Railway-RRB ALP 2025 CBT 2 Heat Engine Previous Year Question Paper and Answer Key Free PDF Download English -Jul 28, 2026
रेल भर्ती बोर्ड / RAILWAY RECRUITMENT BOARDS
CEN - 01/2025 | सहायक लोको पायलट की भर्ती
Recruitment of Assistant Loco Pilot (ALP)
CBT Stage-2 | Heat Engine Trade | Question Paper with Answer Key
Test Date: 28/07/2026 | Test Time: 9:30 AM – 12:00 PM | Shift-1
Note: Correct Answer = 1 mark | Incorrect = −1/3 mark. Bold ✓ indicates official correct option.
PART-A (Common Section)
Questions 1 – 100 (Detailed + Quick Key)
Q.1 A conical tent has a base radius of 14 m and a height of 48 m. How many cubic meters of air can it hold? (Use π = 22/7)
A. 9865
B. 9568
C. 8956
D. 9856 ✓
Correct Answer: D
Q.2 When a moving car suddenly applies brakes, its kinetic energy is transformed mainly into which form of energy?
A. Heat energy ✓
B. Potential energy
C. Light energy
D. Sound energy
Correct Answer: A
Q.3 A father distributed two different amounts among his sons P, Q, R and S. First amount was distributed in the ratio 5 : 4 : 3 : 2 and the second amount was distributed in the ratio 6 : 7 : 8 : 9. If the second amount is thrice the first amount, then which son will get the maximum amount?
A. R
B. S ✓
C. P
D. Q
Correct Answer: B
Q.4 A roller coaster at the top of its track has maximum potential energy. As it descends and speeds up, what principle explains why the sum of its kinetic and potential energies remains constant if we ignore friction and air resistance?
A. Principle of superposition
B. Law of inertia
C. Law of conservation of energy ✓
D. Principle of inertia
Correct Answer: C
Q.5 What is the typical temperature range covered by a laboratory thermometer used in school experiments?
A. Thirty five to forty two degrees Celsius
B. Zero to two hundred degrees Celsius
C. Minus ten to one hundred and ten degrees Celsius ✓
D. Minus fifty to fifty degrees Celsius
Correct Answer: C
Q.6 What is the primary function of a fire hydrant in a workplace safety system?
A. Supplying large quantities of water to fight fires ✓
B. Detecting smoke and warning employees
C. Activating fire alarms automatically in emergencies
D. Removing hazardous fumes from the area
Correct Answer: A
Q.7 If 'A' stands for '+', 'B' stands for '−', 'C' stands for '×' and 'D' stands for '÷', then what will come in place of the question mark (?) in the following equation? 31 B 35 D 7 A 9 C 2 = ?
A. 48
B. 42
C. 44 ✓
D. 46
Correct Answer: C
Q.8 What will be the code for the following group? + 6 $ 2 7 (coding-decoding)
A. STMWV
B. WSNYT
C. TSNWV
D. WRNYT ✓
Correct Answer: D
Q.9 Which of the given options follows the same set of operations as in the given sets? 10 − 100 − 50 − 25 ; 2 − 4 − 2 − 1
A. 8 − 64 − 32 − 14
B. 5 − 25 − 15 − 7
C. 4 − 16 − 8 − 4 ✓
D. 12 − 144 − 62 − 31
Correct Answer: C
Q.10 An engineer is tasked with creating a hollow cone for a machine part, where the wall thickness must be consistent and the slant height is critical for assembly. Which factor is most important to ensure the cone will fit correctly in the final design?
A. Prioritizing uniform wall thickness over all other features
B. Ensuring the slant height matches the assembly requirement ✓
C. Focusing only on base diameter for precise fit
D. Matching only the overall height of the cone
Correct Answer: B
Q.11 Which of the following scenarios best demonstrates the conversion of chemical energy to mechanical energy?
A. A stone falls off a table to the ground
B. A runner uses stored energy from food to sprint forward ✓
C. A stretched rubber band snaps back to its original shape
D. A flashlight turns on after inserting new batteries
Correct Answer: B
Q.12 Among the five poles—I, N, C, H, and L—each having a different height, which pole is the tallest? (I) I is shorter than N but taller than C. C is taller than only one pole. (II) H is taller than L.
A. Both statements together are sufficient (not alone)
B. Data in statement II alone is sufficient while I is not
C. Data in statement I alone is sufficient while II is not
D. Both statements together are NOT sufficient ✓
Correct Answer: D
Q.13 A worker's hand is at risk of injury from a mechanical shearing action. Which situation best describes a shearing hazard?
A. A hand caught between a moving blade and a fixed machine surface during operation ✓
B. A hand becoming entangled in a rotating machine shaft during operation
C. A hand sliding repeatedly across a rough abrasive machine surface during work
D. A hand touching a hot metallic machine surface during maintenance activity
Correct Answer: A
Q.14 A thermometer shows a reading of 37 degrees Celsius. What is the corresponding temperature in Kelvin?
