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This set of Design of Machine Elements Multiple Choice Questions & Answers (MCQs) focuses on Design Of Machine Elements Set 11
Q1 | In which of the following bonding theory, water molecules break down to form H+ and OH- ions?
- electrostatic bonding theory
- hot strength theory
- surface tension theory
- block and wedge theory
Q2 | What does the clay particle absorb in electrostatic bonding theory?
- complete water
- h+ ions
- oh–ions
- sand grains
Q3 | For bonding action of clays, what is the amount of water needed?
- 1.5%-8%
- 3.5%-11%
- 4.5%-12%
- 5.5%-13%
Q4 | What is the amount of sea coal needed in cast irons for small casting moulding sands?
- 1%
- 2%
- 3%
- 4%
Q5 | What is the amount of sea coal needed in cast irons for large green casting moulding sands?
- 10%
- 15%
- 20%
- 25%
Q6 | Pitch maybe used up to what percent?
- 1%
- 2%
- 3%
- 4%
Q7 | Which of the following increases the dry strength of the sand?
- iron oxides
- fuel oils
- cereals
- dextrin and molasses
Q8 | Cereals improve flowability and lower collapsibility.
- true
- false
Q9 | How much should fuel oil be added to increase the moulding ability of sand?
- 0.01% – 0.1%
- 0.02% – 0.2%
- 0.03% – 0.3%
- 0.04% – 0.4%
Q10 | Which of the following function can the spring perform?
- store energy
- absorb shock
- measure force
- all of the mentioned
Q11 | The helix angle is very small about 2⁰. The spring is open coiled spring.
- yes
- it is closed coiled spring
- that small angle isn’t possible
- none of the listed
Q12 | The helical spring ad wire of helical torsion spring, both are subjected to torsional shear stresses.
- true
- false
- topic 4.1 various types of springs, optimization of helical springs - rubber springs
Q13 | The longest leaf in a leaf spring is called centre leaf.
- it is called middle leaf
- it is called master leaf
- yes
- none of the listed
Q14 | Multi leaf springs are not recommended for automobile and rail road suspensions.
- true
- false
Q15 | The spring index is the ratio of wire diameter to mean coil diameter.
- true
- false
Q16 | If spring index=2.5, what can be concluded about stresses in the wire?
- they are high
- they are negligible
- they are moderate
- cannot be determined
Q17 | A spring with index=15 is prone to buckling.
- true
- false
Q18 | If the spring is compressed completely and the adjacent coils touch each other,the the length of spring is called as?
- solid length
- compressed length
- free length
- none of the mentioned
Q19 | If number of coils are 8 and wire diameter of spring 3mm, then solid length is given by?
- none of the listed
- 27mm
- 24mm
- 21mm
Q20 | Compressed length is smaller than the solid length.
- true
- false
Q21 | Pitch of coil is defined as axial distance in compressed state of the coil.
- yes
- it is measured in uncompressed state
- it is same in uncompressed or compressed state
- none of the listed
Q22 | If uncompressed length of spring is 40mm and number of coils 10mm, then pitch of coil is?
- 4
- 40/9 c) 40/11
- d) none of the mentioned
Q23 | Active and inactive, both types of coils support the load although both don’t participate in spring action.
- active coils don’t support the load
- inactive coils don’t support the load
- both active and inactive don’t support the load
- both active and inactive support the load
Q24 | The coefficient of fluctuation of speed is the of maximum fluctuation of speed and the mean speed.
- product
- ratio
- sum
- difference
Q25 | In a turning moment diagram, the variations of energy above and below the mean resisting torque line is called
- fluctuation of energy
- maximum fluctuation of energy
- coefficient of fluctuation of energy
- none of the mentioned