Which of the following practices is considered a sustainable agricultural method to enhance soil fertility and reduce environmental impact?

Correct answer: Agroforestry. Agroforestry integrates trees with crops or livestock. It can improve soil fertility, reduce erosion, support biodiversity, and lower the environmental impact compared with intensive monoculture or overuse of chemicals.

Which institution is responsible for the promotion and development of the Hindi language in India?

Correct answer: Kendriya Hindi Sansthan (KHS). Kendriya Hindi Sansthan works for the teaching, promotion, and development of Hindi. The other options are associated with student organization, literature, or broader language studies.

Who was the first ruler of the Gupta dynasty?

Correct answer: Sri Gupta. Sri Gupta is regarded as the founder and earliest known ruler of the Gupta dynasty. Chandragupta I came later and expanded the dynasty's political importance.

The rate at which the Reserve Bank of India lends money to commercial banks in the event of any shortfall of funds is known as:

Correct answer: Repo Rate. Repo Rate is the rate at which the Reserve Bank of India lends short-term funds to commercial banks, usually against government securities. CRR and SLR are reserve requirements, while open market operations involve buying or selling securities.

Which of the following is a monosaccharide commonly found in fruits and honey?

Correct answer: Fructose. Fructose is a monosaccharide, or simple sugar, commonly present in fruits and honey. Lactose and sucrose are disaccharides, while starch is a polysaccharide.

Which of the following is a primary characteristic of a plateau?

Correct answer: Flat or gently sloping elevated area. A plateau is an elevated landform with a broad, flat or gently sloping top. It stands higher than the surrounding area and is different from river bodies, deep valleys, or climate-based regions.

Which institution was founded by Swami Dayananda Saraswati in 1875, with the aim of promoting Vedic education and opposing idol worship?

Correct answer: Arya Samaj. Arya Samaj was founded by Swami Dayananda Saraswati in 1875. It promoted Vedic teachings, social reform, and opposition to idol worship.

Who captained the Indian women's hockey team that participated at the Tokyo 2020 Summer Olympics?

Correct answer: Rani Rampal. Rani Rampal captained the Indian women's hockey team at the Tokyo 2020 Summer Olympics, where the team reached the semifinals.

Which of the following is NOT a pillar of sustainable development as outlined by the Brundtland Commission?

Correct answer: Environmental balance. The provided answer key marks environmental balance for this question. In standard sustainability discussions, the main pillars are commonly framed around economic, social, and environmental dimensions.

Which of the following is a characteristic feature of the Animal Kingdom?

Correct answer: Heterotrophic nutrition. Animals are multicellular eukaryotes that obtain food from other organisms, so heterotrophic nutrition is a characteristic feature of the Animal Kingdom.

Which of the following is a power exclusive to the State Government in India?

Correct answer: Police. Police is a State List subject under the Indian Constitution, while defense, currency and coinage, and foreign affairs fall under Union powers.

Which article of the Indian Constitution deals with Indian Citizenship?

Correct answer: Article 11. Article 11 empowers Parliament to regulate the right of citizenship by law. Citizenship provisions are covered in Part II of the Indian Constitution.

Four letter-clusters have been given, out of which three are alike in some manner and one is different. Select the odd letter-cluster.

Correct answer: MKL. In IHG, TSR, and ONM, the letters move backward consecutively in the alphabet. MKL does not follow the same continuous reverse order.

Select the option that is related to the third number in the same way as the second number is related to the first number. 5 : 130 :: 7 : ?

Correct answer: 350. The relation is n cubed plus n: 5^3 + 5 = 130. Applying the same relation, 7^3 + 7 = 350.

If A denotes addition, B denotes division, and D denotes subtraction, then what will be the value of the following equation? 16 B 4 D 2 A 3 = ?

Correct answer: 5. Replacing the symbols gives 16 / 4 - 2 + 3 = 4 - 2 + 3 = 5.

Six girls Ananya, Priya, Sneha, Nisha, Riya, and Kavya are sitting around a circular table facing away from the centre. Sneha is sitting to the left of Riya. Ananya is sitting third to the right of Kavya. Sneha is not sitting adjacent to Kavya. Nisha sits to the immediate right of Priya. Who sits to the immediate left of Ananya?

Correct answer: Nisha. Arranging the six girls around the circular table according to the given conditions places Nisha immediately to the left of Ananya.

Which of the following letter clusters will replace the question mark (?) in the given series? AE, CG, EI, GK, ?

Correct answer: IM. Both letters in each pair move two positions forward: AE, CG, EI, GK, so the next pair is IM.

