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WorksheetsTransformer
Total questions: 17
Worksheet time: 9mins
A transformer is a device that changes the voltage of
a direct current
an alternating current
Two types of transformer are in terms of voltage
step-in transformer
step-out transformer
step-down transformer
step-up transformer
Calculate voltage in the secondary coil based on the information given below.
Vp = 240 V
Np = 20
Ns = 125
Vs ?
1500 Turns
1500 V
1500A
Transformer is always connected to ___________ supply.
A.C.
D.C.
Transformer transforms _________ from primary to secondary.
Only Current
Only Voltage
Both Voltage and Current
The core of a transformer is made up of:
iron
steel
copper
Electrical symbol of a TRANSFORMER
The following parts of the transformer are...
Emitter/base/ collector
Core/primary coil/secondary coil
Anode/Cathode
The output voltage in a fly-back transformer of a CRT television is
10Kv
10V
100 Kv
the lose of current in the transformer is because...
The magnetic field between the core and the coil
The internal resistance
the Voltage supplied
The main use of the current transformer is...
As measurement transformer
As Current controller
As Voltage regulator
In a 12 V transformer connected to a regular 120 V /5 A line. the output current will be
50 A
20 A
1.2 A
In a transformer with 200 turns in the primary coil and 25 turns in the secondary coil the ratio will be...
1:8
8:1
12:1
The transformer with 3 levels of output voltage two equals and one that is the double is also called...
Center tap transformer
Double tap transformer
Single tap transformer
The highest voltage found in a flyback trasnfomer is..
10 KV
13 Kv
240 V
Is the metal used to build the coils of transformers
Aluminum
copper
steel
The highest output voltage of a center tap transfomer with 10 V in one section is.
20 V
10 V
24 V
