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WorksheetsICE ELECS 1 (Electrical Engineering)_ SEERS April 2023 F2F Canva
Total questions: 88
Worksheet time: 44mins
A thermistor is a type of
power supply
battery
switch
resistor
A circuit breaker is a
resettable protective device
fuse
switch
resistor
A wiper is the sliding contact in a
thermistor
photoconductive cell
potentiometer
switch
Which of the following is not an electrical quantity?
distance
voltage
current
power
The colored bands for a 4,700 ohm resistor with a ten percent tolerance are
yellow, violet, red, silver
orange, violet, red, silver
yellow, violet, red, gold
yellow, violet, orange, gold
A two-terminal variable resistor is known as a
rheostat
potentiometer
thermistor
wiper
The minimum resistance value for a blue, gray, red, silver resistor is
612Ω
6,120Ω
6,800Ω
6,460Ω
The number of megaohms in 0.03 kilohms is
either 0.00002 MΩ or 0.0002 MΩ
0.0002 MΩ
3 × 10–5 MΩ
0.00002 MΩ
You are measuring the current in a circuit that is operated on an 18 V battery. The ammeter reads 40 mA. Later you notice the current has dropped to 20 mA. How much has the voltage changed?
0 V
9 V
18 V
900 mV
A string of five series resistors is connected across a 6 V battery. Zero voltage is measured across all resistors except R3. The voltage across R3 is
6 V
0.6 V
0 V
1.2 V
In a certain five-step R/2R ladder network, the smallest resistor value is 1 kΩ. The largest value is
indeterminable
10 kΩ
2 kΩ
20 kΩ
Four amperes of current are measured through a 24Ω resistor connected across a voltage source. How much voltage does the source produce?
960 V
9.6 V
8 V
96 V
The branch current method uses
Kirchhoff's current law and Ohm's law
the superposition theorem and Thevenin's theorem
Kirchhoff's voltage and current laws
Thevenin's theorem and Ohm's law
The power rating of a carbon-composition resistor that is to handle up to 1.2 W should be
0.5 W
5 W
1 W
2 W
In assigning the direction of branch currents,
the directions are not critical
they must point into a node
they must point out of a node
the directions are critical
The current in a given circuit is not to exceed 24 A. Which value of fuse is best?
20 A
a fuse is not necessary
10 A
24 A
What is the voltage drop across R1?
850 mV
9.18 V
7.82 V
918 mV
For a given wirewound core, an increase in current through the coil
increases the flux density
causes no change in flux density
decreases the flux density
reverses the flux lines
Eight-tenths coulomb passes a point in 4 s. The current in amperes is
0.2 A
1.6 A
16 A
2 A
What is the current through R2?
1.73 A
173 mA
319 mA
A resistor is connected across a 50 V source. What is the current in the resistor if the color code is red, orange, orange, silver?
2.2 mA
2 mA
21.4 mA
214 mA
Find the node voltage VA.
5.18 V
9.56 V
956 m
518 mv
What is the voltage drop across R2?
1.5 V
3.5 V
145 mV
4.18 V
When the pointer of an analog ohmmeter reads close to zero, the resistor being measured is
overheated
shorted
reversed
open
An electromagnetic field exists only when there is
an increasing current
voltage
current
decreasing current
A 120V lamp-dimming circuit is controlled by a rheostat and protected from excessive current by a 3A fuse. To what minimum resistance value can the rheostat be set without blowing the fuse? Lamp resistance is 20 ohms.
40Ω
4Ω
20Ω
2Ω
A certain appliance uses 350 W. If it is allowed to run continuously for 24 days, how many kilowatt-hours of energy does it consume?
201.6 kWh
2.01 kWh
8.4 kWh
20.16 kWh
Find the Norton circuit, that is, IIN and RN, for the circuit given below.
478 mA, 6.8Ω
478 mA, 12.8Ω
750 mA, 6.8Ω
750 mA, 12.8Ω
To measure the current of the second resistor in a circuit of four resistors, an ammeter can be placed
at any point in the circuit
between the second and third resistors
at the negative terminal of the source
between the third and fourth resistors
The unit for reluctance is
At/m
tesla
Wb
At/Wb
The ability of a material to remain magnetized after removal of the magnetizing force is known as
hysteresis
reluctance
retentivity
permeability
If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage
reverses polarity
increases
decreases
remains unchanged
When load resistance is removed from the output of voltage divider circuit, current drawn from the source
remains the same
is cut off
decreases
increases
Five resistors are connected in a series and there is a current of 3 A into the first resistor. The amount of current into the second resistor is
1 A
0.3 A
3 A
On which of the following voltage range settings will a voltmeter present the minimum load on a circuit?