तस्वीर में एक आदमी की ओर इशारा करते हुए एक लड़की कहती है, "वह मेरे पिता के इकलौते भाई का पिता है।" लड़की का पुरुष से क्या संबंध है?

Correct answer: बेटे की बेटी. पिता के इकलौते भाई का पिता लड़की के दादा होंगे। इसलिए लड़की उस पुरुष के बेटे की बेटी है।

Which of the following numbers will replace the question mark (?) in the given series? 6, 12, 24, 48, ?, 192

Correct answer: 96. Each number is doubled to get the next term: 6, 12, 24, 48, 96, 192.

There are 120 students in a competition. If Aisha ranks 95th from the bottom, what is her rank from the top?

Correct answer: 26. Rank from the top = total students - rank from the bottom + 1 = 120 - 95 + 1 = 26.

Select the option that is related to the third study of body parts in the same way as the second study is related to the first study. Skin : Dermatology :: Joints : ?

Correct answer: Arthrology. Dermatology is the study of skin. Similarly, arthrology is the study of joints.

Which two numbers should be interchanged to make the given equation correct? 12 ÷ 4 × 6 - 2 + 3 = 26

Correct answer: 3 and 4. Interchanging 3 and 4 gives 12 ÷ 3 × 6 - 2 + 4 = 24 - 2 + 4 = 26.

Three statements are given followed by two conclusions numbered I and II. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements. Statement I: Some roses are red. Statement II: All red things are colourful. Statement III: Some colourful things are flowers. Conclusion I: Some colourful things are roses. Conclusion II: Some flowers are red.

Correct answer: Only conclusion I follows. Since some roses are red and all red things are colourful, it follows that some colourful things are roses. The statements do not prove that any flower is red.

Which of the following numbers will replace the question mark (?) in the given series? 12, 6, 18, 9, ?

Correct answer: 27. The pattern alternates division by 2 and multiplication by 3: 12 ÷ 2 = 6, 6 × 3 = 18, 18 ÷ 2 = 9, 9 × 3 = 27.

In a certain code language, if CAR is coded as 22, BUS is coded as 42, then what will TRAIN be coded as?

Correct answer: 62. Using alphabet positions, CAR = 3 + 1 + 18 = 22 and BUS = 2 + 21 + 19 = 42. TRAIN = 20 + 18 + 1 + 9 + 14 = 62.

The number of branches of the root locus is equal to ________ of the open-loop transfer function.

Correct answer: the number of poles. The number of root locus branches is equal to the number of open-loop poles.

Which of the following is correct in regards with Fermi level in semiconductors at 0 Kelvin?

Correct answer: The Fermi level in intrinsic semiconductors lies between conduction band and valence band. For an intrinsic semiconductor, the Fermi level lies approximately midway between the conduction band and valence band.

What is the main advantage of Double-sideband suppressed-carrier (DSB-SC) modulation over conventional AM?

Correct answer: Lower power consumption. In DSB-SC modulation, the carrier is suppressed, so less transmitted power is wasted in the carrier compared with conventional AM.

What is the main characteristic that distinguishes white noise from other types of noise?

Correct answer: Its constant power spectral density. White noise has a constant power spectral density over frequency, which distinguishes it from many other noise types.

In a digital communication system, increasing the SNR (Signal to Noise Ratio) will:

Correct answer: Decrease the bit error rate. A higher SNR means the signal is stronger relative to noise, so detection becomes more reliable and the bit error rate decreases.

In a 2-port network, if Y11 is the short-circuit input admittance, then the Y21 parameter represents:

Correct answer: Short-circuit forward current transfer ratio. For Y-parameters, Y21 is the forward transfer admittance/current transfer parameter under short-circuit conditions.

In a closed-loop system, what is the primary purpose of the integral controller (Ki)?

Correct answer: To reduce the steady state error.. Integral control accumulates error over time and is mainly used to reduce or eliminate steady-state error.

Which factor does not significantly affect the line-of-sight communication range?

Correct answer: Modulation scheme. Line-of-sight range is primarily affected by antenna height, propagation conditions, and frequency-related propagation effects. The modulation scheme does not significantly determine the geometric line-of-sight range.

The Continuous Time Fourier Series (CTFS) of a periodic signal can be represented as:

Correct answer: A series of sine and cosine terms. A periodic continuous-time signal can be represented by a Fourier series as a sum of harmonically related sine and cosine components.

Which of the following indicates the operation of a BJT in saturation region?

Correct answer: Vce 0, and Ic > 0; Vbe >= 0.7V. A silicon BJT in saturation has both junctions forward biased, base and collector currents present, and a low collector-emitter voltage, typically around 0.2 V or less.

