EMF Equation - MCQs with Answers

EMF Equation - MCQs with Answers

Q1. For the calculation of induced emf in a transformer the flux used in the equation is in its

a. RMS value
b. Average value
c. Maximum value
d. Double of its maximum value

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Q2. If the primary winding is excited by a purely sinusoidal alternating voltage, than the nature of the flux produced is

a. Square wave
b. Rectangular wave
c. Saw tooth wave
d. Sinusoidal wave

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Q3. The average emf induced per turn in a transformer is given by

a. 1.11f Φ_m
b. 0.5f Φ_m
c. 4f Φ_m
d. 8f Φ_m

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Q4. A transformer is said to be isolation transformer if its primary to secondary ratio is

a. Equal to one
b. More than one
c. Less than one
d. Equal to 0.5

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Q5. A 5kV / 250V, 50Hz single phase core type transformer with average flux in the core is 0.05wb. the number of turns in the primary winding is

a. 273
b. 278
c. 280
d. 287

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