Practice Electronic Principles Multiple Choice Questions with Answers Quiz-10

Q.1.

For a pure capacitor:

ac current and voltage are exactly in phase
ac current leads the voltage by 90 degree
ac current is converted to dc voltage
ac current lags the voltage by 90 degree
None of the above

Q.2.

What is the phase shift between total current and voltage in the circuit of aohm resistor connected in parallel with a capacitor that has a reactance ofohm

180 degree
30 degree
45 degree
75 degree
None of the above

Q.3.

In an intrinsic semiconductor, the number of free electrons

Equals the number of holes
Is less than the number of holes
Is greater than the number of holes
Impossible to say
None of the above

Q.4.

The component that forms the electrical connection between the rotating coil of wire in a motor and the external source of electrical energy is called the:

rotor
armature
battery
commutator
None of the above

Q.5.

Molecule is

The smallest particle of a substance that retains the properties of that substance
A atom that has a shortage of electrons in its outer orbit
A atom that has an excessive number of electrons in its outer orbit
A atom that flows whenever there is an imbalance of electrical charges between two points
None of the above

Q.6.

A device that converts mechanical into electrical energy is?

solar cell
thermocouple
chemical cell
generator
None of the above

Q.7.

In a pure inductor:

ac current leads the voltage by 90 degree
ac current and voltage are exactly in phase
ac current lags the voltage by 90 degree
ac current is converted to dc voltage
None of the above

Q.8.

What form of energy is used for creating static electricity?

Solar energy
Mechanical energy
Chemical energy
Light energy
None of the above

Q.9.

Which one of the following kinds of materials has the lowest permeability?

A diamagnetic material
A paramagnetic material
A feiTomagnetic material
All of the above
None of the above

Q.10.

Waveforms are graphs that show:

frequency on the vertical axis and amplitude on the horizontal axis
amplitude on the vertical axis and frequency on the horizontal axis
amplitude on the vertical axis and the passage of time on the horizontal axis
the passage of time on the vertical axis and amplitude on the horizontal axis
None of the above

Q.11.

Suppose the zener diode has a breakdown voltage ofV and zener resistance of 8.5 W, what is the additional voltage when the current ismA?

0.17 V
10.17 V
20 V
18.8 V
None of the above

Q.12.

The total impedance of a parallel RLC circuit:

always increases as the applied frequency increases
is equal to the sum of the values of resistance, inductive reactance and capacitive reactance
always decreases as the applied frequency increases
is maximum at the resonant frequency
None of the above

Q.13.

When the collector current increases, what does the current gain do?

decreases
stays the same
increases
any of the above
None of the above

Q.14.

A transistor has a current gain ofand a base current ofµA. What is the collector current?

3.75 mA
3.2 mA
0.05 mA
13 mA
None of the above

Q.15.

The rise time of a pulse waveform is the time required for the voltage to rise:

from zero to its rms value
from zero to its peak value
from 10% of the peak value to 70.7% of the peak value
from 10% of the peak value to 90% of the peak value
None of the above

Q.16.

Which one of the following statements applies to common auto batteries?

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

Q.17.

A transistor has how many doped regions?

1
2
3
4
None of the above

Q.18.

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

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

Q.19.

If N1/N2 =and the primary voltage isV, what is the secondary voltage?

0 V
36 V
40 V
60 V
None of the above

Q.20.

The voltage across a 1Nis 0.when the current is 1A. What is the power dissipation of the diode for these values?

0.93 W
0.93 V
1 A
9.3 W
None of the above

Q.21.

A loadstone is:

a natural magnet
a temporary magnet
an artificial magnet
a paramagnetic alloy
None of the above

Q.22.

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

The total voltage in a parallel circuit is equal to the average value of the individual voltages
The total voltage in a parallel circuit is always less than the value of the smallest voltage
The total voltage is equal to the sum of the voltages across the individual branches in a parallel circuit
The total voltage of a parallel circuit is the same as the voltages across each branch
None of the above

Q.23.

A device that converts light energy to electrical energy is called a:

thermocouple
solar cell
photodiode
photo transistor
None of the above

Q.24.

How much current flows through a 60-W light bulb that is operating atV?

0.5A
180 A
2 A
7200 A
None of the above

Q.25.

Which one of the following phrases most accurately describes a purely capacitive circuit?

Resistances provide the only opposition to current flow
Capacitive reactance provides the only opposition to current flow
The ac voltage leads the current by 90 degree
Combinations of resistance and capacitive reactance provide any opposition to current flow
None of the above

Q.26.

The dielectric constant of a material is a measure of:

the amount of voltage it can withstand before breaking down
how well the material concentrates electrostatic lines of force
the amount of opposition to the current flow
how well the material concentrates magnetic lines of force
None of the above

Q.27.

The saturation point is approximately the same as

cutoff point
lower end of the load line
upper end of the load line
infinity
None of the above

Q.28.

What is the inductive reactance of a 2-H coil operating atHz?

754 Ohm
30 Ohm
60 Ohm
120 Ohm
None of the above

Q.29.

When operating above its resonant frequency, a series RLC circuit has the characteristics of a:

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

Q.30.

What is the primary difference between primary and secondary cell batteries?

Primary-cell batteries can be recharged and used many times, whereas secondary-cell batteries cannot be properly recharged
Secondary-cell batteries can be recharged and used many times, whereas primary-cell batteries cannot be properly recharged
Primary-cell batteries use chemical cells, whereas secondary-cell batteries use an alternative energy source, such as thermal or magnetic energy, to supplement their outputs
Primary-cell batteries must be recharged at a much slower rate that secondary-cell batteries
None of the above

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