EEITG31D_Oral Quiz 2

In an inductive circuit, when inductance (L) or inductive reactance (XL) increases, the circuit current decreases, but the circuit power factor ________?

• increases

• also decreases

• remains the same

• none of the choices

If the current and voltage are 90 degrees out of phase, then the power (P) will be__________.

• infinite

• maximum

• minimum

• normal

• zero

Using the formula P = VI Cos θ, we can find _______.

• Power of single phase Circuit

• The voltage of single-phase circuit

• The current of single-phase circuit

• The power factor of single-phase circuit

• All of the choices

Write the relationship between the impedance (Z) and the admittance (Y).

What is the average value of a sinusoidal alternating signal in one full cycle?

The average value of a sinusoidal alternating signal is __________.

• equal to the maximum value

• half of the maximum value

• 2/π times the maximum value

• none of the choices

What is the form factor of a sinusoidal waveform?

Write your answer in two decimal places.

Alternating current across a conductor is _________.

• uniform throughout

• more at the outer surface than the core

• more at the core than at the surface

• zero at the core

A resistor of 8 ohms and a capacitor of 178 𝜇F are connected in series across a 250 V, 50 Hz supply. What is the value of the reactive power in VARS?

The current taken from a 230 V, 50 Hz supply is measured at 10 A with a lagging power factor of 0.7. A capacitor is connected in parallel with the load. What will happen to true power?

• increases

• decreases

• remains unchanged

• cannot be predicted

• none of the choices