Machine Design (2171909) MCQs

MCQs of Design of Cranes

Showing 31 to 36 out of 36 Questions
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31.

An elevator is assembled to raise equipment to a height of 22m. It is estimated that the maximum weight of the material to be raised is 4.9kN. It is observed acceleration in such cases is 1.2m/s².10mm diameter wire ropes with fiber core are used. The tensile designation of the wire is 1500. The number of rope wires is assumed to be 2. The number of rope wires is assumed to be 2. The weight of 50m wire is 18kg. Calculate the force due to acceleration.

(a)

1000N
(b)

309.144N
(c)

504.225N
(d)

102.225N
Answer:

Option (b)

32.

Small sheaves are preferred over large sheaves on what parameters?

(a)

Increasingly centrifugal force in large sheaves
(b)

Preferring centrifugal force reduction even for more money
(c)

The higher cost of small sheaves
(d)

It requires less space
Answer:

Option (a)

33.

Rope operating over steel sheaves wear slowly than those used in conjunction with cast iron sheaves.

(a)

True
(b)

False
Answer:

Option (b)

34.

Which type of rope drum is preferred?

(a)

Drums with helical grooves
(b)

Plain cylindrical drums
(c)

Both are equally preferred
(d)

None of the listed
Answer:

Option (a)

35.

If the nominal diameter of the rope is 20mm, then the pitch of the groove is around?

(a)

2mm
(b)

22mm
(c)

10mm
(d)

40mm
Answer:

Option (b)

36.

Effective stress in wire ropes during normal working is equal to the stress due to

(a)

axial load plus stress due to bending
(b)

acceleration/retardation of masses plus stress due to bending
(c)

axial load plus stress due to acceleration/retardation
(d)

bending plus stress due to acceleration/retardation
Answer:

Option (a)

Showing 31 to 36 out of 36 Questions
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