BEE Basic Electrical 3

Question 1

A sinusoidal voltage v(t) = 170 sin(377t) V. What is the RMS value?

Accepted Answer

120.2 V

Answer

V_rms = V_peak / √2 = 170 / 1.414 ≈ 120.2 V.

Question 2

The time constant of an RC series circuit with R = 2 kΩ and C = 50 μF is:

Accepted Answer

0.1 s

Answer

τ = RC = 2000 × 50×10⁻⁶ = 0.1 s.

Question 3

In a purely capacitive AC circuit, the current leads the voltage by:

Accepted Answer

90°

Answer

In a purely capacitive circuit, the current leads voltage by 90° (or π/2 radians).

Question 4

Which of the following quantities is measured in Siemens?

Accepted Answer

Conductance

Answer

Conductance (G = 1/R) is measured in Siemens (S), the reciprocal of ohms.

Question 5

Two identical 12 V batteries with internal resistance 1 Ω each are connected in series. What is the total EMF and total internal resistance?

Accepted Answer

24 V, 2 Ω

Answer

Series connection adds EMFs (12+12=24 V) and internal resistances (1+1=2 Ω).

BEE - Bachelor of Electrical Engineering Practice Test