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WorksheetsModule 26201-23 Practice Exam
Total questions: 20
Worksheet time: 10mins
An electric current always produces _____.
capacitive reactance
a magnetic field
mutual inductance
high voltage
What is the peak voltage in a circuit with an rms voltage of 120VAC?
150V
170V
117V
120V
Which of the following conditions exists in a circuit of pure resistance?
The voltage and current are 180° out of phase.
The voltage and current are 270° out of phase.
The voltage and current are 90° out of phase.
The voltage and current are in phase.
The number of cycles a waveform completes per second determines the _____.
voltage
frequency
resistance
amperage
In a purely resistive AC circuit where 240V is applied across a 10Ω resistor, the amperage is _____.
120A
10A
24A
60A
Which of the following coils is likely to show the lowest inductance?
A coil with a short core
A coil with a magnetic core
A coil with many turns
A coil with a narrow diameter
Which of the following conditions exists in a circuit of pure inductance?
The voltage and current are 180° out of phase.
The voltage and current are 90° out of phase.
The voltage and current are 120° out of phase.
The voltage and current are in phase.
When the current increases in an AC circuit, what role does inductance play?
It reduces the current.
It increases the current.
It causes the overcurrent protection to open.
It plays no role at all.
Reactance increases with an increase in _____.
resistance
magnetism
capacitance
inductance
The true power in a circuit with a current of 4A that passes through a 50Ω resistor is _____.
200W
800W
600W
400W
Capacitance is measured in _____.
amperes
henrys
joules
farads
The total opposition to current flow in an AC circuit is known as _____.
resistance
impedance
capacitive reactance
inductive reactance
A power factor is not an angular measure, but a numerical ratio with a value between 0 and 1, equal to the _____.
tangent of the phase angle
sine of the phase angle
cotangent of the phase angle
cosine of the phase angle
The total capacitance of two 15μF capacitors connected in parallel is _____.
5μF
10μF
15μF
30μF
The two windings of a conventional transformer are known as the _____.
high voltage winding and low voltage winding
primary winding and secondary winding
mutual winding and inductive winding
step-up winding and step-down winding
The total capacitance of two 5μF capacitors and one 10μF capacitor connected in parallel is _____.
5μF
20μF
15μF
25μF
A transformer with 10 turns in the primary and two turns in the secondary has a turns ratio of _____.
8:1
10:1
20:1
5:1
The power factor in a circuit with a resistance of 50Ω and an impedance of 100Ω is _____.
0.5
0.25
0.75
1.0
The opposition to current flow offered by the capacitance of a circuit is known as _____.
mutual inductance
inductive reactance
capacitive reactance
pure resistance
The total capacitance of two 15μF capacitors connected in series is _____.
5μF
7.5μF
30μF
15μF
