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Transformer

Total questions: 29

Worksheet time: 34mins

Name
Class
Date
1.

Apakah yang dimaksudkan dengan transformer?

a)

Alat yang ubah voltan arus ulang alik

b)

Berfungsi meninggikan voltan output

c)

Berfungsi menurunkan voltan output

2.

Nyatakan jenis transformer berdasarkan gambar tersebut .

a)

Transformer injak naik

b)

Transformer injak turun

3.

Berikut adalah kenyataan yang betul bagi transformer injak naik kecuali.....

a)

Bilangan lilitan gegelung primer kurang daripada bilangan lilitan pada gegelung sekunder (Np < Ns)

b)

Arus output lebih tinggi dari arus input

c)

Berfungsi untuk merendahkan voltan output

d)

Voltan input lebih rendah daripada voltan output (Vp < Vs)

4.

Yang manakah kenyataan yang benar mengenai transformer injak turun?

a)

Menurunkan voltan output

b)

Bilangan lilitan gegelung primer kurang daripada gegelung sekunder (Np<Ns)

c)

Arus input lebih tinggi daripada arus output

d)

Meninggikan voltan output

5.

Vp = 240 V

Np = 2

Ns = 125

Vs ?

Kirakan.

a)

15

b)

5

c)

10

d)

20

6.

Kirakan berapakah voltan output jika sesuatu transformer mempunyai 240 lilitan gegelung primer dan 60 gegelung sekunder. Gegelung primer disambungkan pada voltan input 120 V.

a)

30

b)

480

c)

20

d)

380

7.

Satu transformer mempunyai bekalan voltan input 12 V dan voltan output 60 V. Berapakah bilangan lilitan gegelung primer jika bilangan gegelung sekunder adalah 10 lilitan?

a)

50

b)

25

c)

2

d)

5

8.

Vp = 35 V

Np = 355

Ns = 4500

Kirakan Vs.

a)

443.7 V

b)

22.5 V

c)

2.76 V

d)

338.9 V

9.

Kirakan bilangan lilitan sekunder yang diperlukan untuk mengubah voltan primer 300 V ke voltan sekunder 180 V jika lilitan sekunder primer adalah 1150.

a)

690

b)

144

c)

1918

d)

460

10.

Apakah fungsi sesebuah transformer?

a)

Mengalirkan arus elektrik daripada pencawang bahagian ke rumah

b)

Satu alat yang boleh meningkatkan atau menurunkan voltan arus ulang terus

c)

Satu alat yang boleh meningkatkan atau menurunkan voltan arus ulang alik

d)

Menyukat jumlah tenaga elektrik yang digunakan dirumah

11.

Transformer terdiri daripada ........ bahagian

a)

2

b)

3

c)

4

d)

5

12.

Antara berikut adalah 3 bahagian sebuah transformer

a)

Teras besi lembut

b)

Fius

c)

Gegelung Sekunder

d)

Gegelung Primer

e)

Pemutus litar

13.

Berikut adalah rajah sebuah.....

a)

Transformr Injak Naik

b)

Fius Utama

c)

Transformer Injak Turun

d)

Pencawang Utama

14.

Rajah menunjukkan sebuah komponen yang digunakan dalam penghantaran tenaga elektrik. Komponen tersebut digunakan untuk...

a)

meningkatkan voltan bagi arus terus

b)

meningkatkan voltan bagi arus ulang alik

c)

menurunkan voltan bagi arus ulang alik

d)

menurunkan voltan bagi arus terus

15.

Kenal pasti bahagian transfomer yang menerima voltan input daripada bekalan kuasa

a)

Dawai Bumi

b)

Dawai Hidup

c)

Gegelung Primer

d)

Gegelung Sekunder

16.

Bilangan lilitan pada gegegelung primer transfomer injak naik adalah

a)

sedikit

b)

banyak

17.

Tansformer P ini mempunyai voltan output yang ..........daripada transfomer Q

a)

lebih tinggi

b)

lebih rendah

c)

sama

d)

tiada perubahan

18.
If a secondary coil has 40 turns, and, a primary coil with 20 turns is charged with 50 V of potential difference, then potential difference in secondary coil would be
a)
50 V in secondary coil
b)
25 V in secondary coil
c)
60 V in secondary coil
d)
100 V in secondary coil
19.
This picture is an example of a ___________
a)
Step- Up Transformer
b)
Step- Down Transformer
c)
Motor
d)
Generator
20.
Based on this picture, which side will have a higher voltage?
a)
Secondary
b)
Primary
c)
Both sides have the same voltage
d)
Cannot be determined
21.
An ideal transformer has 12 V input voltage with 10 turns on the primary (input) coil, The secondary coil has 100 turns. What is the secondary voltage?
a)
0.12 V
b)
1.20 V 
1.20 V
c)
12.0 V
d)
120.0 V
22.
A magnet is moved in and out of a coil of wire connected to a high-resistance voltmeter. If the number of coils doubles, the induced voltage 
a)
quadruples
b)
doubles
c)
is the same
d)
halves
23.
A device that uses two coils around an iron core to change the voltage across a circuit is called a 
a)
voltmeter
b)
diode
c)
transformer
d)
generator
24.
The voltage across the primary coil of a transformer that has 75 turns on it is 100 V.  What is the voltage across the secondary coil, which has 15 turns on it?
a)
500 V
b)
25 V
c)
125 V
d)
20 V
25.
The primary coil of a transformer has 80 turns on it, and the secondary coil has 40 turns on it.  This is 
a)
a step-up tansformer
b)
a step-down transformer
c)
either of the above depending on the relative input and output currents.
26.
Step up transformers can be used to get more energy out of them than is put into them.
a)
True
b)
False
c)
Not enough is given.
27.
The voltage across the primary coil of a transformer that has 75 turns on it is 100 V.  What is the voltage across the secondary coil, which has 15 turns on it?
a)
500 V
b)
25 V
c)
125 V
d)
20 V
28.
The primary coil of a transformer has 80 turns on it, and the secondary coil has 40 turns on it.  This is 
a)
a step-up tansformer
b)
a step-down transformer
c)
either of the above depending on the relative input and output currents.
29.
The voltage across the primary coil of a transformer that has 75 turns on it is 100 V.  What is the voltage across the secondary coil, which has 15 turns on it?
a)
500 V
b)
25 V
c)
125 V
d)
20 V

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