BASIC ELECTRONICS QUIZ # 1
NAME:___________________________
1.
A semiconductor diode has how many
junction/s?
A. 1
B. 2
C. 3
D. 4
2.
A diode is in series with a voltage source and
resistor. If it is forward biased and the supply
voltage was increased, the voltage across
the diode:
A. also increases
B. will decrease
C. remains the same
D. any of the above
3.
The conduction band is closest to the
valence band in:
A. semiconductors
B. conductors
C. insulators
D. The distance is the same for all of the
above.
4.
The reverse saturation current of a diode
_______ every 10 degrees Celsius rise in
temperature.
A. doubles
B. triples
C. is halved
D. is constant
5.
What is a type of doping material?
A. extrinsic semiconductor
B. pentavalent material
C. N-type material
D. all of the above
6.
What electrical characteristic of an intrinsic
semiconductor material is controlled by the
addition of impurities?
A. conductivity
B. resistance
C. power
D. all of the above
7.
It a diode equivalent model represented by
an ideal diode, internal resistance and barrier
potential.
A. Ideal Diode Model
B. Simplified Diode Model
C. Piecewise Diode Model
D. all of the above
8.
A PN junction allows current flow when:
A. the p-type material is more positive than
the n-type material
B. the n-type material is more positive than
the p-type material
C. both the n-type and p-type materials
have the same potential
D. there is no potential on the n-type or ptype materials
9.
It is the time between the creation and
disappearance of free electron
A. reverse recovery time
B. forward recovery time
C. recombination
D. lifetime
10. Electrons in the outermost orbit or shell of an
atom are called:
A. free electron
B. negative ions
C. valence electrons
D. conduction electrons
11. How many valence electrons does a silicon
atom have?
A. 0
B. 1
C. 2
D. 4
12. The valence electron of a conductor is also
called a
A. Bound electron
B. Free electron
C. Nucleus
D. Proton
13. When a voltage is applied to a
semiconductor, holes will flow
A. Away from the negative potential
B. Toward the positive potential
C. In the external circuit
D. None of the above
14. A conductor has how many holes?
A. Many
B. None
C. Only those produced by thermal energy
D. The same number as free electrons
15. In an intrinsic semiconductor, the number of
free electrons
A. Equals the number of holes
B.
C.
D.
Is greater than the number of holes
Is less than the number of holes
None of the above
16. Holes act like
A. Atoms
B. Crystals
C. Negative charges
D. Positive charges
17. Trivalent atoms have how many valence
electrons?
A. 1
B. 3
C. 4
D. 5
18. A donor atom has how many valence
electrons?
A. 1
B. 3
C. 4
D. 5
19. If you wanted to produce a p-type
semiconductor, which of these would you
use?
A. Acceptor atoms
B. Donor atoms
C. Pentavalent impurity
D. Silicon
20. Holes are the minority carriers in which type
of semiconductor?
A. Extrinsic
B. Intrinsic
C. n-type
D. p-type
21. If the temperature of a semiconductor
material increases, the number of free
electrons
A. Decreases
B. Increases
C. Remains the same
D. Becomes zero
22. Which of the following is NOT one of the
three distinct regions in the characteristic
curve of a diode?
A. Forward bias region
B. Reverse bias region
C. Breakdown region
D. Saturation region
23. The time it takes to turn off a forward-biased
diode is called the
A. Forward recovery time
B. Reverse recovery time
C. Recombination
D. Turn-off time
24. An acceptor atom contains how many
valence electrons?
A. 1
B. 2
C. 3
D. 4
25. What are the majority current carriers in the
N-type silicon?
A. Free electrons
B. Holes
C. Bounded electrons
D. Protons