140 + Mcqs in Design of Machine Elements Page 3 McqOptions

101.	Which among the following statements is/are true? 1. Fracture of bolts occurs due to uneven distribution of impact energy  2. Castle nut is a locking device 3. Fine threads are stronger than coarse threads 4. Coarse threads apply more resistance when loosened
A.	Statement 2 and Statement 3
B.	Statement 1 and Statement 2
C.	Statement 3 and Statement 4
D.	All of the above
Answer» C. Statement 3 and Statement 4

Discussion

102.	Which of the following threads have greater pitch and lead angle for a given nominal diameter when compared with each other?
A.	Coarse threads
B.	Fine threads
C.	Both a. and b
D.	None of the above
Answer» B. Fine threads

Discussion

103.	Which type of screw fasteners are threaded at both the ends?
A.	Through bolt
B.	Tap bolt
C.	Studs
D.	All of the above
Answer» D. All of the above

Discussion

104.	What does the designation M 16 x 2 indicate?
A.	I.S.O. Metric fine thread
B.	I.S.O. Metric coarse thread
C.	B.S.F. Metric coarse thread
D.	B.S.F Metric fine thread
Answer» B. I.S.O. Metric coarse thread

Discussion

105.	Which type of screw fasteners are threaded through out its length?
A.	Cap screws
B.	Set screws
C.	Studs
D.	Tap bolt
Answer» C. Studs

Discussion

106.	Which type of joint is used if plate thickness is less than 5 mm?
A.	Single V butt weld
B.	Single U butt weld
C.	Square butt weld
D.	Double U butt weld
Answer» D. Double U butt weld

Discussion

107.	Calculate weld size if weld throat thickness for the fillet weld is 8.2 mm
A.	10 mm
B.	14.20 mm
C.	16.4 mm
D.	12 mm
Answer» E.

Discussion

108.	Free length for helical compression springs having square ends is given as ________.
A.	pn + 2d
B.	pn + 3d
C.	2(p + d)
D.	pn + 4d
Answer» C. 2(p + d)

Discussion

109.	What is the Wahl's factor if spring index is 6?
A.	1.477
B.	0.995
C.	1.252
D.	None of the above
Answer» D. None of the above

Discussion

110.	Why are mechanical springs used?
A.	To apply force
B.	To store energy
C.	To measure force
D.	All of the above
Answer» E.

Discussion

111.	Which of the following statements is/are true? 1. In volute springs, number of active coils gradually decreases as load increases 2. Stiffness of spring decreases as number of coils decreases in conical springs 3. Torsion springs are generally spiral 4. Helical torsion springs are used in automobile starters
A.	Statements 1 and 3
B.	Statements 2, 3 and 4
C.	Statements 1, 3 and 4
D.	All of the above
Answer» D. All of the above

Discussion

112.	In which condition the axial distance between two adjacent coils is called as pitch?
A.	Compressed condition
B.	Uncompressed condition
C.	Both a. and b.
D.	None of the above
Answer» C. Both a. and b.

Discussion

113.	The application factor depends on ______
A.	prime mover
B.	hours of operation per day
C.	machine driven
D.	all of the above
Answer» E.

Discussion

114.	What is meant by application factor?
A.	Ratio of maximum torque and average torque
B.	Ratio of maximum load and average load
C.	Both a. and b.
D.	None of the above
Answer» D. None of the above

Discussion

115.	What is meant by Aesthetics?
A.	Interaction between man machine working environment
B.	Appearance of the product
C.	Both a. and b.
D.	None of the above
Answer» B. Appearance of the product

Discussion

116.	Which among the following is a knuckle joint?
A.	Tension link in bridge structure
B.	Foundation bolt
C.	Both a. and b.
D.	None of the above
Answer» B. Foundation bolt

Discussion

117.	What are assumptions made during stress analysis of curved beams?
A.	The material is nonisotropic
B.	The material is non homogeneous
C.	The material obeys hookes law
D.	All of the above
Answer» D. All of the above

Discussion

118.	Which factors are responsible for the failure of a component due to buckling?
A.	Yielding
B.	Plastic deformation
C.	Elastic instability
D.	All of the above
Answer» D. All of the above

