FREE Master of Engineering Machine Design Questions and Answers
What sort of welding in machine design use an oxygen-acetylene gas?
Thermit welding involves first preparing a mold, after which thermit is added to bond the metals. An arc is heated and used to combine metal pieces in an electric arc. Metals are joined using an impact force in forge welding. In gas welding, an oxy-acetylene flame is produced by burning the gas in the presence of a torch.
What kind of welding joint is the one in the list below not one?
The welding process for a lap joint involves placing two parts or plates over one another. It could be of the transverse or parallel variety. When two parts are placed by their ends and welded together, a butt joint is created. Another sort of junction where parts are arranged perpendicular to one another and then joined together by welding is a tee joint. One variety of rivet junction is the single strap joint.
Which of the following, when applied to power screws, is the right formula to calculate torque when the load is reduced during machine design? (W=weight in N, =angle of inclination, =angle of friction)
When a torque is applied, the load goes downward along the screw's helical route, which forms the triangle's hypotenuse, leading to a change in the base's circumference and perpendicular distance. W tan(θ – ϕ) s the result of resolving the forces acting on the weight.
Which one of the following connects two rotating shafts?
A key is an object that connects a component of a machine to a shaft. Power is transferred from one shaft to another using gears and belt drives. To connect two rotating shafts, couplings are utilized.
Which of the following is a multi-leaf spring's rebound clips used for?
All of the bolts are clamped using bolt holes. To hold all the leaves, an eye for connecting a member, and rebound clips to distribute the load from the master to graduated leaves are necessary.
Which of the following represents a screw in dominance?
A power screw is a mechanical tool that can be used for power transfer as well as lifting or lowering heavy items with little effort. It is easy to design, has a huge load bearing capability, and operates quietly. However, the power lost in friction makes it inefficient. Furthermore, wear becomes a significant issue as a result of friction, and mechanical advantage increases since less effort is required.
Which of the following is false regarding stiff and flexible connections in machine design?
In comparison to flexible couplings, rigid couplings cost less. Flexible couplings come with extra safety components like bushes to dampen shock and vibration. Any misalignment of the shaft axes is incompatible with rigid couplings.
Which of the ensuing lines is the most cost-effective?
The Soderberg line, which is the safest line, will take the most money to design for, followed by the goodman line and the Gerber parabola.
Which of the following failure types cannot occur in a riveted joint?
A riveted junction is a form of joint that uses a rivet to attach two components or plates together. In the examination of a riveted joint, the most likely failure modes are shear failure of the rivet, plate crushing failure, and tensile failure of the plate between rivets.
Which of the following components only experiences the bending moment when transferring torque?
An axle is a mechanical component that transmits torque, supports spinning objects like wheels, is subject to bending moments from transverse loads placed on them, and supports rotating objects. A simple axle supporting the rear wheels of a car can be seen there.
Which of the following statements regarding roller bearings and ball bearings is correct?
The majority of the time, cylindrical rollers are used in roller bearings. Practically speaking, a roller bearing has a larger area of contact than a ball, which results in a greater heat loss from friction.
Which of the following expressions is incorrect for rigidity-based shaft design?
The formula used for shaft design based on stiffness is T / J = Gθ / L, where J is the polar moment of inertia, T is the torsional moment, is the angle of twist, and L is the length of the shaft.
Which of the subsequent is not a transmission shaft type?
A shaft used to transfer power from a source to an application is a transmission shaft (eg: a machine). The two different kinds of transmission shafts are line shaft and countershaft. A machine shaft is an essential component of the whole. like the crankshaft.
What form of lever has the effort situated between the load and fulcrum?
It is referred to as a first type of lever if the fulcrum is situated between the load and the effort. It is a second form of lever if the load is between the fulcrum and the effort, while a third type of lever requires the effort to be between the load and the fulcrum.
Which of the following is an accurate representation of a fillet joint?
The symbol for two parallel lines with an arc above them is a square butt. A triangle with an arc above it is indicated by a single V-butt. A right-angled triangle denotes a fillet joint, while a plain triangle denotes a projection.
According to ASME code, what is the maximum shear stress for a material with keyway effect and ultimate tensile strength (Sut)?
The maximum shear stress for a material with ultimate tensile strength (Sut) is 0.18 Sut, as stated in the ASME code for shaft design. Additionally, the value must be diminished by 25% because to the keyway impact, resulting in 0.18 x 0.75 x Sut.