Practice Electronic Principles Multiple Choice Questions with Answers Quiz-9

Q.1.

How many types of flow are there in a semiconductor?

0
1
2
3
None of the above

Q.2.

Which one of the following phrases best describes residual magnetism?

Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
The force of attraction between the poles of a permanent and temporary magnetic field
The amount of magnetic flux that is not confined to the core material of an electromagnet
The circular magnetic field that surrounds a conductor carrying a current
None of the above

Q.3.

The knee voltage of a diode is approximately equal to the

Applied voltage
Barrier potential
Breakdown voltage
Forward voltage
None of the above

Q.4.

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

The total current is equal to the sum of the currents for the resistance and capacitance
The current always has the same amplitude and phase for every part of the circuit
The total current is less than the sum of the currents for the resistance and capacitance
The total current. is greater than the sum of the currents for the resistance and capacitance
None of the above

Q.5.

A certain electromagnet hasturns of wire. How much current must flow through the coil in order to generate an mmf ofampere-turns?

0.1 A
1000 A
10 A
100 A
None of the above

Q.6.

Holes are the minority carriers in which type of semiconductor?

Extrinsic
Intrinsic
n-type
p-type
None of the above

Q.7.

A battery is a device composed of one or more:

chemical cells
voltage generators
solar cells
piezoeletric cells
None of the above

Q.8.

Which one of the following devices is most often used for measuring opposition to current flow in a circuit?

Ammeter
Voltmeter
Ohmmeter
Wattmeter
None of the above

Q.9.

A transformer has a primary voltage ofV rms and a secondary voltage ofV rms. If the secondary current isrms, what is the primary current?

7.8 mA
208 mA
200 mA
300 mA
None of the above

Q.10.

A zener regulator has an input voltage fromtoV and a load current from 5 tomA. If the zener voltage is 6.8 V, what value should the series resistor have?

310 Ohm
400 Ohm
410 Ohm
550 Ohm
None of the above

Q.11.

Which one of the following statements is true for current flowing in a series circuit?

The amount of current flow through each part of a series circuit can be different, depending on the resistance of each part and the amount of voltage applied to it
The total current in a series circuit is equal to the sum of the currents flowing through the individual components in the circuit
The same current flows through every part of a series circuit
The total current in a series circuit is equal to the total voltage multiplied by the total resistance
None of the above

Q.12.

If a load resistance is 1 kW, a stiff current source has a resistance of

At least 10 Ohm
Less than 10 Ohm
More than 100 k Ohm
Less than 100 k Ohm
None of the above

Q.13.

Doubling the number of turns of wire in an inductor:

reduces the value of inductance by one-half
multiplies the value of inductance by two
multiplies the value of inductance by four
reduces the value of inductance by one-fourth
None of the above

Q.14.

Doubling the operating voltage of a purely capacitive circuit:

has no effect on the capacitive reactance
doubles the amount of capacitive reactance
multiplies the capacitive reactance by 7
cuts the capacitive reactance in half
None of the above

Q.15.

What form of energy is used to maintain an imbalance of charges between the terminals of a battery?

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

Q.16.

Household light bulbs have a given power rating, and they operate atV. Which one of the following equations most directly provides the current rating of these light bulbs?

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

Q.17.

The rms value of a sine waveform is:

the number of cycles completed in one second
the time required to complete one full cycle
equal to 0.707 times the peak amplitude
equal to 1.41 times the peak amplitude
None of the above

Q.18.

The total inductance of a series inductor circuit is:

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

Q.19.

A flashlight battery has internal resistance of 1W. For what values of load resistance does the flashlight battery appear stiff?

60 Ohm
50 Ohm
100 Ohm or more
10 Ohm
None of the above

Q.20.

A farad is defined as the amount of capacitance necessary for:

dissipating 1 W of power
causing an ac phase shift greater than 90 degree
storing 1 V for 1 second
changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing
None of the above

Q.21.

How much current flows through a 0.02-H choke that is operating from a 12-V ac, 100-Hz source?

0.02 A
0.955 A
10 A
2.02 A
None of the above

Q.22.

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

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

Q.23.

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

Resistances provide the only opposition to current flow
Inductive reactance provides the only opposition to current flow
Combinations of resistance and inductive reactance provide any opposition to current flow
The ac voltage lags the current by 90 degree
None of the above

Q.24.

Which one of the following is a direct statement of Ohm's law?

The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it
The total resistance of a parallel circuit is less than the value of the smallest resistance
The algebraic sum of voltages in a loop is equal to zero
The algebraic sum of currents entering and leaving a point is equal to zero
None of the above

Q.25.

When the graph of current versus voltage is a straight line, the device is referred to as

Active
Linear
Nonlinear
Bipolar
None of the above

Q.26.

The number of free electrons and holes in intrinsic semiconductor increases when the temperature

Decreases
Increases
Stays the same
0^oC
None of the above

Q.27.

What is the capacitive reactance of a 0.1 micro F capacitor that is operating atHz?

less than 1 Ohm
1590 Ohm
312 Ohm
690 Ohm
None of the above

Q.28.

The transistor has a collector current ofmA and a base current ofmA. What is the current gain of the transistor?

250 μA
350 μA
0.25 μA
300 μA
None of the above

Q.29.

The equivalent of 1 micro A is:

10000A
1000 A
one-millionth of an ampere
one million amperes
None of the above

Q.30.

A high-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
increases the level of all frequencies by a significant amount
None of the above

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