DRDO CEPTAM STA-B Tier-2 Mock Test – Mechanical/Engineering Trade

Instructions:

• Total Questions: 50
• Each question carries 1 mark
• Time: 60 minutes
• No negative marking
• Focus: Trade-specific technical knowledge

Parameter	Details
Exam Type	Computer-Based Test (CBT) – Trade/Subject Knowledge
Total Questions	50
Duration	60 minutes
Section-wise Distribution	1. Mechanical & Engineering Fundamentals – 15 Qs2. Manufacturing & Workshop Technology – 15 Qs3. Thermodynamics & Fluid Mechanics – 10 Qs4. Engineering Mechanics & Strength of Materials – 10 Qs
Marking Scheme	+1 mark for correct answer, no negative marking (as per DRDO Tier-2 trend)
Syllabus Coverage	Mechanical engineering principles, workshop practices, manufacturing processes, thermodynamics, fluid mechanics, strength of materials, engineering mechanics
Purpose	Assess technical knowledge and subject competency of trade-specific candidates

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Part 1 – Mechanical & Engineering Fundamentals (Questions 1–15)

Q1. In a simple beam under uniformly distributed load, the maximum bending moment occurs:

A. At the support
B. At the midpoint
C. At one-third span from support
D. At quarter span

Q2. The moment of inertia of a circular section about its centroidal axis is:

A. $\pi d^4 / 64$πd4/64
B. $\pi d^3 / 32$πd3/32
C. $\pi d^2 / 16$πd2/16
D. $\pi d^4 / 32$πd4/32

Q3. Which of the following is a primary function of a flywheel?

A. To reduce speed
B. To store energy and reduce fluctuation in speed
C. To increase torque
D. To improve efficiency of pumps

Q4. The efficiency of a machine is defined as:

A. Work output / Work input × 100
B. Work input / Work output × 100
C. Force × Distance / Time
D. Output power / Input power

Q5. In thermodynamics, the first law relates:

A. Work and temperature
B. Heat and work to internal energy
C. Entropy and temperature
D. Pressure and volume

Q6. Which type of gear is used to transmit motion between non-parallel, non-intersecting shafts?

A. Spur gear
B. Bevel gear
C. Worm gear
D. Helical gear

Q7. In a refrigeration cycle, which component is responsible for reducing pressure and temperature of the refrigerant?

A. Compressor
B. Condenser
C. Expansion valve
D. Evaporator

Q8. The unit of torque in SI system is:

A. N·m
B. N·m²
C. Nm²/kg
D. J·s

Q9. For a steel rod of length L subjected to axial tensile load, strain is:

A. Stress × Length
B. Change in length / Original length
C. Force / Area
D. Stress / Modulus of elasticity

Q10. In fluid mechanics, Bernoulli’s equation assumes:

A. Flow is compressible
B. Flow is viscous
C. Flow is inviscid and steady
D. Flow is turbulent

Q11. Which of the following welding processes uses a consumable electrode with shielding gas?

A. SMAW
B. TIG
C. MIG
D. Oxy-acetylene

Q12. The coefficient of friction depends on:

A. Area of contact
B. Normal force
C. Nature of surfaces
D. Both B and C

Q13. In a four-stroke IC engine, power stroke occurs in:

A. Intake stroke
B. Compression stroke
C. Power stroke
D. Exhaust stroke

Q14. Which material has highest thermal conductivity?

A. Steel
B. Aluminum
C. Copper
D. Cast iron

Q15. A cantilever beam with a point load at free end has maximum bending moment:

A. At free end
B. At midpoint
C. At fixed end
D. At quarter span

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Part 2 – Manufacturing & Workshop Technology (Questions 16–30)

Q16. Which process removes material by shearing?

A. Milling
B. Turning
C. Drilling
D. Punching

Q17. The process of hardening steel by heating and quenching is called:

A. Annealing
B. Tempering
C. Normalizing
D. Hardening

Q18. In casting, the riser is used to:

A. Reduce turbulence
B. Feed molten metal to shrinkage zones
C. Create mold cavity
D. Support the mold

Q19. In Lathe operation, depth of cut affects:

A. Surface finish only
B. Material removal rate and surface finish
C. Feed only
D. Cutting speed

Q20. A lathe center used to hold workpiece is:

A. Drive center
B. Dead center
C. Live center
D. Rotating center

Q21. Which welding defect is caused by rapid cooling?

A. Porosity
B. Cracks
C. Undercut
D. Slag inclusion

Q22. EDM stands for:

A. Electric Discharge Machining
B. Electrochemical Deposition Method
C. Electro Dynamic Mechanism
D. Electrical Drill Machining

Q23. Which machine is suitable for cutting gears?

