appa lesson 4

What is the purpose of the EMF equation of a transformer?

• To calculate the resistance of the transformer

• To understand the working of the transformer

• To determine the weight of the transformer

• To measure the temperature of the transformer

What does the ratio of secondary EMF to primary EMF determine?

• The weight of the transformer

• The voltage transformation ratio of the transformer

• The resistance of the transformer

• The temperature of the transformer

What is the primary function of the magnetizing component in a transformer?

• To increase the weight of the transformer

• To reduce the efficiency of the transformer

• To generate heat in the core

• To produce the magnetizing flux

What is the power loss that occurs in the iron part of a transformer known as?

• Iron loss

• Stray loss

• Core loss

• Copper loss

What is the formula for calculating eddy current loss in a transformer?

• P = khf(βmax)^2

• P = I1^2Re1

• P = I2^2R2

• P = khf(βmax)^1.6

What is the power loss that occurs in the primary and secondary coils of a transformer when it is on load?

• Copper loss

• Iron loss

• Stray loss

• Core loss

What is the power factor angle of the primary side of a transformer determined by?

• The secondary current

• The primary current

• The applied voltage

• The load voltage

What is the total primary current in a transformer the phasor sum of?

• I1 and I2

• I1' and I0

• I1 and I0

• I1' and I2

What is the power factor angle of the secondary side of a transformer dependent on?

• The primary current

• The secondary current

• The load voltage

• The applied voltage

What is the formula for calculating hysteresis loss in a transformer?

• P = khf(βmax)^1.6

• P = khf(βmax)^2

• P = I1^2Re1

• P = I2^2R2