Alternating and Direct Current

DIRECT CURRENT is an electric current which flows ___ at ___ value over a period of time.

• in one direction, constant

• in one direction, varying

• back and forth, constant

• back and forth, varying

ALTERNATING CURRENT is an electric current which flows ___ at ___ value over a period of time.

• in one direction, constant

• in one direction, varying

• back and forth, constant

• back and forth, varying

Which of the following are types of DIRECT currents and voltages?

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Which of the following are types of ALTERNATING currents and voltages?

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Pulsating Direct Current is produced by converting an AC voltage into a DC voltage by means of ___ circuit.

• inductor

• diode

• rectifier

• capacitor

Three-Phase AC voltages are generated when 3 sets of coil of wires are rotated and cuts a magnetic field. These 3 voltages are displaced by ___ from each other.

• 30 degrees

• 120 degrees

• 180 degrees

• 360 degrees

In AC 3-phase 4-wire system, what is the voltage between phase to phase?

• 550V

• 440V

• 230V

• 110V

In AC 3-phase 4-wire system, what is the voltage between phase to neutral?

• 550V

• 440V

• 230V

• 110V

Measuring the current in D.C. circuits:

The ammeter is connected in ___with the resistor, and in ___ polarity with respect to the supplied DC voltage.

• series, the same

• parallel, the same

• series, any

• parallel, any

Measuring the voltage in A.C. circuits:

The voltmeter is connected in ___ with the resistor, and at ___ polarity with respect to the supplied AC voltage.

• series, the same

• parallel, the same

• series, any

• parallel, any