4. Electronic fundamentals - Q&A
28 questions found
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The most suitable class of amplifier for a high fidelity radio transmitter is
- B.
- C.
- A.
Class C is specially designed for RF and only that and can't be used for audio
The output of a tachogenerator should be
- exponential.
- linear.
- sinusoidal.
in the question it is not mentioned it is referring to AC
When a hole diffuses from a p-region to the n-region it
- becomes a minority carrier in the n-region.
- lowers the potential barrier.
- raises the potential barrier.
Does that mean current flows through forward biased?
If then, is it right to lower the potential barrier?
Of course, If reverse biased flows, raise the potential barrier.
To function, i.e. conduct, a junction diode made of silicon requires a forward bias of at least
- 0.2v
- 1.41v
- 1v
Please write your question here.
The term "velocity lag" refers to a
- speed error.
- acceleration error.
- position error.
Please write your question here.
What power is required for a desynn indicator system?
- DC.
- AC 400 Hz.
- AC 50 Hz.
Synchros are always supplied with AC. Then why this DC?
If the reverse bias voltage across a diode is too high
- load current reduces to zero.
- load current increases rapidly.
- load current reverses.
Please kindly explain. Also can I get a link or material where I can read up on all the modules.thanks.
The most suitable class of amplifier for a high fidelity radio transmitter is
- B.
- C.
- A.
Please kindly explain. Also can I get a link or material where I can read up on all the modules.thanks.
A Zener diode usually works
- only in reverse bias.
- at variable voltages.
- only in forward bias.
Please kindly explain. Also can I get a link or material where I can read up on all the modules.thanks.
A desynn instrument has a positive regular increasing error, you would adjust
- lever length.
- lever angle and lever length.
- lever angle.
Please kindly explain. Also can I get a link or material where I can read up on all the modules.thanks.
In a printed circuit board , the surface resistance testing is
- insulation resistance between adjacent printed conductor.
- the resistance between the two conductors.
- between the board and the conductor.
Please kindly explain. Also can I get a link or material where I can read up on all the modules.thanks.
In an integrated circuit, the components are mounted
- by metal screws.
- by metal oxide film.
- by means of wires connecting them.
Please kindly explain. Also can I get a link or material where I can read up on all the modules.thanks.
The common collector amplifier is sometimes called the emitter follower circuit because
- the emitter voltage follows the collector voltage.
- the emitter current follows the collector current.
- the emitter voltage follows the base voltage.
Please kindly explain. Also can I get a link or material where I can read up on all the modules.thanks.
A control surface position feedback signal is
- inversely proportional to surface position.
- proportional to surface position.
- non-linear.
Please kindly explain. Also can I get a link or material where I can read up on all the modules.thanks.
A control surface position feedback signal is
- inversely proportional to surface position.
- proportional to surface position.
- non-linear.
Please kindly explain. Also can I get a link or material where I can read up on all the modules.thanks.
With an NPN transistor electrons leave the
- Base.
- Collector.
- Emitter.
Why the elections should leave the emitter?
In a diode clamper, if the resistor is removed making the time constant equal to C x r where r is the reverse resistance of the diode, this will ensure a
- long time constant.
- short time constant.
- variable time constant.
i dont understand this question can anyone plzz explain it ?
The capacitance of a varactor diode is
- inversely proportional with reverse bias voltage.
- a linear function of applied reverse bias voltage.
- directly related to the forward bias voltage.
As reverse voltage increases, depletion layer and therefore capacitance increases proportionally. Am I missing something here?
A Zener diode is used for
- voltage stabilisation.
- rectification.
- voltage regulation.
Isn't regulation the same as stabilization?
An atom with 5 electrons in its outer shell is part of
- a C type material.
- a P type material.
- an N type material.
please explain
A zener diode is designed to operate
- below its breakdown voltage.
- either above or below its breakdown voltage.
- above its breakdown voltage.
below its break down voltage it gives constant voltage....?
Diodes connected in parallel would act like an
- an NAND gate.
- an AND gate.
- an OR gate.
How pls describe
Diodes connected in parallel would act like an
- an NAND gate.
- an AND gate.
- an OR gate.
Why is the answer AND gate? For example,you put 2 diodes parallel to each other. If the current flow through one of the diodes,wouldnt the circuit is still complete?
Damping in a servomechanism is easier to apply if
- the mechanism is light and has high inertia.
- the mechanism is light and has low inertia.
- the mechanism is heavy and has high inertia.
how??? please explain someone....thanks
When an SCR is switched on it has
- low resistance.
- no change in resistance.
- high resistance.
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