Free Printable Introduction to Vacuum Technology

1.

Absolute Pressure =

a)

Guage Pressure + Vaccum Pressure

b)

Atmospheric Pressure + Guage Pressure

c)

Vaccum Pressure + Absolute Pressure

d)

Vacuum Pressure - Atmospheric Pressure

2.

Specific Volume =

a)

$\frac{Specific\ wt.\ of\ liquid}{specific\ wt.\ of\ fluid}$

b)

$\frac{volume\ of\ fluid}{mass\ of\ fluid}$

c)

$\frac{mass\ of\ fluid}{weight\ of\ fluid}$

d)

$\frac{weight\ of\ fluid}{weight\ of\ liquid}$

3.

Mass density

a)

$\frac{volume\ of\ fluid}{mass\ of\ fluid}$

b)

$\frac{mass\ of\ fluid}{volume\ of\ fluid}$

c)

$\frac{weight\ of\ fluid}{volume\ of\ fluid}$

d)

$\frac{weight\ of\ liquid}{weight\ of\ fluid}$

4.

Ultra-high vacuum can be achieved by using _____________

a)

Rotary pump

b)

Roots Pump

c)

Diffusion pump

d)

Turbomolecular pump

5.

Vacuum pressures can be expressed in ___.

a)

Psia/kPa absolute

b)

BTUs

c)

Ounces/Ft

d)

RPM

6.

In pneumatics any pressure below atmospheric is called a ___.

a)

Vacuum

b)

Partial Vacuum

c)

Vacuum Pressure

d)

All of the answers are correct

7.

For laminar flow, pressure drops in the throat of the Venturi in accordance with ___.

a)

Pascal's Law

b)

Torricelli's Scale

c)

Law of Averages

d)

Bernoulli's Law

8.

The vacuum gauge used as a standard gauge and used to calibrate other gauges is

a)

Bourdon Gauge

b)

Pirani Gauge

c)

McLeod Gauge

d)

Penning Gauge

9.

Vacuums are measured with a ___.

a)

Vacuum Transducer

b)

Venturi

c)

Manometer

d)

Vacuum Cup

10.

Industry uses vacuums to ___.

a)

Lift heavy loads

b)

Form thin materials

c)

Stamp sheet metal

d)

Drill thin materials

11.

Select all that are used in vacuum filtration:

a)

vacuum flask

b)

round-bottom flask

c)

volumetric flask

d)

filter paper

e)

funnel

12.

Vacuum filtration is carried out under ______ pressure than atmospheric pressure.

a)

lower

b)

higher

c)

constant

d)

zero

13.

In the food packaging industry, vacuum sealers are used for?

a)

Improve shelf life of perishables.

b)

Reduce food waste

c)

Increase number of cooking methods

d)

All of the above

14.

In McLeod gauge,

a)

High pressure fluid is expanded to a low pressure which is read by the monometer technique

b)

Low pressure fluid is compressed to a high pressure which is read by the bourdon technique

c)

High pressure fluid is expanded to a low pressure which is read by the bourdon technique

d)

Low pressure fluid is compressed to a high pressure which is read by the monometer technique

15.

Which of the following transducers can be used for measurement of pressures as high as 100,000 atmosphere.

a)

Mcleod gauge.

b)

Pirani gauge.

c)

Bridgman gauge.

d)

Knudsen gauge.

16.

The operation of Pirani gauge depends upon the

a)

variation of the thermal conductivity of a gas with the change in pressure.

b)

variation of the electrical conductivity of a gas with the change in pressure.

c)

variation in humidity of the medium with the change in pressure.

d)

none of the above.

17.

Pick the odd one out

a)

Pirani gauge.

b)

Thermocouple gauge.

c)

Meleod gauge.

d)

Resistance-wire strain gauge.

18.

Which of the following is not a type of pressure sensing element?

a)

Bellows

b)

Bourdon tube

c)

Diaphragm

d)

Orifice plate

19.

Which of the following conversion take place in bourdon tubes?

a)

Pressure to displacement

b)

Pressure to voltage

c)

Pressure to strain

d)

Pressure to strain

20.

WORKING PRINCIPLE OF MCLEOD GAGUE IS BASED ON (a) LAW

21.

The pressure which is exerted by air around us is known as

a)

force

b)

atmospheric pressure

c)

muscular force

d)

friction

22.

The force exerted by the earth to pull the object towards itself is called

a)

electrostatic force

b)

gravitational force

c)

muscular force

d)

contact force

23.

Cryo-pumps works on the principle of

a)

Positive displacement

b)

Ejector

c)

Gas condensation at low temperature

d)

Kinetic pump

24.

The amount of force pushing on an area is the definition of....

a)

Fluid

b)

Viscosity

c)

Barometer

d)

Pressure

25.

What is the unit of measurement for pressure?

a)

pascal

b)

grams

c)

milliters

d)

meters

26.

When you increase your depth under water, the water pressure on your body

a)

increases

b)

decreases

c)

stays the same

d)

zero

27.

How do you Calculate Pressure

a)

Force(N)/Area(m²)

b)

Force(kg)/Area(mi²)

c)

Area(m²)/Force(N)

d)

None of the above

28.

Where would you find the largest pressure?

a)

At the bottom of the ocean

b)

At the top of Mt Everest

c)

Close to sea

d)

inside the well

29.

This is an example of the everyday application of pressure in:

a)

Solids

b)

Liquids

c)

Gases

d)

Plasma

30.

The pressure inside the syringe will decrease if we move the plunger in:

a)

Direction A

b)

Direction B

c)

We don't have to move the plunger as the pressure will change on its own.

d)

None of the above answers.

31.

The reason gases can be compressed is because:

a)

The particles are very close together.

b)

The particles are merely vibrating.

c)

The particles are unable to move.

d)

The particles are very far apart.

32.

What is the instrument that measures air pressure called?

a)

Graduated cylinder

b)

Barometer

c)

Force scale

d)

Anemometer

33.

1 pascal of pressure is equal to

a)

1 N/mm²

b)

1 N/m²

c)

1 KN/m²

d)

1MN/m²

34.

Absolute pressure is equal to

a)

Gauge pressure +Vacuum pressure

b)

Atmospheric pressure x Gauge pressure

c)

Atmospheric pressure + Gauge pressure

d)

Atmospheric pressure - Gauge pressure

35.

Differential manometers are used to measure

a)

Pressure in water channels, pipes etc

b)

Difference in pressure between two points

c)

Atmospheric pressure

d)

Very low pressure

36.

The pressure less than atmospheric pressure is known as

a)

Suction pressure

b)

Vaccum pressure

c)

Negative gauge pressure

d)

All of these

37.

Mercury has

a)

Low vapour pressure

b)

High vapour pressure

c)

Zero vapour pressure

d)

Infinite vapour pressure

38.

Which pump usually contains a material such as activated charcoal?

a)

Turbomolecular Pumps with Turbines

b)

Cryopumps with sorbents

c)

Rotary Pumps with Vanes

d)

Ion Pumps with Cathodes

39.

Which pump involves an anode and a cathode?

a)

Turbomolecular Pump

b)

Rotary Pump

c)

All vacuum pumps

d)

Ion Pump

40.

What type of pump uses the fluctuation of the area/volume to create a vacuum?

a)

Ion Pump

b)

Turbomolecular Pump

c)

Cryopump

d)

Rotary Pump

Introduction to Vacuum Technology

Total questions: 40

Worksheet time: 20mins

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