A. 310 K ✓
B. 320 K
C. 300 K
D. 270 K
Correct Answer: A
Q.15 What is the main purpose of ambient air quality standards?
A. To require all industries to reduce emissions by the exact same percentage.
B. To focus exclusively on industrial operations while ignoring other sectors.
C. To ensure air is routinely sampled to map historical pollution trends.
D. To set legally permissible limits for specific pollutants to protect public health. ✓
Correct Answer: D
Q.16 What is the best description of the purpose of multi-view drawing in engineering drawing?
A. To represent different sides of an object clearly on a flat surface ✓
B. To show different colors of an object for better visual appearance
C. To view an object from only one direction
D. To present the object in a single three-dimensional visual form only
Correct Answer: A
Q.17 A laboratory record shows a distance of 0.004 kilometers between two points. How should this be written in SI units of length for a scientific report?
A. 400 cm
B. 4 m ✓
C. 0.4 m
D. 4000 mm
Correct Answer: B
Q.18 If a scooter travels at a constant speed of 25 km per hour, how far will it travel in 4 hours?
A. 100 km ✓
B. 120 km
C. 75 km
D. 80 km
Correct Answer: A
Q.19 Which statement best describes a 'point' in engineering drawing?
A. A point is a short line segment used to mark measurements.
B. A point is the intersection of two lines and always has measurable length.
C. A point represents a small area with both length and width.
D. A point indicates a precise location but has no size, length, or width. ✓
Correct Answer: D
Q.20 When using a hand file during fitting operations, which action demonstrates adherence to tool safety protocols?
A. Fitting a proper handle securely to the tang ✓
B. Filing above shoulder height for better leverage
C. Applying excessive downward force when filing
D. Holding the file near its tang during filing work
Correct Answer: A
Q.21 What is the simplified value of the expression [cos A / (1 − tan A)] + [sin A / (1 − cot A)]?
A. 0
B. cos A + sin A ✓
C. 1
D. sin A − cos A
Correct Answer: B
Q.22 Which of the following letter-number clusters will replace the question mark (?) in the given series? QOI 5, OMG 10, MKE 15, KIC 20, ?
A. IHS 23
B. IGA 25 ✓
C. HIZ 30
D. JHZ 24
Correct Answer: B
Q.23 E, F, G, H, L and M live on six different floors... How many people live below H?
A. Three ✓
B. Two
C. One
D. Four
Correct Answer: A
Q.24 Which is the most important safety check before operating any machine in a workshop?
A. Check if the machine is plugged in properly
B. Ensure the machine area is properly illuminated
C. Inspect the machine for loose or damaged parts ✓
D. Wipe the machine with a dry cloth before use
Correct Answer: C
Q.25 There are two types of silver-copper alloys... Find the amount of the first alloy... to obtain a 100 kg mixture containing 90% silver.
A. 45 kg
B. 52 kg
C. 48 kg
D. 50 kg ✓
Correct Answer: D
Q.26 G is the mother of Y. Y is the sister of V. S is the father of L. L is the husband of V. How is G related to S?
A. Son's wife
B. Mother's mother
C. Son's wife's mother ✓
D. Son's wife's sister
Correct Answer: C
Q.27 P, Q, R, S and T have different ages. T is elder than only one person. S is elder than P but younger than Q. R is elder than Q. Who is the youngest?
A. S
B. R
C. Q
D. P ✓
Correct Answer: D
Q.28 A diamond ring costs ₹85,000. Its price is reduced first by 11% and then by 4% on the reduced price. Find the final price of the ring after both discounts.
A. ₹72,604
B. ₹74,624
C. ₹73,624
D. ₹72,624 ✓
Correct Answer: D
Q.29 Two students move identical boxes through a distance of 10 m. Student A applies a force of 50 N, while Student B applies a force of 100 N. What is the difference in the work done by the two students?
A. 0 J
B. 500 J ✓
C. 1000 J
D. 50 J
Correct Answer: B
Q.30 Solve the system of equations: −3x + 2y − z = −1, 6x − 6y + 7z = −7, 3x − 4y + 4z = −6
A. x=2, y=1, z=−3
B. x=2, y=2, z=−1 ✓
C. x=−2, y=2, z=11
D. x=1, y=2, z=2
Correct Answer: B
Quick Answer Key – Remaining Part-A (Q.31 onwards)
Remaining Part-A questions follow the same official answer key pattern extracted from the paper (similar common section as other trades). Full detailed options available in original PDF.
PART-B (Heat Engine Trade Specific)
Questions related to Engines, Fuel systems, Materials, Workshop tools, Safety etc.
Q.1 What impact does lock-up clutch engagement have on fuel consumption?
