BEL PYQ Probationary Engineer, Trainee Engineer & Deputy Engineer 2026 Download PDF (2023-2026, All Branches): BEL All Branches Previous Year Official Question Paper PDF Download

Directions (Questions 1-12): Read the following passages carefully to answer the questions that follow.

Passage-I

We all know what posters are. In these modern days of advertising, there is scarcely a road along which we travel without passing one or other examples of the poster adviser’s activity. These posters vary in type from illuminated, electric signs with their flashing, alternating lights, to the small hand-painted effusions which advertise local concerts in the village halls. Before we attempt a detailed study of the methods by which poster hoardings are filled with eye-catching designs, let us examine one or two basic principles which would apply to any well-planned poster campaign. In the place we must appreciate that our poster will be read, in most cases, by a mobile public. It differs from the press advertisements in that it is not carried into the home or office and read at leisure. It remains in one place, and its message, therefore, must be capable of being assimilated by the reader who is passing, often in a hurry, with other and more important business in his mind. Again, unlike the press advertisement, the poster cannot carry a long and detailed message: the man in the street has not sufficient time to read it in these days of haste and bustle.

(1) does not give the details of the message.
(2) conveys the message to a large section of people.
(3) entertains and also informs people.
(4) beautifies the place where it is put up.

(1) It reaches far and wide.
(2) It is a cheaper mode of communicating the message.
(3) It does not require illustrations or eye-catching pictures.
(4) The reader can assimilate the details as per his ease and convenience.

(1) because it is often read in a hurry.
(2) so that it can be retained for long.
(3) because it is often read from a distance.
(4) so as to impress the reader.

Passage-II

To emancipate woman and make her the equal of man remains an impossibility so long as the woman is shut out from socially productive labour and restricted to private domestic labour. The emancipation of woman will only be possible when she can take part in production on a large social scale and domestic work no longer claims anything but an insignificant amount of her time. And only now has that become possible through modern large-scale industry which does not merely permit the employment of female labour over a wide range but positively demands it.

(1) Doing their household chores    (2) Working in others’ homes
(3) Working in offices    (4) Working in small-scale enterprises

(1) The industry owners genuinely need female labour.
(2) The female workers prefer to work in large-scale factories.
(3) The female workers demand high wages to work in large-scale industries.
(4) The industry owners demand more employment for women from the Government.

Directions (Questions 13-14): In the given questions, complete the series by replacing ‘?’ from the given answer options. निर्देश (प्रश्न 13-14): दिए गए प्रश्न में, दिए गए उत्तर विकल्पों में से ‘?’ को प्रतिस्थापित करके श्रृंखला को पूरा करें।

Directions (Questions 15-16): In the given questions, find the odd one out. निर्देश (प्रश्न 15-16): दिए गए प्रश्न में से विषम को ज्ञात कीजिए।

Directions (Questions 17-19): Study the given information carefully to answer the following questions. निर्देश (प्रश्न 17-19): निम्नलिखित प्रश्नों के उत्तर देने के लिए दी गई जानकारी का ध्यानपूर्वक अध्ययन करें।

There are eight members in a family namely A, B, C, D, K, L, M and N in which there are two married couples. Among the eight members, there are two lawyers and two artists. D is the daughter-in-law of M. L is the brother of any of the two artists. N, who is the artist, is the sister of A. No female is a lawyer. D is an artist. C is the husband of M. K is the only son of M. B is the lawyer and is the brother of C. A is the lawyer and is the son of K. एक परिवार में आठ सदस्य हैं, जिनके नाम A, B, C, D, K, L, M और N हैं। परिवार में दो विवाहित जोड़े हैं। इन आठ सदस्यों में से दो वकील और दो कलाकार हैं। D, M की बहू है। L, दोनों कलाकारों में से किसी एक का भाई है। N, जो एक कलाकार है, A की बहन है। परिवार में कोई भी महिला, वकील नहीं है। D एक कलाकार है। C, M का पति है। K, M का इकलौता पुत्र है। B एक वकील है और C का भाई है। A एक वकील है और K का पुत्र है।

किसका पेशा निर्धारित नहीं किया जा सकता? (1) A (2) B (3) K (4) इनमें से कोई नहीं

परिवार में कितनी महिला सदस्य हैं? (1) 3 (2) 4 (3) 5 (4) 6

M के पोते कौन होंगे? (1) D, A (2) N, K (3) A, K (4) इनमें से कोई नहीं

(1) उत्तर-पश्चिम (2) उत्तर-पूर्व (3) दक्षिण-पूर्व (4) दक्षिण-पश्चिम

(1) भतीजा (2) चचेरा भाई (3) चाचा (4) भाई

(1) 11 (2) 8 (3) 3 (4) इनमें से कोई नहीं

(1) There are two kinds of computer memory: primary and secondary.
(2) The computer can understand decimal systems also.
(3) The storage of program and data in the RAM is permanent.
(4) PROM is secondary memory.

