Design Of Machine Elements Set 1 MCQs

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 Ã¢Â‚¬ËŒcÃ¢Â‚¬Â„¢ frame