⚙️ Machine Design MCQ Questions with Answers & Live Score

Practice 100+ important Machine Design MCQs with answers, detailed explanations, and exam-oriented concepts

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Question 1: In fatigue design of a rotating shaft subjected to completely reversed bending, which failure criterion is most appropriate for ductile materials under fluctuating stresses?

Question 2: A key connecting a gear to a shaft fails primarily due to which type of stress when torque transmission is high?

Question 3: In the design of helical compression springs, Wahl factor is used to account for what effect?

Question 4: In hydrodynamic journal bearings, the minimum film thickness is primarily influenced by which parameter?

Question 5: Which theory is most suitable for predicting failure in brittle materials subjected to complex stress states?

Question 6: In bolted joints subjected to fluctuating loads, preloading is done mainly to achieve what purpose?

Question 7: In gear design, interference occurs when:

Question 8: What is the primary function of a flywheel in mechanical systems?

Question 9: In riveted joints, why is pitch kept within a specific limit?

Question 10: Which type of clutch is most suitable for transmitting high torque smoothly without shock?

Question 11: In the design of shafts under combined bending and torsion, equivalent twisting moment is used based on which theory?

Question 12: In belt drives, creep is mainly caused due to:

Question 13: In rolling contact bearings, fatigue failure is commonly observed as:

Question 14: Which factor has the greatest influence on the endurance limit of a component?

Question 15: In gear trains, hunting tooth condition is desirable because:

Question 16: What is the primary reason for using case hardening in gears?

Question 17: In welded joints, which type of loading is most critical for fatigue failure?

Question 18: In cam design, undercutting is avoided to ensure:

Question 19: In power screws, efficiency is maximum when:

Question 20: In pressure vessel design, thin cylinder assumption is valid when:

Question 21: In a shaft subjected to combined bending, torsion, and axial load, which failure theory is most accurate for ductile materials under dynamic loading?

Question 22: In hydrodynamic lubrication, the pressure developed in the lubricant film is primarily due to:

Question 23: In spur gears, contact ratio is defined as:

Question 24: Which failure mode is most critical in rolling element bearings under heavy cyclic loads?

Question 25: In a flat belt drive, maximum power transmission occurs when:

Question 26: In welded joints, stress concentration is highest at:

Question 27: In power screws, self-locking condition exists when:

Question 28: Which parameter most significantly affects the life of a rolling bearing?

Question 29: In gear design, the Lewis equation is used to estimate:

Question 30: In cam-follower systems, pressure angle should be kept low to:

Question 31: In bolted joints, stiffness of the joint is defined as:

Question 32: In hydrodynamic bearings, Sommerfeld number represents:

Question 33: In a multi-plate clutch, torque capacity is increased by:

Question 34: Which type of stress is induced in a thin cylindrical pressure vessel along its circumference?

Question 35: In belt drives, slip reduces:

Question 36: In gear trains, backlash is provided to:

Question 37: In fatigue loading, stress concentration factor is reduced by:

Question 38: In journal bearings, eccentricity ratio is defined as:

Question 39: In cam design, dwell period refers to:

Question 40: In design against fatigue, factor of safety is generally higher because:

Question 41: In fatigue analysis using Goodman relation, the failure criterion is based on a linear relation between:

Question 42: In hydrodynamic journal bearings, the attitude angle represents:

Question 43: In spur gear design, undercutting is more likely to occur when:

Question 44: In a flat belt drive, the ratio of tensions in the tight side to slack side is governed by:

Question 45: In a helical gear, the axial thrust is primarily due to:

Question 46: In rolling bearings, the dynamic load rating is defined as:

Question 47: In design of keys, shear failure occurs when:

Question 48: In a cam mechanism, jerk is defined as:

Question 49: In riveted joints, efficiency is defined as:

Question 50: In a multi-start screw, the lead is equal to:

Question 51: In fatigue loading, notch sensitivity indicates:

Question 52: In hydrodynamic bearings, cavitation occurs when:

Question 53: In spur gears, backlash is measured along:

Question 54: In belt drives, the centrifugal tension is proportional to:

Question 55: In design of springs, surge is caused due to:

Question 56: In welded joints, throat thickness is defined as:

Question 57: In rolling bearings, static load rating corresponds to:

Question 58: In cam design, pressure angle is maximum when:

Question 59: In fatigue design, endurance limit is affected by:

Question 60: In gear design, module is defined as:

Question 61: In shaft design, critical speed is defined as:

Question 62: In bolted joints, proof load is defined as:

Question 63: In journal bearings, coefficient of friction decreases with:

Question 64: In power transmission, efficiency of screw jack is low due to:

Question 65: In spur gears, involute profile is preferred because:

Question 66: In spring design, stiffness is defined as:

Question 67: In fatigue failure, crack initiation usually starts at:

Question 68: In cam-follower systems, roller followers are preferred over flat followers because:

Question 69: In bearing selection, L10 life represents:

Question 70: In gear design, face width is generally chosen based on:

Question 71: In fatigue design, Gerber parabola is preferred over Goodman line when:

Question 72: In hydrodynamic lubrication, load carrying capacity is primarily dependent on:

Question 73: In spur gear tooth design, dynamic load increases due to:

Question 74: In a flat belt drive, crowning of pulley is provided to:

Question 75: In rolling bearings, the life varies inversely with load raised to power:

Question 76: In shaft design under fluctuating torsion, endurance limit is modified by:

Question 77: In cam design, base circle radius is chosen based on:

Question 78: In riveted joints, tearing failure occurs when:

Question 79: In power screws, overhauling occurs when:

Question 80: In fatigue loading, S-N curve represents relation between:

Question 81: In hydrodynamic bearings, friction coefficient is minimum in:

Question 82: In spur gears, interference can be avoided by:

Question 83: In belt drives, initial tension is required to:

Question 84: In welded joints, residual stresses are caused due to:

Question 85: In rolling bearings, equivalent dynamic load is used for:

Question 86: In spring design, Wahl factor increases with:

Question 87: In cam-follower systems, flat follower experiences:

Question 88: In fatigue failure, endurance limit is defined as:

Question 89: In gear design, addendum is defined as:

Question 90: In shaft design, torsional rigidity is defined as:

Question 91: In bolted joints, fatigue failure is minimized by:

Question 92: In journal bearings, clearance affects:

Question 93: In gear trains, compound gear trains are used to:

Question 94: In belt drives, maximum stress occurs at:

Question 95: In welded joints, factor of safety is higher because:

Question 96: In rolling bearings, lubrication is essential to:

Question 97: In cam design, follower acceleration should be limited to:

Question 98: In fatigue design, factor of safety is applied on:

Question 99: In spur gears, dedendum is defined as:

Question 100: In shaft design, hollow shafts are preferred over solid shafts because:

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⚙️ Machine Design MCQ Questions with Answers & Live Score

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