An imbalance of electrical charges

The flow of charged particles through a material

An imbalance of electrical charges

The force that causes electrons to flow

The number of free electrons in an atom

The Thevenin resistance is equal in value to the

Internal resistance of a Morton circuit

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

The total voltage is equal to the sum of the voltages across the resistance and inductance

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

At room temperature a conductor has low many holes?

Only those produced by thermal energy

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

parallel RLC circuit operated above its resonant frequency

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

The total voltage in a series circuit is equal to the average value of the individual voltages

The total voltage is equal to the sum of the individual voltages in a series circuit

The total voltage in a series circuit is equal to the average value of the individual voltages

The total voltage of a series circuit is equal to the total current divided by the total resistance

The total voltage in a series circuit is always less than the value of the smallest voltage

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

The current in an ac circuit flows in two directions at the same time

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

Doubling the operating frequency of a capacitive circuit:

multiplies the capacitive reactance by 6.28

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

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

series RLC circuit operated above its resonant frequency

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

The total current leads the total voltage by less than 90

The total current is equal to the sum of the currents through the resistance and inductance

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 through the resistance and inductance

The total current leads the total voltage by less than 90

Doubling the number of turns of wire in an inductor:

reduces the value of inductance by one-fourth

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

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

Doubling the operating voltage of a purely capacitive circuit:

doubles the amount of capacitive reactance

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

Doubling the operating frequency of a purely inductive circuit:

increases the current, but by an amount that can be determined only by doing a complete analysis of the circuit

doubles the amount of current through the inductors

has no effect on the current through the inductors

cuts the current through the inductors one-half

increases the current, but by an amount that can be determined only by doing a complete analysis of the circuit

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

The current always has the same amplitude and phase for every part of the 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

Which one of. the following phrases most accurately describes the nature of a pulsating dc voltage?

The voltage causes current to flow in two directions at the same time

The voltage remains at one polarity and at a steady level

The voltage remains at one polarity but changes value periodically

The voltage causes current to flow in two directions at the same time

The voltage reverses polarity periodically

One henry of inductance is defined as:

the amount of inductance required to change the frequency of a current by 1 Hz

the amount of counter emf required to reduce a current to 1 A

the amount of inductance required for generating 1 V of counter emf when the current changes at the rate of 1 A per second

the amount of inductance required to change the frequency of a current by 1 Hz

the number of turns of wire in an inductor multiplied by the amount of current flowing through it

Which one of the following statements is true for the currents in a series 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 equal to 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

The total current is less than the sum of the currents for the resistance and capacitance

The value of a capacitor can be made larger by:

decreasing the area of the plates

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

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

causing an ac phase shift greater than 90 degree

changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing

Waveforms are graphs that show:

the passage of time on the vertical axis and amplitude on the horizontal axis

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

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

Like magnetic poles attract; unlike poles repel

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

passes lower-frequency signals and reduces higher-frequency signals

passes higher-frequency signals and reduces lower-frequency signals

increases the level of all frequencies by a significant amount

ac current is converted to dc voltage

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

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

The impedance is less than the sum of the resistance and capacitive reactance

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

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

Three - negative, positive and neutral terminals

Two - a negative terminal and a positive terminal

Three - negative, positive and neutral terminals

Four - two negative and two positive

231 + Mcqs in Electronic Principles in Computer Science Page 3 McqOptions

101.	Who invented the first junction transistor?
A.	Smith
B.	Gomes
C.	Fisher
D.	Shockley
Answer» E.

Discussion

102.	If the current gain is 200 and the collector current is 100 mA, the base current is
A.	2 mA
B.	0.5 mA
C.	0.083333333333333
D.	200 A
Answer» C. 0.083333333333333

Discussion

103.	Current is
A.	The flow of charged particles through a material
B.	An imbalance of electrical charges
C.	The force that causes electrons to flow
D.	The number of free electrons in an atom
Answer» B. An imbalance of electrical charges

Discussion

104.	A typical light switch in your home is a:
A.	knife switch
B.	toggle switch
C.	rotary switch
D.	momentary push button switch
Answer» C. rotary switch

Discussion

105.	Silicon atoms combine into an orderly pattern called a
A.	Crystal
B.	Covalent bond
C.	Semiconductor
D.	Valence orbit
Answer» B. Covalent bond

Discussion

106.	The Thevenin resistance is equal in value to the
A.	Load resistance
B.	Half the load resistance
C.	Internal resistance of a Morton circuit
D.	Open-load resistance
Answer» B. Half the load resistance

Discussion

107.	The saturation point is approximately the same as
A.	cutoff point
B.	lower end of the load line
C.	upper end of the load line
D.	infinity
Answer» D. infinity

