11) Select the odd one out
a) feather key
b) saddle key
c) woodruff key
d) gib head key
12)In Vicker’s hardness testing, the pyramid indentor apex is
(a) 40°
(b) 122°
(c) 136°
(d) 152°
(e) 161°.
13) The standard taper provided in taper key is
a) 1 : 20
b) 1 : 140
c) 1 : 100
d) 1 : 80
14) Which of the following key have self aligning property
a) Barth key
b) Kennedy key
c) Lewis key
d) Woodruff key
15) Which material is used for bushes in the bushed pin type of flexible coupling
a) Gun metal
b) Plastic
c) Rubber
d) Aluminium
16) A sleeve or muff coupling is designed as
a) solid shaft
b) hollow shaft
c) thick cylinder
d) strut
17) The crest diameter of a screw thread is same as
a) core diameter
b) root diameter
c) major diameter
d) minor diameter
18) If P is the pitch of a square thread, then the depth of thread d is given by
a) 0.5 P
b) P
c) 1.5 P
d) 2 P
19) The maximum efficiency of self locking screw is
a) 50%
b) 70%
c) 75%
d) 80%
20) According to IBR, the thickness of boiler shell is not to be less than
a) 5 mm
b) 7 mm
c) 10 mm
d) 12 mm