1003 + Mcqs in Machine Design Page 11 McqOptions

501.	/_In order to obtain bolt of uniform strength?
A.	Increase shank diameter
B.	Increase its length
C.	Drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread
D.	Tighten die bolt properly
Answer» D. Tighten die bolt properly

Discussion

502.	/_A double fillet welded joint with parallel fillet weld of length 'l' and leg 's' is subjected to a tensile force 'P'. Assuming uniform stress distribution, the shear stress in the weld is given by?
A.	‚Äö√ √∂2P/s.l
B.	P/2.s.l
C.	P/‚Äö√ √∂2.s.l
D.	2P/s.l
Answer» D. 2P/s.l

Discussion

503.	/_Soderberg relation is based on __________ of the material whereas all other failure relation for dynamic loading are based on ultimate strength of the material.?
A.	Elastic strength
B.	Yield strength
C.	Shear strength
D.	None of these
Answer» C. Shear strength

Discussion

504.	/_When the fulcrum is in between the load and effort, the lever is said to be of?
A.	First type
B.	Second type
C.	Third type
D.	Any one of these
Answer» B. Second type

Discussion

505.	/_The pipe joint mostly used for pipes carrying water at low pressures is?
A.	Socket joint
B.	Nipple joint
C.	Union joint
D.	Spigot and socket joint
Answer» B. Nipple joint

Discussion

506.	/_According to I.B.R., the distance between the rows of rivets, for equal number of rivets in more than one row for lap joint or butt joint (chain riveting) shall not be less than?
A.	d
B.	1.5 d
C.	2 d
D.	2.5 d
Answer» D. 2.5 d

Discussion

507.	/_The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils)?
A.	Gd‚Äö√Ö¬•/ 8D3n
B.	Gd3/ 8D3n
C.	Gd‚Äö√Ö¬•/ 4D3n
D.	Gd‚Äö√Ö¬•/ 8D¬¨‚â§n
Answer» B. Gd3/ 8D3n

Discussion

508.	/_Transverse fillet welded joints are designed for?
A.	Tensile strength
B.	Compressive strength
C.	Shear strength
D.	Bending strength
Answer» B. Compressive strength

Discussion

509.	/_The yield point in static loading is __________ as compared to fatigue loading.?
A.	Higher
B.	Lower
C.	Same
D.	None of these
Answer» B. Lower

Discussion

510.	/_The root angle of a bevel gear is equal to?
A.	Pitch angle - addendum angle
B.	Pitch angle + addendum angle
C.	Pitch angle - dedendum angle
D.	Pitch angle + dedendum angle
Answer» D. Pitch angle + dedendum angle

Discussion

511.	/_When the shaft rotates in anticlockwise direction at high speed in a bearing, it will?
A.	Have contact at the bottom most of the bearing
B.	Move towards right of the bearing making metal to metal contact
C.	Move towards right of the bearing making no metal to metal contact
D.	Move towards left of the bearing making metal to metal contact
Answer» D. Move towards left of the bearing making metal to metal contact

Discussion

512.	/_A thin spherical shell of internal diameter d is subjected to an internal pressure p. If V is the storage capacity of shell, then its diameter will be?
A.	(6V/ ≈ì√Ñ)1/2
B.	(6V/ ≈ì√Ñ)1/3
C.	(6V/ ≈ì√Ñ)2
D.	(6V/ ≈ì√Ñ)3
Answer» C. (6V/ ≈ì√Ñ)2

Discussion

513.	/_The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is?
A.	Larger
B.	Smaller
C.	Equal
D.	Larger/smaller depending on diameter of spring coil
Answer» B. Smaller

Discussion

514.	/_The suitable material for belt used in flour mill is?
A.	Leather
B.	Rubber
C.	Canvas or cotton duck
D.	Balata gum
Answer» D. Balata gum

Discussion

515.	/_For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately?
A.	0.4 times
B.	0.6 times
C.	0.7 times
D.	0.8 times
Answer» B. 0.6 times

Discussion

516.	%_In worm, gears, pitch lead angle is_%
A.	Half the angle between two inclined faces in axial plane
B.	The angle between the tangent to the pitch helix and the plane of rotation
C.	The angle between the tangent to the pitch helix and an element of the cylinder
D.	None of the above
Answer» C. The angle between the tangent to the pitch helix and an element of the cylinder

Discussion

517.	%_Resilience of a material is important, when it is subjected to_%
A.	Combined loading
B.	Fatigue
C.	Thermal stresses
D.	Shock loading
Answer» E.

