Electrical Engineering practice questions (Jahziah exam)
One worked question for each of the 5 official subject areas of Electrical Engineering, from a bank built on ETEC’s academic standards. Work them here, then practise the full set — with spaced review and timed mocks — in the app, free.
What is the main difference between linear and non-linear circuits?
Linear circuits have a predictable output response, while non-linear circuits do not
BNon-linear circuits follow a simple scaling rule, while linear circuits do not
CBoth types of circuits behave in exactly the same way.
DNone of above
WHY
Linear circuits obey the principle of superposition, so output scales proportionally with input and is predictable. Non-linear circuits do not obey superposition, so their response is not linearly proportional, matching option A.
Sample — the full set, with spaced review and mocks, is in the app.
Area 02 · Electronics
An ideal inverting op-amp has feedback resistance 89 kΩ and input resistance 10 kΩ. What is the magnitude of voltage gain?
A17.8
B4.45
C13.9
8.9
WHY
|Aᵥ| = R_f/R_in. Substituting the stated values gives 8.9. Whole-number results are given exactly; others are shown to six significant figures.
Sample — the full set, with spaced review and mocks, is in the app.
Area 03 · Electromagnetics
The dominant mode in a rectangular waveguide is TE10 because this mode has
Ano attenuation
Bno cut off
Cno magnetic field component
the highest cut off wavelength
WHY
The dominant mode is defined as the mode with the lowest cutoff frequency, which corresponds to the longest cutoff wavelength. For a rectangular waveguide, TE10 has λc = 2a, larger than any other mode, so it propagates first as frequency increases.
Sample — the full set, with spaced review and mocks, is in the app.
Area 04 · Signals & systems
Which of the following is NOT a sampling method?
Aimpulse train sampling
Bnatural sampling
Cflat-top sampling
Adaptive δ sampling
WHY
Sampling methods include ideal (impulse-train) sampling, natural sampling, and flat-top sampling. Adaptive δ modulation is a modulation scheme that quantizes a signal incrementally, not a sampling method, so it does not belong to this list.
Sample — the full set, with spaced review and mocks, is in the app.
Area 05 · Digital systems
What is the decimal equivalent of the hexadecimal number FF?
255
B256
C257
D258
WHY
Each hexadecimal digit is weighted by a power of 16, so FF = 15 × 16¹ + 15 × 16⁰ = 240 + 15 = 255. Option A gives this value.
Sample — the full set, with spaced review and mocks, is in the app.
Practise EE questions free.
Every question explains why each option is right or wrong, and brings back what you miss.