Electronics and Communication Engineering MCQ for NEC Licence and Lok Sewa: Free Mock Test

Electronics and Communication Engineering MCQ: NEC Licence and Lok Sewa

160 questions with answers. Mock tests, practice by topic and progress tracking.

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Free practice by EngineeringNepal.com.np. Questions are written and checked by our team; always confirm the current exam format in the official notice.

Electronics and communication engineering MCQ: what this set covers

This page is for graduates preparing for the Nepal Engineering Council (NEC) registration exam in electronics and communication engineering (AExE syllabus). The questions also suit Lok Sewa Aayog and provincial Public Service Commission engineer posts, and the written technical tests that telecom and other public bodies set when hiring engineers.

Every question has four options, a marked answer and a short explanation. Numerical questions show the working step by step. Questions are written and checked by our team; ones based on past exams are reworded, not copied. Always confirm the exam format in the official notice for your session.

How the NEC electronics and communication licence exam works

The NEC syllabus for this branch has 10 chapters, each split into 6 sub-sections, giving 60 sub-sections in total. Chapter 10, Project planning, design and implementation, is common to all engineering branches. The model question sets NEC published in November 2025 contain 100 one-mark questions. Exams up to 2023 used 60 one-mark and 20 two-mark questions in 2 hours, with a pass mark of 50 percent. Always confirm the pattern in the notice for your session.

The NEC mock on this page is a timed two-hour paper that draws questions from every sub-section of all ten chapters. The Lok Sewa set is 50 questions with 20 percent negative marking. For the full sub-section list, read our NEC electronics and communication syllabus (AExE).

Chapters in this question bank

Basic electrical and electronics - circuit theorems, AC circuits, diodes, transistors and op-amps.
Digital logic and microprocessor - number systems, Boolean algebra, combinational and sequential circuits, microprocessor architecture and instructions.
Programming language and its applications - C programming, functions, pointers and object-oriented concepts.
Computer organization and embedded system - CPU design, memory, I/O and embedded systems.
Computer network and network security - OSI and TCP/IP layers, addressing, routing and security.
Electromagnetic waves and propagation - fields, Maxwell's equations, plane waves, waveguides, antennas and radio wave propagation.
Communication system - signals and noise, Hilbert transform, AM, FM and PM, digital modulation, PCM, information theory and random noise.
Signal, system and digital signal processing - Fourier analysis, LTI systems, sampling, z-transform, DFT and FFT, and IIR and FIR filter design.
Wireless and telecommunication system - cellular concepts, fading, spread spectrum, multiple access, switching, traffic engineering and Erlang, the ITU and the Nepal Telecommunications Authority, and frequency allocation.
Project planning, design and implementation - common to all branches; the mock pulls chapter 10 questions from our engineering economics, planning and professional practice MCQ bank.

How to use this page

Mock tests - take the timed NEC paper or the Lok Sewa set, then review every explanation.
Practice by topic - work through one chapter untimed.
My progress - see your scores and weak chapters. Progress stays in this browser, so use the same device.

The bank grows regularly and new questions appear automatically.

Study tips for electronics and communication engineers

Expect many numericals in chapters 6 to 9. These branch-specific chapters reward formula practice more than reading.
Know the communication results by heart. AM total power is Pc(1 + m squared/2), so with m = 1 the sidebands carry only one third of the power. FM bandwidth by Carson's rule is 2(delta f + fm). PCM bit rate is n times fs, and each extra bit adds about 6 dB of SQNR. Shannon capacity is C = B log2(1 + S/N), with S/N as a ratio, not in dB.
Learn the field and antenna constants. Free-space intrinsic impedance is about 377 ohm (120 pi). A half-wave dipole has radiation resistance near 73 ohm. The TE10 cut-off in a rectangular guide is c/2a, and inside a guide the phase velocity exceeds c while group velocity is below c.
In DSP, count operations and check the ROC. A direct N-point DFT needs N squared complex multiplications; a radix-2 FFT needs (N/2)log2 N. A causal system's ROC lies outside the outermost pole, and it is stable only if that ROC includes the unit circle. Bilinear transformation avoids aliasing but warps the frequency axis; impulse invariance keeps a linear frequency mapping but suffers aliasing, so it suits only low-pass and band-pass filters.
Practise the cellular and traffic formulas. Traffic in Erlang is call rate times average holding time. Cluster size is N = i squared + ij + j squared, and the co-channel reuse ratio is D/R = square root of 3N.
Do not neglect chapters 1 to 5. They match the computer engineering paper and offer quick marks on logic, C and networking.
Manage time and negative marking. In the two-hour NEC paper, finish the quick theory questions first and return to long numericals. With 20 percent negative marking in Lok Sewa, even a blind guess among four options has a small positive expected score (0.25 - 0.75 x 0.2 = 0.1 of the question's marks), and eliminating one or two options makes an attempt clearly worthwhile.

Common mistakes in the electronics and communication paper

Putting S/N in dB straight into Shannon's formula instead of converting it to a power ratio first.
Mixing up bit rate and baud rate: in M-ary signalling the baud rate is the bit rate divided by log2 M.
Taking the Nyquist rate as fmax instead of 2fmax.
Forgetting that the Hilbert transform shifts positive frequencies by -90 degrees, so the Hilbert transform of cos is sin, not -sin.
Confusing dB with dBm, or adding gains as ratios when they are given in dB.

Frequently asked questions

How many questions are in the electronics and communication bank?

The bank starts with about 160 questions and grows every week.

Does it follow the latest NEC syllabus?

Yes. The chapters and sub-sections follow the current NEC AExE syllabus, and the mock samples every sub-section.

Is it free?

Yes. All mocks and topic sets are free, with no sign-up needed.

How does it relate to the computer engineering page?

Chapters 1 to 5 are the same as in the computer engineering (ACtE) syllabus, so practice on either page helps for both. Chapters 6 to 9 are specific to this branch, and chapter 10 is shared by every branch.