Lesson 19

Question 1

The impedence of a parallel RL circuit is always_______ than the resistance or reactance of any one branch.

Answer 1

Less

Question 2

The_______power can be computed by multiplying the line voltage by the line current

Answer 2

Apparent

Question 3

The power factor (PF) in an RL parallel circuit is the ratio of ______ to ______

Answer 3

Watts/VA

Question 4

A circuit has an applied voltage of 240 volts and draws 5 amperes. The power factor is 70%. A) what is the apparent power?
B) what is the true power?

Answer 4

A) 1200 VA IxE

B) IxExPf 840 watts

Question 5

If the frequency of a parallel circuit is increased:

Answer 5

Z increases

Angle theta decreases

Question 6

In a series RL circuit, the vector sum of the currents equals the total current.

Answer 6

False

Question 7

In a series RL circuit power delivered by tge source is apparent power.

Answer 7

True

Question 8

In a parallel RL circuit power delivered by the source is apparent power.

Answer 8

True

Question 9

When the resistance of a parallel RL circuit is increased the circuit becomes more inductive.

Answer 9

True

Question 10

When the resistance of a series RL circuit is increased the circuit becomes more inductive.

Answer 10

False

Question 11

When the inductance of a series RL circuit increases, angle theta increases.

Answer 11

True

Question 12

In a parallel RL circuit, the voltage across each branch is the same.

Answer 12

True

Question 13

The current is the same at all points in a parallel RL circuit

Answer 13

False

Question 14

Current in the capacitive branch is in phase with the voltage.

Answer 14

False

Question 15

The current in the resistive branch is in phase with the voltage

Answer 15

True

Question 16

Current in the capacitive branch leads current in the resistive branch by 90 degrees

Answer 16

True

Question 17

Voltages across the resistive and capacitive branches are 90 degrees out of phase

Answer 17

False

Question 18

Total current times applied voltage gives the ________ power

Answer 18

Apparent

Question 19

In any reactive circuit which is larger: true power or apparent power?

Answer 19

Apparent power

Question 20

When is true power equal to apparent power?

Answer 20

Only in a completely resistive circuit

Question 21

If the frequency of a parallel RC circuit is increased

Answer 21

The It increases
Xc decreases
Phase angle increases
Power factor decreases