A. Lathe
B. Milling machine
C. Shaper
D. Planer

Q24. Surface roughness is measured in:

A. Micrometers (μm)
B. Millimeters (mm)
C. Nanometers (nm)
D. Centimeters (cm)

Q25. Which metal is commonly used for making cutting tools?

A. Mild steel
B. High-speed steel
C. Aluminum
D. Copper

Q26. Which process is used for precision cylindrical holes?

A. Boring
B. Milling
C. Turning
D. Shaping

Q27. The main advantage of CNC machines is:

A. High speed only
B. Automation and precision
C. Low cost
D. Manual control

Q28. Which of the following is a non-traditional machining process?

A. Turning
B. Milling
C. EDM
D. Grinding

Q29. In welding, electrode coating provides:

A. Filler material
B. Slag formation
C. Gas shield
D. All of the above

Q30. Hardness of steel is measured by:

A. Brinell test
B. Rockwell test
C. Vickers test
D. All of the above

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Part 3 – Thermodynamics & Fluid Mechanics (Questions 31–40)

Q31. Efficiency of a Carnot engine depends on:

A. Working substance
B. Temperature difference
C. Pressure
D. Heat input only

Q32. In a nozzle, velocity is maximum at:

A. Inlet
B. Throat
C. Exit
D. Mid-length

Q33. Reynolds number determines:

A. Flow type (laminar or turbulent)
B. Flow rate
C. Pressure drop
D. Pipe diameter

Q34. Hydraulic systems operate on:

A. Pascal’s law
B. Archimedes’ principle
C. Bernoulli’s principle
D. Newton’s law

Q35. Relative density of water is:

A. 1
B. 0.5
C. 2
D. 1.5

Q36. Ideal gas equation is:

A. PV = nRT
B. P + V = nRT
C. P/V = nRT
D. P – V = nRT

Q37. Which is a primary function of a boiler?

A. Generate pressure
B. Produce steam
C. Heat water only
D. Reduce temperature

Q38. Viscosity is a measure of:

A. Friction in fluid
B. Density
C. Pressure
D. Flow rate

Q39. In a heat exchanger, counterflow arrangement:

A. Improves heat transfer efficiency
B. Reduces pressure drop
C. Lowers temperature difference
D. Reduces viscosity

Q40. The critical point of a substance is:

A. Maximum temperature
B. Maximum pressure
C. Where liquid and gas coexist
D. None of the above

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Part 4 – Engineering Mechanics & Strength of Materials (Questions 41–50)

Q41. Stress is defined as:

A. Force × Area
B. Force / Area
C. Area / Force
D. None

Q42. Strain is:

A. Stress × Young’s modulus
B. Change in length / Original length
C. Force / Area
D. Work done / Volume

Q43. Factor of safety =

A. Ultimate load / Working load
B. Working load / Ultimate load
C. Yield load × Working load
D. None

Q44. A simply supported beam with uniform load:

A. Max shear at mid-span
B. Max bending moment at supports
C. Max bending moment at mid-span
D. None

Q45. Torsion in shafts depends on:

A. Length only
B. Material only
C. Torque, diameter, material
D. Diameter only

Q46. Moment of inertia of rectangular section about centroidal axis:

A. bh³/12
B. b³h/12
C. bh³/6
D. b³h/6

Q47. A spring is subjected to load, the energy stored is:

A. 1/2 k x²
B. k x²
C. 2 k x²
D. k / x²

Q48. Poisson’s ratio is:

A. Lateral strain / Longitudinal strain
B. Longitudinal strain / Lateral strain
C. Stress / Strain
D. Strain / Stress

Q49. Shear stress in circular shaft =

A. Torque × radius / J
B. Torque × radius² / J
C. Torque / radius
D. Torque / J

Q50. The elastic limit of a material is:

A. Maximum stress it can withstand
B. Stress beyond which permanent deformation occurs
C. Yield point
D. Breaking stress

Q.No	Answer	Q.No	Answer	Q.No	Answer	Q.No	Answer
1	B	14	C	27	B	40	C
2	A	15	C	28	C	41	B
3	B	16	D	29	D	42	B
4	A	17	D	30	D	43	A
5	B	18	B	31	B	44	C
6	C	19	B	32	C	45	C
7	C	20	B	33	A	46	A
8	A	21	B	34	A	47	A
9	B	22	A	35	A	48	A
10	C	23	B	36	A	49	A
11	C	24	A	37	B	50	B
12	D	25	B	38	A
13	C	26	A	39	A

Disclaimer

This mock test is created for educational and practice purposes only. All questions are original and designed to simulate the DRDO CEPTAM STA-B Tier-2 trade/subject exam. This website is not affiliated with or endorsed by DRDO