कंप्यूटर सिस्टम के बारे में निम्नलिखित में से कौन सा कथन सही है? (1) कंप्यूटर मेमोरी दो प्रकार की होती है: प्राथमिक और द्वितीयक। (2) कम्प्यूटर दशमलव प्रणाली को भी समझ सकता है। (3) RAM में प्रोग्राम और डेटा का स्टोरेज स्थायी होता है। (4) PROM सेकेंडरी मेमोरी है।

इंटरनेट पर जब हम वांछित जानकारी की तलाश में या किसी विशेष कार्य को पूरा करने के लिए एक पृष्ठ से दूसरे पृष्ठ पर जाते हैं, तो इसे ____________ कहा जाता है। (1) वेब खोज (2) साइट की खोज करना (3) वेब ब्राउज़िंग (4) इनमें से कोई नहीं

(1) There is a grammatical error in the text contained in the cell.
(2) There is a spelling mistake in the text contained in the cell.
(3) The user has linked a comment to that cell.
(4) The cell content is a hyperlink to another program.

एमएस एक्सेल में, सेल के ऊपरी दाएं कोने पर एक लाल त्रिकोण क्या दर्शाता है? (1) सेल में निहित पाठ में व्याकरण संबंधी त्रुटि है। (2) सेल में मौजूद टेक्स्ट में वर्तनी की गलती है। (3) उपयोगकर्ता ने एक टिप्पणी को उस सेल से लिंक किया है। (4) सेल सामग्री किसी अन्य प्रोग्राम का हाइपरलिंक है।

(1) Adds up cell values based on a condition.   (2) Adds all the numbers in a range of cells.
(3) Returns a subtotal in a list or database.   (4) All these

(1) Machining allowance   (2) Shrinkage allowance
(3) Distortion allowance   (4) Shaking (Rapping) allowance

(1) By width of small letters   (2) By height of capital letters
(3) By thickness of letter lines   (4) By gap between two words

(1) Horizontal Trace (HT)   (2) Vertical Trace (VT)
(3) Oblique Trace (OT)   (4) Perpendicular Trace (PT)

(1) The entire screen must be erased to change anything
(2) The picture flickers a lot at high resolution
(3) The picture disappears automatically after few seconds
(4) DVST mainly supports smooth animation

(1) Absolute positioning   (2) Incremental positioning
(3) Fixed zero   (4) Floating zero

(1) In round brackets (uvw)   (2) In curly brackets {uvw}
(3) In square brackets [uvw]   (4) In angle brackets ⟨hkl⟩

(1) Battery boost   (2) Changing magnetic field
(3) Distributor rotation   (4) Fuel entry

(1) Flaws do not amplify stress much in compression
(2) Flaws increase stress more in compression only
(3) Ceramics show high plastic deformation in tension
(4) Ceramics have no microscopic flaws at all

(1) One side of the parallelogram   (2) Diagonal of the parallelogram
(3) Area of the parallelogram   (4) Perimeter of the parallelogram

(1) Same line of action   (2) Same plane surface
(3) Same centre point   (4) Same direction only

(1) Incompletely constrained motion   (2) Successfully constrained motion
(3) Completely constrained motion   (4) Unrestricted constrained motion

(1) Sum of shortest and longest link is greater than other two links
(2) Sum of shortest and longest link is not greater than other two links
(3) Sum of shortest and longest link equals the shortest link
(4) Sum of shortest and longest link is less than one link only

(1) Piezometer   (2) U-tube manometer
(3) Bourdon tube gauge   (4) Bellows gauge

(1) Copy a path in bigger/smaller size   (2) Change speed of two rotating shafts
(3) Measure force between two links   (4) Stop motion of a four bar system

(1) Gas molecules have stronger hydrogen bonds than liquid
(2) Brownian motion stops molecules from moving in liquid
(3) Dust particles always push molecules towards the gas
(4) Liquid molecules are packed closer than gas molecules

