laboratory tech. practical work book

7/30/2019 Laboratory tech. Practical Work Book

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PRACTICAL WORK BOOK

ON

VACUUM TECHNIQUES

Name:.

Matric No:

PRACTICAL Work One

Date:

.

PROCEDURES:

VISIT A VULCANIZER, STUDY THE WORK HE IS DOING

QUESTIONS:

1. How does he detect leak?

Explain the various step

2. In a tabular form, compare the valcanizers

method of leak detection to leak detection by high

frequency tester.

Explain the various steps in detail.

3. As he pumps the tube, explain what

happens to size of the tube.

4. What do you think will happen to the air

(gas) molecules and the internal surface of the tube?

Explain.


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5. In your own metal view, alpha picture how

you think the gas or air molecules would appear if they

are exhibiting gas to gas collision.

Draw the diagram and explain them.

5b. In your own thinking try to create a picture showing

wall/gas collision.

Explain the structure in your diagram.

6. What do you think would happen if the host

used in pumping the tube was leaking while the

pumping is on?

7. Consider the case where the host is not

leaking. Explain what happen inside the tube as the

pumping continues.

In any case invoke the Boyles law.

8. As scientist, give you professional advice

on how to maintain a Rotary or diffusion pump.

PRACTICAL WORK TWO

Date:.

1. Make a Label diagram of a common gauge

2. If a gauge falls heavily on a solid surface, what do you

think will happen to .

(a) The transparent glass on it.

(b) If a plastic transparent material is made of it.

(c) The air spring.


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3. Suppose a metallic casing is made of s particular

common gauge and it is to be burial alongside with a

plastic cased and a stainless cased gauge.

Explain what happen to the casings of the three

difference gauge if hey were to be burial for a period

of six months before digging them out.

4. Will the gauge work effectively, why?

Explain.

5. From your study care and handling of common gauges

what will happen to the pointer?

6. What do you think will b found on the graduated scale

of the gauge?

PRACTICAL WORK THREE

Date

1. Make a label diagram of an oil- sealed rotary pump.

2a. Suppose you were to pump the following

a) clean water

b) kerosene

c) petrol

d) muddy water with sand particles

Which of the above would be easily pumped and why?

Explain in details.

2b. Which of them would leak faster and why?

Explain.

2c. Which of them would diffuse faster and why

Explain.

2d. Which of them cause impedance, why do you think so?


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Explain in details.

PRACTICAL WORK FOUR

Date:

1. Make a label diagram U-tube manometers (open and

closed).

2. Water or steam pressures in boilers are extremely high,

can hey be measure by open or closed- tube

manometer, why?

Explain.

3. If palm oil is used in the open-tube manometer and

connected to a boiler to measure its pressure, what do

you think will happen?

Explain.

laboratory tech. practical work book

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