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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