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- 1. Multiple Choice
The function of a transformer is to ...
raise and lower the apparent power levels
transfer DC voltage from the primary winding to the secondary winding
increase or decrease A.C voltage or A.C current levels
transform mechanical energy into electrical energy
- 2. Multiple Choice
A step up transformer has its primary winding to secondary winding ratio
Greater than 1
Equal to 1
Less than 1
Unknown
- 3. Multiple Choice
Primary winding of a transformer is determined by ...
which winding is nearer to the load
which winding is connected to the source
which winding has more turns
which side has the highest voltage
- 4. Multiple Choice
Choose the correct statement:
The ratio of the secondary voltage to the primary voltage is equal to the ratio of the primary turn to the secondary turn
The ratio of the primary current to the secondary current is equal to the ratio of the primary voltage to the secondary voltage
The ratio of the primary apparent power to the secondary apparent power is equal to the ration of the primary voltage to the secondary voltage
The ratio of the secondary current to the primary current is equal to the ratio of the primary turn to the secondary turn
- 5. Multiple Choice
Assume primary has 240 turns and secondary has 60 turns. Primary is connected with 120V AC power supply. What is the voltage on the secondary?
30 V
0.333 V
2 V
120V
- 6. Multiple ChoiceRatio of voltages is equal to ratio ofiron sheets in corecoilnumber of turns in coilall of above
- 7. Multiple Choice
This picture is an example of a ___________Step- Up TransformerStep- Down TransformerMotorGenerator - 8. Multiple Choice
Laminated insulation are normally used in the transformer:
To reduce the hysteresis effect
To increase the hysteresis effect
To reduce the effect of eddy current
To increase the effect of eddy current
- 9. Multiple Choice
If the primary power of an ideal transformer having a 2:1 voltage ratio is 100 W, the secondary power is:
200 W
75 W
50 W
100 W
- 10. Multiple Choice
A transformer does not change the following:
Frequency
Voltage
Current
None of these
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