Which of the following is a necessary condition for Routh-Hurwitz Stability?

Correct answer: All the coefficients of its characteristic polynomial should be positive.. A necessary condition for stability is that all coefficients of the characteristic polynomial have the same sign and are non-zero; for the usual normalized form, they should be positive.

Which of the following is the hexadecimal equivalent of the octal number 7532?

Correct answer: F5A. Convert octal 7532 to binary: 111 101 011 010. Grouping into nibbles gives 1111 0101 1010, which is hexadecimal F5A.

Compute the DFT of the following sequence: x = [j, 0, j, 1]

Correct answer: [1+2j, j, -1+2j, -j]. Evaluating the 4-point DFT of x = [j, 0, j, 1] gives the option marked in the paper answer key: [1+2j, j, -1+2j, -j].

What is the characteristic impedance of a coaxial transmission line having inner conductor radius of 1 mm, outer conductor radius of 3 mm and dielectric constant of 9.0?

Correct answer: 21.97 Ω. For a coaxial line, Z0 = (60 / sqrt(er)) ln(b/a). With er = 9, b/a = 3, Z0 = 20 ln(3) ≈ 21.97 ohms.

The response of a circuit immediately after the input is suddenly applied, is called:

Correct answer: Transient response. The immediate response after a sudden input is the transient response, which exists before the circuit reaches steady state.

In TDMA, what is the purpose of the guard time between time slots?

Correct answer: To compensate for propagation delay differences.. Guard time in TDMA separates adjacent time slots and prevents overlap caused by propagation delay differences between users.

Find the maximum power that can be delivered to the load resistor RL of the circuit shown in the official PDF figure.

Correct answer: 250/3 W. For maximum power transfer, RL equals the Thevenin resistance seen at A-B. The circuit gives VTh = 200/3 V and RTh = 40/3 ohms, so Pmax = VTh^2 / (4RTh) = 250/3 W.

In the context of digital communications, what is the primary benefit of using a matchedfilter?

Correct answer: It reduces inter-symbol interference.. The marked BEL answer selects the matched-filter benefit as reducing inter-symbol interference for the received digital pulse decision.

For the circuit shown in the official PDF figure, determine the Thevenin equivalent circuit.

Correct answer: ZTh = 4 ohms, VTh = 8 V. The marked BEL response identifies the Thevenin equivalent at terminals A-B as VTh = 8 V with ZTh = 4 ohms.

The Fourier Transform of a rectangle function is:

Correct answer: sinc function. A rectangular pulse in one domain transforms to a sinc-shaped function in the Fourier domain.

How many satellite signals are required to calculate a precise 3D position using GPS?

Correct answer: 4. A GPS receiver needs four satellite signals to solve for three spatial coordinates and the receiver clock offset.

BEL ECE PYQ

BEL Probationary Engineer (ECE) Question Paper December 2023 with Solutions

Practice the BEL Probationary Engineer ECE December 2023 paper with detailed solutions, answer explanations, topic-wise analysis and exam-pattern focused revision.

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BEL ECE Details

125

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BEL Probationary Engineer ECE 2023 Exam Analysis

Exam Date

December 2023

Total Questions

125

Difficulty Level

Moderate to Difficult

Technical Questions

100

Aptitude Questions

Reasoning Questions

The BEL Probationary Engineer ECE 2023 paper was moderate to difficult. The strongest technical weightage appears in Analog Electronics, Communication Systems, Control Systems, Digital Electronics, Signals & Systems, so revision should prioritize formulas, circuit concepts, control-system plots, modulation basics and digital logic.

Topic-Wise Weightage

Topic-Wise Question Distribution

Subject	Questions
Network Analysis	6
Control Systems	9
Analog Electronics	17
Digital Electronics	9
Communication Systems	16
Signals & Systems	9
Electromagnetic Theory	5

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Thevenin Theorem Norton Theorem BJT MOSFET Op-Amp Root Locus Bode Plot Modulation Sampling Digital Logic

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What is the difficulty level of BEL PE 2023?

The BEL PE ECE 2023 paper is best treated as moderate to difficult, with a mix of technical ECE, aptitude and reasoning questions.

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This BEL Probationary Engineer ECE 2023 paper contains 125 questions for practice with solutions and answer explanations.

Is BEL PE suitable for ECE students?

Yes. BEL Probationary Engineer Electronics/ECE papers strongly overlap with core ECE subjects such as networks, analog, digital, control, communication, signals and electromagnetic theory.

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Important BEL PE ECE areas include Analog Electronics, Communication Systems, Control Systems, Digital Electronics, along with reasoning and aptitude practice.

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