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An ideal transformer has 100 turns in the primary and 500 turns in the secondary. If the primary voltage is 120V and the primary current is 2A, what is the secondary current?
20 A
10 A
0.4 A
5 A
A step-up transformer operates on a 220V line and supplies a load of 2A. The ratio of the primary and secondary windings is 1:25. Determine the current in the primary, assuming an ideal transformer.
50 A
0.08 A
27.5 A
110 A
A transformer has 500 turns in the primary coil and 1000 turns in the secondary coil. If the input voltage is 120V, the output voltage is:
240V
60V
120V
480V
In an ideal transformer, the turns ratio is . What is the ratio ? (Symbols carry their usual meaning)
1:3
3:1
1:9
9:1
An ideal transformer has a primary to secondary turns ratio of 2:1. If the primary voltage is 120 V, what is the secondary voltage?
240 V
60 V
30 V
120 V
A step-down transformer has a turns ratio of 4:1. If the secondary voltage is 25 V, what is the primary voltage?
25 V
100 V
10 V
400 V
In an ideal transformer, if the number of turns in the primary coil is doubled and the number of turns in the secondary coil is halved, how does the secondary voltage change, assuming the primary voltage remains constant?
Doubles
Halves
Becomes one-fourth
Quadruples
Which of the following is NOT true about an ideal transformer?
It has no power loss.
The voltage ratio is equal to the turns ratio.
It changes the frequency of the AC supply.
The current ratio is inversely proportional to the turns ratio.
A transformer is having 2100 turns in primary and 4200 turns in secondary. An AC source of 120 V, 10 A is connected to its primary. The secondary voltage and current are
240 V,5 A
120 V, 10 A
240 V, 10 A
120 V, 20 A
A transformer is having 2100 turns in primary and 4200 turns in secondary. An AC source of 120 V, 10 A is connected to its primary. The secondary voltage and current are
240 V,5 A
120 V, 10 A
240 V, 10 A
120 V, 20 A
