RRB ALP Engineering Questions: Mechanical Engineering is a vital part of the RRB ALP syllabus, especially for the Technician and ALP posts. Scoring well in this section can significantly boost your overall rank, as questions are often concept-based and application-oriented. This article compiles important Mechanical Engineering questions and a free PDF for the RRB ALP 2026 aspirants.
Download Top RRB ALP Mechanical Engineering Questions PDF
It is recommended to download the top RRB ALP Mechanical Engineering Questions PDF for your practice. The link to download the PDF is shared below:
Practice the RRB ALP Mechanical Engineering Questions (Live)
Given below are the top RRB ALP Mechanical Engineering questions. Attempt them live and check your score as per the real exam marking scheme. You will get +2 for every correct answer, – 0.5 for every wrong answer, and 0 for unattempted questions.
- What is the unit of torque in SI system?
a) N·m
b) kg·m/s²
c) J
d) Pa
Answer: a) N·m - The function of a flywheel in an engine is to:
a) Increase engine speed
b) Store energy and smoothen torque fluctuations
c) Reduce friction
d) Increase fuel efficiency
Answer: b) Store energy and smoothen torque fluctuations - In a four-stroke engine, the power stroke occurs during:
a) Intake stroke
b) Compression stroke
c) Expansion stroke
d) Exhaust stroke
Answer: c) Expansion stroke - Which of the following is a ferrous metal?
a) Aluminum
b) Copper
c) Cast Iron
d) Zinc
Answer: c) Cast Iron - The unit of thermal conductivity is:
a) W/m·K
b) J/s
c) N·m
d) Pa·s
Answer: a) W/m·K - The process of hardening steel by heating and quenching in water or oil is called:
a) Annealing
b) Tempering
c) Normalizing
d) Hardening
Answer: d) Hardening - The ratio of output to input in a mechanical system is known as:
a) Efficiency
b) Mechanical advantage
c) Velocity ratio
d) Power factor
Answer: a) Efficiency - Which gas is commonly used in gas welding?
a) Oxygen
b) Acetylene
c) Nitrogen
d) Hydrogen
Answer: b) Acetylene - In a belt drive, if the speed ratio is increased, the belt tension:
a) Increases
b) Decreases
c) Remains same
d) First increases, then decreases
Answer: a) Increases - Which of the following is a renewable source of energy?
a) Coal
b) Oil
c) Solar energy
d) Natural gas
Answer: c) Solar energy - In a reciprocating pump, the delivery is:
a) Continuous
b) Intermittent
c) Uniform
d) Zero
Answer: b) Intermittent - Which of the following is used for lubrication under high load?
a) Water
b) Grease
c) Mineral oil
d) Kerosene
Answer: b) Grease - The efficiency of a Carnot engine depends on:
a) Working substance
b) Temperature of source and sink
c) Pressure ratio
d) Heat capacity
Answer: b) Temperature of source and sink - In a diesel engine, ignition occurs due to:
a) Spark
b) Compression
c) Cooling
d) Fuel injection
Answer: b) Compression - The main purpose of a governor in an engine is:
a) Increase speed
b) Control fuel consumption
c) Regulate speed
d) Reduce friction
Answer: c) Regulate speed - Which of the following is a non-destructive testing method?
a) Tensile test
b) Hardness test
c) Ultrasonic testing
d) Shear test
Answer: c) Ultrasonic testing - The modulus of elasticity is the ratio of:
a) Stress to strain within elastic limit
b) Strain to stress
c) Load to elongation
d) Force to area
Answer: a) Stress to strain within elastic limit - Which type of boiler is used in locomotives?
a) Fire tube boiler
b) Water tube boiler
c) Electric boiler
d) Nuclear boiler
Answer: a) Fire tube boiler - Which of the following is used in refrigeration cycles?
