FE EXAM · ELECTRICAL & COMPUTER

FE Electrical & Computer Practice Questions

Practice FE-style Electrical & Computer questions through interactive engineering problems with guided reasoning and detailed solutions.

Interactive problems•Reasoning explained•Solutions included

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E-040 · FE ELECTRICAL & COMPUTER Computer Networks

The Router That Ignored the Shorter-Looking Route

Two routes matched the destination. The router chose the more specific prefix, not the visually simpler route.

Longest Prefix Match Intermediate 5–10 min

Solve This Question → The full solution unlocks after the investigation.

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Focus your practice.

Each topic groups questions around a specific FE knowledge area. Topic pages become indexable only after they contain a meaningful practice set.

Computer Networks

Open practice set → 3 QUESTIONS

Communications

Open practice set → 3 QUESTIONS

Control Systems

Open practice set → 3 QUESTIONS

Power Systems

Open practice set → 3 QUESTIONS

Electronics

Open practice set → 3 QUESTIONS

Signal Processing

Open practice set → 3 QUESTIONS

Linear Systems

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Circuit Analysis

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PRACTICE SET

Available questions

Choose a question and solve it before reading the final engineering verdict.

E-040Computer Networks

The Router That Ignored the Shorter-Looking Route

Two routes matched the destination. The router chose the more specific prefix, not the visually simpler route.

Longest Prefix Match5–10 min

E-039Computer Networks

The 1500-Byte Packet That Did Not Arrive in 12 Microseconds

Serialization took only 12 microseconds. The fiber path added another 500 microseconds.

Network Delay Components5–10 min

E-038Computer Networks

The /27 Network That Could Not Fit 40 Devices

The subnet looked large enough from the address range. The usable host count said otherwise.

Ipv4 Subnetting Host Capacity5–10 min

E-037Communications

The Four-Channel FDM Link That Needed 95 kHz

Four 20 kHz channels looked like an 80 kHz job—until the guard bands were counted.

Frequency Division Multiplexing Bandwidth5–10 min

E-036Communications

The PCM Link That Needed 64 kbps, Not 32

The voice channel bandwidth was 4 kHz. The data link was sized at 32 kbps and immediately overflowed.

Pcm Bit Rate5–10 min

E-035Communications

The AM Signal Whose Envelope Pinched Shut

The carrier was 5 V. The message amplitude was 6 V. The envelope detector stopped reproducing the message cleanly.

Am Modulation Index5–10 min

E-034Control Systems

The Higher-Gain Loop That Crossed Into Instability

Increasing gain improved response—until the characteristic equation crossed the stability limit.

Closed Loop Stability Routh5–10 min

E-033Control Systems

The Bode Plot That Lost 20 dB in One Decade

The low-frequency gain was 40 dB. One decade past the pole, the response was near 20 dB.

First Order Bode Pole5–10 min

E-032Control Systems

The Gain-10 Loop That Only Reached 0.909

The forward gain was 10. The closed-loop output did not become 10 times the reference.

Unity Feedback Closed Loop Response5–10 min

E-031Power Systems

The 8 Ohm Load That Became 128 Ohms

The secondary load was 8 Ω. The primary source did not see 8 Ω—or even 32 Ω.

Transformer Reflected Impedance5–10 min

E-030Power Systems

The Feeder That Delivered 228 V Instead of 240 V

The source measured 240 V. The load saw only 228 V because the feeder resistance was treated as one-way.

Distribution Voltage Drop5–10 min

E-029Power Systems

The Motor Load That Drew More Current Than the kW Suggested

The load was only 30 kW, but the feeder current was much higher than the kW-only calculation predicted.

Three Phase Power Factor5–10 min

E-028Electronics

The Op-Amp That Tried to Output -10 V on ±5 V Rails

The gain equation requests -10 V, but the amplifier only has ±5 V rails.

Op Amp Saturation5–10 min

E-027Electronics

The Transistor That Refused to Amplify 100×

An NPN switch has VCC = 5 V, Rc = 100 Ω, β = 100, and Ib = 1 mA. βIb predicts 100 mA, but with VCE(sat) ≈ 0.2 V the collector circ

Bjt Saturation5–10 min

E-026Electronics

The Protection Diode That Starved the 5 V Sensor

The reverse-polarity protection worked, but the 5 V sensor would not start.

Diode Forward Voltage5–10 min

E-025Signal Processing

The Digital Filter That Lagged a Perfect Step

A perfect step arrived. The filter answered 2.0 instead of 10.

Digital Filter Difference Equation5–10 min

E-024Signal Processing

The 1 kHz Filter That Only Passed 70.7%

A 'passband' tone reached the cutoff and lost nearly 30% of its amplitude.

Analog Low Pass Cutoff5–10 min

E-023Signal Processing

The Vibration Sensor That Invented a 300 Hz Tone

The machine says 900 Hz. The sampled spectrum insists on 300 Hz.

Sampling Aliasing5–10 min

E-022Linear Systems

The Transfer Function That Settled at 5, Not 20

The numerator says 20. The unit-step output settles at 5. The model is working exactly as written.

Transfer Function Dc Gain5–10 min

E-021Linear Systems

The RLC Circuit That Peaked Instead of Filtering

Both reactive components looked like opposition. At resonance, they canceled and the current doubled the protection limit.

Series Rlc Resonance5–10 min

E-020Linear Systems

The Capacitor That Drew Too Much Current

The steady-state current is zero. At switch-on, the circuit violates its 5 mA startup limit.

Rc Transient Initial Condition5–10 min

E-019Circuit Analysis

The Voltage Divider That Collapsed Under Load

The divider measured exactly 6 V with no load. Connect one load, and the output falls to 4 V.

Voltage Divider Loading6–10 min

E-018Circuit Analysis

The Parallel Load That Tripped the Supply

Each branch looked safe. The supply still tripped the instant the second load was connected.

Parallel Circuits6–10 min

E-017Circuit Analysis

The Circuit That Shouldn’t Have Burned

A 12 V source is connected across a required 2 Ω load. The calculated and measured current is 6 A, but the resistor overheats and fails within seconds. Identify the missing engineering check, prove the root cause, and choose a safe correction.

Electrical Power5–10 min

QUICK ANSWER

How do I practice FE Electrical & Computer questions?

Choose a topic, solve the problem before seeing the conclusion, and use the final reasoning trail to identify where your original assumption was supported or needed revision. The goal is not only to reach the answer, but to understand the engineering check behind it.