Machine Design MCQ (Multiple Choice Questions)

Here are 1000 MCQs on Machine Design (Chapterwise).

1. Which of the following in power screws is the correct equation for torque if the load is lowered while designing a machine? ( W: Weight in N, θ: Angle of inclination, ϕ: Friction angle)
a) W tan (θ / ϕ)
b) W tan (θ x ϕ)
c) W tan (θ + ϕ)
d) W tan (θ – ϕ)
View Answer

Answer: d
Explanation: When a torque is applied, the load moves down on the helical path of screw, which is the hypotenuse of triangle, lead the perpendicular distance and circumference the base of the triangle. By resolving the forces acting on the weight, we get, W tan (θ – ϕ).

2. Which of the following is a dominance of power screw?
a) Large load carrying capacity
b) High efficiency
c) Wear of screw is reduced
d) Mechanical advantage is lowered
View Answer

Answer: a
Explanation: A power screw is a mechanical device which can be used to lift or lower the heavy loads with the aid of a small effort and also for the transmission of power. It has a large load carrying capacity, simple to design, provides noiseless service. But, it has poor efficiency due to the power lost in friction. Further, due to friction, wear becomes a serious problem and mechanical advantage is increased as the effort applied is less.

3. What is the maximum shear stress for a material of ultimate tensile strength (Sut) with keyway effect according to ASME code?
a) 0.18 Sut
b) 0.135 Sut
c) 0.30 Sut
d) 0.225 Sut
View Answer

Answer: b
Explanation: According to ASME code for shaft design, the maximum shear stress for a material of ultimate tensile strength (Sut) is 0.18 Sut. Further, with keyway effect, the value is to be reduced by 25 % which gives, 0.18 x 0.75 x Sut.

4. Which of the following elements transfers torque and is only subjected with the bending moment?
a) Brake
b) Clutch
c) Axle
d) Belt drive
View Answer

Answer: c
Explanation: An axle is a machine element that supports rotating elements such as wheels, and is subjected to bending moments due to transverse loads applied on them and transmits torque. An axle can be simply seen in the rear part of a vehicle, supporting rear wheels.

5. Which of the following joins two rotating shafts to each other?
a) Key
b) Coupling
c) Gear
d) Belt drive
View Answer

Answer: b
Explanation: Key is a device that joins a machine element to a shaft. Gears and belt drives are devices that are used to transfer power from one shaft to another. Couplings are used to join two rotating shafts.
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6. Which of the following line is the most economical?
a) Goodman line
b) Soderberg line
c) Gerber parabola
d) Lagrange line
View Answer

Answer: c
Explanation: As soderberg line is the most safest line, the cost required to design according to this criteria will be more, followed by goodman line and gerber parabola.

7. Which of the following expression is not correct for designing a shaft according to rigidity?
a) T = GθJ / L
b) J = TL / Gθ
c) θ = TL / GJ
d) L = GθT / J
View Answer

Answer: d
Explanation: According to shaft design on rigidity basis, the following expression is used: T / J = Gθ / L, where J: polar moment of inertia, T: torsional moment, θ: angle of twist, L: length of shaft, G: modulus of rigidity.

8. In machine design, which type of welding uses an oxygen-acetlyene gas?
a) Thermit welding
b) Electric arc welding
c) Gas welding
d) Forge welding
View Answer

Answer: c
Explanation: In thermit welding, a mould is prepared and then thermit is placed to join the metals. In electric arc, an arc is used to heat and join the parts of metal. Forge welding uses an impact force for joining of metals. In gas welding, oxy-acetylene gas is burned in the presence of a torch to create a pointed flame.

9. Which of the following is not a type of transmission shaft?
a) Crankshaft
b) Countershaft
c) Transmission shaft
d) Line shaft
View Answer

Answer: a
Explanation: Transmission shaft is a shaft used for the transmission of power from source to an application (eg: a machine). Line shaft and countershaft are the types of transmission shaft. A machine shaft is an integral part of itself. Eg: crankshaft.

