DEA single phase transormer

What is the formula for calculating the output power of a single phase transformer?

• a) P = IV

• b) P = VI

• c) P = V^2/R

• d) P = V^2/X

What is the unit of power in the output power equation of a single phase transformer?

• a) Watts

• b) Volts

• c) Amperes

• d) Ohms

In the output power equation of a single phase transformer, what does V represent?

• a) Voltage across the primary winding

• b) Voltage across the secondary winding

• c) Voltage drop across the core

• d) Voltage drop across the windings

In the output power equation of a single phase transformer, what does X represent?

• a) Primary reactance

• b) Secondary reactance

• c) Core reactance

• d) Total reactance

What is the EMF equation of a single-phase transformer?

• A. E = 4.44 f Nϕ

• B. E = 2.22 f Nϕ

• C. E = 1.11 f Nϕ

• D. E = 0.22 f Nϕ

In the EMF equation of a transformer, what does f stand for?

• A. Frequency

• B. Flux density

• C. Turns ratio

• D. Voltage

In the EMF equation of a transformer, what does N stand for?

• A. Number of turns

• B. Frequency

• C. Voltage

• D. Flux density

In a transformer, if the number of turns in the primary winding is 500 and the number of turns in the secondary winding is 250, what is the turns ratio?

• A. 2

• B. 0.5

• C. 1

• D. 4

If the voltage on the primary winding of a transformer is 240V and the turns ratio is 1:2, what is the voltage on the secondary winding?

• A. 480V

• B. 120V

• C. 240V

• D. 60V

In a transformer, what is the effect of increasing the frequency of the AC supply?

• A. It increases the EMF

• B. It decreases the EMF

• C. It has no effect on the EMF

• D. It increases the current