Practice Electronic Principles Multiple Choice Questions with Answers Quiz-11

Q.1.

What is a negative ion?

An atom that contains more electrons than neutrons
An atom that contains more protons than neutrons
An atom that contains more electrons than protons
An atom that contains more protons than electrons
None of the above

Q.2.

Which one of the following principles best describes the basic operation of an electromagnet?

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

Q.3.

Which one of the following statements is true for the voltage in a parallel RC 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 capacitance
The total voltage leads the total current by less than 90 degree
The total voltage is less than the sum of the voltages across the resistance and capacitance
None of the above

Q.4.

In a transistor operates at the middle of the load line, an increase in the base resistance will move the Q point

down
up
nowhere
off the load line
None of the above

Q.5.

The transistor has a collector current of 2 mA. If the current gain iswhat is the base current?

14.8 µA
10.3 µA
7.8 µA
7.75 µA
None of the above

Q.6.

The north pole of a magnet is the one:

that has its molecules arranged in a random pattern
that would be attracted to the earth's north magnetic pole
that would be repelled by the south pole of another magnet
that would be attracted to the earth's south magnetic pole
None of the above

Q.7.

What is the impedance of a circuit composed of aohm resistor connected in parallel with an inductor that has a reactance ofW?

77.7 ohm
89.3 ohm
88.8 ohm
224 ohm
None of the above

Q.8.

What is the smallest number of polarities required for current flow?

One - a negative terminal
Two - a negative terminal and a positive terminal
Three - negative, positive and neutral terminals
Four - two negative and two positive
None of the above

Q.9.

Which one of the following equations most directly determines the power dissipation of a resistance when you know the voltage drop and amount of resistance?

P = I²R
P = IE
P = E²/R
I = P/E
None of the above

Q.10.

What is the barrier potential of a silicon diode at room temperature?

0.7V
0.3V
1 V
2 m V per degree Celsius
None of the above

Q.11.

The direction of electron current flow is:

from right to left
from positive to negative
from negative to positive
from neutral to positive
None of the above

Q.12.

The value of a capacitor can be made larger by:

increasing the area of the plates
decreasing the area of the plates
increasing the frequency of the applied voltage
increasing the voltage applied to the plates
None of the above

Q.13.

Which one of the following statements most accurately applies to the frequency of a waveform?

The actual frequency of a sine waveform is 1.41 times the working frequency
Unless specified otherwise, the frequency of a waveform is assumed to be 60 Hz
The higher the amplitude of a waveform, the higher its frequency
The longer the period of a waveform, the lower its frequency
None of the above

Q.14.

Voltage is

The flow of charged particles through a material
The smallest electrically charged particle
Trie force that causes electrons to flow
The number of free electrons in an atom
None of the above

Q.15.

Current and voltage are said to be in phase when:

their waveforms are both ac or both dc
they have the same amplitude and frequency
their waveforms cross through zero and reach positive and negative peaks at the same time
All of the above
None of the above

Q.16.

A resistor has a rated value ofohm and a tolerance of 10%. What is its minimum and maximum allowable resistance value?

90 Ohm - 101 ohm
90 Ohm - 110 ohm
98 Ohm - 100.1 ohm
99 Ohm - 102 ohm
None of the above

Q.17.

The nucleus of the copper atom contains how many protons?

1
4
18
29
None of the above

Q.18.

A diode is in series with 220W. If the voltage across the resister is 4V, what is the current through the diode?

55 A
55.86 A
18.2 mA
16.3 mA
None of the above

Q.19.

The equivalent of 1 megohms is:

1 k ohm
100,000 ohm
one-millionth of an ohm
one million ohms
None of the above

Q.20.

The Norton current is sometimes called the

Shorted-load current
Open-load current
Thevenin current
Thevenin voltage
None of the above

Q.21.

A device that converts mechanical pressure to electrical energy is called a:

piezoelectric device
solar cell
photodiode
nicad cell
None of the above

Q.22.

The value of a capacitor can be made larger by:

moving the plates further apart
moving the plates closer together
increasing the voltage applied to the plates
decreasing the voltage applied to the plates
None of the above

Q.23.

The merging of a free electron and a hole is called

Covalent bonding
Lifetime
Recombination
Thermal energy
None of the above

Q.24.

What is the turns ratio for the transformer specified in the above question?

10.738
0.707
1.5
0.575
None of the above

Q.25.

Silicon atoms combine into an orderly pattern called a

Crystal
Covalent bond
Semiconductor
Valence orbit
None of the above

Q.26.

When a parallel 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

Q.27.

Which one of the following statements is true for the impedance of a series RC circuit?

The impedance is greater than the sum of the resistance and capacitive reactance
The impedance is equal to the sum of the resistance and capacitive reactance
The impedance is greater than either the resistance or capacitive reactance but less than their sum
The impedance is less than the sum of the resistance and capacitive reactance
None of the above

Q.28.

Which one of the following phrasers best describes flux density?

The concentration of lines of magnetic force
The rate of change of the number of lines of magnetic force
The opposition to a build-up of magnetic fields
The force that maintains lines of force
None of the above

Q.29.

If the base supply voltage increases, the Q point moves

down
up
nowhere
off the load line
None of the above

Q.30.

An audio transformer has a turn ratio ofWhat is its impedance ratio?

81
85
6
9
None of the above

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