Woodruff key

Feather key

Flat saddle key

Gib head key

A. Woodruff key

Material and geometry of the part

Geometry of the part

Material of the part

None of these

Shear strength is equal to crushing strength

Shear strength is greater than crushing strength

Shear strength is less than crushing strength

None of the above

To produce torque

For speed reduction

To obtain variable speeds

To increase efficiency of system

(Sum of base circle radii)/cosφ

(Difference of base circle radii)/cosφ

(Sum of pitch circle radii)/cosφ

(Difference of pitch circle radii)/cosφ

Regain its original shape after deformation when the external forces are removed

Draw into wires by the application of a tensile force

Resist fracture due to high impact loads

Retain deformation produced under load permanently

1 in 24 to 1 in 20

1 in 15 to 1 in 10

1 in 32 to 1 in 24

1 in 48 to 1 in 24

Reducing

Increasing

Both A and B

None of these

124 d

138 d

151 d

168 d

Static load

Dynamic load

Impact load

Completely reversed load

Decreasing the cross-section area of bar

Increasing the cross-section area of bar

Remain unaffected with cross-section area

Would depend upon other factors

7.5 kN

10.6 kN

15 kN

22.5 kN

Self locking bolts

Designed for shock load

Used in aircraft application

Provided with hexagonal depression in head

1

1/π

π

π × number of teeth

Screw jack

Aeroplane engines

Crane

Steering mechanism

Pitch circle to the top of a tooth

Pitch circle to the bottom of a tooth

Top of a tooth to the bottom of a tooth

Addendum circle to the clearance circle

Helical spring

Conical spring

Flat spiral spring

Volute spring

Half

Same

Double

None of the above

Bending stress

Shear stress

Tensile stress

Bearing stress

4430 mm as diameter of small pulley

4430 mm as nominal pitch length

4430 mm as diameter of large pulley

4430 mm as centre distance between pulleys

Initial tension

External load applied

Sum of the initial tension and external load applied

Initial tension or external load, whichever is greater

0.5 times

Equal to

2 times

Double

50°C above upper critical temperature

50°C below upper critical temperature

50°C above lower critical temperature

50°C below lower critical temperature

Increases

Decreases

Remain same

None of these

Metric

Buttress

Square

NPT (national pipe threads)

Flanged

Threaded

Bell and spigot

Expansion

Bolt

Tap bolt

Stud

None of these

Nickel

Chromium

Nickel and chromium

Cobalt and molybdenum

Constant period

Fixed period

Dwell period

Idle period

Dynamic loading

Static loading

Combined static and dynamic loading

Completely reversed loading

F + P

F P

P

F