FIRE ALARM

The number of depletion layers in a transistor is …………

A.) One

B.) Two

C.) Three

D.) Four

• A

• B

• C

• D

The element that has the biggest size in a transistor is ………………..

A. Emitter

B. Base

C. Collector

D. Collector-Base-Junction

• A

• B

• C

• D

3. In a transistor ………………..

A. IC = IE + IB

B. IB = IC + IE

C. IE = IC – IB

D. IE = IC + IB

• A

• B

• C

• D

4. The wavelength of infrared sensor is from ____________ ?

A. 760nm-1mm

B. 760mm-1mm

C. 760mm

D. None of the above

• A

• B

• C

• D

5. The operating principle of infrared sensors is?

A. Pyroelectric effect

B. Doppler-effect

C. Both a and b

D. None of the above

• A

• B

• C

• D

Which one of the following needs line of sight?

A. Bluetooth

B. Infrared

C. Both a and b

D. None of the above

• A

• B

• C

• D

The wavelength of visible light is from ____________ ?

A. 700nm-1mm

B. 700mm-1mm

C. 360-700nm

D. None of the above

• A

• B

• C

• D

What does 'doping' do?

A. Changes a semiconductor's behavior

B. Duplicate the semiconductor

C. Oxygenate a semiconductor

D. Purifies a semiconductor

• A

• B

• C

• D

A low input to the transistor gives __________

A. Low output

B. High Output

C. Normal Output

D. No Output

• A

• B

• C

• D

In the active region the emitter-base junction is --------biased and base-collector junction is---------biased?

A. Reversed biased, Forward biased

B. Forward biased, Forward biased

3. C. Reversed biased, Reversed biased

D. Forward biased, Reverse biased

• A

• B

• C

• D