Machine Design MCQ
Machine Design MCQ includes essential topics like stresses, shafts, gears, bearings, springs, fasteners, clutches, brakes, and fatigue design. These objective questions help students build strong fundamentals for mechanical engineering and competitive exams.
Q1. Machine design is concerned with?
A. Strength of materials
B. Design of machine components
C. Thermal design
D. Fluid power
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Q2. Factor of safety is defined as?
A. Load/Stress
B. Ultimate stress/Working stress
C. Stress/Load
D. Working stress/Ultimate stress
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Q3. Endurance limit is associated with?
A. Impact loading
B. Static loading
C. Fluctuating loading
D. Creep
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Q4. Shafts are designed based on?
A. Bending only
B. Torsion only
C. Combined bending and torsion
D. Axial load only
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Q5. Keys are used for?
A. Reducing friction
B. Joining belts
C. Transmitting torque
D. Reducing wear
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Q6. The most commonly used key is?
A. Taper key
B. Square key
C. Woodruff key
D. Gib-head key
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Q7. A bolt is primarily subjected to?
A. Tension
B. Compression
C. Torsion
D. Shear
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Q8. Preferred material for gears is?
A. Cast iron
B. Mild steel
C. Alloy steel
D. Aluminium
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Q9. Which bearing has least friction?
A. Journal bearing
B. Ball bearing
C. Bush bearing
D. Sleeve bearing
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Q10. Which theory is best for ductile materials?
A. Rankine
B. Tresca
C. Von Mises
D. Mohr
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Q11. Which joint is permanent?
A. Bolted joint
B. Welded joint
C. Screwed joint
D. Key joint
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Q12. Cotter joint is used for?
A. Rotating shafts
B. Connecting rods under axial load
C. Gear trains
D. Clutches
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Q13. The design stress should be?
A. Higher than working stress
B. Lower than ultimate stress
C. Equal to ultimate stress
D. Higher than ultimate stress
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Q14. The surface finish improves by?
A. Casting
B. Forging
C. Grinding
D. Turning
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Q15. Buckling occurs in?
A. Short columns
B. Long columns
C. Cubes
D. Plates
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Q16. A thick cylinder experiences maximum stress at?
A. Outer surface
B. Inner surface
C. Middle
D. Anywhere
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Q17. Flywheel stores?
A. Heat energy
B. Potential energy
C. Kinetic energy
D. Chemical energy
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Q18. Creep is time-dependent deformation under?
A. Low temperature
B. High temperature
C. Room temperature
D. Zero temperature
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Q19. Stress concentration is reduced by?
A. Sharp corners
B. Polishing
C. Providing fillets
D. Using brittle materials
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Q20. Shear stress in a circular shaft is maximum at?
A. Axis
B. Neutral axis
C. Outer surface
D. Mid radius
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Q21. Which thread is used for power transmission?
A. Metric thread
B. Acme thread
C. Square thread
D. BSP thread
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Q22. Which clutch uses centrifugal force?
A. Cone clutch
B. Centrifugal clutch
C. Plate clutch
D. Dog clutch
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Q23. Wear in bearings is reduced by?
A. Friction
B. Lubrication
C. Heat
D. Pressure
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Q24. Which material is used for bearings?
A. Cast iron
B. Bronze
C. Aluminium
D. Copper
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Q25. Cam followers convert?
A. Linear to rotary
B. Rotary to reciprocating
C. Reciprocating to fluid
D. Fluid to motion
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Q26. In welded joints, strength depends on?
A. Bead size
B. Penetration
C. Electrode only
D. Polishing
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Q27. In shafts, fatigue failure occurs due to?
A. Static load
B. Reversal of loads
C. Creep
D. Uniform load
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Q28. The factor used to account for stress concentration is?
A. Kp
B. Kt
C. Ks
D. Kw
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Q29. The maximum shear stress theory is called?
A. Mises theory
B. Rankine theory
C. Tresca theory
D. Soderberg theory
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Q30. Fillet welds are used for?
A. Butt joints
B. Lap joints
C. Groove joints
D. Edge joints
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