Machine Design MCQs

Option A: metric threads of 33 nos in 2 cm.

Option B: metric threads with cross-section of 33 mm

Option C: metric threads of 33 mm outside diameter and 2 mm pitch

Option D: bolt of 33 mm nominal diameter having 2 threads per cm

Correct Answer: metric threads of 33 mm outside diameter and 2 mm pitch ✔

Option A: thickness of plates to be riveted

Option B: length of rivet

Option C: diameter of head

Option D: nominal diameter

Correct Answer: nominal diameter ✔

Option A: bolts

Option B: keys

Option C: cotters

Option D: rivets

Correct Answer: rivets ✔

Option A: 0.2

Option B: 0.25

Option C: 0.50

Option D: 0.6

Correct Answer: 0.2 ✔

Option A: one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

Option B: a slot is cut partly in middle of nut and then slot reduced by tightening a screw

Option 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

Option D: through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter spitted and bent in reverse direction at other end

Correct Answer: one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming ✔

Option A: screw cutting lathes

Option B: feed mechanisms

Option C: spindles of bench vices

Option D: screw jack

Correct Answer: railway carriage couplings ✔

Option A: wood-ruff key

Option B: feather key

Option C: flat saddle key

Option D: gib head key

Correct Answer: wood-ruff key ✔

Option A: wood-ruff key

Option B: feather key

Option C: flat saddle key

Option D: gib head key

Correct Answer: flat saddle key ✔

Option A: right hand threads on bout ends

Option B: left hand threads on both ends

Option C: left hand threads on one end and right hand threads on other end

Option D: no threads

Correct Answer: left hand threads on one end and right hand threads on other end ✔

Option A: one small nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

Option B: a slot is cut partly in middle of nut and then slot reduced by tightening a screw

Option C: hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed on the bolt causing a tight grip

Option D: through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at other end

Correct Answer: hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed on the bolt causing a tight grip ✔

Option A: right hand with same pitch

Option B: left hand with same pitch

Option C: could be left or right hand

Option D: right hand with fine pitch

Correct Answer: left hand with same pitch ✔

Option A: metric

Option B: buttress

Option C: acme

Option D: square

Correct Answer: buttress ✔

Option A: metric

Option B: square

Option C: buttress

Option D: acme

Correct Answer: acme ✔

Option A: one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

Option B: a slot is cut partly in middle of nut and then slot reduced by tightening screw

Option 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

Option D: through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at the other end

Correct Answer: a slot is cut partly in middle of nut and then slot reduced by tightening screw ✔

Option A: provide cooling action

Option B: lubricate the dies

Option C: help remove chips

Option D: all of the above

Correct Answer: all of the above ✔

Option A: metric

Option B: buttress

Option C: square

Option D: acme

Correct Answer: NPT (national pipe threads) ✔

Option A: lighter and easier to handle

Option B: greater shock absorption

Option C: smoother inside walls

Option D: all of the above

Correct Answer: all of the above ✔

Option A: butt weld

Option B: fillet weld

Option C: sleeve weld

Option D: socket weld

Correct Answer: butt weld ✔

Option A: one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

Option B: a slot is cut partly is middle of nut and then slot reduced by tightening a screw

Option 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

Option 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

Correct 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 ✔

Option A: to produce torque

Option B: for speed reduction

Option C: to obtain variable speeds

Option D: to increase efficiency of system

Correct Answer: to obtain variable speeds ✔

Option A: bolted joint

Option B: kunckle joint

Option C: cotter joint

Option D: universal joint

Correct Answer: cotter joint ✔

Option A: ratio of coil diameter to wire diameter

Option B: load required to produce unit deflection

Option C: its capability of storing energy

Option D: indication of quality of spring

Correct Answer: ratio of coil diameter to wire diameter ✔

Option A: ratio of coil diameter to wire diameter

Option B: load required to produce unit deflection

Option C: its capability of storing energy

Option D: concerned With strength of wire of spring

Correct Answer: its capability of storing energy ✔

Option A: K

Option B: K/2

Option C: 2K

Option D: KIA

Correct Answer: K ✔

Option A: half

Option B: same

Option C: double

Option D: unpredictable

Correct Answer: double ✔

Option A: welding

Option B: precasting

Option C: rivetting

Option D: casting

Correct Answer: rivetting ✔

Option A: the oil film pressure is generated only by the rotation of the journal

Option B: the oil film is maintained by supplying oil under pressure

Option C: do not require external supply of lubricant

Option D: grease is used for lubrication

Correct Answer: the oil film pressure is generated only by the rotation of the journal ✔

