mechanic auto electrical and electronics

To make a N-type semiconductor,which of the following impurities are to be added to semiconductor...

• phosphorous

• boron

• aluminum

• gallium

To make P-type semiconductor,which of the following impurities are to be added to semiconductor...

• Phosphorous

• boron

• arsenic

• antimony

True or False question,

when doping has completed, intrinsic semiconductor turns into extrensic semiconductor.

• true

• false

Never work on an electrical circuit until you have turned off the circuit breaker.  

• True
• False

It is alright to touch bare wires without testing it first with a voltage tester.  

• True
• False

Cords and power tools should always be inspected for visual defects before using.  

• True
• False

Do not use adapters which convert three-prong power tools to two-prong.  

• True
• False

It is important to report accidents to your instructor, no matter how small they may seem to be.  

• True
• False

It is unsafe for you to work with electricity when you are wet or standing in water.  

• True
• False

It is much safer to pull an electrical cord by pulling the cord instead of the plug.  

• True
• False