10. In machine design, which of the following is not true for rigid and flexible couplings?
a) Rigid couplings are expensive than flexible couplings
b) Flexible couplings can tolerate any slight misalignment between axes of shafts
c) Flexible couplings can absorb shocks and vibrations
d) Rigid couplings cannot tolerate slight misalignment between axes of shafts
View Answer

Answer: a
Explanation: Rigid couplings are inexpensive as compared to flexible couplings. Flexible couplings are provided with additional safety parts such as bushes to absorb shock and vibrations. Rigid couplings cannot tolerate any misalignment between the axes of shafts.

11. Which is not a possible type of failure in a riveted joint?
a) Crushing failure of the plate
b) Shear failure of rivet
c) Tensile failure of the plate between rivets
d) Shear failure of plate
View Answer

Answer: d
Explanation: A riveted joint is a type of joint used to join two components or plates with the help of a rivet. The possible failures in the analysis of a riveted joint are mainly shear failure of rivet, crushing failure of the plate, and tensile failure of the plate between rivets.

12. Which of the following is true about the roller bearing in comparison with ball bearing?
a) Power lost in friction is more
b) Axial dimensions are less
c) Radial dimensions are more
d) They have point contact
View Answer

Answer: a
Explanation: Roller bearing is a bearing which uses cylindrical roller in most of the cases. Practically, the area of contact of roller is more as compared to ball, so, the heat lost in friction is more as compared to ball bearing.

13. Which of the following correctly symbolizes a fillet joint?
a) A right angled triangle
b) Two parallel lines with an arc above them
c) A triangle with an arc above it
d) A triangle
View Answer

Answer: a
Explanation: A square butt designates, two parallel lines with an arc above them. A single V butt designates, a triangle with an arc above it. A simple triangle means a projection and a right angled triangle means a fillet joint.

14. Which of the following is not a type of welding joint?
a) Lap joint
b) Butt joint
c) Tee joint
d) Single strap joint
View Answer

Answer: d
Explanation: Lap joint is a joint in which welding is done by overlapping two components or plates. It may be of parallel or transverse type. Butt joint is done when two components are placed by their ends and welded. Tee joint is also a type of joint where components are placed perpendicular to each other and then welded at their intersections. Single strap joint is a type of rivet joint.
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15. Which of the following is the function of rebound clips in a multi-leaf spring?
a) Helps to share the load from master leaf to graduated leaves
b) Hold all the leaves of the spring
c) Engage the bolts to clamp the leaves
d) Attach a member or component to
View Answer

Answer: a
Explanation: Bolt holes are used to engage all the bolts for clamping. A central clamp is required to hold all the leaves, an eye for attaching a member and rebound clips to share the load from master to graduated leaves.

16. In which of the following type of lever the effort is located between the load and fulcrum?
a) First type
b) Second type
c) Third type
d) Fourth type
View Answer

Answer: c
Explanation: If the fulcrum is located between load and effort, it is called first type of lever. If load is located between the fulcrum and effort, then it is of second type and for third class of lever, the effort must be between load and fulcrum.

17. Which of the following is not the cause of stress concentration?
a) Abrupt changes in cross-section
b) Discontinuity in the component
c) Machining scratches
d) Point load applied on the component
View Answer

Answer: d
Explanation: Stress concentration is the development of high stresses due to changes in cross-section, irregularities and discontinuities in the component, machining scratches,etc which causes the separation of flow lines.

18. Which of the following straight-line joins endurance limit(Se) on the stress amplitude axis and yield strength (Syt) on the mean stress axis?
a) Soderberg line
b) Modified goodman line
c) Gerber line
d) Goodman line
View Answer

Answer: a
Explanation: Gerber line is a parabola joining Se on stress amplitude (y-axis) and Sut on mean stress (x-axis). A goodman line is a straight line whichjoins Se on y-axis and Sut on x-axis. A soderberg line is a straight line which joins Se on y-axis and Syt on x-axis. A modified goodman line is a combination of lagrange and goodman lines.