Discussion

119.	Calculate diameter of shaft using maximum principle stress theory, when equivalent bending moment of 900 x 103 N-mm acts on the shaft when maximum tensile stress does not exceed 50 N/mm2 and equivalent torque of 700 N-m acts on it.
A.	56.80 mm
B.	52.24 mm
C.	50 mm
D.	None of the above
Answer» B. 52.24 mm

Discussion

120.	A shaft transmits power of 30 kW. According to maximum principle stress theory and shear theory diameter of shaft is 70 mm and 73 mm respectively. Tensile stress acting on the shaft is 50 Mpa. What will be the shaft diameter to transmit power?
A.	65 mm
B.	70 mm
C.	73 mm
D.	Insufficient data
Answer» D. Insufficient data

Discussion

121.	Universal coupling is a type of  ____
A.	Flexible coupling
B.	Rigid coupling
C.	Both a. and b.
D.	None of the above
Answer» B. Rigid coupling

Discussion

122.	Why are rigid couplings used?
A.	To connect diesel engine and generator
B.	To connect eccentric shafts
C.	To connect electric motor to pump
D.	None of the above
Answer» D. None of the above

Discussion

123.	Calculate fatigue stress concentration factor, when theoretical stress concentration factor is 1.62 and notch sensitivity is equal to 0.9
A.	1.558
B.	3.358
C.	1.162
D.	None of the above
Answer» B. 3.358

Discussion

124.	Line joining Syt (yield strength of the material) on mean stress axis and Se (endurance limit of the component) on stress amplitude axis is called as _____
A.	Goodman line
B.	Soderberg line
C.	Gerber line
D.	None of the above
Answer» C. Gerber line

Discussion

125.	To predict failure in design components which failure criteria is not assumed, when mean stress and stress amplitude are nonzero?
A.	Goodman criterion
B.	Soderberg criteria
C.	Gerber criteria
D.	None of the above
Answer» E.

Discussion

126.	In power screws, if friction angle Φ is less than lead angle λ, then the screw undergoes
A.	over hauling
B.	self locking
C.	both a. and b.
D.	none of the above
Answer» B. self locking

Discussion

127.	The efficiency of power screw can be improved if ______
A.	the rolling friction is replaced by sliding friction in the screw threads
B.	the sliding friction is replaced by rolling friction in the screw threads
C.	both a. and b.
D.	none of the above
Answer» C. both a. and b.

Discussion

128.	Calculate torque required to overcome thread friction if axial load of 8 kN acts on a power screw having double start square threads of 30 mm mean diameter. Friction angle and lead angle are 7o and 9o respectively
A.	68.81 N-m
B.	41.90 N-m
C.	34.40 N-m
D.	Insufficient data
Answer» D. Insufficient data

Discussion

129.	Which type of stress is induced in a screw body?
A.	Bearing pressure
B.	Direct shear stress
C.	Torsional shear stress
D.	None of the above
Answer» D. None of the above

Discussion

130.	Drilling axial hole is a method used to achieve ______
A.	uniform strength
B.	uniform stress
C.	uniform toughness
D.	all of the above
Answer» B. uniform stress

Discussion

131.	Threads used in screw fasteners are ______
A.	having high strength
B.	having low efficiency
C.	single start type
D.	all of the above
Answer» E.

Discussion

132.	Which among the following is the condition to avoid separation of connected members?
A.	Force acting on the connected members should be negative
B.	Force acting on the connected members should be positive
C.	Force acting on the connected members should be neither positive nor negative
D.	None of the above
Answer» B. Force acting on the connected members should be positive

Discussion

133.	When a coupler nut is subjected to crushing stress, crushing failure can be avoided if _____
A.	crushing stress induced is more than permissible crushing stress in the nut
B.	permissible crushing stress is more than crushing stress induced in the threads
C.	crushing stress induced is equal to permissible crushing stress
D.	all of the above
Answer» C. crushing stress induced is equal to permissible crushing stress

