MEIE $4102$: MACHINE DESIGN I

M

FINAL EXAM: DECEMBER $30,2023$

$($FL$-2023)$

FI

PART $1$: ANSWER THE FOLLOWING QUESTIONS $[15$ MARKS$]$

$[1$ Mark$]$ A gear of $28cm$ pitch circle diameter has $40$ teeth. The circular pitch will nearly I

a$)44m\frac{m}{?}$ tooth

b$)33m\frac{m}{?}$ tooth

c$)11m\frac{m}{?}$ tooth

d$)22m\frac{m}{?}$ tooth

$[1$ Mark$]$ All of the following the common failure criteria used for shaft design except

a$)$ DE$-$Goodman

TOTAL MARKS: $100$ MARKS, TIME: $3$ HRS$.$

PART $1$: ANSWER THE FOLLOWING QUESTIONS $[15$ MARKS$]$

c$)$ DE$-$ASME Elliptic

b$)DE-$Gerber

$[1$ Mark$]$ The path of contact in d$)$ DE$-$Coulomb

a$)$ Along an involute

c$)$ Along the base circle

b$)$ Along a straight line

$[1$ Mark$]$ Which material property stresses?

a$)$ Brittleness

b$)$ Hardness

c$)$ Ductility

d$)$ Toughness

$[1$ Mark$]$ In shaft design for stress, the distortion energy theory is used to assess:

a$)$ Thermal resistance

b$)$ Static strength

c$)$ Fatigue strength

d$)$ Impact resistance

$[1$ Mark$]$ When designing a shaft for stress, which factor is not typically considered?

a$)$ Fatigue strength

b$)$ Corrosion resistance

c$)$ Creep resistance

d$)$ Static strength

$[1$ Mark$]$ True or False: Tighter bearing tolerances are always preferred for achieving higb performance.

a$)$ True

b$)$ False

$[1$ Mark$]$ Excessive bearing noise can indicate which of the following issues?

a$)$ Wear and damage

b$)$ Misalignment

c$)$ Poor Iubrication

d$)$ All of the choices

$[1$ Mark$]$ True or False: The primary cause of failure in a properly maintained and lubricated rolling$-$contact bearing is misalignment.

a$)$ True

b$)$ False

$[1$ Mark$]$ In a variable pitch spring, the pitch of the coils:

a$)$ Varies along the length

b$)$ Is inversely proportional to the load

c$)$ Remains constant

d$)$ Is directly proportional to the load

$[1$ Mark$]$ In a torsion spring, the energy is stored primarily through:

a$)$ Tension

b$)$ Twisting

c$)$ Compression

d$)$ Bending

$[1$ Mark$]$ Leaf springs are best suited for applications requiring

a$)$ High frequency vibration isolation

b$)$ Small space utilization

c$)$ Precision control

d$)$ Low frequency vibration isolation

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