Part XIV — Full-Length Mock Tests

Chapter 15: Mock Test 1 — RRB JE CBT 2 Technical Abilities Pattern (50 MCQs)

This full-length mock test simulates the Technical Abilities-heavy portion of RRB JE CBT 2 for Mechanical Engineering, with additional questions from General Awareness, Computer Applications, and Environmental Engineering. Suggested time limit: 40 minutes.

1. Newton's First Law of Motion is also known as the law of:
   (a) Action-reaction (b) Inertia (c) Conservation of energy (d) Gravitation
2. Newton's Third Law states that for every action, there is:
   (a) No reaction (b) An equal and opposite reaction (c) A smaller, unequal reaction (d) A delayed reaction
3. Static friction, compared to kinetic friction, is generally:
   (a) Always less than kinetic friction (b) Slightly greater than (or equal to, at the limiting point) kinetic friction (c) Always zero (d) Unrelated to kinetic friction
4. Stress is defined as:
   (a) Force per unit volume (b) Force per unit area (c) Deformation per unit length (d) Energy per unit area
5. Poisson's Ratio is defined as the ratio of:
   (a) Longitudinal strain to lateral strain (b) Lateral strain to longitudinal strain (c) Stress to strain directly (d) Force to area
6. Factor of Safety (FoS) is defined as the ratio of:
   (a) Working stress to ultimate/yield strength (b) Ultimate/yield strength to allowable/working stress (c) Strain to stress (d) Force to velocity
7. The First Law of Thermodynamics is fundamentally a statement of:
   (a) Entropy increase (b) Energy conservation (c) Temperature equilibrium (d) Zero absolute temperature
8. The Kelvin-Planck statement of the Second Law asserts that:
   (a) No engine can convert heat completely into work in a cyclic process (b) All engines are 100% efficient (c) Heat always flows from cold to hot spontaneously (d) Entropy always decreases
9. The Carnot cycle represents:
   (a) The minimum possible efficiency for a heat engine (b) The theoretical maximum possible efficiency between two given temperatures (c) An efficiency independent of temperature (d) A cycle used only in refrigeration
10. In the Otto cycle, heat addition occurs at constant:
    (a) Pressure (b) Volume (c) Temperature (d) Entropy only
11. In the Diesel cycle, heat addition occurs at constant:
    (a) Volume (b) Pressure (c) Entropy only (d) Temperature
12. The Rankine cycle's main components include a boiler, turbine, condenser, and:
    (a) Feed pump (b) Carburettor (c) Spark plug (d) Piston-cylinder assembly only
13. A kinematic chain in which one link is fixed is called a:
    (a) Kinematic pair (b) Mechanism (c) Kinematic link (d) Gear train
14. Helical gears, compared to spur gears, generally provide:
    (a) Rougher, noisier operation (b) Smoother, quieter operation with greater load capacity (c) No axial thrust under any condition (d) Lower load capacity
15. Bevel gears are primarily used to connect:
    (a) Parallel shafts (b) Intersecting shafts, typically at 90° (c) Non-intersecting, non-parallel shafts only (d) Shafts that never need power transmission
16. Worm gears are particularly valued for providing:
    (a) Very high gear reduction ratios in a compact arrangement (b) The lowest possible reduction ratio (c) No self-locking capability ever (d) Parallel shaft connection only
17. A flywheel's primary function is to:
    (a) Regulate mean engine speed over a period of varying load (b) Store rotational kinetic energy to smooth out instantaneous speed fluctuations (c) Convert reciprocating motion into rotary motion exclusively (d) Measure engine torque directly
18. Bernoulli's Theorem states pressure head, velocity head, and elevation head sum to a value that is:
    (a) Zero (b) Constant along a streamline (c) Always increasing (d) Dependent only on pipe material
19. A centrifugal pump uses a rotating impeller to convert kinetic energy into:
    (a) Pressure energy (b) Chemical energy (c) Thermal energy directly (d) Nuclear energy
20. A Pelton wheel is classified as:
    (a) A reaction turbine (b) An impulse turbine (c) A centrifugal pump (d) A reciprocating pump
21. A Francis turbine is best suited for:
    (a) High head, low flow-rate applications (b) Medium head, medium flow-rate applications (c) Only zero-flow conditions (d) Compressed air applications only
22. A Kaplan turbine is best suited for:
    (a) High head, low flow-rate applications (b) Low head, high flow-rate applications (c) Medium head applications only (d) Only impulse-type operation
23. Sand casting typically uses which type of mould material?
    (a) Steel dies exclusively (b) A sand mould, often "green sand" (c) Ceramic shells exclusively (d) Only wax patterns
24. Die casting is particularly suited for:
    (a) One-off, low-volume production (b) High-volume production of precision parts, often non-ferrous alloys (c) Only ferrous metals (d) Only very large components
