DEA Design of core and yoke in transformer

Which of the following is the primary purpose of the yoke in a transformer?

• A) To increase the magnetic flux density

• B) To reduce the magnetic flux density

• C) To direct the magnetic flux through the core

• D) To provide mechanical support to the core

Which material is commonly used for the core of a transformer?

• A) Copper

• B) Aluminum

• C) Steel

• D) Silver

The shape of the core in a transformer is typically:

• A) Circular

• B) Square

• C) Rectangular

• D) Triangular

Which of the following is the purpose of using laminations in the core of a transformer

• ? A) To reduce the cost of the transformer

• B) To reduce the weight of the transformer

• C) To reduce eddy current losses

• D) To increase the magnetic flux density

The magnetic circuit in a transformer consists of:

• A) The yoke, core, and winding

• B) The core and winding

• C) The yoke and core

• D) The winding and the magnetic field

The cross-sectional area of the core in a transformer is typically:

• A) Small

• B) Large

• C) Medium

• D) Variable

The formula used for calculating the cross-sectional area of the yoke in a transformer is:

• A) A = (B × l) / H

• B) A = (H × l) / B

• C) A = (B × H) / l

• D) A = (l × H) / B

The formula used for calculating the flux density in the core of a transformer is:

• A) B = (Φ × l) / (A × N)

• B) B = (N × Φ) / (A × l)

• C) B = (A × Φ) / (N × l)

• D) B = (N × Φ) / (A × H)

The formula used for calculating the voltage induced in a transformer is:

• A) E = N × dΦ/dt

• B) E = Φ / (2πf)

• C) E = N × Φ

• D) E = Φ / t

What is the formula for calculating the magnetic field strength of the yoke in a transformer?

• a) H = Nl / μ

• b) H = μN / l

• c) H = μl / N

• d) H = N / μl