passes lower-frequency signals and reduces higher-frequency signals

passes higher-frequency signals and reduces lower-frequency signals

reduces the level of all frequencies by a significant amount

Practice Electronic Principles Multiple Choice Questions Quiz-1

Q.1

What is one important thing transistors do?

Emit light
Amplify weak signals
Regulate voltage
Rectify line voltage
None of the above

Q.2

At room temperature an intrinsic silicon crystal acts approximately like

a battery
a conductor
an insulator
a piece of copper wire
None of the above

Q.3

Which one of the following statements regarding ac circuits is correct?

Current and voltage are in phase through an inductor
Current leads the voltage through an inductor
Current lags the voltage through an inductor
All of the above
None of the above

Q.4

Doubling the operating frequency of a capacitive circuit:

doubles the amount of a capacitive reactance
has no effect on the capacitive reactance
cuts the capacitive reactance in half
multiplies the capacitive reactance by 6.28
None of the above

Q.5

A step-up transformer has a turns ratio of 1:4. If the line voltage is 115 V rms, what is the peak secondary voltage?

700 V
707 V
651 V
208 V
None of the above

Q.6

Which one of the following principles best describes the basic operation of a generator?

Like magnetic poles repel; unlike poles attract
Current is induced in a conductor that is moving through a magnetic field
Like magnetic poles attract; unlike poles repel
Current flowing through a conductor generates a magnetic field
None of the above

Q.7

The current gain of a transistor is defined as the ratio of the collector current to the

base current
emitter current
supply current
collector current
None of the above

Q.8

What is the total resistance of a parallel circuit that contains two resistors having values of 220 ohm and 470 ohm?

220 ohm
150 ohm
445 ohm
690 ohm
None of the above

Q.9

The equivalent of 1 kV is:

1.00 V
1000 V
100 mV
1000 mV
None of the above

Q.10

What is the algebraic sum of this series of values:+2, -3, -6,+4?

-6
-3
0
2
None of the above

Q.11

When operating below its resonant frequency, a parallel RLC circuit has the characteristics of a:

parallel RL circuit
parallel RC circuit
parallel RLC circuit operated above its resonant frequency
purely resistive circuit
None of the above

Q.12

The net charge of a neutral copper atom is

0
1
-1
4
None of the above

Q.13

Which one of the following statements is true for the voltage in a parallel RL circuit?

The voltage always has the same amplitude and phase for every part of the circuit
The total voltage is equal to the sum of the voltages across the resistance and inductance
The total voltage lags the total current by less than 90
The total voltages is less than the sum of the voltages across the resistance and inductance
None of the above

Q.14

The period of a waveform is:

the time required to complete one full cycle
the number of cycles completed in one second
the time required for the voltage to rise from 10% to 90% of the peak amplitude
equal to 0.707 times the peak amplitude
None of the above

Q.15

The total inductive reactance of a parallel inductor circuit is:

equal to the sum of the individual inductive-reactance values
equal to the sum of the individual inductance values
equal to the source voltage divided by total current
less than the inductance value of the smallest inductor
None of the above

Q.16

A step-down transformer has turns ration of 5:1. If the primary voltage is 120 Vrms, what is the secondary voltage?

12 V
18 V
24 V
30 V
None of the above

Q.17

Norton's theorem replaces a complicated circuit facing a load by an

Ideal voltage source and parallel resistor
Ideal current source and parallel resistor
Ideal voltage source and series resistor
Ideal current source and series resistor
None of the above

Q.18

What causes the depletion layer?

Doping
Recombination
Barrier potential
Ions
None of the above

Q.19

Which one of the following statements most accurately reflects the nature of ac power?

The current in an ac circuit flows in one direction, but changes value periodically
The current in an ac circuit flows in one direction at a steady level
The current in an ac circuit changes direction periodically
The current in an ac circuit flows in two directions at the same time
None of the above

Q.20

A low-pass filter:

passes lower-frequency signals and reduces higher-frequency signals
passes higher-frequency signals and reduces lower-frequency signals
has no effect on ac signals
reduces the level of all frequencies by a significant amount
None of the above

Q.21

Which one of the following equations most directly leads to the resistance of an ordinary household light bulb, assuming that you know the power and voltage rating?

R = E²/P
P = PR
P = E²/R
I = P/E
None of the above

Q.22

The total capacitive reactance of a parallel capacitor circuit is:

equal to the sum of the individual capacitive-reactance values
equal to the sum of the individual capacitance values
equal to the source voltage divided by total current
less than the capacitance value of the smallest capacitor
None of the above

Q.23

Thevenin theorem replaces a complicated circuit facing a load by an

Ideal voltage source and parallel resistor
Ideal current source and parallel resistor
Ideal voltage source and series resistor
Ideal current source and series resistor
None of the above

Q.24

What kind of device is a diode?

Bilateral
Linear
Nonlinear
Unipolar
None of the above

Q.25

Which one of the following statements applies to common, non-rechargeable flashlight batteries?

Common flashlight batteries are secondary wet-cell batteries
Common flashlight batteries are primary wet-cell batteries
Common flashlight batteries are primary dry-cell batteries
Common flashlight batteries are secondary dry-cell batteries
None of the above

Q.26

Which one of the following statements best applies to a series RLC circuit?

The voltage waveform for each component always has the same amplitude and phase as the applied voltage
The current waveform for each component always has the same amplitude and phase as the applied current
All of the above
The sum of the current is always less than the applied current
None of the above

Q.27

When applying a square waveform to a capacitor, the circuit tends to:

peak the voltage and round off the current waveforms
peak the current and round off the voltage waveforms
round off both the voltage and current waveforms
peak both the voltage and current waveforms
None of the above

Q.28

Which one of the following properties of a magnetic circuit can be directly compared to current in an electrical circuit?

Number of lines of force
Flux density
Reluctance
Magnetomotive force
None of the above

Q.29

Who invented the first junction transistor?

Smith
Gomes
Fisher
Shockley
None of the above

Q.30

When a series RLC circuit is operating at its resonant frequency:

capacitive reactance is greater than the inductive reactance
inductive reactance is greater than the capacitive reactance
inductive reactance is equal to the capacitive reactance
the difference between inductive and capacitive reactance is equal to the resistance
None of the above