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Machine Design Quiz | Machine Design MCQs & Answers

Questions
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

Answer: nil or lightest
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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

Answer: 1 micron
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

Answer: ZN/p
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

Answer: double
89 Belt slip may occur due to
A heavy load
B loose belt
C driving pulley too small
D all of the above

Answer: 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

Answer: 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

Answer: cotter 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

Answer: tension
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

Answer: butt 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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