1,000 V
500 V
50 V
1 V
When one of three series resistors is removed from a circuit and the circuit is reconnected, the current
increases by one-third
increases
decreases by one-third
decreases by the amount of current through the removed resistor
The voltage and current for the load resistor, RL, of the circuit is
450 mV, 4.5 mA
4.50 V, 4.5 mA
4.50 V, 45 mA
450 mV, 45 mA
Three lights are connected in parallel across a 120 volt source. If one light burns out,
the remaining two will glow dimmer
the remaining two will glow with the same brightness as before
the remaining two will glow brighter
the remaining two will not light
A basic one-loop dc generator is rotated at 90 rev/s. How many times each second does the dc output voltage peak (reach maximum)?
180
360
270
90
What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it?
300 At
30 At
187 At
18.75 At
One sine wave has a positive-going zero crossing at 15° and another sine wave has a positive-going zero crossing at 55°. The phase angle between the two waveforms is
40°
none of the above
0°
45°
A sudden increase in the total current into a parallel circuit may indicate
an increase in source voltage
an open resistor
a drop in source voltage
either a drop in source voltage or an open resistor
The output of a certain voltage divider is 12 V with no load. When a load is connected, the output voltage
becomes zero
remains the same
increases
decreases
A sawtooth wave has a period of 10 ms. Its frequency is
50 Hz
10 Hz
1,000 Hz
100 Hz
A sinusoidal current has an rms value of 14 mA. The peak-to-peak value is
22.6 mA
16 mA
45.12 mA
39.6 mA
In a certain three-branch parallel circuit, R1 has 12 mA through it, R2 has 15 mA through it, and R3 has 25 mA through it. After measuring a total of 27 mA, you can say that
R1 is open
the circuit is operating properly
R2 is open
R3 is open
In a five-branch parallel circuit, there are 12 mA of current in each branch. If one of the branches opens, the current in each of the other four branches is
48 mA
12 mA
15 mA
0 A
A sawtooth wave has a period of 10 ms. Its frequency is
50 Hz
10 Hz
1,000 Hz
100 Hz
A capacitor and a resistor are connected in series to a sine wave generator. The frequency is set so that the capacitive reactance is equal to the resistance and, thus, an equal amount of voltage appears across each component. If the frequency is increased
VR and VC = 0
VR > VC
VR = VC
VC > VR
Six resistors are in parallel. The two lowest-value resistors are both 1.2 kΩ. The total resistance
is less than 6 kΩ
is less than 600Ω
is greater than 1.2 kΩ
is less than 1.2 kΩ
What is the Thevenin equivalent (VTH and RTH) for the circuit given?
6.4 V, 422
6.4 V, 560
6.4 V, 680
30 V, 422
When the plate area of a capacitor increases
the capacitance is unaffected
the voltage it can withstand increases.
the capacitance increases
the capacitance decreases
If the rms current through a 4.7 k resistor is 4 mA, the peak voltage drop across the resistor is
26.6 V
4 V
2.66 V
18.8 V
A square wave has a period of 60us. The first odd harmonic is
33.33 kHz
5 kHz
50 kHz
500 kHz
Of the following capacitors, which one has the highest dielectric constant?
air
paper
mica
glass
When the current through an inductor decreases, the amount of energy stored in the electromagnetic field
remains the same
doubles
decreases
increases
A 330 pF capacitor and a 220 pF capacitor are each connected across a 6 V dc source. The voltage across the 330 pF capacitor is
4 V
3 V
6 V
0 V
The winding resistance of a coil can be increased by
increasing the number of turns
increasing the number of turns or using thinner wire
using a thinner wire
changing the core material
A sine wave of 15 kHz is changing at a faster rate than a sine wave with a frequency of
12 kHz
1.3 MHz
25 kHz
18 kHz
A 120 V voltage source has a source resistance, RS, of 60Ω. The equivalent current source is
200 mA
400 mA
4 A
2A
A certain voltage divider consists of two 12 kΩ resistors in series. Which of the following load resistors will have the most effect on the output voltage?
