ADU_elex

21ST ELECTRONICS AND COMMUNICATIONS ENGINNERING

IECEP-Manila Form 1 S.2011 TEST QUESTIONS

PROFILE OF CONTRIBUTOR

Name of SchoolAdamson University

Address900 San Marcelino Street, Ermita, Manila

Signature over Printed Name , Position

Engr. Ernesto Depano Jr.EcE Department Faculty

Area of Specialization Microelectronics, Control Systems, Mathematics

Please indicate the subject:

( ) General Engineering and Applied Science (X ) Electronics System & Technologies

QUESTION:

What is the bandgap energy for diamonds?

Choices:

a. 2.5eV

b.1.1eV

c.5.6eV

d. 0.1eV

ANSWER:

a. 2.5eV

SOLUTION ( IF PROBLEM -SOLVING)

Reference:

Fundamentals of Microelectronics

Wiley/Razavi 2006Page 20

Endorsed by:

Engr. Evelyn Raguindin

School Representative

IECEP Manila










QUESTION:

_______________ allows simplifying a one-port circuit to a current source in parallel with an impedance.

Choices:

a. Nortons Theorem

b. Thevenins Therorem

c. Kirchoffs Current Law

d. Faradays Law of Magnetic Induction

ANSWER:

a. Nortons Theorem


Reference: Fundamentals of Microelectronics

Wiley/Razavi 2006page 20

Endorsed by:



IECEP Manila










QUESTION:

Charge carriers move in semiconductors via two mechanisms: _____ and _______.

Choices:

a. drift and diffusion

b. drift and avalanche

c. avalanche and diffusion

d. none of the above

ANSWER:

a. drift and diffusion




Endorsed by:



IECEP Manila










QUESTION:

The diffusion current density is proportional to the _________ of the carrier concentration

Choices:

a. gradient

b. curl

c. divergence

d. laplacian

ANSWER:

a. gradient




Endorsed by:



IECEP Manila










QUESTION:

The ___________ is the minimum energy required to dislodge an electron from its covalent

bond.

Choices:

a.barrier potential

b. bandgap energy

c. potential energy

d. diffusion energy

ANSWER:

b. bandgap energy




Endorsed by:



IECEP Manila










QUESTION:

Under a high reverse bias voltage, pn pn junctions break down, conducting a very high current.

Depending on the structure and doping levels of the device, ____________ breakdown may occur.

Choices:

a. Zener

b. Avalanche

c. Drift

d. answers a or b

ANSWER:

d. answers a or b




Endorsed by:



IECEP Manila










QUESTION:

The statement A voltage-dependent current source can form an amplifier along with a load resistor is

Choices:

a. True

b. False

c. Cannot be determined

d. Sometimes True

ANSWER:

a. True


Reference:

Fundamentals of Microelectronics

Wiley/Razavi 2006page161

Endorsed by:



IECEP Manila










QUESTION:

For proper operation, the____________________ is forward-biased and the _____________________ is

reverse-biased.

Choices:

a. base-emitter junction, collector-emitter junction

b. base-emitter junction, base-collector junction

c. collector-base junction, base-emitter junction

d. collector-emitter junction, collector-base junction

ANSWER:

b. base-emitter junction, base-collector junction




Endorsed by:



IECEP Manila










QUESTION:

The ________________ of the bipolar transistor consists of an exponential voltage-dependent

current source tied between the collector and emitter, and a diode (accounting for the base

current) tied between the base and emitter.

Choices:

a. r-paramter model

b. h-parameter model

c. small signal-model

d. large-signal model

ANSWER:

d. large-signal model


Reference:Fundamentals of Microelectronics


Endorsed by:



IECEP Manila










QUESTION:

The ______ stage provides a moderate voltage gain, a moderate input impedance, and a moderate

output impedance.

Choices:

a. common-drain

b. common-collector

c. common-base

d. common-emmiter

ANSWER:

d. common-emmiter




Endorsed by:



IECEP Manila










QUESTION:

The ___________ provides a voltage gain less than unity, a high input impedance, and a low output impedance, serving as a good voltage buffer

Choices:

a. emitter follower

b. common base

c. common emitter

d. common source

ANSWER:

a. emitter follower




Endorsed by:



IECEP Manila










QUESTION:

MOSFETs operate in the ________ region if the drain voltage is more than one threshold below the gate voltage

Choices:

a. triode

b. diode

c. negative resistance

d. constant current

ANSWER:

a. triode




Endorsed by:



IECEP Manila










QUESTION:

A measure of the small-signal performance of voltage-dependent current sources is the _____________ defined as the change in the output current divided by the change in the input voltage.

