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- 1. Multiple Choice
For increasing the voltage ___________ is used.
Step up transformer
Step down transformer
Current transformer
- 2. Multiple Choice
Transformer is always connected to ___________ supply.
A.C.
D.C.
- 3. Multiple Choice
A transformer has primary voltage 200V and secondary voltage 100V , the transformer is called _______ .
Step up
Step Down
None
- 4. Multiple Choice
Transformer transforms _________ from primary to secondary.
Only Current
Only Voltage
Both Voltage and Current
- 5. Multiple Choice
If a transformer reduces voltage, it is called a....................... transformer.
step left
step right
step up
step down
- 6. Multiple Choice
A laminated transformer core reduces the amount of energy that is wasted in the form of........
solidifying
flux
heat
- 7. Multiple Choice
The core of a transformer is made up of:
iron
steel
copper
- 8. Multiple Choice
Electrical symbol of a TRANSFORMER
- 9. Multiple Choice
Thin laminated sheets of Iron are used instead of solid block to:
Increase resistance in core
Reduce the heating effect
Reduce the amount of magnetic flux
- 10. Multiple Choice
This picture is an example of a ___________
Step- Up Transformer
Step- Down Transformer
DC Motor
AC Generator
- 11. Multiple Choice
The winding of wire around a core which is connected to a source of energy is called the ....... coil.
primary
secondary
tertiary
- 12. Multiple Choice
Calculate potential difference in the secondary coil based on the information given below.
Vp = 240 V
Np = 20
Ns = 125
Vs ?
1500
500
1000
2000
- 13. Multiple Choice
Which of the following is an example of appliance using alternating power source?
- 14. Multiple Choice
Why transformers work with A.C. current but not D.C.
A.C current produces changing magnetic field.
D.C current produces changing magnetic field.
D.C current is weak
A.C current is powerful
- 15. Multiple Choice
A transformer has 100 turns in the primary coil and 25 turns in the secondary coil. When a 120 V is applied to the primary coil, what is the voltage in the secondary coil?
480V
30V
20V
450V
- 16. Multiple Choice
The transformer is a device used to .......... the value of a voltage.
steady
resist
change
anchor
- 17. Multiple Choice
The value of the second winding voltage of an iron-core transformer depends upon the ....... of turns, this winding contains as compared to the number of ........ winding turns.
primary, size
number, primary
size, height
number, size
- 18. Multiple Choice
Primary winding of a transformer is determined by _________.
which winding has more turns
which winding is nearer to the load
which winding is connected to the source
which side has the highest voltage
- 19. 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
- 20. Multiple Choice
Who is this transformer?
Optimus prime
Megatron
Bumble Bee
Cogman
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