BEE Cheat Sheet 2026

The 30 highest-yield BEE facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. What is the purpose of a tap-changer on a power transformer in a transmission substation? → Regulate the secondary voltage by adjusting the turns ratio while energized
2. Which characteristic distinguishes a reluctance motor from a conventional synchronous motor? → It has no field winding or permanent magnets; it runs synchronously due to rotor saliency
3. Which system from the list below is described by partial differential functions? → Distributed parameter systems and Dynamic systems
4. A discrete-time system is stable if all poles of its transfer function H(z) lie: → Inside the unit circle
5. In mesh analysis, mesh currents are defined to flow in which direction by convention? → Clockwise
6. In a purely capacitive AC circuit, the current: → Leads voltage by 90°
7. A Wheatstone bridge is balanced when which condition is satisfied? → R1/R2 = R3/R4
8. What does the acronym ALU stand for in microprocessor architecture? → Arithmetic Logic Unit
9. On a Bode plot, what is the slope (in dB/decade) introduced by each additional open-loop pole? → -20 dB/decade
10. In the context of nodal analysis, what is a 'supernode' used for? → To handle a voltage source connected between two non-reference nodes.
11. The bandwidth of a series RLC resonant circuit is defined as: → BW = R / L
12. In signal flow graphs, Mason's gain formula is used to find: → The overall transfer function from input to output
13. For a second-order underdamped system, which parameter directly determines the frequency of oscillation in the transient response? → Damped natural frequency
14. The Miller effect in an inverting amplifier stage causes the input capacitance to appear as: → Cgd × (1 + |Av|)
15. What is the significance of the 'critical clearing time' in transient stability analysis? → The maximum fault duration for which the system remains transiently stable
16. The phase margin of a control system is measured at: → The gain crossover frequency
17. A closed-loop control system is said to be type 1 if its open-loop transfer function has: → One pole at the origin
18. Which Boolean identity represents De Morgan's theorem for a two-input AND gate? → (AB)' = A' + B'
19. In a purely resistive AC circuit, what is the phase angle between voltage and current? → 0 degrees
20. In a Bode plot, a first-order pole contributes what slope change at its corner frequency? → -20 dB/decade
21. Speed control of a DC shunt motor can be achieved by: → Both armature resistance variation and field current variation
22. What does a phase margin of 0 degrees indicate about a feedback control system? → The system is on the verge of instability
23. Who developed an approach to measure current and defined electric current? → Andre-Marie Ampere
24. Which of the following input-output relationships, y(t), describes a system that is linear but NOT time-invariant? → y(t) = x(t) * cos(2πt)
25. A power factor meter used in a single-phase circuit has how many current coils and voltage coils? → One current coil and two voltage coils
26. A 10 Ω resistor and a 20 Ω resistor are connected in parallel across a 40 V DC source. What is the total current drawn from the source? → 6 A
27. Which of the following relationships is correct? → Tera>Giga>Mega
28. In a purely inductive AC circuit, the current lags the voltage by: → 90°
29. In a voltage divider with resistors R1 and R2 in series across a supply voltage Vs, the voltage across R2 is: → Vs × (R2 / (R1 + R2))
30. A 10 V source is connected across two parallel resistors of 4 Ω and 12 Ω. What is the total current supplied by the source? → 3.33 A