Discussion

108.	The barrier potential accross each depletion layer is
A.	0
B.	0.8 V
C.	0.7 V
D.	20 V
Answer» D. 20 V

Discussion

109.	How much current flows through a 60-W light bulb that is operating at 120 V?
A.	0.5A
B.	180 A
C.	0.083333333333333
D.	7200 A
Answer» B. 180 A

Discussion

110.	Which one of the following kinds of materials has the highest permeability?
A.	A diamagnetic material
B.	A ferromagnetic material
C.	A paramagnetic material
D.	All of the above
Answer» C. A paramagnetic material

Discussion

111.	Which one of the following statements is true for the voltage in a parallel RL circuit?
A.	The voltage always has the same amplitude and phase for every part of the circuit
B.	The total voltage is equal to the sum of the voltages across the resistance and inductance
C.	The total voltage lags the total current by less than 90
D.	The total voltages is less than the sum of the voltages across the resistance and inductance
Answer» B. The total voltage is equal to the sum of the voltages across the resistance and inductance

Discussion

112.	The Norton current is sometimes called the
A.	Shorted-load current
B.	Open-load current
C.	Thevenin current
D.	Thevenin voltage
Answer» B. Open-load current

Discussion

113.	At room temperature a conductor has low many holes?
A.	Same number as free electrons
B.	many
C.	Only those produced by thermal energy
D.	less than the free electrons
Answer» B. many

Discussion

114.	Most AC power is obtained from:
A.	generators
B.	batteries
C.	oscillators
D.	lightning
Answer» D. lightning

Discussion

115.	Determine the resistance value and tolerance of a resistor that has the following color bands; first band is red, second band is red, third band is orange, and the fourth band is gold
A.	220 Ohm, 5%
B.	220 Ohm, 10%
C.	22,000 Ohm, 5%
D.	22, 000 Ohm, 10%
Answer» D. 22, 000 Ohm, 10%

Discussion

116.	A step-down transformer has turns ration of 5:1. If the primary voltage is 120 Vrms, what is the secondary voltage?
A.	12 V
B.	18 V
C.	24 V
D.	30 V
Answer» D. 30 V

Discussion

117.	Electron current is flowing through a conductor in a direction you might describe as straight into this page. What is the direction of the resulting magnetic field?
A.	Clockwise
B.	Counterclockwise
C.	Out of this page
D.	Into this page
Answer» C. Out of this page

Discussion

118.	Which one of the following equations most directly determines the amount of current flowing through a resistor when you know the value of the resistor and the voltage drop across it?
A.	E = PR
B.	E = I2R
C.	I = E/R
D.	I = ER
Answer» D. I = ER

Discussion

119.	When operating below its resonant frequency, a parallel RLC circuit has the characteristics of a:
A.	parallel RL circuit
B.	parallel RC circuit
C.	parallel RLC circuit operated above its resonant frequency
D.	purely resistive circuit
Answer» B. parallel RC circuit

Discussion

120.	A loadstone is:
A.	a natural magnet
B.	a temporary magnet
C.	an artificial magnet
D.	a paramagnetic alloy
Answer» B. a temporary magnet

Discussion

121.	Which one of the following is most likely used for measuring the rate of electron flow?
A.	Voltmeter
B.	Ammeter
C.	Wattmeter
D.	Ohmmeter
Answer» C. Wattmeter

Discussion

122.	A zener diode has a voltage of 10 V and a current of 20 mA. What is the power dissipation?
A.	200 mW
B.	300 mW
C.	20 mW
D.	10 mW
Answer» B. 300 mW

Discussion

123.	Suppose a step-down transformer has a turns ration of 5:1. If the secondary current is 1A rms, what is the primary-current?
A.	0.3 A
B.	0.2 A
C.	0.4 A
D.	0.6 A
Answer» C. 0.4 A

Discussion

124.	Which one of the following statements is true for voltage in a series circuit?
A.	The total voltage is equal to the sum of the individual voltages in a series circuit
B.	The total voltage in a series circuit is equal to the average value of the individual voltages
C.	The total voltage of a series circuit is equal to the total current divided by the total resistance
D.	The total voltage in a series circuit is always less than the value of the smallest voltage
Answer» B. The total voltage in a series circuit is equal to the average value of the individual voltages

Discussion

125.	What is the turns ratio of a power transformer that shows 50 V at its secondary winding when you apply 150 V to its primary winding?
A.	43556
B.	43525
C.	2
D.	3
Answer» E.

