Star Tech Journal

STAR*TECH JOURNAL/OCTOBER 1983
26
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The names of various Star*Tech Journal
Advertisers comprise this issue's word
puzzle. Find and encircle these words as
they appear below. They run vertically,
horizontally, diagonally and sometimes
backwards.
S*TJ ADVERTISERS
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Find these hidden words in the above puzzle:
RCA
COIN
CROWN
AMAZIN
NEWTONE
REPAIRS
SPECTRA
BALLY
BOBS
HOFFMAN
RIPPY
SFMUSIC
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64. PNP transistors are less widely used than NPN types because:
a) they were only recently invented, so designers are less familiar with them.
b) they perform an altogether different operation than NPN transistors - a function
that happens to be considerably less useful.
c) they are generally slower in operating speed than NPN types.
d) they are generally more costly to manufacture than NPN types.
e) c and d above.
65. The hFE or "beta" of a transistor is:
a) the noise figure.
b) the current gain.
c) the ratio of output signal current to input signal current
d) the degree of current amplification of the transistor.
e) All but a above.
lnQulzltive Answers (September) 56)a
57)a
58)e
59)e
60)a
StaNtTech Journal Technical Seminars
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63. What is the advantage of using an NPN and a PNP transistor instead of two NPN
transistors in a class B amplifier (that is, "push-pull" type- in which one transistor is
on when the other is off)?
a) The PNP is cheaper and works just as well.
b) There is no particular advantage. An NPN can do the very same thing that the
PNP does.
c) The PNP transistor can regulate alternating current passing through it
d) The input can be connected fairly simply and directly to both transistor bases,
because the PNP turns on when conventional current is withdrawn from the base
while the NPN turns on when conventional current is pumped into the base.
e) None of the above.
Left to themselves, things tend to go from bad to worse.
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62. Which symbol is the PNP transistor?
MURPHY'S LAW #508
T M
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transistor performs as a switch or an amplifier is:
a) the type of transistor.
b) the control circuit which provides the input signal to the transistor.
c) the working circuit
d) the transistor package.
d) None of the above.
I
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61. In a basic transistor circuit, the most significant factor which detennines whether the
Distributror-sponsored S•TJ Technical Seminars are available to any distributor
interested in assisting their clients understand operation and maintenance of videos, pins
and lasers.
If you'd like to sponsor this 5-day course, contact Star*Tech Journal at 609/662-3432
and ask for our information package. This package helps you plan your promotion for a
successful seminar.
Here is the answer key
to September's puzzle:
GAME SYNONYMS
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IN
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OLD ADDRESS
0
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NEW ADDRESS
Address _ _ _ _ _ _ _ _ _ _ _ _