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Free download in PDF Machine Design MCQs & Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
81
The rated life of a bearing varies
[A]
directly as load
[B]
inversely as square of load
[C]
inversely as cube of load
[D]
inversely as fourth power of load
Answer: inversely as cube of load
82
Oil in journal bearing should be applied at the point where load is
[A]
nil or lightest
[B]
maximum
[C]
average
[D]
any one of the above
83
In hydrostatic bearings
[A]
the Oil film pressure is generated only by the rotation of the journal
[B]
the oil film is maintained by supplying oil under pressure
[C]
do not require external supply of lubricant
[D]
grease is used for lubrication
Answer: the oil film is maintained by supplying oil under pressure
84
The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is
[A]
0.01 micron
[B]
0.1 micron
[C]
1 micron
[D]
10 microns
85
If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by
[A]
ZN/p
[B]
p/ZN
[C]
Z/pN
[D]
N/Zp
86
Antifriction bearings are
[A]
ball and roller bearings
[B]
thin lubricated bearings
[C]
sleeve bearings
[D]
none of the above
Answer: none of the above
87
In hydrodynamic bearings
[A]
the oil film pressure is generated only by the rotation of the journal
[B]
the oil film is maintained by supplying oil under pressure
[C]
do not require external supply of lubricant
[D]
grease is used for lubrication
Answer: the oil film pressure is generated only by the rotation of the journal
88
If two springs are in parallel then their overall stiffness will be
[A]
half
[B]
same
[C]
double
[D]
unpredictable
89
Belt slip may occur due to
[A]
heavy load
[B]
loose belt
[C]
driving pulley too small
[D]
all of the above
90
Spring stiffness is
[A]
ratio of coil diameter to wire diameter
[B]
load required to produce unit deflection
[C]
its capability of storing energy
[D]
its ability to absorb shocks
Answer: load required to produce unit deflection
91
Form coefficient of spring is
[A]
ratio of coil diameter to wire diameter
[B]
load required to produce unit deflection
[C]
its capability of storing energy
[D]
concerned With strength of wire of spring
Answer: its capability of storing energy
92
Spring index is
[A]
ratio of coil diameter to wire diameter
[B]
load required to produce unit deflection
[C]
its capability of storing energy
[D]
indication of quality of spring
Answer: ratio of coil diameter to wire diameter
93
Which of the following pipe joints would be suitable for pipes carrying steam
[A]
flanged
[B]
threaded
[C]
bell and spigot
[D]
expansion
94
The piston rod of a steam engine is usually connected to the crosshead by means of
[A]
bolted joint
[B]
cotter joint
[C]
universal joint
[D]
kunckle joint
95
Gear box is used
[A]
to produce torque
[B]
for speed reduction
[C]
to obtain variable speeds
[D]
to increase efficiency of system
Answer: to obtain variable speeds
96
When a nut is tightened by plaping a washer below it, the bolt will be subjected to following type of loads
[A]
compression
[B]
tension
[C]
shear
[D]
combined loads
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
Answer: 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
98
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
Answer: never be across the threaded portion
99
A backing ring is used inside the pipe joint when making a
[A]
butt weld
[B]
fillet weld
[C]
sleeve weld
[D]
socket weld
100
The strap end of a connecting rod of steam engine is joined by
[A]
gib of cotter joint
[B]
sleeve and cotter joint
[C]
spigot socket cotter joint
[D]
knuckle joint
Answer: gib of cotter joint
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