Another quiz p7 111 :(((((

Question 1

Why do we use tungsten? 3 yan

Answer 1

1. Atomic number
2. Thermal conductivity
3. High melting point (3410 C)

Question 2

The addition of ? to ? —- to the tungsten filament enhances the

Answer 2

1-2% thorium

enhances the efficiency of thermionic emission and prolongs tube life

Question 3

What is the focusing cup made of?

Answer 3

Nickel

Question 4

Effectiveness of focusing cup is determined by the ?? and ??, and ??

Answer 4

Size and shape, and position of the filament

Question 5

The focusing cup is ??? charged

Answer 5

negatively

Question 6

Protective housing reduces the intensity of leakage radiation to less than?

Answer 6

1 mGy a/h

Question 7

Dual filament cathode designed to provide focal spots of —- and mm

Answer 7

0.5 mm and 1.5mm

Question 8

Measurements of filament?

mm in diameter
length

Answer 8

The filament is 2mm in diameter and 1-2cm long

Question 9

What is the main purpose of our cathodes, 3 to

Answer 9

Production of electron cloud, Accelerate the electrons towards the cathode, focuses the electron stream

Question 10

The cathode has two components?

Answer 10

Filament and focusing cup

Question 11

Filament measurements
Thick
Long
diameter

Answer 11

0.1-0.2 mm thick
1-2 cm long
2 mm diameter

Question 12

The filament is a?

Answer 12

small coil of thin thoriated tungsten wires

Question 13

When the current through the filament is sufficiently high, the outer shell electrons of the filament atoms are “boiled off” and ejected from the filament

Answer 13

Thermionic emission

Question 14

2 types of anode

Answer 14

Stationary and Rotary

Question 15

Premium alloy tungsten embedded in a —- degree angle in the end of —- —-

Answer 15

45 degree angle, end of copper rod

Question 16

what is the tungsten usually made with?

Answer 16

Rhenium tungsten alloy

Question 17

The target of a rotating anode tube is powered by an ???

Answer 17

induction motor

Question 18

why is molybdenum/ graphite used in the rotating tube

Answer 18

because it is lighter, less density making the anode lighter and easy to rotate

Question 19

Area of the anode struck by the electrons from the cathode

Answer 19

Target

Question 20

Entire rotating disk length

Answer 20

5-13 cm

Question 21

Induction motor has 2 parts

Answer 21

Stator and rotor

Question 22

Difference between the stator and the rotor

Answer 22

The stator is the part outside made out of electromagnets that equally space around the length of the tube

The rotor is the part inside it is made out of copper and soft iron

Question 23

the rotor is made out of

Answer 23

copper and soft iron