Correct Answer:

�� To ensure the neutral current is zero

Question 1
	What is the reason for balancing the load across the three phases

Correct Answer:

�� IL

��Question 2
	In an RL Parallel circuit what is the lagging component

Correct Answer:

�� Fit p.f. correction capacitors across the load

��Question 3
	What can be done to improve the power factor of an industrial installation

Correct Answer:

�� 3488.37 VA

��Question 4
	If the true power is 3kW and the power factor is 0.86 what is the apparent power.

Correct Answer:

�� 48.81 degrees

��Question 5
	If R=7 ohms�and Xc=8 ohms what is the phase angle

Correct Answer:

�� 0.919

��Question 6
	If the phase angle is 23.185 degrees what is the power factor

Correct Answer:

�� 106.10 ohms

��Question 7
	What is the Ohmic value (or capacitive reactance) of a 30 micro Farad Capacitor

Correct Answer:

�� 25 kVAr

��Question 8
	If the apparent power is 50 kVA and the phase angle is 30 degrees what is the value of the reactive component

Correct Answer:

�� IL=Ip

��Question 9
	In a star connected system what is the relationship between Line Current and Phase Current

Correct Answer:

�� 45 degrees

��Question 10
	If the true power was 500 watts and the apparent power was 707.106 VA what would the phase angle be

Correct Answer:

�� V (Volts)

��Question 11
	In an RLC Parallel circuit which quantitiy remains constant

Correct Answer:

�� VL

��Question 12
	In an RL Series circuit what is the lagging component
		Feedback: In an RL Series circuit what is the lagging component

Correct Answer:

�� 0.636

��Question 13
	If R=7 and Z=11 what is the power factor

Correct Answer:

�� Ohms

��Question 14	0 of 1 points �
	What does the ratio W/VA produce:

Correct Answer:

�� To improve the power factor

��Question 15
	What is the purpose of the capacitor across the terminals of a fluorescent fitting used for:

Correct Answer:

�� 0.707

��Question 16
	If the true power was 500 watts and the apparent power was 707.106 VA what would the power factor be

Correct Answer:

�� Unity

��Question 17
	When W=VA what is the p.f

Correct Answer:

�� 1390 micro farads

��Question 18
	An RL circuit connected to a 50Hz supply consists of a 5 ohm resistor in series with an inductor of� 7.29mH. What size capacitor would you need to connect across the supply to correct the phase shift

Correct Answer:

�� VA (Volt Amps)

��Question 19
	On a power triangle what does the hypotenuse represent:

Correct Answer:

�� 120

��Question 20
	By how many degrees are the three phases separated

Correct Answer:

�� One third the power (p/3)

��Question 21
	What is the relationship between the power dissipated in a star connected system to that of a delta connected system

Correct Answer:

�� IL>Ip

��Question 22
	In a delta connected system what is the relationship between Line Current and Phase Current

Correct Answer:

�� 9.42 ohms

��Question 23
	What is the Ohmic value (or inductive reactance) of a 30 milli Henry (30mH) inductor

Correct Answer:

�� 1

��Question 24
	When R=Z what is the p.f

Correct Answer:

�� Z

��Question 25
	On an impedance triangle what does the hypotenuse represent:

Correct Answer:

�� 54.31 degrees

��Question 26
	If R=7 and Z=12 what is the phase angle

Correct Answer:

�� PowerFactor

��Question 27
	What does the ratio of R/Z produce:

Correct Answer:

�� XL = 2.29�ohms, p.f. = 0.909,�phase angle = 24.59 degrees

��Question 28
	An RL circuit connected to a 50Hz supply consists of a 5 ohm resistor in series with an inductor of� 7.29mH. What is the Ohmic value of the inductor, The power factor and the phase angle

Correct Answer:

�� 7.3mH

��Question 29
	In a series RL circuit�the value of R is 4 ohms and the phase angle is 30 degrees what is the� value of the inductor

Correct Answer:

�� I (Amps)

��Question 30
	In an RLC Series circuit which quantity remains constant

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