Option A: ZN/p

Option B: p/ZN

Option C: Z/pN

Option D: N/Zp

Correct Answer: ZN/p ✔

Option A: the Oil film pressure is generated only by the rotation of the journal

Option B: the oil film is maintained by supplying oil under pressure

Option C: do not require external supply of lubricant

Option D: grease is used for lubrication

Correct Answer: the oil film is maintained by supplying oil under pressure ✔

Option A: directly as load

Option B: inversely as square of load

Option C: inversely as cube of load

Option D: inversely as fourth power of load

Correct Answer: inversely as cube of load ✔

Option A: at bottom

Option B: at sides only

Option C: both at bottom and sides

Option D: could touch anywhere

Correct Answer: at sides only ✔

Option A: direction of twist of wires in strands is opposite to the direction of twist of strands

Option B: direction of twist of wires and strands are same

Option C: wires in two adjacent strands are twisted in opposite direction

Option D: wires are not twisted

Correct Answer: direction of twist of wires in strands is opposite to the direction of twist of strands ✔

Option A: diameter of bolt

Option B: 0.75 x diameter of bolt

Option C: 1.25 x diameter of bolt

Option D: 1.5 x diameter of bolt

Correct Answer: diameter of bolt ✔

Option A: whose upper deviation is zero

Option B: whose lower deviation is zero

Option C: whose lower as well as upper deviations are zero

Option D: does not exist

Correct Answer: whose lower deviation is zero ✔

Option A: 0.4 times

Option B: 0.6 times

Option C: 0.7 times

Option D: 0.8 times

Correct Answer: 0.4 times ✔

Option A: initial tension

Option B: external load applied

Option C: relative elastic yielding (springness) of the bolt and the connected member

Option D: A. and B. above

Correct Answer: E. A, B. and C. above ✔

Option A: shank

Option B: head

Option C: in the middle

Option D: at the thread

Correct Answer: at the thread ✔

Option A: joint may not open up

Option B: bolts are weakest elements

Option C: the resultant load on the bolt would not be affected by the external cyclic load

Option D: bolts will not loosen during service

Correct Answer: the resultant load on the bolt would not be affected by the external cyclic load ✔

Option A: tightening it properly

Option B: increasing shank diameter

Option C: grinding the shank

Option D: using washer

Correct Answer: making shank diameter equal to core diameter of thread ✔

Option A: square

Option B: acme

Option C: buttress

Option D: BSW

Correct Answer: buttress ✔

Option A: is just sufficient to hold parts together

Option B: approaches yield point

Option C: is 50% of yield point

Option D: is about yield point divided by safety factor

Correct Answer: approaches yield point ✔

Option A: self locking bolts

Option B: designed for shock load

Option C: used in aircraft application

Option D: provided with hexagonal depression in head

Correct Answer: provided with hexagonal depression in head ✔

Option A: 18

Option B: 16

Option C: 20

Option D: 22

Correct Answer: 18 ✔

Option A: direction of twist of wires in strands is opposite to the direction of twist of strands

Option B: direction of twist of wires and strands are same

Option C: wires in two adjacent strands are twisted in opposite direction

Option D: wires are not twisted

Correct Answer: wires in two adjacent strands are twisted in opposite direction ✔

