1.A transformer has an output coil with 3 times as many turns as the input coil.

Question

1.A transformer has an output coil with 3 times as many turns as the input coil. If the input frequency is f then the output frequency will be. a) 9f b) 3f c)1/3 f d) f

2. An ac source of period T and maximum voltage V is connected to a single unknown ideal element that is either a resistor, and inductor, or a capacitor. At time t = 0 the voltage is zero. At time t = T/4 the current in the unknown element is equal to zero, and at time t = T/2 the current is I = -Imax, whereImax is the current amplitude. What is the unknown element?

a) an inductor

b) a resistor

c) a capacitor

d) an inductor or a capacitor

3.Consider an alternating current circuit with a resistor, an inductor, and a capacitor in series. The voltage from the AC source is V= Vmax
sin (2?ft) with the Vmax held fixed and the frequency adjustable. Which of the following statements is correct?

a) At very high frequencies, the voltage across the inductor is greater than the voltage across the capacitor.

b)At very high frequencies, the voltage across the inductor is less than the voltage across the capacitor.

c)The voltage across the inductor is equal to the voltage across the capacitor.

4.Is the phase angle between the current and the voltage in a RCL circuit at resonance

a) 0 degree

b) 90 degree

c) 180 degree

Explanation / Answer

1) d) f

2) d) an inductor or a capacitor

3) a) At very high frequencies, the voltage across the inductor is greater than the voltage across the capacitor.

4) a) 0 degree

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