Questions -

Q1. Which of the following is a TRUE statement about the pairs of conductors shown below:

a. Conductors in (i) attract each other

b. Conductors in (ii) repel each other

c. Conductors in (iii) attract each other

d. Conductors in (iv) attract each other

Q2. The figure below shows an ideal transformer with a load connected to the secondary winding. With a primary voltage (V1) of 100V, a turns ratio (n) of 1/100 and 100Ω load (R2), what is the voltage across the load?

a. 100V

b. 1000V

c. 1V

d. 100,000V

Q3. In the figure below the effective capacitance of the circuit is:

a. 7.5 μF

b. 13.3 μF

c. 100 μF

d. 40 μF

Q4. A coil of 200 turns experiences a change of magnetic flux from 0 Wb to 10 Wb in 2 s. Which of the following is the value of the induced voltage?

a. 1000V

b.2000V

c.400V

d. 500V

Q5. A 33 μF capacitor charges from a 10 V battery through a resistor of 10 kΩ. Assuming the capacitor is fully discharged initially, how long will it take the capacitor to charge to 6.32V?

a.3 seconds

b. 0.33 seconds

c. 3 minutes

d. 10.3 seconds

Q6. Which of the following statements is TRUE?

a. Faraday's Law states that the voltage induced in a coil gets higher if the rate of change of magnetic flux over time gets smaller.

b. The magnetic flux density, B, is the magnetic flux times the area.

c. The SI units for magnetic flux intensity, H, is the Tesla.

d. The SI units for magnetic flux density, B, is the Tesla

Q7. A 500 μF capacitor charges from a 12 V battery through a resistor of 12 kΩ. if the capacitor was charged to 3V initially how long would it take to charge to 10V?

a.2.9 seconds

b. 10.04 seconds

c. 0.54 seconds

d. 9.02 seconds

Q8. If a current of 2A exists in a circuit the quantity of electricity (Q) transferred in 16 seconds is:

a.2 C

b.12 C

c. 32 C

d. 16 C

Q9. The figure below shows an ideal transformer with a load connected to the secondary winding. Determine the resistor connected to the voltage source (R1) when a voltage source (V1) of 100V, a transformer turns ratio (n) of 1/100 and the load connected to the secondary winding is 1000 (R2).

a. R₁=n²R₂=10^-4x100=10^-2Ω

b. R₁=R₂/n²=100/10^-4=10⁶Ω

c. R₁=R₂/n=100/100=1Ω

d. R₁=nR₂=100x100=10000Ω

Q10. The RC time-constant for the circuit shown in the figure below is the time taken from the instant that the switch is closed for the voltage across the capacitor to reach approximately:

a. E(1-e^-1)

b. (1-e^-1)/E

c. Ee^-1

d. E(1-e^-1)