Option A: whose upper deviation is zero

Option B: whose lower deviation is zero

Option C: whose lower as well as upper deviations are zero

Option D: does not exist

Correct Answer: whose upper deviation is zero ✔

Option A: yes

Option B: no

Option C: sometimes

Option D: rarely

Correct Answer: yes ✔

Option A: 5°

Option B: 8°

Option C: 15°

Option D: 25°

Correct Answer: 5° ✔

Option A: same time to reach earth

Option B: times proportional to weight to reach earth

Option C: times inversely proportional to weight to reach earth

Option D: unpredictable

Correct Answer: same time to reach earth ✔

Option A: the oil film pressure is generated only by the rotation of the journal

Option B: the oil film is maintained by supplying oil under pressure

Option C: do not require external supply of lubricant

Option D: grease required to be applied after some intervals

Correct Answer: do not require external supply of lubricant ✔

Option A: nil or lightest

Option B: maximum

Option C: average

Option D: any one of the above

Correct Answer: nil or lightest ✔

Option A: 0.01 micron

Option B: 0.1 micron

Option C: 1 micron

Option D: 10 microns

Correct Answer: 1 micron ✔

Option A: sleeve bearings

Option B: hydrodynamic bearings

Option C: thin lubricated bearings

Option D: ball and roller bearings

Correct Answer: none of the above ✔

Option A: half

Option B: same

Option C: double

Option D: unpredictable

Correct Answer: double ✔

Option A: heavy load

Option B: loose belt

Option C: driving pulley too small

Option D: all of the above

Correct Answer: all of the above ✔

Option A: tension

Option B: shear

Option C: compression

Option D: all of the above

Correct Answer: tension ✔

Option A: ratio of coil diameter to wire diameter

Option B: load required to produce unit deflection

Option C: its capability of storing energy

Option D: its ability to absorb shocks

Correct Answer: load required to produce unit deflection ✔

Option A: larger

Option B: smaller

Option C: equal

Option D: larger/smaller depending on diameter of spring coil

Correct Answer: larger ✔

Option A: flanged

Option B: threaded

Option C: bell and spigot

Option D: expansion

Correct Answer: expansion ✔

Option A: reducing stress concentration

Option B: ease of manufacture

Option C: safety

Option D: fullering and caulking

Correct Answer: fullering and caulking ✔

Option A: compression

Option B: tension

Option C: shear

Option D: combined loads

Correct Answer: tension ✔

Option A: be across threaded portion of shank

Option B: be parallel to axis of bolt

Option C: be normal to threaded portion of shank

Option D: never be across the threaded portion

Correct Answer: never be across the threaded portion ✔

Option A: gib of cotter joint

Option B: sleeve and cotter joint

Option C: spigot socket cotter joint

Option D: knuckle joint

Correct Answer: gib of cotter joint ✔

Option A: crimped

Option B: honed

Option C: flared

Option D: bent

Correct Answer: bent ✔

Option A: flaring

Option B: brazing

Option C: soft soldering

Option D: fusion welding

Correct Answer: brazing ✔

Option A: on both the sides

Option B: on one side only

Option C: on none of the sides

Option D: may be provided anywhere

Correct Answer: on one side only ✔

Option A: cotter joint

Option B: bolted joint

Option C: kunckle joint

Option D: universal coupling

Correct Answer: kunckle joint ✔

Option A: 3 mm

Option B: 5 mm

Option C: 10 mm

Option D: 20 mm

Correct Answer: 3 mm ✔

Option A: 1 in 5

Option B: 1 in 10

Option C: 1 in 24

Option D: 1 in 40

Correct Answer: 1 in 24 ✔

Option A: 102 d

Option B: 124 d

Option C: 138 d

Option D: 151 d

Correct Answer: 168 d ✔

Option A: foundation purposes

Option B: locking devices *

Option C: absorbing shock and vibrations

Option D: transmission of power

Correct Answer: lifting and transportation of machines and cubicles ✔

Option A: ductile material

Option B: brittle material

Option C: elastic material

Option D: hard material

Correct Answer: ductile material ✔

Option A: wood-ruff key

Option B: feather key

Option C: flat saddle key

Option D: gib head key

Correct Answer: wood-ruff key ✔

Option A: increase shank diameter

Option B: increase its length

Option C: drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread

Option D: tighten die bolt properly

Correct Answer: drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread ✔

Option A: same

Option B: coarser

Option C: finer

Option D: very coarse

Correct Answer: same ✔

Option A: tensile strength

Option B: compressive strength

Option C: shear strength

Option D: bending strength

Correct Answer: tensile strength ✔

Option A: d

Option B: 1.25 d

Option C: 1.5 d

Option D: 1.75 d

Correct Answer: d ✔

Option A: 30°

Option B: 45°

Option C: 60°

Option D: 80°

Correct Answer: 80° ✔

Option A: similar to small size tap bolts except that a greater variety of shapes of heads are available

