Transformer Working and Construction Quiz

If a transformer reduces voltage, it is called a....................... transformer.

• step left

• step right

• step up

• step down

If a transformer increases voltage, it is called a ......... transformer.

• step right

• step left

• step up

• step down

The winding of wire around a core which is connected to a source of energy is called the ....... coil.

• primary

• secondary

• tertiary

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

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

Which of the following is an example of appliance using alternating power source?

• 
• 
• 
• 

Tags

NGSS.HS-PS2-5

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

Tags

NGSS.HS-PS2-5

What is the material used for construction of transformer core?

• Aluminium

• Copper

• Iron

• Wood

This picture is an example of a ________________.

• Motor

• Generator

• Step-up transformer

• Step-down transformer

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-3

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

If the transformer shown is 80% efficient, calculate the power at the primary coil.

• 30W

• 24W

• 36.5W

• 19.2W

Tags

NGSS.HS-PS3-1