Basic Electrical Engineering Practice Test 2

1. Which, among the following is the right expression for converting from delta to star?

R1=Ra/(Ra+Rb+Rc), R2=Rb/(Ra+Rb+Rc), Rc=/(Ra+Rb+Rc)

R1=Ra*Rb*Rc/(Ra+Rb+Rc), R2=Ra*Rb*Rc/(Ra+Rb+Rc), R3=Ra*Rb*Rc/(Ra+Rb+Rc)

R1=Ra*Rb*Rc/(Ra+Rb+Rc), R2=Ra*Rb/(Ra+Rb+Rc), R3=Ra/(Ra+Rb+Rc)

R1=Ra*Rb/(Ra+Rb+Rc), R2=Rb*Rc/(Ra+Rb+Rc), R3=Rc*Ra/(Ra+Rb+Rc)

2. In superposition theorem, when we consider the effect of one voltage source, all the other voltage sources are ____________

Opened

Shorted

Undisturbed

Removed

3. A current source connected in parallel with a resistor can be converted to a?

Voltage source in series with a resistor

Voltage source in parallel with a resistor

Current source in series with a resistor

Cannot be modified

4. Find the value of Vx due to the 10V source.

5. Which of the following is also known as the dual of Thevenin’s theorem?

Superposition theorem

Millman’s theorem

Norton’s theorem

Maximum power transfer theorem

6. How many nodes are taken as reference nodes in a nodal analysis?

7. Which, among the following is the correct expression for star-delta conversion?

R1=Ra/(Ra+Rb+Rc), R2=Rb/(Ra+Rb+Rc), Rc=/(Ra+Rb+Rc)

R1=Ra+Rb+Ra*Rb/Rc, R2=Rc+Rb+Rc*Rb/Ra, R3=Ra+Rc+Ra*Rc/Rb

R1=Ra*Rb/Rc, R2=Rc*Rb/Ra, R3=Ra*Rc/Rb

R1=Ra*Rb/(Ra+Rb+Rc), R2=Rb*Rc/(Ra+Rb+Rc), R3=Rc*Ra/(Ra+Rb+Rc)b)

8. Mesh analysis can be used for __________

Planar circuits

Both planar and non-planar circuits

Non-planar circuits

Neither planar nor non-planar circuits

9. Find the equivalent delta circuit.

9.69 ohm, 35.71 ohm, 6.59 ohm

10.69 ohm, 35.71 ohm, 6.59 ohm

9.69 ohm, 34.71 ohm, 6.59 ohm

10.69 ohm, 35.71 ohm, 7.59 ohm

10. Superposition theorem does not work for ________

Voltage

Current

Works for all: current, voltage and power

Power