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272 lines
3.4 KiB
Plaintext
272 lines
3.4 KiB
Plaintext
% FILENAME = N11.TXT
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% Semiconductors
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% Release version 2, January 2000
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% Q 11 modified 6 Mar 2012
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%Question: 1
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#11.1 The basic semiconductor amplifying device is a:
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diode
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transistor
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pn-junction
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silicon gate
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% ans 2
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%Question: 2
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#11.2 Zener diodes are normally used as:
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RF detectors
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AF detectors
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current regulators
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voltage regulators
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% ans 4
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%Question: 3
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#11.3 The voltage drop across a germanium signal diode when conducting is
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about:
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0.3V
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0.6V
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0.7V
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1.3V
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% ans 1
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%Question: 4
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#11.4 A bipolar transistor has three terminals named:
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base, emitter and drain
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collector, base and source
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emitter, base and collector
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drain, source and gate
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% ans 3
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%Question: 5
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#11.5 The three leads from a PNP transistor are named the:
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collector, source, drain
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gate, source, drain
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drain, base, source
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collector, emitter, base
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% ans 4
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%Question: 6
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#11.6 A low-level signal is applied to a transistor circuit input and a
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higher-level signal is present at the output. This effect is known as:
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amplification
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detection
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modulation
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rectification
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% ans 1
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%Question: 7
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#11.7 The type of rectifier diode in almost exclusive use in power supplies is:
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lithium
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germanium
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silicon
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copper-oxide
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% ans 3
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%Question: 8
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#11.8 One important application for diodes is recovering information from
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transmitted signals. This is referred to as:
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biasing
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rejuvenation
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ionisation
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demodulation
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% ans 4
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%Question: 9
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#11.9 In a forward biased pn junction, the electrons:
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flow from p to n
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flow from n to p
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remain in the n region
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remain in the p region
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% ans 2
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%Question: 10
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#11.10 The following material is considered to be a semiconductor:
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copper
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sulphur
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silicon
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tantalum
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% ans 3
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%Question: 11
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#11.11 A varactor diode acts like a variable:
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resistor
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voltage regulator
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capacitor
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inductor
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% ans 3
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%Question: 12
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#11.12 A semiconductor is said to be doped when small quantities of the
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following are added:
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electrons
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protons
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ions
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impurities
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% ans 4
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%Question: 13
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#11.13 The connections to a semiconductor diode are known as:
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cathode and drain
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anode and cathode
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gate and source
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collector and base
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% ans 2
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%Question: 14
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#11.14 Bipolar transistors usually have:
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4 connecting leads
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3 connecting leads
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2 connecting leads
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1 connecting lead
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% ans 2
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%Question: 15
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#11.15 A semiconductor is described as a "general purpose audio NPN device".
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This is a:
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triode
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silicon diode
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bipolar transistor
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field effect transistor
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% ans 3
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%Question: 16
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#11.16 Two basic types of bipolar transistors are:
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p-channel and n-channel types
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NPN and PNP types
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diode and triode types
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varicap and zener types
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% ans 2
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%Question: 17
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#11.17 A transistor can be destroyed in a circuit by:
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excessive light
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excessive heat
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saturation
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cut-off
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% ans 2
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%Question: 18
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#11.18 To bias a transistor to cut-off, the base must be:
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at the collector potential
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at the emitter potential
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mid-way between collector and emitter potentials
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mid-way between the collector and the supply potentials
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% ans 2
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%Question: 19
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#11.19 Two basic types of field effect transistors are:
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n-channel and p-channel
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NPN and PNP
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germanium and silicon
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inductive and capacitive
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% ans 1
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%Question: 20
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#11.20 A semiconductor with leads labelled gate, drain and source, is best
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described as a:
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bipolar transistor
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silicon diode
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gated transistor
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field-effect transistor
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% ans 4
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