ENG4216-B

Basic construction of transformer contains three parts, which are: 

• Primary winding, Secondary Winding and Iron core

• Primary winding, Secondary Winding and Rotor

• Rotor, Stator and Winding

• Armature, Shaft and bearings

A transformer used to transfer complex signals, containing large number of frequencies, form one circuit to another is called _______ 

• Signal Transformer

• Power Transformer

• Auto Transformer

• Instrument Transformer

Power loss caused by magnetism that remains in a material after the magnetizing force has been removed is called ________. 

• Hysteresis loss

• Eddy current loss

• Resistive loss

• Dielectric loss

Electrical transformers are rated in terms of _____________________.

• volt-amperes (VA)

• Watts (W)

• volt-ampere reactive (VAR)

• horsepower (HP)

Determine the current in the secondary circuit of transformer as shown. 

• 10A

• 1A

• 5A

• 0A

What type of winding methods in electrical transformer is used in below picture? 

• Helical

• Disc

• pancake

• layer

Describe the construction type of 3 phase transformer shown in the picture. 

• core type

• shell type

• air core

• none of the choices

What type of instrument transformer is illustrated in the picture below?

• current transformer

• potential transformer

• power transformer

• none of the choices

Which 3-phase transformer is used to convert 3-wire system to 4-wire system with neutral available? 

• Delta – Star (Δ - Y)

• Star – Delta (Y - Δ)

• Star – Star (Y - Y)

• Delta – Delta (Δ - Δ)

What is the type of connection for the three-phase transformer below? 

• Wye-Delta

• Wye-Wye

• Delta-Delta

• Delta-Wye