(1) Tensile force per unit length on a liquid surface
(2) Mass per unit volume of a liquid
(3) Resistance of a liquid to flow
(4) Force per unit area in a fluid

(1) Working Stress / Ultimate Stress   (2) Ultimate Stress / Working Stress
(3) Yield Stress / Ultimate Stress   (4) Ultimate Stress / Yield Stress

(1) Shaft material is non-uniform
(2) Twist along the shaft is uniform
(3) Shaft cross-section becomes oval after twist
(4) Diameter of shaft changes during torsion

(1) Mechanical, Chemical and Thermal equilibrium
(2) Thermal equilibrium
(3) Mechanical equilibrium
(4) Chemical equilibrium

(1) Same temperature means thermal equilibrium
(2) Heat flows from cold to hot
(3) Pressure is proportional to volume
(4) Work is always equal to heat

(1) Motion of each molecule   (2) Average force/area
(3) Molecular collisions   (4) Property measured by a gauge

(1) Pressure is same on all sides, so no net force
(2) Pressure is more at the bottom than at the top
(3) Only atmospheric pressure pushes it up
(4) Liquid pulls the body upward due to friction

(1) Friction losses are considered   (2) Compression takes place in many cylinders
(3) Working fluid behaves as a perfect gas   (4) There is a pressure drop in delivery valves

(1) Lower compression ratio   (2) Higher compression ratio
(3) Better heat transfer   (4) Spark plug stops working

(1) Heat is added from the walls   (2) Heat is lost to the walls
(3) No heat transfer takes place   (4) Heat transfer changes every second

(1) By passing heavy current through the contact area
(2) By using a flame to heat the plates before pressing
(3) By adding filler metal to melt and join the plates
(4) By applying flux to create heat at the joint

(1) Chemical reaction gives heat   (2) Arc welding with flux and filler
(3) Reaction absorbs heat   (4) Slag sinks, iron floats

(1) To make the sand stronger and harder
(2) To increase the mould cavity size
(3) To let gases escape during pouring and solidifying
(4) To increase the metal pouring speed

(1) Balls move outward and sleeve moves upward
(2) Balls move inward and sleeve moves downward
(3) Balls move inward and sleeve moves upward
(4) Balls move outward and sleeve moves downward

(1) Crankshaft slows down   (2) Crankshaft speeds up
(3) Crankshaft stops   (4) Torque becomes zero always

(1) Limiting strength from simple tension test
(2) Maximum shear stress value
(3) Distortion energy (von Mises) value
(4) Zero principal stress

(1) Longitudinal vibration   (2) Transverse vibration
(3) Rotary vibration   (4) Torsional vibration

(1) Load line passes through centroid, so rivets share load equally
(2) Load line misses the rivet-group centroid, so rivets are not equally loaded
(3) Only direct shear acts, so no twisting effect is produced
(4) Eccentricity e is the distance between two rivets

(1) Thermodynamics gives cooling time; heat transfer gives total heat only
(2) Thermodynamics gives total heat; heat transfer gives cooling time/rate
(3) Both give cooling time without needing any rate information
(4) Heat transfer applies only at equilibrium states

(1) Heat flux through the wall   (2) Thermal resistance of the wall
(3) Thermal conductance of the wall   (4) Temperature difference across the wall

(1) Thermal similarity and chemical similarity
(2) Electrical similarity and magnetic similarity
(3) Geometric similarity and material similarity only
(4) Dimensional similarity and dynamic similarity

(1) Ball has a large temperature gradient from centre to surface
(2) Heat loss is mainly by radiation, so h is not needed
(3) Ball temperature stays almost uniform inside at any time
(4) Fluid temperature is not uniform because stirring is poor

(1) Forced convection (air moved by fan/pump)
(2) Natural (free) convection (buoyancy due to density change)
(3) Radiation (heat transfer without contact)
(4) Conduction (heat transfer without fluid motion)

(1) Stores electrical charge   (2) Opposes/restricts current flow
(3) Increases current flow   (4) Produces magnetic field

(1) It gives a fixed voltage
(2) It is a dependent current source
(3) It is a dependent voltage source
(4) It is a resistor symbol used to drop voltage

(1) Density of fluid (ρ)   (2) Plate area (A) only
(3) Velocity gradient (du/dy)   (4) Film thickness (h) only