Discussion

134.	If welds are designed with in-plane eccentric load, then eccentric load can be replaced by
A.	parallel force
B.	twisting moment
C.	both a. and b.
D.	none of the above
Answer» D. none of the above

Discussion

135.	Which of the following statements is/are false? 1. Under fatigue load, casted structures are stronger than welded structures 2. Welding cannot produce complicated structures 3. Welding can join dissimilar materials 4. Rivetted joints produce light weight constructions as compared to welded joints
A.	Statement 1 and Statement 3
B.	Statement 1, 2 and Statement 4
C.	Statement 1, 2 and Statement 3
D.	All the above statements are false
Answer» C. Statement 1, 2 and Statement 3

Discussion

136.	Solid length for helical compression springs having square and ground ends is given as _________.
A.	(n + 2)d
B.	(n + 3)d
C.	(n + 1)d
D.	None of the above
Answer» B. (n + 3)d

Discussion

137.	Which type of springs have only active coils?
A.	Helical compression springs
B.	Helical tension springs
C.	Both a. and b.
D.	None of the above
Answer» C. Both a. and b.

Discussion

138.	The shear stress concentration factor (Ks) in mechanical springs is given as _____
A.	(1 + 0.5 / C)
B.	0.615 / C
C.	(1 + 0.615 / C)
D.	[(4C – 1) / (4C + 1)] + [0.615 / C]
Answer» D. [(4C – 1) / (4C + 1)] + [0.615 / C]

Discussion

139.	Which factor is used to consider the effects of direct shear stress and torsional shear stress when curvature effect stress is not considered?
A.	Shear stress concentration factor
B.	Wahl shear stress concentration factor
C.	Both a. and b.
D.	None of the above
Answer» B. Wahl shear stress concentration factor

Discussion

140.	Determine number of coils in a helical compression spring, if modulus of rigidity is 80 Gpa and spring stiffness is 50 N/ mm. Assume wire diameter and spring index as 8 mm and 5 respectively
A.	11.8 turns
B.	12.8 turns
C.	13.3 turns
D.	None of the above
Answer» C. 13.3 turns

Discussion

Explore topic-wise MCQs in ENGINEERING SERVICES EXAMINATION (ESE).

&nbsp;Which&nbsp;of&nbsp;the&nbsp;following&nbsp;threads&nbsp;have&nbsp;greater&nbsp;pitch&nbsp;and&nbsp;lead&nbsp;angle&nbsp;for&nbsp;a&nbsp;given&nbsp;nominal&nbsp;diameter&nbsp;when&nbsp;compared&nbsp;with&nbsp;each&nbsp;other?&nbsp;

&nbsp;Which&nbsp;type&nbsp;of&nbsp;screw&nbsp;fasteners&nbsp;are&nbsp;threaded&nbsp;at&nbsp;both&nbsp;the&nbsp;ends?

&nbsp;What&nbsp;does&nbsp;the&nbsp;designation&nbsp;M&nbsp;16&nbsp;x&nbsp;2&nbsp;indicate?&nbsp;

Which&nbsp;type&nbsp;of&nbsp;screw&nbsp;fasteners&nbsp;are&nbsp;threaded&nbsp;through&nbsp;out&nbsp;its&nbsp;length?&nbsp;

Which&nbsp;type&nbsp;of&nbsp;joint&nbsp;is&nbsp;used&nbsp;if&nbsp;plate&nbsp;thickness&nbsp;is&nbsp;less&nbsp;than&nbsp;5&nbsp;mm?&nbsp;

&nbsp;Calculate&nbsp;weld&nbsp;size&nbsp;if&nbsp;weld&nbsp;throat&nbsp;thickness&nbsp;for&nbsp;the&nbsp;fillet&nbsp;weld&nbsp;is&nbsp;8.2&nbsp;mm&nbsp;

Free&nbsp;length&nbsp;for&nbsp;helical&nbsp;compression&nbsp;springs&nbsp;having&nbsp;square&nbsp;ends&nbsp;is&nbsp;given&nbsp;as&nbsp;________.&nbsp;

&nbsp;What&nbsp;is&nbsp;the&nbsp;Wahl&#39;s&nbsp;factor&nbsp;if&nbsp;spring&nbsp;index&nbsp;is&nbsp;6?

