Select the option that represents the correct order of the given words as they would appear in an English dictionary. 1. Litter 2. Literature 3. Liquid 4. Light

Correct answer: 4, 3, 2, 1. In dictionary order, 'Light' comes first, then 'Liquid'. Between 'Literature' and 'Litter', 'Literature' comes earlier because 'Lite' comes before 'Litt'.

In English alphabet is assigned even numerical value beginning from A = 2, B = 4, C = 6, ... Z = 52, then what will be the total value of the letters for the word 'DESIGN'?

Correct answer: 116. Using even-number coding, D = 8, E = 10, S = 38, I = 18, G = 14, and N = 28. Their sum is 116.

Arun walks 8 km in West direction. Then he turns 90° anticlockwise. Then in which direction is he facing now?

Correct answer: South. If a person is facing west and turns 90 degrees anticlockwise, the new facing direction becomes south.

A certain number of people are sitting in a row and facing north. If Tom is sitting 2nd from the left end and 60th from the right end, then find the total number of people sitting in the row.

Correct answer: 61. Total people in the row = position from left + position from right - 1 = 2 + 60 - 1 = 61.

Five boys A, B, C, D and E are seated on a bench. A is to the immediate left of C and to the immediate right of B. B is to the immediate right of D. There are exactly two people between C and D. E is to the extreme right end of the row and to the immediate right of C. Then who is seated exactly at the middle of the row?

Correct answer: A. The only arrangement satisfying all conditions is D, B, A, C, E. So the person at the middle position is A.

Study the following arrangement and answer the question: D G H K L T Y U R S E W A X. Which of the following letters is 5th from the right end in the above arrangement?

Correct answer: S. Counting from the right gives X, A, W, E, S. Hence the 5th letter from the right is S.

Kiran is the father of Ravi. Ravi is the brother of Kavya. Then how is Kavya related to Kiran?

Correct answer: Daughter. If Ravi is Kiran's son and Ravi is Kavya's brother, then Kavya is also Kiran's child. Since Kavya is female, she is Kiran's daughter.

The sum of the ages of three friends is 188 years. What was the sum of their ages 10 years ago?

Correct answer: 158. Ten years ago, each of the three friends was 10 years younger. So the total decreases by 30, giving 188 - 30 = 158.

Complete the given series: 362, 364, __, 368, 370

Correct answer: 366. The pattern increases by 2 each time: 362, 364, 366, 368, 370.

Find the missing term in the given series: G13, H15, I17, __, K21

Correct answer: J19. The letters progress alphabetically G, H, I, J, K while the numbers increase by 2: 13, 15, 17, 19, 21.

In the given Venn diagram, Circle represents people who like Singing, Triangle represents people who like studying and Rectangle represents people who like dancing. Then find how many people like only singing?

Correct answer: 8. The region that belongs only to the circle and does not overlap with the triangle or rectangle is marked 8.

Choose the correct mirror image from the given options if the mirror is kept at XY for the word OSTRICH.

Correct answer: HCIRTSO. A vertical mirror reverses the left-right order of the letters, so the mirror image of OSTRICH is HCIRTSO.

Find out the code which can replace the question mark in the given series.

Correct answer: X above W. The pattern keeps the top letter fixed within each shape family and increases the lower letter from U to W as the figure gains one more shape. So the missing code is X above W.

Fill in the blank with the correct option. ____ Moon has hidden her face behind the cloud.

Correct answer: The. The correct article is 'The' because celestial bodies such as the Moon are normally referred to with the definite article.

Identify the proper noun from the options provided.

Correct answer: Sita. A proper noun names a specific person, place, or thing. 'Sita' is a specific name, while girl, crowd, and kindness are common or abstract nouns.

This sentence is in which tense. The boys are playing Hockey.

Correct answer: Present Continuous Tense. The verb phrase 'are playing' uses 'are' with the present participle 'playing', which indicates the present continuous tense.

Choose the correct meaning of the given idiom/phrase from the given options. 'Chase rainbows'

Correct answer: Try to achieve something that is very difficult, impossible or very desirable.. The idiom 'chase rainbows' refers to pursuing something unrealistic, unattainable, or highly idealized.

When 43 is subtracted from 40% of a number, the result is 313. Find that number.

Correct answer: 890. Let the number be x. Then 40% of x minus 43 equals 313, so 0.4x - 43 = 313. Therefore 0.4x = 356 and x = 890.

Questions: The sum of three numbers is 126 and their ratio is 1:2:3 respectively. If the sum of last two numbers is 105, the first number is:

Correct answer: 21. Let the three numbers be x, 2x, and 3x. The last two numbers sum to 5x = 105, so x = 21. Hence the first number is 21.