a) Ammonia
b) Hydrogen
c) Oxygen
d) Nitrogen
Answer: a) Ammonia - In a screw jack, the mechanical advantage is high because:
a) Friction is high
b) Pitch is small
c) Handle is long
d) Load is heavy
Answer: b) Pitch is small - In internal combustion engines, knocking is caused due to:
a) Early ignition of fuel-air mixture
b) Delayed ignition
c) Insufficient cooling
d) High compression ratio
Answer: a) Early ignition of fuel-air mixture - The angle of contact of a belt with a pulley is maximum when:
a) Pulley is small
b) Pulley is large
c) Belt is loose
d) Belt is short
Answer: b) Pulley is large - The main component of a hydraulic press is:
a) Pump
b) Cylinder
c) Piston
d) All of the above
Answer: d) All of the above - Which of the following is used as cutting tool material for high-speed machining?
a) Mild steel
b) Cast iron
c) High-speed steel (HSS)
d) Aluminum
Answer: c) High-speed steel (HSS) - In a refrigeration cycle, the expansion valve:
a) Increases pressure
b) Reduces pressure
c) Increases temperature
d) Compresses refrigerant
Answer: b) Reduces pressure
26. The function of a condenser in a steam power plant is to:
a) Increase steam pressure
b) Condense exhaust steam
c) Increase temperature
d) Reduce friction
Answer: b) Condense exhaust steam
27. Which welding process uses a non-consumable electrode?
a) MIG
b) TIG
c) Arc welding with consumable electrode
d) Gas welding
Answer: b) TIG
28. The main advantage of a water tube boiler over a fire tube boiler is:
a) Lower cost
b) Higher pressure and capacity
c) Simple design
d) Easy maintenance
Answer: b) Higher pressure and capacity
29. The ratio of ultimate stress to yield stress is called:
a) Factor of safety
b) Ductility
c) Hardness
d) Toughness
Answer: a) Factor of safety
30. In a centrifugal pump, the velocity of fluid is converted into:
a) Pressure
b) Heat
c) Work
d) Friction
Answer: a) Pressure
31. The type of gear used in clocks is:
a) Spur gear
b) Helical gear
c) Bevel gear
d) Worm gear
Answer: a) Spur gear
32. Which of the following is an example of a positive displacement pump?
a) Centrifugal pump
b) Reciprocating pump
c) Axial flow pump
d) Mixed flow pump
Answer: b) Reciprocating pump
33. The function of a radiator in an engine is to:
a) Increase fuel efficiency
b) Cool engine by dissipating heat
c) Reduce engine speed
d) Increase compression
Answer: b) Cool engine by dissipating heat
34. Which of the following is used in forging?
a) Hammer
b) Lathe
c) Milling machine
d) Drill
Answer: a) Hammer
35. In a heat exchanger, counterflow arrangement is preferred because:
a) Temperature difference is maximum
b) Flow is easier
c) Cost is low
d) Material required is less
Answer: a) Temperature difference is maximum
36. Which material is used for making gears?
a) Mild steel
b) Cast iron
c) Alloy steel
d) Aluminum
Answer: c) Alloy steel
37. In a four-stroke diesel engine, how many strokes are there per cycle?
a) 1
b) 2
c) 4
d) 3
Answer: c) 4
38. The main purpose of a clutch in an automobile is to:
a) Increase speed
b) Transmit torque smoothly
c) Reduce friction
d) Cool engine
Answer: b) Transmit torque smoothly
39. In a centrifugal governor, an increase in engine speed causes:
a) Balls move outward
b) Balls move inward
c) No movement
d) Governor failure
Answer: a) Balls move outward
40. Which of the following is a non-ferrous metal?
a) Steel
b) Aluminum
c) Cast iron
d) Wrought iron
Answer: b) Aluminum
41. In a steam turbine, the blades are designed to:
a) Increase velocity of steam
b) Extract energy from steam
c) Reduce pressure
d) Increase friction
Answer: b) Extract energy from steam
42. The main purpose of a draft tube in a reaction turbine is to:
a) Increase velocity
b) Convert kinetic energy into pressure
c) Reduce speed
d) Heat the fluid
Answer: b) Convert kinetic energy into pressure
43. Which of the following is a high carbon steel?
a) 0.2% C
b) 0.5% C
c) 0.8% C
d) 1.5% C
Answer: c) 0.8% C
44. The unit of power is:
a) Watt
b) Newton
c) Joule
d) Pascal
Answer: a) Watt
45. Which type of boiler mountings is used for safety?
a) Pressure gauge
b) Water level indicator
c) Safety valve
d) Blow-off cock
Answer: c) Safety valve
46. The ratio of lead to pitch in a screw is called:
a) Efficiency
b) Velocity ratio
c) Helix angle
