1.

What kVA rating is required for a
transformer that must handle a maximum load current of 8 A with a secondary voltage of 2 kV? 

Answer: Option C

2.

The turns ratio required to match
an 80 ohm source to a 320 ohm load is 

Answer: Option D

3.

When the turns ratio of a
transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is 

Answer: Option C

4.

If a transformer has 50 turns in
the primary winding and 10 turns in the secondary winding, what is the reflective resistance if the secondary load resistance is 250 ohm? 

Answer: Option C

5.

A certain transformer has 400
turns in the primary winding and 2,000 turns in the secondary winding. The turns ratio is 

Answer: Option C


6.

The primary winding of a
transformer has 110 V ac across it. What is the secondary voltage if the turns ratio is 8? 

Answer: Option C

7.

To step 110 V ac down to 20 V ac,
the turns ratio must be 

Answer: Option C

8.

The mutual inductance when k
= 0.65, L1 = 2 micro H, and L2 = 5 micro H is 

Answer: Option B

9.

If 25 W of power are applied to
the primary of an ideal transformer with a turns ratio of 10, the power delivered to the secondary load is 

Answer: Option A

10.

A transformer with a 110 V primary
has a 15:1 turns ratio. The load resistance, RL, is 120 ohm. What is the approximate voltage across the load? 

Answer: Option A


11.

How many primary volts must be
applied to a transformer with a turns ratio of 0.1 to obtain a secondary voltage of 9 V? 

Answer: Option B

12.

In a certain loaded transformer,
the secondary voltage is onefourth the primary voltage. The secondary current is 

Answer: Option B

13.

A certain transformer has a turns
ratio of 1 and a 0.85 coefficient of coupling. When 2 V ac is applied to the primary, the secondary voltage is 

Answer: Option A

14.

The primary coil of a transformer
is connected to a 60 V ac source. The secondary coil is connected to a 330 ohm load. The turns ratio is 3:1. What is the secondary voltage? 

Answer: Option B

15.

The primary winding of a power
transformer should always be 

Answer: Option D


16.

A certain amplifier has 600 ohm internal resistance looking
from its output. In order to provide maximum power to a 4 ohm speaker, what turns ratio must be used in the coupling transformer? 

Answer: Option C

17.A transformer


Answer: Option D

18.

The primary of a transformer is
connected to a 6 V battery. The turns ratio is 1:3 and the secondary load, RL, is 100 ohm. The voltage across the load is 

Answer: Option A

19.

To step 120 V ac up to 900 V ac,
the turns ratio must be 

Answer: Option C

20.

When a 200 ohm load resistor is connected
across the secondary winding of a transformer with a turns ratio of 4, the source “sees” a reflective load of 

Answer: Option B


21.

In a certain transformer, the
input power to the primary is 120 W. If 8.5 W are lost to the winding resistance, what is the output power to the load, neglecting any other issues? 

Answer: Option C

22.

When a 6 V battery is connected
across the primary of a transformer with a turns ratio of 8, the secondary voltage is 

Answer: Option A

23.

What is the coefficient of
coupling for a transformer in which 4% of the total flux generated in the primary does not pass through the secondary? 

Answer: Option D

24.

A transformer has a 1:6 turns
ratio and a secondary coil load resistance of 470 ohm. The load resistance as seen by the source is 

Answer: Option D
