Module 26201-23 Practice Exam

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