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This set of Design of Machine Elements Multiple Choice Questions & Answers (MCQs) focuses on Design Of Machine Elements Set 7
Q1 | Cast surfaces have good finishing.
- true
- false
Q2 | In forging, metal is in which of the following stage?
- elastic
- plastic
- can be in any stage
- rigid
Q3 | Among casting, forging and forging which has the slowest rate of production?
- casting
- forging
- machining
- all have equal rate of production
Q4 | In manual assembly, cost of screw is higher than the cost of driving a screw.
- true
- false
Q5 | Maximum carbon content in welding is usually limited to
- 0.22%
- 0.8%
- 1.5%
- 2%
Q6 | 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
Q7 | 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
Q8 | 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
Q9 | 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
Q10 | Quality control charts doesn’t depend on which factor?
- normal distribution
- random sampling
- independence between samples
- binomial distribution
Q11 | 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
Q12 | 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
Q13 | Stress in a beam due to simple bending is
- directly proportional
- inversely proportional
- curvilinearly related
- none of the mentioned
Q14 | Which stress comes when there is an eccentric load applied?
- shear stress
- bending stress
- tensile stress
- thermal stress
Q15 | What is the expression of the bending equation?
- m/i = σ/y = e/r
- m/r = σ/y = e/i
- m/y = σ/r = e/i
- m/i = σ/r = e/y
Q16 | 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
Q17 | 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
Q18 | 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
Q19 | Stress intensity factor is the critical value of stress at which crack extension occurs.
- true
- false
Q20 | The critical value at which crack extension occurs is called
- stress intensity factor
- toughness
- fracture toughness
- none of the mentioned
Q21 | Fracture toughness does not depend upon geometry of the part containing crack
- true
- false
Q22 | How many modes are there for crack propagation?
- 2
- 3
- 4
- 5
Q23 | A curved beam has neutral axis is curved while loaded and straight when unloaded.
- true
- false
Q24 | 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
Q25 | If for a curved beam of trapezoidal cross section, radius of neutral axis is 89.1816mm and radius of centroidal axis is 100mm, then find the bending stress at inner fibre whose radius is 50mm. Area of cross section of beam is 7200mm² and the beam is loaded with 100kN of load.
- 97.3
- 95.8
- 100.6
- none of the mentioned