LU 6 Alternating Current (6.4 & 6.5)

Power factor in an AC circuit is defined as the ratio of apparent power to the real power

• True

• False

• I don't know the answer

What is the power factor in an AC circuit having true power 800 watts and apparent power 1000 watts?

• 0.60

• 0.85

• 0.80

• 1.25

In RCL series circuit, tan ∅ is positive when...

• the inductive reactance is zero

• the inductive reactance is equal to capacitive reactance

• the inductive reactance is greater than capacitive reactance

• the inductive reactance is less than capacitive reactance

In RCL series phasor, we start drawing the phasor from which quantity?

• Voltage

• Impedance

• Resistance

• Current

In RCL series circuit, the power factor is always...

• Positive

• Zero

• Negative

• Depends on the circuit

Bridge rectifier is an alternative for...

• Full wave rectifier

• Peak rectifier

• Half wave rectifier

• Off-peak rectifier

How to overcome a simple diode rectifier that has ‘ripples’ in the output wave?

• Connect an inductor in series to the load resistance

• Connect an inductor in parallel to the load resistance

• Connect a capacitor in series to the load resistance

• Connect a capacitor in parallel to the load resistance

A half wave rectifier has a Ripple factor value greater than that of a full wave rectifier.

• True

• False

• I don't know the answer