Question 1

Maximum shear stress in transverse fillet weld of leg h and length l is

Accepted Answer

A)  p/hl
B)  1.21p/hl
C)  p/1.21hl
D)  none of the listed B

Question 2

In hot riveting the shank portion is subjected to compressive stress.

Accepted Answer

A) True 
 B)False  False

Question 3

Determine the secondary shear stress acting on the bolt 3 and its direction. The bolts are equidistant having separated by 60mm and the margin to the left and right is 25mm.Also P=5kN acts at a distance of 200mm from the channel.

Accepted Answer

A)  6100n vertically up
B)  4500n vertically down.
C)  6100n vertically up.
D)  4500n vertically down C

Question 4

Which of the following isn't a main part of rivet?

Accepted Answer

A)  head
B)  shank
C)  point
D)  thread

Question 5

Woodruff key permits_______ movement b/w shaft and the hub.

Accepted Answer

A)  axial
B)  radial
C)  eccentric
D)  none of the listed

Question 6

A knuckle joint is also called socket pin joint.

Accepted Answer

A) True 
 B)False

Question 7

If allowable shear stress in the shaft is 70N/mm² and torsional and bending moments are M=1185000N-mm and m=330000N-mm, find the diameter of the shaft.

Accepted Answer

A)  36.8mm
B)  39.7mm
C)  44.7mm
D)  40.3mm

Question 8

Solid shaft is costlier than hollow shaft of same weight.

Accepted Answer

A) True 
 B)False

Question 9

Can the cotter joint be used to connect slide spindle and fork of valve mechanism?

Accepted Answer

A) True 
 B)False

Question 10

The stiffness of solid shaft is more than the stiffness of hollow shaft with same weight.

Accepted Answer

A) True 
 B)False

Question 11

Determine the length of kennedy key required to transmit 1200N-m and allowable shear in the key is 40N/mm². The diameter of shaft and width of key can be taken as 40mm and 10mm respectively.

Accepted Answer

A)  49mm
B)  36mm
C)  46mm
D)  53mm

Question 12

Determine the size of the bolts if yield strength of bolt is 400N/mm² and factor of safety is 4. The bolts are equidistant having separated by 60mm and the margin to the left and right is 25mm. Also P=5kN acts at a distance of 200mm from the channel.

Accepted Answer

A)  14.34mm
B)  13.44mm
C)  15.44mm
D)  12.66mm

Question 13

Knuckle Joint can't be used to connect two intersecting rods.

Accepted Answer

A)  yes
B)  no, it can't be used
C)  it can be used with some modificatios
D)  it is expensive and hence isn't used

Question 14

If knuckle joint is to fail by crushing failure of pin in fork, then determine the diameter of knuckle pin when 50kN axial tensile force act on rods. Given: Max allowable compressive stress=25N/mm², thickness of each eye of fork=25mm.

Accepted Answer

A)  40mm
B)  50mm
C)  60mm
D)  70mm

Question 15

Among gas and electric arc welding, which has the higher rate of heating?

Accepted Answer

A)  gas welding
B)  electric arc welding
C)  gas welding and electric arc welding have equal rate of heating
D)  cannot be determined

Question 16

Calculate the shaft diameter on rigidity basis if torsional moment is 196000N-mm, length of shaft is 1000mm. Permissible angle of twist per meter is 0.5' and take G=79300N/mm².

Accepted Answer

A)  none of the listed
B)  41.2mm
C)  35.8mm
D)  38.8mm

Question 17

A force 2P is acting on the double transverse fillet weld. Leg of weld is h and length l. Determine the shear stress in a plane inclined at ? with horizontal.

Accepted Answer

A)  psin?(sin?+cos?) /hl
B)  p(sin?+cos?) /hl
C)  pcos?(sin?+cos?) /hl
D)  none of the listed

Question 18

The main advantage of sunk key is that it is a_______ drive.

Accepted Answer

A)  positive
B)  negative
C)  neutral
D)  none of the listed

Question 19

Flexible shafts have_______rigidity in bending moment.

Accepted Answer

A)  high
B)  low
C)  very high
D)  extremely low

Question 20

Hollow saddle key is superior to flat saddle key as far as power transmitting capability is concerned.

Accepted Answer

A) True 
 B)False

Exam 7: Mechanical Engineering Shafts, Keys, and Joints

Maximum shear stress in transverse fillet weld of leg h and length l is

In hot riveting the shank portion is subjected to compressive stress.

Determine the secondary shear stress acting on the bolt 3 and its direction. The bolts are equidistant having separated by 60mm and the margin to the left and right is 25mm.Also P=5kN acts at a distance of 200mm from the channel.

Which of the following isn't a main part of rivet?

Woodruff key permits_______ movement b/w shaft and the hub.

A knuckle joint is also called socket pin joint.

If allowable shear stress in the shaft is 70N/mm² and torsional and bending moments are M=1185000N-mm and m=330000N-mm, find the diameter of the shaft.

Solid shaft is costlier than hollow shaft of same weight.

Can the cotter joint be used to connect slide spindle and fork of valve mechanism?

The stiffness of solid shaft is more than the stiffness of hollow shaft with same weight.

Determine the length of kennedy key required to transmit 1200N-m and allowable shear in the key is 40N/mm². The diameter of shaft and width of key can be taken as 40mm and 10mm respectively.

Determine the size of the bolts if yield strength of bolt is 400N/mm² and factor of safety is 4. The bolts are equidistant having separated by 60mm and the margin to the left and right is 25mm. Also P=5kN acts at a distance of 200mm from the channel.

Knuckle Joint can't be used to connect two intersecting rods.

If knuckle joint is to fail by crushing failure of pin in fork, then determine the diameter of knuckle pin when 50kN axial tensile force act on rods. Given: Max allowable compressive stress=25N/mm², thickness of each eye of fork=25mm.

Among gas and electric arc welding, which has the higher rate of heating?

Calculate the shaft diameter on rigidity basis if torsional moment is 196000N-mm, length of shaft is 1000mm. Permissible angle of twist per meter is 0.5' and take G=79300N/mm².

A force 2P is acting on the double transverse fillet weld. Leg of weld is h and length l. Determine the shear stress in a plane inclined at ? with horizontal.

The main advantage of sunk key is that it is a_______ drive.

Flexible shafts have_______rigidity in bending moment.

Hollow saddle key is superior to flat saddle key as far as power transmitting capability is concerned.