Why&nbsp;are&nbsp;mechanical&nbsp;springs&nbsp;used?&nbsp;

&nbsp;In&nbsp;which&nbsp;condition&nbsp;the&nbsp;axial&nbsp;distance&nbsp;between&nbsp;two&nbsp;adjacent&nbsp;coils&nbsp;is&nbsp;called&nbsp;as&nbsp;pitch?&nbsp;

&nbsp;The&nbsp;application&nbsp;factor&nbsp;depends&nbsp;on&nbsp;______&nbsp;

&nbsp;What&nbsp;is&nbsp;meant&nbsp;by&nbsp;application&nbsp;factor?&nbsp;

&nbsp;What&nbsp;is&nbsp;meant&nbsp;by&nbsp;Aesthetics?

Which&nbsp;among&nbsp;the&nbsp;following&nbsp;is&nbsp;a&nbsp;knuckle&nbsp;joint?&nbsp;

What&nbsp;are&nbsp;assumptions&nbsp;made&nbsp;during&nbsp;stress&nbsp;analysis&nbsp;of&nbsp;curved&nbsp;beams?&nbsp;

Which&nbsp;factors&nbsp;are&nbsp;responsible&nbsp;for&nbsp;the&nbsp;failure&nbsp;of&nbsp;a&nbsp;component&nbsp;due&nbsp;to&nbsp;buckling?&nbsp;

Universal&nbsp;coupling&nbsp;is&nbsp;a&nbsp;type&nbsp;of&nbsp;&nbsp;____&nbsp;

&nbsp;Why&nbsp;are&nbsp;rigid&nbsp;couplings&nbsp;used?&nbsp;

Calculate&nbsp;fatigue&nbsp;stress&nbsp;concentration&nbsp;factor,&nbsp;when&nbsp;theoretical&nbsp;stress&nbsp;concentration&nbsp;factor&nbsp;is&nbsp;1.62&nbsp;and&nbsp;notch&nbsp;sensitivity&nbsp;is&nbsp;equal&nbsp;to&nbsp;0.9&nbsp;

Line&nbsp;joining&nbsp;Syt&nbsp;(yield&nbsp;strength&nbsp;of&nbsp;the&nbsp;material)&nbsp;on&nbsp;mean&nbsp;stress&nbsp;axis&nbsp;and&nbsp;Se&nbsp;(endurance&nbsp;limit&nbsp;of&nbsp;the&nbsp;component)&nbsp;on&nbsp;stress&nbsp;amplitude&nbsp;axis&nbsp;is&nbsp;called&nbsp;as&nbsp;_____&nbsp;

&nbsp;To&nbsp;predict&nbsp;failure&nbsp;in&nbsp;design&nbsp;components&nbsp;which&nbsp;failure&nbsp;criteria&nbsp;is&nbsp;not&nbsp;assumed,&nbsp;when&nbsp;mean&nbsp;stress&nbsp;and&nbsp;stress&nbsp;amplitude&nbsp;are&nbsp;nonzero?&nbsp;

&nbsp;In&nbsp;power&nbsp;screws,&nbsp;if&nbsp;friction&nbsp;angle&nbsp;&Phi;&nbsp;is&nbsp;less&nbsp;than&nbsp;lead&nbsp;angle&nbsp;&lambda;,&nbsp;then&nbsp;the&nbsp;screw&nbsp;undergoes&nbsp;

The&nbsp;efficiency&nbsp;of&nbsp;power&nbsp;screw&nbsp;can&nbsp;be&nbsp;improved&nbsp;if&nbsp;______&nbsp;

Which&nbsp;type&nbsp;of&nbsp;stress&nbsp;is&nbsp;induced&nbsp;in&nbsp;a&nbsp;screw&nbsp;body?&nbsp;

Drilling&nbsp;axial&nbsp;hole&nbsp;is&nbsp;a&nbsp;method&nbsp;used&nbsp;to&nbsp;achieve&nbsp;______&nbsp;