Option B: slotted for a screw driver and generally used with a nut

Option C: used to prevent relative motion be-tween two parts

Option D: similar to stud

Correct Answer: slotted for a screw driver and generally used with a nut ✔

Option A: fine threads

Option B: coarse threads

Option C: coefficient of friction > tangent of load angle

Option D: hole for inserting split pin

Correct Answer: coefficient of friction > tangent of load angle ✔

Option A: a member made of steel will generally be more rigid than a member of equal load-carrying ability made of cast iron

Option B: a member made of cast iron will generally be. more rigid than a member of equal load carrying ability made of steel

Option C: both will be equally rigid

Option D: which one is rigid will depend on several other factors

Correct Answer: a member made of cast iron will generally be. more rigid than a member of equal load carrying ability made of steel ✔

Option A: 0.25

Option B: 0.45

Option C: 0.55

Option D: 0.65

Correct Answer: 0.75 ✔

Option A: has a head on one end and a nut fitted to the other

Option B: has head at one end and other end fits into a tapped hole in the other part to be joined

Option C: has both the ends threaded

Option D: is provided with pointed threads

Correct Answer: has a head on one end and a nut fitted to the other ✔

Option A: lOVZ

Option B: 10VZtol5Vd

Option C: 15Vdto20VZ

Option D: 20Vdto30Vd

Correct Answer: 20Vdto30Vd ✔

Option A: alien nut

Option B: hexagonal nut

Option C: slotted nut

Option D: castle nut

Correct Answer: any one of the above ✔

Option A: ductile fnaterials

Option B: brittle materials

Option C: elastic materials

Option D: all of the above

Correct Answer: ductile fnaterials ✔

Option A: ISO metric thread

Option B: acme thread

Option C: square thread

Option D: buttress thread

Correct Answer: buttress thread ✔

Option A: provide cushioning effect

Option B: provide bearing area

Option C: absorb shocks and vibrations

Option D: provide smooth surface in place of rough surface

Correct Answer: provide bearing area ✔

Option A: screw jack

Option B: aeroplane engines

Option C: crane

Option D: steering mechanism

Correct Answer: steering mechanism ✔

Option A: self locking bolt

Option B: same as stud

Option C: provided with hexagonal depression in head

Option D: used in high speed components

Correct Answer: provided with hexagonal depression in head ✔

Option A: similar to small size tap bolts except that a greater variety of shapes of heads are available

Option B: slotted for a screw driver and generally used with a nut

Option C: used to prevent relative motion be-tween parts

Option D: similar to stud

Correct Answer: used to prevent relative motion be-tween parts ✔

Option A: 28

Option B: 8/2

Option C: 48

Option D: 8/4

Correct Answer: 48 ✔

Option A: similar to’small size tap bolts except that a greater variety of shapes of heads are available

Option B: slotted for a screw driver and generally used with a nut

Option C: used to prevent relative motion be-tween parts

Option D: provided with detachable caps

Correct Answer: similar to’small size tap bolts except that a greater variety of shapes of heads are available ✔

Option A: 60°

Option B: 55°

Option C: 47°

Option D: 29°

Correct Answer: 60° ✔

Option A: has a head on one end and a nut fitted to the other

Option B: has head at one end and other end fits into a tapped hole in the other part o be joined

Option C: has both the ends threaded

Option D: has pointed threads

Correct Answer: has head at one end and other end fits into a tapped hole in the other part o be joined ✔

Option A: has a head on one end and a nut fitted to the other

Option B: has head at one end and other end fits into a tapped hole in the other part to be joined

Option C: has both the ends threaded

Option D: has pointed threads

Correct Answer: has both the ends threaded ✔

Option A: ductile materials

Option B: brittle materials

Option C: elastic materials

Option D: all of the above

Correct Answer: brittle materials ✔

Option A: major diameter

Option B: minor diameter

Option C: pitch diameter

Option D: core diameter

Correct Answer: major diameter ✔

Option A: increases markedly

Option B: decreases markedly

Option C: remains same

Option D: depends on heat treatment carried out

Correct Answer: decreases markedly ✔

Option A: same

Option B: 1/2

Option C: 1/3

Option D: 1/4

Correct Answer: 2/3 ✔

Option A: Young’s modulus

Option B: coefficient of elasticity

Option C: elastic limit

Option D: ultimate tensile strength

Correct Answer: endurance limit ✔