19. Which of the following shaft are the integrals or equally spaced lines made on a shaft?
a) Stepped shaft
b) Spline shaft
c) Cam shaft
d) Crankshaft
View Answer

Answer: b
Explanation: Splines are a type of shaft in which there are equally spaced grooves mainly used to transmit high torque and due to the presence of grooves, the load is shared equally.
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20. Which of the following is not the method to reduce stress concentration?
a) Usage of additional notches and holes
b) Usage of fillet radius
c) Usage of additional discontinuities
d) Usage of sharp corners
View Answer

Answer: d
Explanation: For the reduction of stress concentration, several methods are used like using multiple notches, using additional discontinuities, drilling additional holes. Using fillet radius, to avoid sharp corners. These methods will ultimately smoothen the flow and flowlines will be less deviated.

21. Which of the following is not a type of sunk key?
a) Gib headed key
b) Woodruff key
c) Square key
d) Hollow saddle key
View Answer

Answer: d
Explanation: A sunk key is a type of key which fits halfway in the shaft and the other half lies in the hub. Further, the main types of sunk keys are square key, rectangular key, gib headed key, woodruff key, parallel sunk key. Hollow saddle key is a type of saddle key.

22. Which of the following is not the function of a spring?
a) They are used for the measurement of force and to control motion
b) They are used to absorb shocks and vibrations
c) They are used to store energy
d) They are used to measure displacement
View Answer

Answer: d
Explanation: Spring is a mechanical device which changes its size under deflection due to the application of force and regains its original size when the load is removed. The functions of a spring are to measure forces such as in spring balance, absorb shocks , and are also used to store energy.

23. Which of the following materials are subjected to the most severe stress concentration?
a) Ductile materials under fluctuating load
b) Brittle materials under static and fluctuating load
c) Brittle materials under fluctuating load
d) Ductile materials under static load
View Answer

Answer: b
Explanation: The stress concentration effects is most severe in brittle materials due to their inability for plastic deformation. However, in ductile materials, until the material do not reach yield point, there is no stress concentration.

24. Which of the following is not true for a good coupling?
a) It should be capable for transmitting power from one shaft to another
b) It should keep shafts in proper alignment
c) It should be easy to assemble and disassemble for repair and maintenance
d) If there is small misalignment between the shafts, the coupling cannot transmit power
View Answer

Answer: d
Explanation: A coupling is a device which is used to connect two shafts rigidly and transmit power from one shaft to another shaft. The requirements of a good coupling is to transmit power even if there is small misalignment, a coupling should be easy to assemble and disassemble for maintenance purpose.

25. Which of the following type of failures does modified goodman line combines?
a) Fatigue and yield
b) Bending and fatigue
c) Yield and bending
d) Fatigue, bending and yield
View Answer

Answer: a
Explanation: Modified goodman line is a modified version of goodman line. The failure point ‘Sut’ on mean stress axis is shifted to ‘Syt’ for the safety of the component with the help of Lagrange’s line which joins ‘Syt’ on both y and x axes.

26. Which of the following mechanical devices transfers or multiplies load with an application of small effort?
a) Gears
b) Shafts
c) Levers
d) Bearings
View Answer

Answer: c
Explanation: Levers are mechanical devices in the form a rigid bar which multiplies or transfer the force with a small effort with the help of a fulcrum.

27. Which of the following coupling consists of only sleeve and a key?
a) Muff coupling
b) Flexible coupling
c) Rigid coupling
d) Universal coupling
View Answer

Answer: a
Explanation: Rigid couplings or flexible coupling have flanges and a nut bolt arrangement. Universal couplings have two intersecting forks, collars, centre block, pins and are used to connect two intersecting shafts. Muff coupling have a sleeve and a key arrangement.

28. Which of the following bearings cannot take radial loads?
a) Taper roller bearing
b) Thrust ball bearing
c) Angular contact bearing
d) Deep groove ball bearing
View Answer

Answer: b
Explanation: Taper roller bearing, angular contact bearing and deep grove ball bearing can take loads in both the directions, axial as well as in radial. Thrust ball bearing can take only axial loads.

