Easa module 4 Electronic Fundamentals 1

In the Boolean algebra statement below, the gate described is
F = A.B.C
a) Nand
b) Nor
Ans c) And
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With a small amplitude voltage, what type of diode would you use to produce the output waveform?
Ans a) shottky

b) Gunn
c) Zener
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An increase in negative feedback to the servo amplifier
Ans a) increases amplifier stability
b) decreases amplifier stability
c) has no effect
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How is a push-pull transistor arrangement connected?
Ans a) emitter to emitter
b) collector to collector
c) base to base
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Thermal runaway in a transistor is caused by
Ans a) excessive heat causing maximum current flow
b) excessive heat causing minimum current flow
c) low heat causing minimum current flow
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A single integrated circuit Op Amp has how many pins?
a) 4
b) 7
Ans c) 8
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What is the output of the amplifier shown below?
a) 0V
b) 3V
Ans c) 5V
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A thyristor is commonly used for
a) voltage regulation
b) overvolts regulation
Ans c) rectification
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A diode which emits photons when conducting is a
a) zener
b) varactor
Ans c) light emitting
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Avalanche breakdown occurs when
a) forward bias becomes excessive
b) forward bias exceeds a certain value
Ans c) reverse bias exceeds a certain value
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The electrodes of an SCR are
a) anode, cathode, source
b) source, drain, gate
Ans c) gate, cathode, anode
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What gives an LED its colour?
a) A gas
b) The cover
Ans c) Composition and impurity of the compound
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For conduction of a transistor the emitter junction is
Ans a) fwd biased
b) reverse biased
c) fwd or reverse as appropriate to the input signal
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In a PNP transistor which way does conventional current flow
a) base to emitter
b) collector to emitter
Ans c) emitter to collector
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Infinite gain, infinite input impedance & zero output impedance is characteristic of a
a) Class A amp
b) Class B amp
Ans c) Op amp
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Forward voltage of a silicon diode is
Ans a) 0.6V
b) 0.2V
c) 1.6V
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An advantage of a common emitter is
a) it is a voltage follower
Ans b) it has high power gain
c) it has high voltage gain
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What amplifier is biased at cut off
a) A
b) B
Ans c) C
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When testing a transitor with an ohmmeter, what is the resistance of the emitter/collector?
a) High resistance one way
Ans b) High resistance both ways
c) Low resistance both ways
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What is the typical volts drop across an LED
Ans a) 1.6V
b) 0.2V
c) 0.4V
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What diode gives off light photons when forward biased
Ans a) LED
b) Shottky diode
c) Gunn diode
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A logic circuit with more than one gate will have
Ans a) one of 2 states of logic output
b) 2 or more outputs
c) an analogue output
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This is a diagram of
a) an SCR
b) a transistor
Ans c) a photo diode
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In a synchro, what is used to convert signals from one form to another?
a) Transmitter
Ans b) Transducer
c) Transformer
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Components on an integrated circuit are
a) in the solid
b) don't need them
Ans c) on the surface
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What diode is used to stop power spikes in a coil?
Ans a) Two directional zener diode
b) Shottky diode
c) Gunn diode
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The anode of a diode is connected to a +4v DC supply and the cathode is connected to a +2v DC supply. The diode is
a) forward biased not conducting
b) reverse biased not conducting
Ans c) forward biased conducting
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Using electron flow in a diode the current flows from
a) Anode to Cathode
Ans b) Cathode to Anode
c) Cathode to Base
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A control surface position feedback signal is
Ans a) proportional to surface position
b) inversely proportional to surface position
c) non-linear
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In a PNP transistor, conventional current will flow when
Ans a) the emitter is more positive than the base
b) the base is more positive than the emitter
c) the collector is more positive than the emitter
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An E&I transformer out of datum has
a) equal and opposite voltages in each windings
Ans b) unequal and opposite voltages in both windings
c) no voltage in either winding
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A gyro will provide
a) rate feedback
b) velocity feedback
Ans c) positional feedback
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In a common collector circuit the output and input are
a) out of phase by 90o
Ans b) in phase