Threads&nbsp;used&nbsp;in&nbsp;screw&nbsp;fasteners&nbsp;are&nbsp;______&nbsp;

&nbsp;Which&nbsp;among&nbsp;the&nbsp;following&nbsp;is&nbsp;the&nbsp;condition&nbsp;to&nbsp;avoid&nbsp;separation&nbsp;of&nbsp;connected&nbsp;members?&nbsp;

When&nbsp;a&nbsp;coupler&nbsp;nut&nbsp;is&nbsp;subjected&nbsp;to&nbsp;crushing&nbsp;stress,&nbsp;crushing&nbsp;failure&nbsp;can&nbsp;be&nbsp;avoided&nbsp;if&nbsp;_____&nbsp;

If&nbsp;welds&nbsp;are&nbsp;designed&nbsp;with&nbsp;in-plane&nbsp;eccentric&nbsp;load,&nbsp;then&nbsp;eccentric&nbsp;load&nbsp;can&nbsp;be&nbsp;replaced&nbsp;by&nbsp;

Solid&nbsp;length&nbsp;for&nbsp;helical&nbsp;compression&nbsp;springs&nbsp;having&nbsp;square&nbsp;and&nbsp;ground&nbsp;ends&nbsp;is&nbsp;given&nbsp;as&nbsp;_________.&nbsp;

Which&nbsp;type&nbsp;of&nbsp;springs&nbsp;have&nbsp;only&nbsp;active&nbsp;coils?

&nbsp;The&nbsp;shear&nbsp;stress&nbsp;concentration&nbsp;factor&nbsp;(Ks)&nbsp;in&nbsp;mechanical&nbsp;springs&nbsp;is&nbsp;given&nbsp;as&nbsp;_____

Which&nbsp;factor&nbsp;is&nbsp;used&nbsp;to&nbsp;consider&nbsp;the&nbsp;effects&nbsp;of&nbsp;direct&nbsp;shear&nbsp;stress&nbsp;and&nbsp;torsional&nbsp;shear&nbsp;stress&nbsp;when&nbsp;curvature&nbsp;effect&nbsp;stress&nbsp;is&nbsp;not&nbsp;considered?&nbsp;

Which of the following threads have greater pitch and lead angle for a given nominal diameter when compared with each other?

Which type of screw fasteners are threaded at both the ends?

What does the designation M 16 x 2 indicate?

Which type of screw fasteners are threaded through out its length?

Which type of joint is used if plate thickness is less than 5 mm?

Calculate weld size if weld throat thickness for the fillet weld is 8.2 mm

Free length for helical compression springs having square ends is given as ________.

What is the Wahl's factor if spring index is 6?

Why are mechanical springs used?

In which condition the axial distance between two adjacent coils is called as pitch?

The application factor depends on ______

What is meant by application factor?

What is meant by Aesthetics?

Which among the following is a knuckle joint?

What are assumptions made during stress analysis of curved beams?

Which factors are responsible for the failure of a component due to buckling?

Universal coupling is a type of ____

Why are rigid couplings used?

Calculate fatigue stress concentration factor, when theoretical stress concentration factor is 1.62 and notch sensitivity is equal to 0.9

Line joining Syt (yield strength of the material) on mean stress axis and Se (endurance limit of the component) on stress amplitude axis is called as _____

To predict failure in design components which failure criteria is not assumed, when mean stress and stress amplitude are nonzero?

In power screws, if friction angle Φ is less than lead angle λ, then the screw undergoes

The efficiency of power screw can be improved if ______

Which type of stress is induced in a screw body?

Drilling axial hole is a method used to achieve ______

Threads used in screw fasteners are ______

Which among the following is the condition to avoid separation of connected members?

When a coupler nut is subjected to crushing stress, crushing failure can be avoided if _____

If welds are designed with in-plane eccentric load, then eccentric load can be replaced by

Solid length for helical compression springs having square and ground ends is given as _________.

Which type of springs have only active coils?

The shear stress concentration factor (Ks) in mechanical springs is given as _____

Which factor is used to consider the effects of direct shear stress and torsional shear stress when curvature effect stress is not considered?