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Quiz 5
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Q.1
What is the impedance of a circuit composed of a 100 ohm resistor connected in parallel with a capacitor that has a reactance of 100 ohm?
60 Ohm
99.3 Ohm
250 Ohm
70.7Ohm
None of the above
Q.2
Suppose the voltage from a power outlet is 120 Vrms. What is the peak voltage?
100 V
120 V
170 V
180 V
None of the above
Q.3
Which one of the following statements is true?
Power dissipation of a pure capacitor increases with operating frequency
Power dissipation of a pure capacitor decreases with operating frequency
There is no meaningful relationship between the power dissipation of a pure capacitor and its operating frequency
All of the above
None of the above
Q.4
A power transformer steps 100 V down to 10 V. If the current in its primary winding is 2 A, what is the current in the secondary winding?
50 A
12:00 AM
5:00 AM
20 A
None of the above
Q.5
Current can flow through a normally open push button switch as long as:
you are pressing the button
you are not pressing the button
its contact remain open
its contact remain open
None of the above
Q.6
Doubling the operating frequency of a purely capacitive circuit:
has no effect on the total circuit current
doubles the amount of total current
cuts the total current by one-half
thrice the amount of total current
None of the above
Q.7
A device that converts thermal energy to electrical energy is called a:
thermocouple
solar cell
chemical cell
piezoelectric devices
None of the above
Q.8
How much power is being dissipated by a 1000 W resistance that has 25 V applied to it?
0.24 W
0.625 W
80 W
325 kW
None of the above
Q.9
How much current flows through a 0.02 micro F capacitor that is operating from a 12-V ac, 100-Hz source?
0.151 mA
157 raA
0.995 mA
2.02 A
None of the above
Q.10
An unloaded zener regulator has a source voltage of 20 V, a series resistance of 330 W, and a zener voltage of 12 V, What is the Zener current?
28.4 mA
24.2 mA
34.4 mA
68.4 mA
None of the above
Q.11
What is the impedance of a circuit composed of a 100 ohm resistor connected in parallel with an inductor that has a reactance of 200 W?
77.7 ohm
89.3 ohm
88.8 ohm
224 ohm
None of the above
Q.12
The nucleus of the copper atom contains how many protons?
1
4
18
29
None of the above
Q.13
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.14
If a transistor operates at the middle of the load line, an increase in the current gain will move the Q point
down
up
nowhere
off the load line
None of the above
Q.15
Which one of the following statements is true for the voltages in a series RL circuit?
The total voltages 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 less than the sum of the voltages across the resistance and inductance
The total voltage lags the total current by less than 90
None of the above
Q.16
The core of an electromagnet is said to be in saturation when:
the core is permitted to move freely within the coil
an increase in current through the coil causes no further increase in the mmf
frequent changes in the direction of current through the coil causes heating effects in the core material
changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
None of the above
Q.17
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 = I
2
R
P = IE
P = E
2
/R
I = P/E
None of the above
Q.18
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.19
Which one of the following statements is true for voltage in a series circuit?
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
None of the above
Q.20
A basic capacitor is composed of:
two conductors separated by a dielectric
two dielectrics separated by a conductor
two coils separated by a dielectric
two coils separated by a conductor
None of the above
Q.21
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?
01-Apr
01-Mar
2
3
None of the above
Q.22
What is the inductive reactance of a 0.1-H coil that is operating at 1000 Hz?
100 Ohm
Less than 1 Ohm
628 Ohm
444 Ohm
None of the above
Q.23
As the temperature increases, the current gain
increases
decreases
contant
can be any of the above
None of the above
Q.24
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?
E = PR
E = I
2
R
I = E/R
I = ER
None of the above
Q.25
Suppose a current source has an Ideal current of 10 mA and an internal resistance of 20 MW. For what values of load resistance will the current source appear stiff?
20 k Ohm or more
200 k Ohm or less
200 k Ohm or more
20 km or less
None of the above
Q.26
Which one of the following devices is most often used for measuring electrical potential difference?
Voltmeter
Ohmmeter
Ammeter
Wattmeter
None of the above
Q.27
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.28
A resistor has a rated value of 100 ohm 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.29
Which one of the following is a statement of KirchhofFs voltage law?
The total voltage in a parallel circuit is less than the value of the smallest voltage
The algebraic sum of voltages in a loop is equal to zero
The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it
The algebraic sum of voltages entering and leaving a point is equal to zero
None of the above
Q.30
Assuming 100% efficiency, what is the power being consumed at the secondary winding of the transformer described in question 91?
200 W
1000 W
20 W
100 W
None of the above
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