Exercise 1

Question 36 :

In the United States the television broadcast standard is...?


A). PAL
B). NTSC
C). SECAM
D). RGB
Answer : Option B

Explanation :

PAL and SECAM are standards used in other countries. RGB stands for red, green, and blue - the colors of light used to create an image in a color tv set and is often used as a format name for computer monitors.


Question 37 :

In a color television set using a picture tube a high voltage is used to accelerate electron beams to light the screen. That voltage is about...?


A). 500 volts
B). 5 thousand volts
C). 25 thousand volts
D). 100 thousand volts
Answer : Option C

Explanation :

This voltage often remains in storage even if the set is unplugged. Although the voltage is very high it has very low power but it can be dangerous because your body jumps if brought in contact.


Question 38 :

The transformer that develops the high voltage in a home television is commonly called a...?


A). Tesla coil
B). Flyback
C). Yoke
D). Van de Graaf
Answer : Option B

Explanation :

The flyback is usually connected to the system that pulls the electron beam across the screen in one direction to 'paint' a line of the image and then returns in the other direction much faster.


Question 39 :

Which consists of two plates separated by a dielectric and can store a charge?


A). Inductor
B). Capacitor
C). Transistor
D). Relay
Answer : Option B

Explanation :

Useful in tuning and filtering circuits, it blocks DC while passing AC. How much charge a capacitor can store is its capacitance, measured in farads.nn


Question 40 :

What do we call a collection of two or more computers that are located within a limited distance of each other and that are connected to each other directly or indirectly?


A). Inernet
B). Interanet
C). Local Area Network
D). Wide Area Network
Answer : Option C