25. Shielded Metal Arc Welding (SMAW) generates heat via:
    (a) A gas flame (b) An electric arc between electrode and workpiece (c) Electrical resistance heating under pressure only (d) Friction alone
26. Resistance (spot) welding is widely used in:
    (a) Automotive body sheet-metal assembly (b) Casting large iron blocks (c) Cutting threads on bolts (d) Measuring dimensions
27. A lathe machine is primarily used for:
    (a) Producing flat surfaces and slots (b) Turning cylindrical parts by rotating the workpiece against a cutting tool (c) Producing round holes only (d) Casting molten metal
28. A vernier caliper typically has a least count of approximately:
    (a) 0.02mm (b) 0.2mm (c) 2mm (d) 20mm
29. A micrometer (screw gauge) typically provides a least count of approximately:
    (a) 0.1mm (b) 0.01mm (c) 1mm (d) 10mm
30. Spark-Ignition (SI) engines typically operate on which idealised thermodynamic cycle?
    (a) Diesel cycle (b) Otto cycle (c) Rankine cycle (d) Brayton cycle
31. In a CI (diesel) engine, ignition occurs due to:
    (a) A spark plug igniting a pre-mixed charge (b) Air compressed to a high temperature that spontaneously ignites injected fuel (c) An external flame source (d) Electrical resistance heating
32. A four-stroke engine completes one power stroke per:
    (a) One crankshaft revolution (b) Two crankshaft revolutions (c) Four crankshaft revolutions (d) Half a revolution
33. Compression ratio is defined as the ratio of:
    (a) Clearance volume to total cylinder volume (b) Total cylinder volume to clearance volume (c) Bore to stroke (d) Power to torque
34. Mean Effective Pressure (MEP) is best described as:
    (a) The maximum instantaneous pressure (b) A theoretical average pressure producing the same net work as the actual varying pressure (c) The exhaust gas pressure only (d) Atmospheric pressure at sea level
35. In a thermal (steam) power plant, the boiler's primary function is to:
    (a) Condense steam back to water (b) Generate heat, converting water to high-pressure steam (c) Drive the generator directly (d) Store fuel
36. A nuclear power plant generates heat primarily through:
    (a) Combustion of coal (b) Controlled nuclear fission (typically of uranium-235) (c) Solar radiation (d) Wind turbine rotation
37. RRB JE examinations apply negative marking of:
    (a) 1/4 mark (b) 1/3 mark (c) 1/2 mark (d) No negative marking
38. CBT 1 in the RRB JE exam is:
    (a) Common for all disciplines, used for shortlisting (b) Discipline-specific, directly determines merit (c) Optional (d) Only for Mechanical candidates
39. Which of the following is an example of an input device in basic computer applications?
    (a) Keyboard (b) Monitor (c) Printer (d) Speaker
40. RAM in a computer system is best described as:
    (a) Permanent, non-volatile storage (b) Volatile memory used for temporary data during processing (c) A type of printer (d) An input device
41. India's Constitution came into effect on:
    (a) 15 August 1947 (b) 26 January 1950 (c) 26 November 1949 (d) 2 October 1950
42. Ozone layer depletion is primarily caused by:
    (a) Carbon dioxide (b) Chlorofluorocarbons (CFCs) (c) Sulphur dioxide (d) Methane
43. Acid rain results primarily from which pollutants?
    (a) Carbon dioxide and methane (b) Sulphur dioxide and nitrogen oxides (c) CFCs alone (d) Particulate matter alone
44. Global warming is primarily attributed to increased concentrations of:
    (a) Greenhouse gases trapping heat (b) Ozone in the stratosphere (c) Particulate matter alone (d) Groundwater depletion
45. Which of the following is a widely used open-source operating system alongside Windows?
    (a) MS Office (b) Linux (c) Photoshop (d) AutoCAD
46. The Indian Parliament consists of the President, the Lok Sabha, and:
    (a) The Rajya Sabha (b) The Supreme Court (c) The Election Commission (d) The Planning Commission
47. A reciprocating pump operates on which basic principle?
    (a) Centrifugal force (b) Positive displacement, via a piston/plunger (c) Magnetic induction (d) Bernoulli's principle exclusively
48. Limits, fits, and tolerances in manufacturing primarily ensure:
    (a) Proper assembly and interchangeability of mating parts (b) Reduced material cost only (c) Increased casting temperature (d) Faster welding speed
49. A two-stroke engine, compared to a four-stroke engine, generally provides:
    (a) Less power per cycle for a given size (b) More power per cycle for a given size, but often less fuel efficiency (c) Identical efficiency in all cases (d) No practical power output
50. Investment casting (lost-wax casting) is valued for:
    (a) Very high dimensional accuracy and intricate detail (b) Being the cheapest process for large simple castings (c) Requiring no pattern at all (d) Using only sand moulds

Answer Key

1.(b)

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49.(b) 50.(a)