24 kΩ
18 kΩ
1 MΩ
12 kΩ
Four 8Ω speakers are connected in parallel to the output of an audio amplifier. If the maximum voltage to the speakers is 12 V, the amplifier must be able to deliver to the speakers
18 W
72 W
48 W
1.5 W
Which of the following series combinations dissipates the most power when connected across a 120 V source?
one 220Ω resistor
four 220Ω resistors
three 220Ω resistors
two 220Ω resistors
A certain Wheatstone bridge has the following resistor values: R1 = 10 kΩ, R2 = 720Ω , and R4 = 2.4 kΩ. The unknown resistance is
24Ω
3000Ω
300Ω
2.4Ω
A 12 mA current source has an internal resistance, RS, of 1.2 kΩ. The equivalent voltage source is
144 V
14.4 V
7.2 V
72 mV
A voltage divider consists of two 100 kΩ resistors and a 12 V source. What will the output voltage be if a load resistor of 1 MΩ is connected to the output?
6 V
0.57 V
5.7 V
12 V
An uncharged capacitor and a 1 k resistor are connected in series with a switch and a 6 V battery. At the instant the switch is closed, the voltage across the capacitor is
0 V
3 V
2 V
6 V
An ammeter has an internal resistance of 50Ω. The meter movement itself can handle up to 1 mA. If 10 mA is applied to the meter, the shunt resistor, RSH1, is approximately
50Ω
5.5Ω
9Ω
55Ω
Four 0.15 uF capacitors are in parallel. The total capacitance is
0.15 uF
0.8 uF
0.6 uF
0.30 uF
A waveform has a baseline of 3 V, a duty cycle of 20%, and an amplitude of 8 V. The average voltage value is
4 V
1.6 V
11 V
4.6 V
When the current through an inductor is cut in half, the amount of energy stored in the electromagnetic field
does not change
doubles
quadruples
is quartered
120Ω resistor must carry a maximum current of 25 mA. Its rating should be at least
480 mW
150 mW
15 mW
4.8 W
A 2 mH, a 3.3 mH, and a 0.2 mH inductor are connected in series. The total inductance is
5.5 mH
55 mH
less than 0.2 mH
less than 5.5 mH
A 2Ω RL is connected across a voltage source, VS, of 110 V. The source's internal resistance is 24Ω. What is the output voltage across the load?
8.5 V
110 V
0 V
85 V
To step 110 V ac down to 20 V ac, the turns ratio must be
0.18
5.5
18
0.018
In a certain loaded transformer, the secondary voltage is one-fourth the primary voltage. The secondary current is
four times the primary current
equal to the primary current
one-fourth the primary current
one-fourth the primary current and equal to the primary current
A 12 kΩ resistor, a 15 kΩ resistor, and a 22 kΩ resistor are in series with two 10 kΩ resistors that are in parallel. The source voltage is 75 V. Current through the 15 kΩ resistor is approximately
50 mA
1.4 mA
14 mA
5 mA
Four resistors are connected in parallel. Fifteen mA flows through resistor R. If the second resistor is 2R, the third resistor 3R, and the fourth resistor 4R, the total current in the circuit is
15 mA
135 mA
60 mA
31.25 mA
A 220Ω resistor is in series with a 2.2 uF capacitor. The time constant is
480 us
48 us
24 us
2.42 us
Determine IN for the circuit consisting of VS, R1, R2, and R3 shown in the given circuit.
676 mA
75 mA
431 mA
245 mA
Using the mesh current method, find the branch current, IR1, in the above figure.
12.5 A
115 mA
135 mA
12.5 mA
Two resistors are in series: a 5.6 kΩ resistor and a 4.7 kΩ resistor. The voltage drop across the 5.6 kΩ resistor is 10 V. The voltage across the 4.7 kΩ resistor is
10 V
0 V
2.32 V
8.39 V
When the turns ratio of a transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is
12 V
240 V
120 V
2,400 V
Find the Thevenin equivalent (VTH and RTH) between terminals A and B of the circuit given.
41.67 V, 70Ω
41.6 V, 120Ω
4.16 V, 70Ω
4.16 V, 120Ω
The voltage across a coil when di/dt = 20 mA/us and L = 8 uH is
16 mV
1.6 mV
160 mV
2.5 mV
A sine wave voltage is applied across a capacitor. If the frequency of the voltage is decreased, the current
increases
decreases
remains constant
ceases
If 25 W of power are applied to the primary of an ideal transformer with a turns ratio of 10, the power delivered to the secondary load is
250 W
0 W
25 W
2.5 W
A certain series circuit consists of a 1/8 W resistor, a 1/4 W resistor, and a 1/2 W resistor. The total resistance is 1200Ω. If each resistor is operating at its maximum power dissipation, total current flow is
19 mA
190 mA
27 mA
2.7 mA
