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Quiz 7
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Q.1
A loadstone is:
a natural magnet
a temporary magnet
an artificial magnet
a paramagnetic alloy
None of the above
Q.2
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.3
Which one of the following statements regarding ac circuits is correct?
Current and voltages are in phase through a resistor
Current leads the voltage through a resistor
Current lags the voltage through a resistor
All of the above
None of the above
Q.4
Which one of the following statements most accurately describes the nature of inductive reactance?
Inductive reactance is an opposition to current flow in dc circuits
Inductive reactance is an opposition to current flow in ac circuits
Inductive reactance is another term for counter emf
Inductive reactance is a force that tends to overcome the effects of counter emf
None of the above
Q.5
Reducing the amount of current through an inductor:
reduces the value of inductance by one-half
multiplies the value of inductance by four
multiplies the value of inductance by two
has no effect on the inductance
None of the above
Q.6
What is the power dissipation of a resistance that has 24 V dropped across it and 0.25 A flowing through it?
3 W
6 W
64 W
122 W
None of the above
Q.7
Which one of the following kinds of materials has the highest permeability?
A diamagnetic material
A ferromagnetic material
A paramagnetic material
All of the above
None of the above
Q.8
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.9
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 = E
2
/R
P = I
2
R
I = P/E
None of the above
Q.10
Suppose a voltage source has an ideal voltage of 15V and a source resistance of 0.2W. For what values of load resistance will the voltage source appear stiff?
20 Ohm
30 Ohm
10 Ohm
100 Ohm
None of the above
Q.11
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.12
What are the main parts of an atom?
Protons only
Electrons, protons, and ions
Electrons, ions, and neutrons
Electrons, protons, and neutrons
None of the above
Q.13
Current is
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
None of the above
Q.14
A real voltage source has
Zero internal resistance
Infinite internal resistance
A small internal resistance
A large internal resistance
None of the above
Q.15
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.16
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.17
Inductive reactance is measured in units of:
volts per second
amperes per second
Ohm
henrys
None of the above
Q.18
What is the difference between the kinds of charges for an electron and a proton?
An electron has a positive charge and a proton has no charge
An electron has a positive charge and a proton has a negative charge
An electron has a negative charge and a proton has a positive charge
An electron has a negative charge and a proton has no charge
None of the above
Q.19
If N1/N2 = 2, and the primary voltage is 120 V, what is the secondary voltage?
0 V
36 V
40 V
60 V
None of the above
Q.20
A device that converts light energy to electrical energy is called a:
thermocouple
solar cell
photodiode
photo transistor
None of the above
Q.21
How much current flows through a 60-W light bulb that is operating at 120 V?
0.5A
180 A
2:00 AM
7200 A
None of the above
Q.22
What is the inductive reactance of a 2-H coil operating at 60 Hz?
754 Ohm
30 Ohm
60 Ohm
120 Ohm
None of the above
Q.23
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.24
An ideal voltage source has
Zero internal resistance
Infinite internal resistance
A load dependent voltage
A load-dependent current
None of the above
Q.25
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
Q.26
Absolute Zero temperature equals
0
o
C
-273
o
C
-276
o
C
25
o
C
None of the above
Q.27
At cut off, the Q point is at
upper end of the load line
middle of the load line
lower end of the load line
infinity
None of the above
Q.28
The south pole of a magnet is the one:
that would be attracted to the earths north magnetic pole
that has its molecules arranged in a random pattern
that would be attracted to the earth's south magnetic pole
that would be repelled by the north pole of another magnet
None of the above
Q.29
Which one of the following statements is true?
Capacitive reactance is at a minimum for dc source voltages
Capacitive reactance decreases as the operating frequency increases
There is no meaningful relationship between capacitive reactance and operating frequency
Capacitive reactance increases as the operating frequency increases
None of the above
Q.30
The peak value of a sine waveform is:
the amplitude at 70.7% of the maximum value
the amplitude at 90% of the maximum value
the amplitude at 1.41 times the maximum value
the maximum positive or negative value
None of the above
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