Design Of Machine Elements Set 1

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This set of Design of Machine Elements Multiple Choice Questions & Answers (MCQs) focuses on Design Of Machine Elements Set 1

Q1 | Stressed parts are always kept in tension.
  • true
  • false
Q2 | Which process allows controlling grain structure of the product?
  • casting
  • forging
  • none of the mentioned
  • die casting
Q3 | Cast surfaces have good finishing.
  • true
  • false
Q4 | In forging, metal is in which of the following stage?
  • elastic
  • plastic
  • can be in any stage
  • rigid
Q5 | Among casting, forging and forging which has the slowest rate of production?
  • casting
  • forging
  • machining
  • all have equal rate of production
Q6 | In manual assembly, cost of screw is higher than the cost of driving a screw.
  • true
  • false
Q7 | Maximum carbon content in welding is usually limited to
  • 0.22%
  • 0.8%
  • 1.5%
  • 2%
Q8 | Why tolerances are given to the parts?
  • because it’s impossible to make perfect settings
  • to reduce weight of the component
  • to reduce cost of the assembly
  • to reduce amount of material used
Q9 | What is bilateral tolerance?
  • total tolerance is in 1 direction only
  • total tolerance is in both the directions
  • may or may not be in one direction
  • tolerance provided all over the component body
Q10 | What is mean clearance?
  • maximum size of hole minus maximum size of shaft
  • minimum size of hole minus minimum size of shaft
  • mean size of hole minus mean size of shaft
  • average of both size of shaft and hole
Q11 | Which of the following is incorrect about tolerances?
  • too loose tolerance results in less cost
  • tolerance is a compromise between accuracy and ability
  • too tight tolerance may result in excessive cost
  • fit between mating components is decided by functional requirements
Q12 | Quality control charts doesn’t depend on which factor?
  • normal distribution
  • random sampling
  • independence between samples
  • binomial distribution
Q13 | If a clearance fit is present between shaft and hole, what is the tolerance on shaft or hole for a complete interchangeable approach?
  • ½ of maximum clearance – ½ of minimum clearance
  • ¼ of maximum clearance – ¼ of minimum clearance
  • maximum clearance – minimum clearance
  • ¾ of maximum clearance – ¾ of minimum clearance
Q14 | A beam is said to be of uniform strength, if
  • b.m. is same throughout the beam
  • shear stress is the same through the beam
  • deflection is the same throughout the beam
  • bending stress is the same at every section along its longitudinal axis
Q15 | Stress in a beam due to simple bending is
  • directly proportional
  • inversely proportional
  • curvilinearly related
  • none of the mentioned
Q16 | Which stress comes when there is an eccentric load applied?
  • shear stress
  • bending stress
  • tensile stress
  • thermal stress
Q17 | On bending of a beam, which is the layer which is neither elongated nor shortened?
  • axis of load
  • neutral axis
  • center of gravity
  • none of the mentioned
Q18 | The bending stress is  
  • directly proportional to the distance of layer from the neutral layer
  • inversely proportional to the distance of layer from the neutral layer
  • directly proportional to the neutral layer
  • does not depend on the distance of layer from the neutral layer
Q19 | Consider a 250mmx15mmx10mm steel bar which is free to expand is heated from 15C to 40C. what will be developed?
  • compressive stress
  • tensile stress
  • shear stress
  • no stress
Q20 | The safe stress for a hollow steel column which carries an axial load of 2100 kN is 125 MN/m2. if the external diameter of the column is 30cm, what will be the internal diameter?
  • 25 cm
  • 26.19cm c) 30.14 cm
  • d) 27.9 cm
Q21 | Stress intensity factor is the critical value of stress at which crack extension occurs.
  • true
  • false
Q22 | Fracture toughness does not depend upon geometry of the part containing crack
  • true
  • false
Q23 | How many modes are there for crack propagation?
  • 2
  • 3
  • 4
  • 5
Q24 | A curved beam has neutral axis is curved while loaded and straight when unloaded.
  • true
  • false
Q25 | The bending stress in a straight beam varies linearly with the distance from neural axis like that in a curved beam.
  • true
  • false
  • topic 1.4 impact and shock loading - calculation of principle stresses for various load combinations, eccentric loading - curved beams - crane hook and €ˌc€„¢ frame