d) Mechanical advantage
Answer: c) Helix angle
47. Which of the following fuels is used in gas turbines?
a) Diesel
b) Petrol
c) Natural gas
d) Coal
Answer: c) Natural gas
48. The efficiency of a reversible engine is:
a) Less than Carnot engine
b) Equal to Carnot engine
c) More than Carnot engine
d) Cannot be determined
Answer: b) Equal to Carnot engine
49. In a lathe, the carriage is used to:
a) Rotate the workpiece
b) Move the cutting tool longitudinally
c) Hold the workpiece
d) Cool the tool
Answer: b) Move the cutting tool longitudinally
50. The main advantage of using alloy steel over carbon steel is:
a) Cheaper
b) Better corrosion resistance and mechanical properties
c) Easier to machine
d) Less dense
Answer: b) Better corrosion resistance and mechanical properties
Topic-Wise Breakdown of Mechanical Engineering Questions
In the table below, we have provided the topic-wise breakdown of RRB ALP Engineering Questions in the mechanical section. Check out the details below:
| Topic | Approx. Weightage (%) | Key Areas | Example Question Types |
| Thermodynamics | 15–20 | Laws of thermodynamics, heat engines, cycles, properties of gases | Numerical problems, concept-based MCQs |
| Strength of Materials | 10–15 | Stress, strain, bending moment, torsion, columns | Calculation-based, theory application |
| Fluid Mechanics & Hydraulics | 10–12 | Fluid properties, Bernoulli’s equation, flow through pipes, pumps | Numerical, diagram interpretation |
| Manufacturing & Workshop | 10–12 | Casting, welding, machining processes, CNC basics | Conceptual, process sequence, equipment identification |
| Engineering Mechanics | 8–10 | Force systems, equilibrium, friction, moments | Problem-solving, numerical questions |
| Theory of Machines | 8–10 | Gears, cams, flywheels, balancing | Formula application, diagram-based MCQs |
| Refrigeration & Air Conditioning | 5–8 | Refrigerants, COP, simple cycle problems | Conceptual and numerical |
| Material Science & Metallurgy | 5–8 | Material properties, heat treatment, alloys | Direct theory, application-based |
| Electrical & Electronics Basics (Mechanical Integration) | 2–5 | Motors, transformers, basic circuits | Conceptual understanding for integrated systems |
What should be the ideal preparation strategy for RRB ALP Mechanical Engineering?
The ideal preparation strategy for the mechanical engineering questions would be to understand the concept first and memorise the formulas. We have given below some preparation strategies to face RRB ALP Mechanical Engineering Questions. Check out the details below:
- Concept First, Formula Second: Understand the derivation of key formulas rather than rote memorisation.
- Practice Previous Year Questions: RRB ALP often repeats numerical patterns and conceptual questions.
- Short Notes & Formula Sheets: Maintain a compact reference sheet for thermodynamics, mechanics, and manufacturing processes.
- Mock Tests & Timed Practice: Simulate exam conditions to improve speed and accuracy.
- High-Yield Topic Focus: Thermodynamics, Strength of Materials, and Fluid Mechanics are repeatedly asked; allocate extra time to these areas.
FAQs
The most important topics are Thermodynamics, Strength of Materials, and Fluid Mechanics, together accounting for nearly 40–45% of the technical section. Prioritising these can boost your overall score.
Practice is key. Focus on formulas, derivations, and previous year numerical patterns. Use timed mock tests to improve speed and accuracy. Making a formula sheet helps in quick revision.
Yes. Many questions test conceptual understanding of Thermodynamics, Manufacturing processes, Material Science, and Theory of Machines, often in combination with practical problem-solving.
Solving at least the last 5 – 7 years of RRB ALP Mechanical Engineering questions is recommended. This helps identify frequently asked topics and recurring numerical problems.
Allocate time based on weightage and difficulty. Spend more time on high-weightage topics (Thermodynamics, Strength of Materials) while maintaining daily practice for low-weightage areas like Material Science and Manufacturing. Incorporate mock tests to cover all topics efficiently.
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