Discussion

518.	%_When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at the_%
A.	Thread
B.	Middle
C.	Shank
D.	Head
Answer» B. Middle

Discussion

519.	%_In a journal bearing, the load on the bearing is __________ to the axis of the journal._%
A.	Parallel
B.	Perpendicular
C.	Both A and B
D.	None of these
Answer» C. Both A and B

Discussion

520.	%_In designing a sleeve coupling, length of the sleeve is taken as (where d = Diameter of the shaft)_%
A.	d + 17 mm
B.	2d + 13 mm
C.	2d + 20 mm
D.	3.5 d
Answer» E.

Discussion

521.	%_The static tooth load should be __________ the dynamic load._%
A.	Equal to
B.	Less than
C.	Greater than
D.	None of these
Answer» D. None of these

Discussion

522.	%_The permissible stress in the fillet weld is 100 N/mm¬¨‚â§. The fillet weld has equal leg lengths of 15 mm each. The allowable shearing load on the weldment per cm length of the weld is_%
A.	7.5 kN
B.	10.6 kN
C.	15 kN
D.	22.5 kN
Answer» C. 15 kN

Discussion

523.	%_In order to have a connecting rod equally strong in buckling about X-axis and Y-axis, the moment of inertia about X-axis should be __________ the moment of inertia about Y-axis._%
A.	Equal to
B.	Twice
C.	Three times
D.	Four times
Answer» E.

Discussion

524.	%_The effective stress in wire ropes during normal working is equal to the stress due to_%
A.	Axial load plus stress due to bending
B.	Acceleration/retardation of masses plus stress due to bending
C.	Axial load plus stress due to acceleration/retardation
D.	Bending plus stress due to acceleration/retardation
Answer» B. Acceleration/retardation of masses plus stress due to bending

Discussion

525.	%_When two springs are in series (having stiffness K), the equivalent stiffness will be_%
A.	K
B.	K/2
C.	2K
D.	K/4
Answer» C. 2K

Discussion

526.	%_Screws used for power transmission should have_%
A.	Very fine threads
B.	High efficiency
C.	Low efficiency
D.	Strong teeth
Answer» C. Low efficiency

Discussion

527.	%_In order to have smooth operation, the minimum number of teeth on the smaller sprocket, for moderate speeds, should be_%
A.	15
B.	17
C.	21
D.	25
Answer» C. 21

Discussion

528.	%_A key capable of tilting in a recess milled out in a shaft is known as_%
A.	Woodruff key
B.	Feather key
C.	Flat saddle key
D.	Hollow saddle key
Answer» B. Feather key

Discussion

529.	%_The suitable material for belt used in flour mill is_%
A.	Leather
B.	Rubber
C.	Canvas or cotton duck
D.	Balata gum
Answer» D. Balata gum

Discussion

530.	%_For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately_%
A.	0.4 times
B.	0.6 times
C.	0.7 times
D.	0.8 times
Answer» B. 0.6 times

Discussion

531.	%_The yield point in static loading is __________ as compared to fatigue loading._%
A.	Higher
B.	Lower
C.	Same
D.	None of these
Answer» B. Lower

Discussion

532.	%_The root angle of a bevel gear is equal to_%
A.	Pitch angle - addendum angle
B.	Pitch angle + addendum angle
C.	Pitch angle - dedendum angle
D.	Pitch angle + dedendum angle
Answer» D. Pitch angle + dedendum angle

Discussion

533.	%_The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is_%
A.	Larger
B.	Smaller
C.	Equal
D.	Larger/smaller depending on diameter of spring coil
Answer» B. Smaller

Discussion

534.	%_A thin spherical shell of internal diameter d is subjected to an internal pressure p. If V is the storage capacity of shell, then its diameter will be_%
A.	(6V/ ≈ì√Ñ)1/2
B.	(6V/ ≈ì√Ñ)1/3
C.	(6V/ ≈ì√Ñ)2
D.	(6V/ ≈ì√Ñ)3
Answer» C. (6V/ ≈ì√Ñ)2

Discussion

535.	%_Transverse fillet welded joints are designed for_%
A.	Tensile strength
B.	Compressive strength
C.	Shear strength
D.	Bending strength
Answer» B. Compressive strength

Discussion

536.	%_Which of the following key is preferred for the condition when a large amount of impact type torque is to be transmitted in both direction of rotation?_%
A.	Woodruff key
B.	Feather key
C.	Gib-head key
D.	Tangent key
Answer» E.