29. Which of the following theory of failure is mostly used for ductile materials?
a) Maximum principal stress theory
b) Maximum shear stress theory
c) Distortion energy theory
d) Haigh’s theory
View Answer

Answer: b
Explanation: For brittle materials, maximum principal stress theory is used as brittle components fail by fracture instead of yielding. Further, Haigh’s theory is related with maximum strain energy. For ductile materials, maximum shear stress theory is used as yielding is the failure criterion. Distortion energy theory is also used for ductile materials, only if the components require close dimensional accuracy.

30. Which of the following forms of thread can transmit power in only one direction?
a) Acme threads
b) Trapezoidal threads
c) Square threads
d) Buttress threads
View Answer

Answer: d
Explanation: Buttress threads have a thread angle of 45°, which are only inclined in one given direction, so the power is transmitted in that direction only. Acme, trapezoidal and square threads can transmit power in either direction.

31. Which of the following line is the safest?
a) Goodman line
b) Soderberg line
c) Gerber parabola
d) Lagrange line
View Answer

Answer: b
Explanation: As gerber parabola represents the average of all failure points, the region below and above the parabola is not safe. The region below the goodman line is safe, but the region above it consists of some failure points.There are no failure points below and above the soderberg line, so, it is the safest.


Chapterwise Multiple Choice Questions on Machine Design

Machine Design MCQ - Multiple Choice Questions and Answers

Our 1000+ MCQs focus on all topics of the Machine Design subject, covering 100+ topics. This will help you to prepare for exams, contests, online tests, quizzes, viva-voce, interviews, and certifications. You can practice these MCQs chapter by chapter starting from the 1st chapter or you can jump to any chapter of your choice.
  1. Engineering Materials
  2. Manufacturing Considerations in Machine Design
  3. Design Against Static Load
  4. Design Against Fluctuating Load
  5. Power Screws
  6. Threaded Joints
  7. Welded and Riveted Joints
  8. Shafts, Keys and Couplings
  9. Springs
  10. Friction Clutches, Brakes, Belt Drivers and Chain Drivers
  11. Rolling Contact Bearings, Spur Gears and Helical Gears
  12. Bevel Gears, Worm Gear Flywheel
  13. Cylinders and Pressure Vessels and Design of IC Engine Components
  14. Miscellaneous Machine Elements

1. Machine Design MCQ on Engineering Materials

The section contains Machine Design multiple choice questions and answers on Engineering Material Properties, Stress and Strain diagrams, carbon steels, steel case hardening, steel and aluminium alloys, ceramics, plastics and die casting alloys.

  • Stress Strain Diagrams & Mechanical Properties
  • Plain Carbon Steels
  • Heat Treatment & Case Hardening of Steels
  • Cast Steel & Aluminium Alloys
  • Copper Alloys & Die Casting Alloys
  • Ceramics & Plastics
  • 2. Multiple Choice Question on Manufacturing Considerations in Machine Design

    The section contains Design of Machines questions and answers on design considerations and hot and cold working of metals.

  • Design Cosiderations
  • Fits & Hot and Cold Working of Metals
  • 3. Design Against Static Load MCQ

    The section contains Machine Design MCQs on failure modes and stresses, cotter and knuckle joints, principal and thermal stresses, levers and fracture mechanics.

  • Modes of Failure & Stresses
  • Cotter Joint
  • Knuckle Joint
  • Principal Stresses & Theories of Elastic Failure
  • Levers
  • Fracture Mechanics & Thermal Stresses
  • 4. Design Against Fluctuating Load Multiple Choice Question

    The section contains Design of Machine multiple choice questions and answers on stress concentration, fluctuating stresses, fatigue failures and its factors.

  • Stress Concentration and its Factors
  • Fluctuating Stresses & Fatigue Failure
  • 5. Machine Design MCQ on Power Screws

    The section contains Machine Design questions and answers on concepts of power screws, self locking screws and screw efficiency.

  • Power Screws & Self Locking Screws
  • Efficiency of Screws
  • 6. MCQ on Threaded Joints in Machine Design

    The section contains Design of Machine MCQs on power screws, screw jack, threaded joints, uniform bolt strength, and loads based on the principle of eccentricity.