A. Reduces fuel economy by increasing losses
B. Improves fuel economy by reducing slippage ✓
C. Increases slippage and fuel consumption
D. No effect on fuel economy
Correct Answer: B
Q.2 Ferrous metals generally contain major amounts of:
A. Iron ✓
B. Aluminium
C. Zinc
D. Copper
Correct Answer: A
Q.3 A technician needs to improve the efficiency of combustion in a petrol engine. Which adjustment related to the spark plug could help achieve this goal?
A. Increasing the amount of engine current
B. Ensuring correct spark plug gap for proper ignition ✓
C. Modifying the spark plug's diameter
D. Adjusting the exhaust valve opening duration
Correct Answer: B
Q.4 In a vernier caliper, the small scale that slides along the main scale is called:
A. Vernier scale ✓
B. Pitch scale
C. Angular scale
D. Limit gauge scale
Correct Answer: A
Q.5 Where should an ammeter be connected in a circuit to measure current accurately?
A. With a resistor in parallel
B. In series with the load ✓
C. In parallel with the load
D. Across the supply terminals
Correct Answer: B
Q.6 Which functional characteristic of soft hammers makes them most suitable for use during marking and assembly operations involving finished or precision surfaces?
A. Hardened striking surface enabling accurate indentation during marking with centre punches
B. Ability to deform upon impact thereby preventing surface damage to marked or assembled components ✓
C. High rigidity of hammer face ensuring maximum force transmission during heavy forging operations
D. Elevated mass concentration providing deeper penetration effect during high-energy striking tasks
Correct Answer: B
Q.7 What is the main goal of safety legislation in a workshop?
A. To promote hazardous tasks in the workshop
B. To reduce equipment quality in the workshop
C. To protect workers from accidents and injuries ✓
D. To increase production speed in the workshop
Correct Answer: C
Q.8 In a workshop, a mechanic needs to determine the length of the diagonal support for a rectangular metal plate with sides of 9 cm and 12 cm. Which value represents the correct length of the diagonal support needed?
A. 16 cm
B. 14 cm
C. 13.5 cm
D. 15 cm ✓
Correct Answer: D
Q.9 In a conventional petrol engine assembly, which of the following locking devices is used to secure the connecting rod fasteners against loosening?
A. Plain washers fitted beneath the connecting rod bolt heads
B. Tab washers or lock plates fitted with connecting rod nuts ✓
C. Spring washers used as the only locking arrangement
D. Circlips installed in the connecting rod bearing housing
Correct Answer: B
Q.10 A technician is selecting a cylinder material for a petrol engine. Which property is most important for ensuring long service life?
A. Moderate strength and easy machinability
B. High thermal conductivity and wear resistance ✓
C. Low density and high ductility
D. High electrical conductivity
Correct Answer: B
Additional Key Heat Engine Questions with Official Answers:
Q.11 The working cycle of a four-stroke petrol engine consists of:
A. Suction, Compression, Power, Exhaust ✓
B. Suction, Power, Compression, Exhaust
C. Compression, Suction, Exhaust, Power
D. Power, Exhaust, Suction, Compression
Correct Answer: A
Q.12 In a diesel engine, the fuel is ignited by:
A. Spark plug
B. Heat of compression ✓
C. Glow plug only
D. External flame
Correct Answer: B
Q.13 The function of a carburettor in a petrol engine is to:
A. Mix air and fuel in correct proportion ✓
B. Inject diesel fuel
C. Cool the engine
D. Lubricate the piston
Correct Answer: A
Q.14 Which of the following is a major advantage of a four-stroke engine over a two-stroke engine?
A. Higher power-to-weight ratio
B. Better fuel efficiency and cleaner exhaust ✓
C. Simpler construction
D. Lower manufacturing cost
Correct Answer: B
Q.15 The purpose of the flywheel in an engine is to:
A. Increase the engine speed
B. Store energy and smooth out power fluctuations ✓
C. Cool the engine
D. Filter the oil
Correct Answer: B
Q.16 In IC engines, the clearance volume is the volume:
A. Above the piston at BDC
B. Above the piston at TDC ✓
C. Of the combustion chamber only when valves are open
D. Swept by the piston
Correct Answer: B
Q.17 Which cooling system is commonly used in modern automobile engines?
A. Air cooling only
B. Water / Liquid cooling with radiator ✓
C. Oil cooling only
D. Steam cooling
Correct Answer: B
Q.18 The device used to measure the specific gravity of battery electrolyte is:
A. Thermometer
B. Hydrometer ✓
C. Manometer
D. Barometer
Correct Answer: B
— End of Document —
Prepared from official RRB ALP Stage-2 CBT-2 Heat Engine (28 July 2026, Shift-1) question paper & answer key.
Correct options marked with bold ✓. Full options for remaining questions available in original PDF.
RRB ALP 2025 CBT 2 Heat Engine Question Paper and Answer Key PDF English (Jul 28, 2026)
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