Discussion

126.	Which one of the following statements most accurately reflects the nature of ac power?
A.	The current in an ac circuit flows in one direction, but changes value periodically
B.	The current in an ac circuit flows in one direction at a steady level
C.	The current in an ac circuit changes direction periodically
D.	The current in an ac circuit flows in two directions at the same time
Answer» D. The current in an ac circuit flows in two directions at the same time

Discussion

127.	Doubling the operating frequency of a capacitive circuit:
A.	doubles the amount of a capacitive reactance
B.	has no effect on the capacitive reactance
C.	cuts the capacitive reactance in half
D.	multiplies the capacitive reactance by 6.28
Answer» D. multiplies the capacitive reactance by 6.28

Discussion

128.	When operating below its resonant frequency, a series RLC circuit has the characteristics of a:
A.	series RL circuit
B.	series RC circuit
C.	series RLC circuit operated above its resonant frequency
D.	purely resistive circuit
Answer» C. series RLC circuit operated above its resonant frequency

Discussion

129.	Which one of the following statements is true for the currents in a parallel RL circuit?
A.	The total current is equal to the sum of the currents through the resistance and inductance
B.	The current always has the same amplitude and phase for every part of the circuit
C.	The total current is less than the sum of the currents through the resistance and inductance
D.	The total current leads the total voltage by less than 90
Answer» D. The total current leads the total voltage by less than 90

Discussion

130.	A device that converts chemical energy to electrical energy is called a:
A.	solar cell
B.	thermocouple
C.	chemical cell
D.	electric device
Answer» D. electric device

Discussion

131.	Doubling the number of turns of wire in an inductor:
A.	reduces the value of inductance by one-half
B.	multiplies the value of inductance by two
C.	multiplies the value of inductance by four
D.	reduces the value of inductance by one-fourth
Answer» D. reduces the value of inductance by one-fourth

Discussion

132.	Which one of the following statements is true for voltage in a parallel circuit?
A.	The total voltage in a parallel circuit is equal to the average value of the individual voltages
B.	The total voltage in a parallel circuit is always less than the value of the smallest voltage
C.	The total voltage is equal to the sum of the voltages across the individual branches in a parallel circuit
D.	The total voltage of a parallel circuit is the same as the voltages across each branch
Answer» E.

Discussion

133.	Doubling the operating voltage of a purely capacitive circuit:
A.	has no effect on the capacitive reactance
B.	doubles the amount of capacitive reactance
C.	multiplies the capacitive reactance by 7
D.	cuts the capacitive reactance in half
Answer» B. doubles the amount of capacitive reactance

Discussion

134.	Doubling the operating frequency of a purely inductive circuit:
A.	doubles the amount of current through the inductors
B.	has no effect on the current through the inductors
C.	cuts the current through the inductors one-half
D.	increases the current, but by an amount that can be determined only by doing a complete analysis of the circuit
Answer» D. increases the current, but by an amount that can be determined only by doing a complete analysis of the circuit

Discussion

135.	Which one of the following statements is true for the currents in a parallel RC circuit?
A.	The total current is equal to the sum of the currents for the resistance and capacitance
B.	The current always has the same amplitude and phase for every part of the circuit
C.	The total current is less than the sum of the currents for the resistance and capacitance
D.	The total current. is greater than the sum of the currents for the resistance and capacitance
Answer» B. The current always has the same amplitude and phase for every part of the circuit

Discussion

136.	Which one of. the following phrases most accurately describes the nature of a pulsating dc voltage?
A.	The voltage remains at one polarity and at a steady level
B.	The voltage remains at one polarity but changes value periodically
C.	The voltage causes current to flow in two directions at the same time
D.	The voltage reverses polarity periodically
Answer» C. The voltage causes current to flow in two directions at the same time

Discussion

137.	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?
A.	R = E2/P
B.	P = PR
C.	P = E2/R
D.	I = P/E
Answer» B. P = PR

Discussion

138.	One henry of inductance is defined as:
A.	the amount of counter emf required to reduce a current to 1 A
B.	the amount of inductance required for generating 1 V of counter emf when the current changes at the rate of 1 A per second
C.	the amount of inductance required to change the frequency of a current by 1 Hz
D.	the number of turns of wire in an inductor multiplied by the amount of current flowing through it
Answer» C. the amount of inductance required to change the frequency of a current by 1 Hz

Discussion

139.	Which one of the following statements is true for the currents in a series RC circuit?
A.	The current always has the same amplitude and phase for every part of the circuit
B.	The total current is equal to the sum of the currents for the resistance and capacitance
C.	The total current is greater than the sum of the currents for the resistance and capacitance
D.	The total current is less than the sum of the currents for the resistance and capacitance
Answer» B. The total current is equal to the sum of the currents for the resistance and capacitance

Discussion

140.	When the collector current increases, what does the current gain do?
A.	decreases
B.	stays the same
C.	increases
D.	any of the above
Answer» D. any of the above

Discussion

141.	The value of a capacitor can be made larger by:
A.	increasing the area of the plates
B.	decreasing the area of the plates
C.	increasing the frequency of the applied voltage
D.	increasing the voltage applied to the plates
Answer» B. decreasing the area of the plates

Discussion

142.	A farad is defined as the amount of capacitance necessary for:
A.	dissipating 1 W of power
B.	causing an ac phase shift greater than 90 degree
C.	storing 1 V for 1 second
D.	changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing
Answer» E.

