UNIT TEST 1

ELECTRONICS 2
UNIT TEST 1
Name: ________________________________________ Date:

Instructor: ___________________________________ Score: ___________

Instruction: Read the question carefully and encircle the correct answer for each of the following question. No solution no point.

1. Which transistor region is very thin and lightly doped?
A. emitter region B. collector region C. anode region D. base region
2. In a transistor which is the largest in all doped regions?
A. emitter region B. collector region C. anode region D. base region
3. For a typical transistor, which two currents are nearly the same?
A. IB & IE B. IC & IE C. IB & IC D. none of the above
4. In what operating region does the collector of a transistor acts like a current source?
A. active region B. saturation region C. cut off region D. breaks down region
5. A transistor operating in the active region has a base current IB of 20 micro amps. If βDC is equal to 250. How much is the collector current IC ?
A. 50 mA B. 5 mA C.12.5 mA D. 80 micro amp
6. Which of the following biasing technique produces the most unstable Q point?
A. voltage divider bias B. emitter bias C. Collector bias D. Base bias
7. When transistor is in saturation,
A. VCE =VCC B. IC= 0 amp C. VCE= 0 volt D. VCE = ½ VCC
8. In transistor which current is the largest?
A. Ic B. IE C. IB D. ID
9. What is the βDC of a transistor whose aDC is is 0.996?
A. 249 B.100 C. 150 D. Impossible to determine
10. Calculate the DC alpha for the value of beta DC of 50.
A. 0.98 B. 0.99 C. 0.998 D. impossible to determine
11. A 12 volt zener diode has a 1 watt power rating. What is the the maximum current rating?
A. 120 mA B. 83.33 mA C. 46.1mA D. 1 A
12. In a loaded zener regulator, the series resistor has a current, IS of 120mA. If the load current, IL series is 45 mA, how much is the zener current IZ.
A. 45 mA B. 165 mA C. 75 mA D. this is impossible to détermine
13. What is the minority current carrier at the base of NPN transistor?
A. free electron B. holes C. Proton D. none of the above
14. Bipolar or BJT (Bipolar Junction Transistor) uses both electron and holes as carier. It is current controlled the output current depends on input current.
A. Bipolar Junction Transistor B. field effect transistor
C. mosfet D. triac
15. Which transistor region is the most heavily doped?
A. emitter region B. collector region C. anode region D. base region