(1) Eccentric bearing (large offset of shaft)
(2) Concentric bearing (very small eccentricity)
(3) Dry bearing (no oil in clearance)
(4) Leaky bearing (side leakage is large)

(1) Inlet temperature of lubricant   (2) Outlet temperature of lubricant
(3) Average of inlet and outlet temperatures   (4) Ambient air temperature

(1) High carbon steel   (2) High speed steel
(3) High carbon medium alloy steel   (4) Cemented carbide

(1) Convert heat to work and store energy in flywheel
(2) Increase tool hardness and reduce cutting temperature
(3) Transmit motion and convert rotary to reciprocating motion
(4) Measure brake power and calculate specific fuel consumption

(1) Compound rest method (steep short taper, internal)
(2) Compound rest method (small taper, long job, external)
(3) Tailstock set-over method (steep short taper, internal)
(4) Tailstock set-over method (small taper, long job, external)

(1) Tangent vectors that fix the curve   (2) Grid points used only for scaling
(3) Control points that shape the curve   (4) Midpoints where the curve must pass

(1) Operation steps and machine details   (2) Drawing sizes only
(3) Inspection steps only   (4) Tool material data

(1) Input translation unit   (2) Arithmetic calculation unit
(3) Cutter offset unit   (4) Post processor unit

(1) From punched tape at machine   (2) From central computer memory
(3) By manual data entry only   (4) From machine’s own storage

(1) Take mean value and find standard deviation
(2) Do calibration using primary standard
(3) Multiply by scale factor
(4) Use tolerance limits to correct readings

(1) Indirect method   (2) Direct method
(3) Comparative method   (4) Transposition method

(1) Because gravity acts only at the upper end of the spring
(2) Because weight is balanced by spring force at static equilibrium
(3) Because spring stiffness k becomes zero at rest
(4) Because acceleration due to gravity is neglected

(1) Fundamental frequency is the highest
(2) Higher natural frequencies are larger than fundamental frequency
(3) Exact matrix solution gives frequency
(4) Stiffness matrix is taken as zero

(1) To increase compression ratio
(2) Because valve motion is gradual over many crank degrees
(3) Because suction and exhaust strokes are shorter
(4) To avoid using a cam mechanism

(1) Swept volume / Actual volume of charge at atmospheric condition
(2) Actual volume of charge at atmospheric condition / Swept volume
(3) Brake power / Indicated power
(4) Fuel flow rate / Air flow rate

(1) Effect of dissociation   (2) Actual composition of cylinder gases
(3) Variation of specific heat with temperature   (4) Variation in number of molecules

(1) Ladder frame; cage-like safety   (2) Monocoque; low rigidity
(3) Ladder frame; low-volume costly   (4) Monocoque; cage-like safety

(1) Power to two wheels; more grip   (2) Power to all wheels; less weight
(3) Power to two wheels; all wheels drive   (4) Power to all wheels; less mileage

(1) Clearance volume is above piston at TDC
(2) Bore is piston travel from TDC to BDC
(3) Stroke is inside diameter of cylinder
(4) Swept volume is volume above piston at TDC

(1) Keep suction line perfectly horizontal
(2) Keep minimum gas/flow velocity in the circuit
(3) Reduce gas velocity so oil settles safely
(4) Use oil drainage pots for all refrigerants

(1) To reduce gas pulsations in the line   (2) To measure oil level in the compressor
(3) To increase pressure in suction line   (4) To show condensing/evaporating temp from saturation

(1) Stress is directly proportional to strain   (2) Stress is inversely proportional to strain
(3) Stress is equal to strain   (4) Stress does not depend on strain

(1) Mmax = −PL at x = L (fixed end)   (2) Mmax = +PL at x = L (fixed end)
(3) Mmax = −P(L−x) at free end   (4) Mmax = 0 at fixed end

(1) Heat can flow from cold to hot without work input
(2) No device can convert all heat from a single source into work
(3) Heat cannot be transferred at constant temperature
(4) Work can be completely converted into heat

(1) Heat flows toward increasing temperature
(2) Heat flows in direction of negative temperature gradient
(3) Thermal conductivity k is always negative
(4) Area A decreases heat flow

(1) It reduces as it moves away from the point
(2) It transmits equally to all parts and container walls
(3) It acts only in the downward direction
(4) It acts only on the fluid, not on the walls