Discussion

143.	Waveforms are graphs that show:
A.	frequency on the vertical axis and amplitude on the horizontal axis
B.	amplitude on the vertical axis and frequency on the horizontal axis
C.	amplitude on the vertical axis and the passage of time on the horizontal axis
D.	the passage of time on the vertical axis and amplitude on the horizontal axis
Answer» D. the passage of time on the vertical axis and amplitude on the horizontal axis

Discussion

144.	Which one of the following principles best describes the basic operation of a generator?
A.	Like magnetic poles repel; unlike poles attract
B.	Current is induced in a conductor that is moving through a magnetic field
C.	Like magnetic poles attract; unlike poles repel
D.	Current flowing through a conductor generates a magnetic field
Answer» C. Like magnetic poles attract; unlike poles repel

Discussion

145.	A high-pass filter:
A.	passes lower-frequency signals and reduces higher-frequency signals
B.	passes higher-frequency signals and reduces lower-frequency signals
C.	has no effect on ac signals
D.	increases the level of all frequencies by a significant amount
Answer» C. has no effect on ac signals

Discussion

146.	In a pure inductor:
A.	ac current leads the voltage by 90 degree
B.	ac current and voltage are exactly in phase
C.	ac current lags the voltage by 90 degree
D.	ac current is converted to dc voltage
Answer» D. ac current is converted to dc voltage

Discussion

147.	Which one of the following statements is true for the impedance of a series RC circuit?
A.	The impedance is greater than the sum of the resistance and capacitive reactance
B.	The impedance is equal to the sum of the resistance and capacitive reactance
C.	The impedance is greater than either the resistance or capacitive reactance but less than their sum
D.	The impedance is less than the sum of the resistance and capacitive reactance
Answer» D. The impedance is less than the sum of the resistance and capacitive reactance

Discussion

148.	A zener regulator has an input voltage from 15 to 20 V and a load current from 5 to 20 mA. If the zener voltage is 6.8 V, what value should the series resistor have?
A.	310 Ohm
B.	400 Ohm
C.	410 Ohm
D.	550 Ohm
Answer» D. 550 Ohm

Discussion

149.	A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current?
A.	7.8 mA
B.	208 mA
C.	200 mA
D.	300 mA
Answer» C. 200 mA

Discussion

150.	What is the smallest number of polarities required for current flow?
A.	One - a negative terminal
B.	Two - a negative terminal and a positive terminal
C.	Three - negative, positive and neutral terminals
D.	Four - two negative and two positive
Answer» C. Three - negative, positive and neutral terminals

Discussion

Explore topic-wise MCQs in Computer Science.

Who invented the first junction transistor?

If the current gain is 200 and the collector current is 100 mA, the base current is

Current is

A typical light switch in your home is a:

Silicon atoms combine into an orderly pattern called a

The Thevenin resistance is equal in value to the

The saturation point is approximately the same as

The barrier potential accross each depletion layer is

How much current flows through a 60-W light bulb that is operating at 120 V?

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

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

The Norton current is sometimes called the

At room temperature a conductor has low many holes?

Most AC power is obtained from:

Determine the resistance value and tolerance of a resistor that has the following color bands; first band is red, second band is red, third band is orange, and the fourth band is gold

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

Electron current is flowing through a conductor in a direction you might describe as straight into this page. What is the direction of the resulting magnetic field?

Which one of the following equations most directly determines the amount of current flowing through a resistor when you know the value of the resistor and the voltage drop across it?

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

A loadstone is:

Which one of the following is most likely used for measuring the rate of electron flow?

A zener diode has a voltage of 10 V and a current of 20 mA. What is the power dissipation?

Suppose a step-down transformer has a turns ration of 5:1. If the secondary current is 1A rms, what is the primary-current?

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

What is the turns ratio of a power transformer that shows 50 V at its secondary winding when you apply 150 V to its primary winding?

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

Doubling the operating frequency of a capacitive circuit:

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

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

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

Doubling the number of turns of wire in an inductor:

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

Doubling the operating voltage of a purely capacitive circuit:

Doubling the operating frequency of a purely inductive circuit:

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

Which one of. the following phrases most accurately describes the nature of a pulsating dc voltage?

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?

One henry of inductance is defined as:

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

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

The value of a capacitor can be made larger by:

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

Waveforms are graphs that show:

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

A high-pass filter:

In a pure inductor:

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

A zener regulator has an input voltage from 15 to 20 V and a load current from 5 to 20 mA. If the zener voltage is 6.8 V, what value should the series resistor have?

A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current?

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