  • Threaded Joints:Basics & Cap Screws
  • Power Screws Numericals
  • Screw Jack
  • Bolts of Uniform Strength & Locking Devices
  • Eccentric Loaded Bolted Joints
  • Eccentric Loaded Perpendicular to axis of Bolt
  • Eccentric Load on Circular Base
  • 7. Machine Design Multiple Choice Question on Welded and Riveted Joints

    The section contains Machine Design multiple choice questions and answers on various concepts which include welded joints, butt joints, fillet joints, riveted joints, various joints terminology and lap joints based on eccentricity principle.

  • Welded Joints
  • Butt Joints&FIllet Joins
  • Unsymmetrically Loaded Welded Joints
  • Welded Joints Subjected to Bending Moments
  • Riveted Joints
  • Rivet Heads & Terminology
  • Failures in Rivets
  • Longitudinal Butt & Circumferential Lap Joints
  • Eccentrically Loaded Riveted Joints
  • 8. MCQ on Shafts, Keys and Couplings in Machine Design

    The section contains Design of Machine questions and answers on transmission shafts, shaft design and keys, couplings and pin flexible coupling.

  • Transmission Shafts
  • Shaft Design
  • Keys
  • Couplings
  • Clamp Coupling & Rigid Flage Coupling
  • 9. Machine Design Multiple Choice Question on Springs

    The section contains Machine Design MCQs on spring design, helical springs, spiral springs, concentric springs and multi leaf springs.

  • Springs
  • Design of Helical Springs
  • Concentric & Spiral Springs
  • Multi Leaf Spring
  • 10. Machine Design MCQ on Friction Clutches, Brakes, Belt Drives and Chain Drives

    The section contains Design of Machine multiple choice questions and answers on friction clutches, cone clutches, centrifugal clutches, brakes, block brakes, expanding brakes, belt drives and constructions, chain drives and its design.

  • Friction Clutches
  • Cone & Centrifugal Clutches
  • Brakes
  • Block Brake
  • Internal Expanding Brake
  • Band Brakes & Disk Brakes
  • Belt Drives
  • Belt Constructions
  • Belt Construction II & V Belts
  • Belt Tensioning Methods
  • Chain Drives
  • Design of Chain Drive
  • 11. Multiple Choice Question on Rolling Contact Bearings, Spur Gears and Helical Gears in Machine Design

    The section contains Machine Design questions and answers on bearings and its types, load carrying capacities, sliding contact bearings, viscosity, spur gears and its terminology, gear trains and helical gears.

  • Bearings
  • Types of Bearings
  • Static & Dynamic Load Carrying Capacity
  • Sliding Contact Bearings
  • Viscosity
  • Hydrodynamics Bearing
  • Gears
  • Terminology of Spur Gears
  • Gear Trains
  • Inerference, Undercutting & Backlash
  • System of Gear Tooth
  • Helical Gears
  • Strength of Helical Gears
  • 12. MCQ on Bevel Gears, Worm Gears and FlyWheel in Machine Design

    The section contains Design of Machine MCQs on bevel gears and its terminology, bevel gear strength, worm gears and flywheel coefficient.

  • Bevel Gears
  • Terminology of Bevel Gears
  • Strength of Bevel Gears
  • Worm Gears
  • Flywheel
  • Coefficient of Flywheel
  • 13. Multiple Choice Question on Cylinders and Pressure Vessels and Design of IC Engine Components

    The section contains Machine Design multiple choice questions and answers on compound cylinder, pressure vessels, gaskets and IC engine component design.

  • Cylinder & Pressure Vessels
  • Compound Cylinder & Gaskets
  • Design of IC Engine Compoents
  • 14. MCQ on Miscellaneous Machine Elements

    The section contains Design of Machine questions and answers on miscellaneous machine elements like pressure vessels, oil seals, wire ropes and its stresses and column bucking.

  • Unfired Pressure Vessels,Oil Seals & Wire Ropes
  • Stresses in Wire Ropes
  • Buckling of Columns
  • If you would like to learn "Machine Design" thoroughly, you should attempt to work on the complete set of 1000+ MCQs - multiple choice questions and answers mentioned above. It will immensely help anyone trying to crack an exam or an interview.

    Wish you the best in your endeavor to learn and master Machine Design!

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