NOCTI Review 1 DC/AC Circuits

Question 1

In a series circuits:

Answer 1

The current is the same in each resistor.

Question 2

An open in a series circuit results in:

Answer 2

A. Zero current in all components

B. The applied voltage vein measured across the open terminals

Question 3

In a parallel circuit the total resistance equals:

Answer 3

The total voltage divided by total current.

Question 4

How much resistance must be connected in parallel with 120 Ohms to obtain an equivalent resistance of 72 Ohms?

Answer 4

180 Ohms

Question 5

A short in just one branch of a parallel circuit will:

Answer 5

Effectively short out all other branches.

Question 6

A 50 Ohm, a 100 Ohm, and a 200 ohm resistors are connected in parallel across a 24 V DC source. If the voltage is doubled to 48V, the combined resistance will:

Answer 6

Stay the same.

Question 7

A 10 Ohm resistor, R1 is in a series with a 40 ohm resistor, R2. The resistors are connected across a 50V DC source. Resistor R1 will:

Answer 7

Drop 20% of the applied voltage.

Question 8

Three equal resistances are connected in parallel across a 24V DC source. Will each resistor dissipate the same power? (True/False)

Answer 8

True.

Question 9

In order to increase the current capacity of a single cell:

Answer 9

Connect additional cells in parallel.

Question 10

For an ideal capacitor:

Answer 10

V lags I by 90 degrees

Question 11

For any capacitor, Xc is:

Answer 11

Inversely proportional to capacitance

Question 12

For a parallel RC circuit:

Answer 12

Ic leads Ir by 90 degrees

Question 13

For an effective RC coupling circuit when Xc is less than one tenth the series R, 0 equals approximately:

Answer 13

0 degrees

Question 14

The unit of inductive reactance, Xl, is the:

Answer 14

Ohm

Question 15

A cosine wave has its maximum values at

Answer 15

0 degrees and 180 degrees

Question 16

For a series RL circuit, an increase in generator frequency causes 0 to:

Answer 16

Increase

Question 17

For a parallel RL circuit:

Answer 17

Vr and VL are 180 degrees out of phase.

Question 18

In a series RL circuit, the total current, It, is in phase with:

Answer 18

VR