Choices:

a. impedance

b. conductance

c. transconductance

d. reluctance

ANSWER:

c. transconductance



Wiley/Razavi 2006page312

Endorsed by:



IECEP Manila










QUESTION:

The impedance seen looking into the gate of a MOSFET is equal to ________

Choices:

a. infinity

b. r0c. 1 / gm

d. zero

ANSWER:

a. infinity




Endorsed by:



IECEP Manila










QUESTION:

The _______________ topology exhibits a nominal gain equal to one plus the ratio of

two resistors. The circuit also suffers from a gain error that is inversely proportional to the

gain of the op amp.

Choices:

a. noninverting amplifier

b. inverting amplifier

c. summing amplifier

d. voltage follower

ANSWER:

a. noninverting amplifier


Reference:Fundamentals of Microelectronics


Endorsed by:



IECEP Manila










QUESTION:

Placing a bipolar device around an op amp provides a _____________function

Choices:

a. linear

b. parabolic

c. exponential

d. logarithmic

ANSWER:

d. logarithmic




Endorsed by:



IECEP Manila










QUESTION:

Op amps suffer from various imperfections, including dc offsets and input bias currents.

These effects impact the performance of various circuits, most notably,____________.

Choices:

a. zero-level detector

b. summing amplifier

c. differentiators

d. integrators

ANSWER:

d. integrators




Endorsed by:



IECEP Manila










QUESTION:

Stacking a transistor atop another forms a _______ structure, resulting in a high output

impedance.

Choices:

a. darlington

b. stack

c. cascade

d. cascode

ANSWER:

d. cascode




Endorsed by:



IECEP Manila










QUESTION:

Bipolar differential pairs exhibit a ____________input/output characteristic. The tail

current can be mostly steered to one side with a differential input of about 4Vt.

Choices:

a. parabolic

b. logarithmic

c. hyperbolic tangent

d. exponential

ANSWER:

c. hyperbolic tangent




Endorsed by:



IECEP Manila










QUESTION:

As the frequency of operation increases, capacitances exhibit a ______________, reducing

the gain. The gain thus rolls off at high signal frequencies.

Choices:

a. same impedance

b. slightly higher impedance

c. lower impedance

d. significantly higher

ANSWER:

c. lower impedance




Endorsed by:



IECEP Manila










QUESTION:

To obtain the frequency response, we must derive the ___________ of the circuit.

Choices:

a. logarithmic behavior

b. roll-off rate

c. gain

d. transfer function

ANSWER:

d. transfer function




Endorsed by:



IECEP Manila










QUESTION:

A capacitance tied between the input and output of an inverting amplifier appears at the input

with a factor equal to one minus the gain of the amplifier. This is called _______________.

Choices:

a. Capacitance-gain effect

b. Miller effect

c. Thevenin effect

d. Faraday effect

ANSWER:

b. Miller effect




Endorsed by:



IECEP Manila










QUESTION:

The ________of a feedback system can, in principle, be obtained by breaking the loop,

injecting a test signal, and calculating the gain as the signal goes around the loop. It determines many properties of feedback systems, e.g., gain, frequency response, and I/O impedances.

Choices:

a. loop gain

b. transfer function

c. negative feedback

d. signal flow

ANSWER:

a. loop gain




Endorsed by:



IECEP Manila










QUESTION:

To avoid oscillation, the gain crossover frequency must __________the phase crossover frequency.

Choices:

a. fall below

b. rise above

c. be equal

d. a factor of

ANSWER:

a. fall below


Reference :Fundamentals of Microelectronics


Endorsed by:



IECEP Manila










QUESTION:

The crossover distortion resulting from the dead zone can be reduced by biasing the push-pull

transistors for a small quiescent current

Choices:

a. True

b. False

ANSWER:

a. True


Reference page Fundamentals of Microelectronics

Wiley/Razavi 2006712

Endorsed by:



IECEP Manila










QUESTION:

In low-distortion applications, the output stage may be embedded in a _________

to suppress the nonlinearity.

Choices:

a. open loop

b. positive feedback loop

c.negative feedback loop

d. none of the above

ANSWER:

c.negative feedback loop


ReferenceFundamentals of Microelectronics


Endorsed by:



IECEP Manila










QUESTION:

A push-pull stage operating at high temperatures may suffer from _____________, whereby

the elevated temperatures allow the output transistors to draw higher currents, which in turn

makes them dissipate even more.

Choices:

a. avalanche effect

b. diffusion effect

c. thermal runaway

d. thermal breakover

ANSWER:

c. thermal runaway


ReferenceFundamentals of Microelectronics


Endorsed by:



IECEP Manila IECEP-Manila Form 1 S.2011 TEST QUESTIONS









QUESTION:

The ___________ response provides a sharper transition than Butterworth at the cost of some

ripple in the passband and stopbands. It contains n complex poles on an ellipse

Choices:

a. Thomas

b. Buttord

c. Elliptic

d. Chebyshev

ANSWER:

d. Chebyshev


Reference Fundamentals of Microelectronics


Endorsed by:



IECEP Manila

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Documents

manila signature

ev answer

ev solution

ernesto depano jr

general engineering

control systems

diffusion solution

gradient solution