ECE QUIZ :3

Online Examination for ECE Quiz Question And Answer

Online Test

1. Which type of transformer is required to create a 180 degree input to a rectifier?

center-tapped secondary
step-down secondary
stepped-up secondary
split winding primary
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2. Which of the following metric prefixes could replace 10–9?

Nano
Mega
Kilo
Micro
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3. Which electromagnetic device uses brushes and a commutator?

A speaker
A dc generator
A relay
A solenoid
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4. Which of the following is the reference vector for parallel RC circuits?

R
V
I
XV
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5. A transformer is plugged into a 120 V rms source and has a primary current of 300 mA rms. The secondary is providing 18 V across a 10 omega.gif load. What is the efficiency of the transformer?

88%
90%
92%
95%
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6. A JFET

is a current-controlled device
has a low input resistance
is a voltage-controlled device
is always forward-biased
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7. Which formula shows a direct proportionality between power and voltage?

V = IR
P = VI
P = IR
I = V/R
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8. With 1 mA of current, what wattage rating should a 470 ohm resistor have?

1/4 watt
1/2 watt
1 watt
2 watts
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9. Ionization within a P-N junction causes a layer on each side of the barrier called the:

junction
depletion region
barrier voltage
forward voltage
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10. When an input delta of 2 V produces a transconductance of 1.5 mS, what is the drain current delta?

666 mA
3 mA
0.75 mA
0.5 mA
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