Four unbiased coins are tossed. What is the probability of getting exactly four heads?

Correct answer: 1/16. Exactly four heads in four coin tosses means every toss must be a head. The probability is (1/2)^4 = 1/16.

Find the area of a triangle with a base of 10 cm and a height of 5 cm.

Correct answer: 25 cm². The area of a triangle is (1/2) x base x height. So the area is (1/2) x 10 x 5 = 25 cm².

What is the value of 6! ?

Correct answer: 720. Factorial means the product of all positive integers from 1 to the given number. So 6! = 6 x 5 x 4 x 3 x 2 x 1 = 720.

Read the conclusion and then decide which of the given conclusions logically follows from the two given statements: Statements: 1. All mangoes are golden in colour. 2. No golden-coloured things are cheap. Conclusions: 1. All mangoes are cheap. 2. Golden-coloured mangoes are not cheap.

Correct answer: Only Conclusion 2 follows. All mangoes belong to the set of golden-coloured things, and no golden-coloured things are cheap. Therefore mangoes are not cheap, so only the second conclusion follows.

Refer the table and answer the question. Which of the company has highest average sales of car during the period 2009-11?

Correct answer: Honda. Average sales are Maruti: (1.25 + 1.8 + 1.95) / 3 = 1.67, Honda: (1.3 + 4.2 + 5.5) / 3 = 3.67, and Hyundai: (1.55 + 1.35 + 2.3) / 3 = 1.73. Honda has the highest average.

When the sheet of paper given in the following figure is folded to form a cube, how many dots will be there on the side opposite to the face bearing five dots?

Correct answer: 3. When the cube net is folded, the face with five dots comes opposite the face with three dots.

How does the binary number system contribute to error detection in digital communication systems?

Correct answer: By using parity bits to detect single-bit errors.. Binary communication systems commonly use parity bits as a simple error-detection method to identify single-bit errors in transmitted data.

Which Boolean law is represented by the equation A.(B+C)=(A.B)+(A.C)?

Correct answer: Distributive Law. The expression A.(B+C)=(A.B)+(A.C) shows multiplication distributed over addition, which is the distributive law of Boolean algebra.

Which of the following steps is essential in minimizing a Boolean function using a Karnaugh Map (K-Map)?

Correct answer: Plotting the minterms of the function into the K-Map and grouping adjacent 1s into powers of two.. K-Map minimization works by placing the minterms on the map and grouping adjacent 1s in sizes that are powers of two to obtain simplified expressions.

A control engineer designs a lag-lead compensator where the poles are at s = -beta/T1, -1/(beta T2) and zeros are at s = -1/T1, -1/T2. What condition is true for the parameter beta in a lag-lead compensator?

Correct answer: beta > 1. For the lag section used in a lag-lead compensator, the parameter beta is taken greater than 1 so the pole-zero placement provides the intended low-frequency gain shaping.

In a Gray Code to Binary converter, how is the Most Significant Bit (MSB) of the Binary code determined?

Correct answer: It is equal to the Most Significant Bit (MSB) of the Gray code input.. In Gray-to-binary conversion, the MSB of the binary number is copied directly from the MSB of the Gray code.

How does the triggering mechanism differ between a latch and a flip-flop in digital circuits?

Correct answer: A latch is level-triggered, while a flip-flop is edge-triggered.. Latches are sensitive to the level of an enable signal, whereas flip-flops respond only at a clock edge.

Which of the following is a primary advantage of using a Mealy machine over a Moore machine in FSM design?

Correct answer: Fewer states, mid-transition output. A Mealy machine can often realize the same behavior with fewer states because its output depends on both the present state and the input.

Which of the following best describes a situation where a bidirectional shift register would be preferred over a unidirectional shift register in a digital system?

Correct answer: Shift both ways, rotate data.. A bidirectional shift register is useful when data needs to move left or right, such as in rotate operations or reversible shifts.

Which of the following is a common application of Voltage-Controlled Oscillators (VCOs)?

Correct answer: Signal generation in frequency synthesizers. VCOs are widely used in PLLs and frequency synthesizers because their oscillation frequency can be controlled by an input voltage.

What elements are included in the frequency spectrum of an AM signal produced by a sinusoidal modulating signal?

Correct answer: Carrier and sidebands. A single-tone AM signal contains the carrier component and two sidebands located at fc + fm and fc - fm.

A team is testing various materials that are to be used in an electronic device. Team chooses one of the material having resistivity range of 50 ohm-cm. Which type of material did the team choose?

Correct answer: Semiconductor. A resistivity around tens of ohm-cm falls in the semiconductor range, between highly conductive metals and highly resistive insulators.

