Tricky Machine Design Multiple choice Questions and Answers pdf

91.    Silver-based solder is used for
(a)    flaring
(b)    brazing
(c)    soft soldering
(d)    fusion welding
(e)    none of the above.'
Ans: b

92.    For tight leakage joints, following type of thread is best suited
(a) metric
(b) buttress
(c) square
(d) acme
(e) NPT (national pipe threads).
Ans: e

93.    In order to permit the thermal expansion/contraction of tubing, it should be
(a) crimped
(b) honed
(c) flared
(d) bent
(e) none of the above.
 Ans: d

94.    A tube has the following advantage over pipe
(a)    lighter and easier to handle
(b)    greater shock absorption
(c)    smoother inside walls
(d)    all of the above
(e)    none of the above.
Ans: d

95.    The strap end of a connecting rod of steam engine is joined by
(a)    big of cotter joint
(b)    sleeve and cotter joint
(c)    spigot socket cotter joint
(d)    knuckle joint
(e)    universal coupling.
Ans: a

96.    A backing ring is used inside the pipe joint when making a
(a) butt weld    
(b) fillet weld
(c) sleeve weld
(d) socket weld
(e) tube weld.
Ans: a

97.    The shear plane in case of bolts should
(a)    be across threaded portion of shank
(b)    be parallel to axis of bolt
(c)     be normal to threaded portion of shank
(d)    never be across the threaded portion
(e)    none of the above.
Ans: d

97.    Castle nut is a locking device in which
(a)    one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
(b)    a slot is cut partly is middle of nut and then slot reduced by tightening a screw
(c)    a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
(d)    through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin spitted and bent in reverse direction at other end
(e)    none of the above.
Ans: d

98.    When a nut is tightened by plapjng a washer below it, the bolt will be subjected to following type of loads
(a) compression
(b) tension
(c) shear     
(d) combined loads
(e) all of the above.
 Ans: b

99.    Gear box is used
(a)    to produce torque
(b)    for speed reduction
(c)    to obtain variable speeds
(d)    to increase efficiency of system
(e)    to damp out vibrations.
Ans: c

100.    The edges of the plates for cylindrical vessels are usually bevelled to an angle of 80° for
(a)    reducing stress concentration
(b)    ease of manufacture
(c)    safety
(d)    fullering and caulking
(e)    all of the above.
Ans: d

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