Discussion

537.	%_The wire ropes make contact at_%
A.	Bottom of groove of the pulley
B.	Sides and bottom of groove of the pulley
C.	Anywhere in the groove of the pulley
D.	Sides of groove of the pulley
Answer» B. Sides and bottom of groove of the pulley

Discussion

538.	%_The centre to centre distance between two consecutive rivets in a row, is called_%
A.	Margin
B.	Pitch
C.	Back pitch
D.	Diagonal pitch
Answer» C. Back pitch

Discussion

539.	%_Allen bolts are_%
A.	Self locking bolts
B.	Designed for shock load
C.	Used in aircraft application
D.	Provided with hexagonal depression in head
Answer» E.

Discussion

540.	%_In standard taper roller bearings, the angle of taper of outer raceway is_%
A.	5¬¨‚àû
B.	8¬¨‚àû
C.	15¬¨‚àû
D.	25¬¨‚àû
Answer» E.

Discussion

541.	%_For steel, the ultimate strength in shear as compared to ultimate strength in tension is_%
A.	1/2
B.	1/3
C.	1/4
D.	2/3
Answer» E.

Discussion

542.	%_The allowable static stress for steel gears is approximately __________ of the ultimate tensile stress._%
A.	One-fourth
B.	One-third
C.	One-half
D.	Double
Answer» C. One-half

Discussion

543.	%_The function of a washer is to_%
A.	Provide cushioning effect
B.	Provide bearing area
C.	Absorb shocks and vibrations
D.	Provide smooth surface in place of rough surface
Answer» C. Absorb shocks and vibrations

Discussion

544.	%_When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant load on the bolt will be equal to the_%
A.	Initial tension
B.	External load applied
C.	Sum of the initial tension and external load applied
D.	Initial tension or external load, whichever is greater
Answer» D. Initial tension or external load, whichever is greater

Discussion

545.	%_Jam 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 in middle of nut and then slot reduced by tightening a screw
C.	A hard fibre 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 spitted and bent in reverse direction at other end
Answer» B. A slot is cut partly in middle of nut and then slot reduced by tightening a screw

Discussion

546.	%_Gear box is used_%
A.	To produce torque
B.	For speed reduction
C.	To obtain variable speeds
D.	To increase efficiency of system
Answer» D. To increase efficiency of system

Discussion

547.	_ In the levers of third type, the mechanical advantage is __________ one.$?
A.	Less than
B.	Equal to
C.	More than
D.	None of these
Answer» B. Equal to

Discussion

548.	_ A fast and loose pulley drive is used when$?
A.	Shafts are arranged parallel and rotate in the opposite directions
B.	Shafts are arranged parallel and rotate in the same directions
C.	Shafts are arranged at right angles and rotate in one definite direction
D.	Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
Answer» E.

Discussion

549.	_ The bearing characteristic number in a hydrodynamic bearing depends upon$?
A.	Length, width and load
B.	Length, width and speed
C.	Viscosity, speed and load
D.	Viscosity, speed and bearing pressure
Answer» E.

Discussion

550.	_ A sliding bearing which operates without any lubricant present, is called$?
A.	Zero film bearing
B.	Boundary lubricated bearing
C.	Hydrodynamic lubricated bearing
D.	Hydrostatic lubricated bearing
Answer» B. Boundary lubricated bearing

Discussion

Explore topic-wise MCQs in Mechanical Engineering.

*/*_In order to obtain bolt of uniform strength?

*/*_A double fillet welded joint with parallel fillet weld of length 'l' and leg 's' is subjected to a tensile force 'P'. Assuming uniform stress distribution, the shear stress in the weld is given by?

*/*_Soderberg relation is based on __________ of the material whereas all other failure relation for dynamic loading are based on ultimate strength of the material.?

*/*_When the fulcrum is in between the load and effort, the lever is said to be of?