A semiconductor based current sensor is used for detecting small variations in electrical currents in a microchip. A total current density in a semiconductor material is to be measured. What is the total current density in a semiconductor material?

Correct answer: Drift current + Diffusion current. The total current density in a semiconductor is the sum of the drift component due to electric field and the diffusion component due to carrier concentration gradient.

Consider a photodiode with a p+ i p-n+ configuration. This construction is similar to a PIN photodiode containing two heavily doped end and two lightly doped regions. In the avalanche photodiode (APD), which of the following are the heavily and lightly regions in the device?

Correct answer: p+ and n+ are the heavily doped regions whereas i and p are lightly doped regions.. In this APD structure, the end regions p+ and n+ are heavily doped contact regions, while the intrinsic and p regions are comparatively lightly doped for depletion and avalanche operation.

For fabricating an integrated circuit (IC), which oxidation method should be chosen to achieve a faster oxidation rate creating thick silicon dioxide (SiO2) layers exceeding 1 um, while accepting a higher density of interface states?

Correct answer: Wet oxidation. Wet oxidation grows oxide faster and is preferred for thicker SiO2 layers, though it generally produces a poorer interface than dry oxidation.

In the Dual-well Process or Twin-tub Process, during Step 9, ion implantation is performed to dope the source and drain region of the PMOS and NMOS transistors. Which of the following is formed as a result of ion implantation during Step 9 of the Dual-well Process or Twin-tub Process?

Correct answer: The n+ polysilicon gate for NMOS and p+ polysilicon gate for PMOS. The dual-well process uses appropriate doping so that NMOS gets an n+ polysilicon gate and PMOS gets a p+ polysilicon gate to obtain suitable threshold characteristics.

In the fabrication of a semiconductor device using the Dual-well Process or Twin-tub Process, the first step involves depositing a thin layer of SiO2 on a p-substrate surfaced with a lightly doped p-epitaxial layer. What is the purpose of the thin SiO2 layer deposited in the first step of the Dual-well Process or Twin-tub Process?

Correct answer: It will serve as pad oxide. The initial thin oxide in such fabrication flows is typically a pad oxide used beneath masking layers to relieve stress and protect the silicon surface.

In a small-signal equivalent circuit of a diode, what is the primary parameter that determines the small-signal resistance of the diode?

Correct answer: The thermal voltage and the diode's DC operating current. The diode small-signal resistance is approximately rd = eta VT / ID, so it depends mainly on the thermal voltage and the DC bias current.

What is the primary function of the tank circuit in a sinusoidal amplifier, such as a Colpitts oscillator?

Correct answer: To select the frequency of oscillation. The LC tank circuit determines the resonant frequency and therefore sets the oscillation frequency in circuits such as the Colpitts oscillator.

What is the purpose of the Zener diode in a voltage reference circuit?

Correct answer: To provide a stable reference voltage by operating in reverse breakdown. A Zener diode is used as a voltage reference because it maintains an almost constant voltage while operating in its reverse-breakdown region.

Why is the transconductance (gm) of a MOSFET amplifier considered a key parameter?

Correct answer: It defines the rate of the change in output current corresponding a change in input voltage.. MOSFET transconductance gm measures how much the drain current changes for a given change in gate-source voltage, making it central to small-signal gain.

At low frequencies, what causes the gain of a BJT amplifier to decrease?

Correct answer: Coupling and bypass capacitors. At low frequencies, the reactance of coupling and bypass capacitors becomes significant and reduces amplifier gain.

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BEL Probationary Engineer (ECE) Question Paper May 2025 with Solutions

Practice the BEL Probationary Engineer ECE May 2025 paper with detailed solutions, answer explanations, topic-wise analysis and exam-pattern focused revision.

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BEL Probationary Engineer ECE 2025 Exam Analysis

Exam Date

May 2025

Total Questions

125

Difficulty Level

Moderate to Difficult

Technical Questions

100

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Reasoning Questions

The BEL Probationary Engineer ECE 2025 paper was moderate to difficult. The strongest technical weightage appears in Analog Electronics, Communication Systems, Control Systems, Digital Electronics, Network Analysis, so revision should prioritize formulas, circuit concepts, control-system plots, modulation basics and digital logic.

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Topic-Wise Question Distribution

Subject	Questions
Network Analysis	8
Control Systems	16
Analog Electronics	24
Digital Electronics	11
Communication Systems	18
Signals & Systems	8
Electromagnetic Theory	8

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

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The BEL PE ECE 2025 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 2025 paper contains 125 questions for practice with solutions and answer explanations.

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