop,

A) Connect the pneumatic components to build a working pneumatic circuit (1 – Mark / connection = 8 Marks)


B) What is the name of valve A?Time delay Valve (1- Mark)

C) What is the function of valve A?

I is used to delay the signal delivered to the left pilot of the 5/2 way DCV in order to delay the return stroke of the double acting cylinder (1- Mark)

Q3: Given the following components, build a pneumatic circuit to control the cylinder stroke by using 3/2 way valve roller lever actuated.

…


Explain what will happen in the following cases: 1- Pressing the left side 3/2 way DCV push button. ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………2- Pressing the right side 3/2 way DCV push button………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

Q5/ Answer:(1 Mark/ connection = 10 marks)

Explain what will happen in the following cases: 1- Pressing the left side 3/2 way DCV push button.


A signal will be received by the left pilot of the 5/2 way DCV to change its position in a way that cause the piston to move in a forward stroke , the piston will automatically actuate S1 so the piston will move in the backward stroke.

2- Pressing the right side 3/2 way DCV push button

A signal will be received by the right pilot of the 5/2 way DCV to change its position is a way that will results in a return stroke for the piston.

Q4: Given the following components, build a pneumatic circuit to control the two cylinders (10-Marks)


Q4/Answer ( 1-Mark for each correct connection)= 10 Marks


Q5: Name the following Pneumatic components

A)…………………………………………………………

What are the internal parts in this component?i-………………………………………….ii-…………………………………………iii-………………………………………..

What is the function of this component?


………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

B)…………………………………………………………

What are the internal parts in this component?i-………………………………………….ii-…………………………………………

What is the function of this component?………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………Q5/ Answer: ( 10 - Marks) Name the following Pneumatic components

A)Time delay valve ( 1- Mark)

What are the internal parts in this component? ( 3- Marks)i- One way flow control valveii- Accumulatoriii- 3/2 way DCV single piloted

What is the function of this component? (1 1/2 -Marks)

It is used to delay the signal delivered to the double acting cylinder which results in delay of the stroke(increasing the time to receive the signal).

B)Pressure sequence valve ( 1- Mark)

What are the internal parts in this component? ( 2- Marks)


i-3/2 way DCV single pilotedii-Pressure regulator

What is the function of this component? ( 1 1/2 – Marks)

It is used to regulate the pressure of the pneumatic circuit in order to control the stroke of the cylinder increasing or decreasing the pressure results in control of the sequence of occurrence of the cylinder strokes.


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