Daily review: Circuit Breakers | Transformers…

Q: What is the primary function of a circuit breaker?

To protect a circuit from overcurrents and short circuits. — Circuit breakers act as safety devices, disconnecting the circuit during faults.

Q: A transformer with more turns on the secondary coil than the primary coil is a:

Step-up transformer. — More secondary turns mean a higher output voltage than the input.

Q: The voltage divider rule is used to determine:

The voltage across a specific resistor in a series circuit. — The VDR is specifically for voltage division in series circuits.

Q: What could happen if a circuit breaker's current rating is too low for the connected load?

The circuit breaker will trip prematurely. — Too low rating means it will trip even under normal operating conditions.

Q: In a step-down transformer, if the primary voltage is 240V and the turns ratio is 2:1 (primary:secondary), what is the secondary voltage?

120V — The voltage is reduced by the turns ratio.

Q: Which of the following is NOT a typical application of a transformer?

AC to DC conversion. — AC-DC conversion is typically done using rectifiers and not transformers directly.

Q: A series circuit consists of two resistors, R1 = 10 ohms and R2 = 20 ohms. If the source voltage is 30V, what is the voltage across R1 using the voltage divider rule?

10V — V1 = Vsource * (R1 / (R1+R2)) = 30 * (10/30) = 10V

Q: What is the key advantage of using a circuit breaker over a fuse?

It can be easily reset after tripping. — Circuit breakers can be reset, unlike fuses which must be replaced.

Q: The turns ratio of a transformer is defined as:

The ratio of secondary turns to primary turns. — Turns ratio = Ns/Np; where Ns is number of turns in secondary winding and Np is number of turns in primary winding.

Q: If a transformer's primary voltage is 120V and the secondary voltage is 24V, what type of transformer is it?

Step-down. — Secondary voltage is lower than the primary voltage, so it is step-down.

Question 1 of 10

What is the primary function of a circuit breaker?

Circuit breakers act as safety devices, disconnecting the circuit during faults.

Question 2 of 10

A transformer with more turns on the secondary coil than the primary coil is a:

More secondary turns mean a higher output voltage than the input.

Question 3 of 10

The voltage divider rule is used to determine:

The VDR is specifically for voltage division in series circuits.

Question 4 of 10

What could happen if a circuit breaker's current rating is too low for the connected load?

Too low rating means it will trip even under normal operating conditions.

Question 5 of 10

In a step-down transformer, if the primary voltage is 240V and the turns ratio is 2:1 (primary:secondary), what is the secondary voltage?

The voltage is reduced by the turns ratio.

Question 6 of 10

Which of the following is NOT a typical application of a transformer?

AC-DC conversion is typically done using rectifiers and not transformers directly.

Question 7 of 10

A series circuit consists of two resistors, R1 = 10 ohms and R2 = 20 ohms. If the source voltage is 30V, what is the voltage across R1 using the voltage divider rule?

V1 = Vsource * (R1 / (R1+R2)) = 30 * (10/30) = 10V

Question 8 of 10

What is the key advantage of using a circuit breaker over a fuse?

Circuit breakers can be reset, unlike fuses which must be replaced.

Question 9 of 10

The turns ratio of a transformer is defined as:

Turns ratio = Ns/Np; where Ns is number of turns in secondary winding and Np is number of turns in primary winding.

Question 10 of 10

If a transformer's primary voltage is 120V and the secondary voltage is 24V, what type of transformer is it?

Secondary voltage is lower than the primary voltage, so it is step-down.

Daily review: Circuit Breakers | Transformers | Voltage Divider Rules Quiz