*/*_The pipe joint mostly used for pipes carrying water at low pressures is?

*/*_According to I.B.R., the distance between the rows of rivets, for equal number of rivets in more than one row for lap joint or butt joint (chain riveting) shall not be less than?

*/*_The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils)?

*/*_Transverse fillet welded joints are designed for?

*/*_The yield point in static loading is __________ as compared to fatigue loading.?

*/*_The root angle of a bevel gear is equal to?

*/*_When the shaft rotates in anticlockwise direction at high speed in a bearing, it will?

*/*_A thin spherical shell of internal diameter d is subjected to an internal pressure p. If V is the storage capacity of shell, then its diameter will be?

*/*_The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is?

*/*_The suitable material for belt used in flour mill is?

*/*_For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately?

%_In worm, gears, pitch lead angle is_%

%_Resilience of a material is important, when it is subjected to_%

%_When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at the_%

%_In a journal bearing, the load on the bearing is __________ to the axis of the journal._%

%_In designing a sleeve coupling, length of the sleeve is taken as (where d = Diameter of the shaft)_%

%_The static tooth load should be __________ the dynamic load._%

%_The permissible stress in the fillet weld is 100 N/mm¬¨‚â§. The fillet weld has equal leg lengths of 15 mm each. The allowable shearing load on the weldment per cm length of the weld is_%

%_In order to have a connecting rod equally strong in buckling about X-axis and Y-axis, the moment of inertia about X-axis should be __________ the moment of inertia about Y-axis._%

%_The effective stress in wire ropes during normal working is equal to the stress due to_%

%_When two springs are in series (having stiffness K), the equivalent stiffness will be_%

%_Screws used for power transmission should have_%

%_In order to have smooth operation, the minimum number of teeth on the smaller sprocket, for moderate speeds, should be_%

%_A key capable of tilting in a recess milled out in a shaft is known as_%

%_The suitable material for belt used in flour mill is_%

%_For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately_%

%_The yield point in static loading is __________ as compared to fatigue loading._%

%_The root angle of a bevel gear is equal to_%

%_The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is_%

%_A thin spherical shell of internal diameter d is subjected to an internal pressure p. If V is the storage capacity of shell, then its diameter will be_%

%_Transverse fillet welded joints are designed for_%

%_Which of the following key is preferred for the condition when a large amount of impact type torque is to be transmitted in both direction of rotation?_%

%_The wire ropes make contact at_%

%_The centre to centre distance between two consecutive rivets in a row, is called_%

%_Allen bolts are_%

%_In standard taper roller bearings, the angle of taper of outer raceway is_%

%_For steel, the ultimate strength in shear as compared to ultimate strength in tension is_%

%_The allowable static stress for steel gears is approximately __________ of the ultimate tensile stress._%

%_The function of a washer is to_%

%_When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant load on the bolt will be equal to the_%

%_Jam nut is a locking device in which_%

%_Gear box is used_%

_ In the levers of third type, the mechanical advantage is __________ one.$?

_ A fast and loose pulley drive is used when$?

_ The bearing characteristic number in a hydrodynamic bearing depends upon$?

_ A sliding bearing which operates without any lubricant present, is called$?

/_In order to obtain bolt of uniform strength?

/_A double fillet welded joint with parallel fillet weld of length 'l' and leg 's' is subjected to a tensile force 'P'. Assuming uniform stress distribution, the shear stress in the weld is given by?

/_Soderberg relation is based on __________ of the material whereas all other failure relation for dynamic loading are based on ultimate strength of the material.?

/_When the fulcrum is in between the load and effort, the lever is said to be of?

/_The pipe joint mostly used for pipes carrying water at low pressures is?

/_According to I.B.R., the distance between the rows of rivets, for equal number of rivets in more than one row for lap joint or butt joint (chain riveting) shall not be less than?

/_The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils)?

/_Transverse fillet welded joints are designed for?

/_The yield point in static loading is __________ as compared to fatigue loading.?

/_The root angle of a bevel gear is equal to?

/_When the shaft rotates in anticlockwise direction at high speed in a bearing, it will?

/_A thin spherical shell of internal diameter d is subjected to an internal pressure p. If V is the storage capacity of shell, then its diameter will be?

/_The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is?

/_The suitable material for belt used in flour mill is?

/_For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately?