Engineering Multiple Choice Questions(MCQs)& Answers
1
The maximum permissible slenderness ratio of compression member carrying dead and superimposed load, is
2
The maximum axial load which is just sufficient to keep a column in a small deflected shape, is called
A
Critical load
B
Buckling load
C
Crippling load
D
All the above
3
A 20 mm dia steel bar which is subjected to an axial tension of 2300 kg/cm2 produces a strain of 0.04 cm. If Young’s modulus of steel is 2.1 × 106 kg/cm2, the bar is
A
In the elastic range
B
In the plastic range
C
At yield point
D
None of these
Answer: In the elastic range
4
The slenderness ratio of a column is zero when its length
A
Is between the points of zero moments
B
Is supported on all sides throughout its length
C
Is equal to its radius of gyration
D
Is zero
Answer: Is between the points of zero moments
5
The permissible bearing stress in steel, is
A
1890 kg/cm2
B
2025 kg/cm2
C
1500 kg/cm2
D
2340 kg/cm2
6
The distance measured along one rivet line from the centre of a rivet to the centre of adjoining rivet on an adjacent parallel rivet line, is called
A
Staggered pitch
B
Gauge distance of rivet
C
Pitch of rivet
D
All the above
7
The average shear stress for rolled steel beam section, is
A
845 kg/cm2
B
945 kg/cm2
C
1025 kg/cm2
D
1500 kg/cm2
8
A structural member subjected to compressive stress in a direction parallel to its longitudinal axis, is generally known as
A
Post
B
Stanchion
C
Column
D
All the above
9
IS : 800 – 1971 recommends that in a splice plate the number of rivets carrying calculated shear stress through a packing greater than 6 mm thick, is to be increased by 2.5% for every
A
1.00 mm thickness of packing
B
1.50 mm thickness of packing
C
2.0 mm thickness of packing
D
2.50 mm thickness of packing
Answer: 2.0 mm thickness of packing
10
A riveted joint may experience
A
Bearing failure
B
Shear failure of plates
C
Shear failure
D
All the above
11
The main advantage of a steel member, is:
A
Its long service life
B
Its gas and water tightness
C
Its high strength
D
All the above
12
A compression member consisting of angle sections may be a
A
Discontinuous double angle strut
B
Discontinuous single angle strut
C
Continuous member
D
All the above
13
The allowable stress in axial tension for rolled I-sections and channels, is taken as
A
1500 kg/cm2
B
2125 kg/cm2
C
1420 kg/cm2
D
1810 kg/cm2
14
The ratio of longitudinal stress to strain within elastic limit, is known as
A
Bulk modulus of elasticity
B
Modulus of elasticity
C
Shear modulus of elasticity
D
All the above
Answer: Modulus of elasticity
15
Effective sectional area of a compression member is:
A
Gross sectional area + area of rivet hole
B
Gross sectional area – area of rivet hole
C
Gross sectional area + area of rivet hole
D
Gross sectional area × area of rivet hole
Answer: Gross sectional area – area of rivet hole
16
Diameter of a bolt hole is usually taken as
A
Gross diameter of bolt
B
Nominal diameter + 1.5 mm
C
Nominal diameter + 2.0 mm
D
Nominal diameter of bolt
Answer: Nominal diameter + 1.5 mm
17
Other conditions being same, the load factor in indeterminate structures is
A
equal to load factor in determinate structures
B
more than the load factor in determinate structures
C
less than the load factor in determinate structures
D
unpredictable
Answer: more than the load factor in determinate structures
18
Which of the following conditions is to be satisfied both in elastic and plastic analysis ?
A
plastic moment condition
B
equilibrium condition
C
yield condition
D
mechanism condition
Answer: equilibrium condition
19
The most economical section for a column, is
A
rectangular
B
solid round
C
flat strip
D
tubular section
20
Tacking rivets in compression plates not exposed to the weather, have a pitch not exceeding 300 mm or
A
16 times the thickness of outside plate
B
24 times the thickness of outside plate
C
32 times the thickness of outside plate
D
36 times the thickness of outside plate
Answer: 32 times the thickness of outside plate
21
Other conditions being same, the load factor in indeterminate structures is
A
equal to load factor in determinate structures
B
more than the load factor in determinate structures
C
less than the load factor in determinate structures
D
unpredictable
Answer: more than the load factor in determinate structures
22
Which of the following conditions is to be satisfied both in elastic and plastic analysis ?
A
plastic moment condition
B
equilibrium condition
C
yield condition
D
mechanism condition
Answer: equilibrium condition
23
The most economical section for a column, is
A
rectangular
B
solid round
C
flat strip
D
tubular section
24
Tacking rivets in compression plates not exposed to the weather, have a pitch not exceeding 300 mm or
A
16 times the thickness of outside plate
B
24 times the thickness of outside plate
C
32 times the thickness of outside plate
D
36 times the thickness of outside plate
Answer: 32 times the thickness of outside plate
25
The maximum permissible slenderness ratio of compression member carrying dead and superimposed load, is
26
The maximum axial load which is just sufficient to keep a column in a small deflected shape, is called
A
Critical load
B
Buckling load
C
Crippling load
D
All the above
27
A 20 mm dia steel bar which is subjected to an axial tension of 2300 kg/cm2 produces a strain of 0.04 cm. If Young’s modulus of steel is 2.1 × 106 kg/cm2, the bar is
A
In the elastic range
B
In the plastic range
C
At yield point
D
None of these
Answer: In the elastic range
28
The slenderness ratio of a column is zero when its length
A
Is between the points of zero moments
B
Is supported on all sides throughout its length
C
Is equal to its radius of gyration
D
Is zero
Answer: Is between the points of zero moments
29
The permissible bearing stress in steel, is
A
1890 kg/cm2
B
2025 kg/cm2
C
1500 kg/cm2
D
2340 kg/cm2
30
The distance measured along one rivet line from the centre of a rivet to the centre of adjoining rivet on an adjacent parallel rivet line, is called
A
Staggered pitch
B
Gauge distance of rivet
C
Pitch of rivet
D
All the above
31
The average shear stress for rolled steel beam section, is
A
845 kg/cm2
B
945 kg/cm2
C
1025 kg/cm2
D
1500 kg/cm2
32
A structural member subjected to compressive stress in a direction parallel to its longitudinal axis, is generally known as
A
Post
B
Stanchion
C
Column
D
All the above
33
IS : 800 – 1971 recommends that in a splice plate the number of rivets carrying calculated shear stress through a packing greater than 6 mm thick, is to be increased by 2.5% for every
A
1.00 mm thickness of packing
B
1.50 mm thickness of packing
C
2.0 mm thickness of packing
D
2.50 mm thickness of packing
Answer: 2.0 mm thickness of packing
34
A riveted joint may experience
A
Bearing failure
B
Shear failure of plates
C
Shear failure
D
All the above
35
The main advantage of a steel member, is:
A
Its long service life
B
Its gas and water tightness
C
Its high strength
D
All the above
36
A compression member consisting of angle sections may be a
A
Discontinuous double angle strut
B
Discontinuous single angle strut
C
Continuous member
D
All the above
37
The allowable stress in axial tension for rolled I-sections and channels, is taken as
A
1500 kg/cm2
B
2125 kg/cm2
C
1420 kg/cm2
D
1810 kg/cm2
38
The ratio of longitudinal stress to strain within elastic limit, is known as
A
Bulk modulus of elasticity
B
Modulus of elasticity
C
Shear modulus of elasticity
D
All the above
Answer: Modulus of elasticity
39
Effective sectional area of a compression member is:
A
Gross sectional area + area of rivet hole
B
Gross sectional area – area of rivet hole
C
Gross sectional area + area of rivet hole
D
Gross sectional area × area of rivet hole
Answer: Gross sectional area – area of rivet hole
40
Diameter of a bolt hole is usually taken as
A
Gross diameter of bolt
B
Nominal diameter + 1.5 mm
C
Nominal diameter + 2.0 mm
D
Nominal diameter of bolt
Answer: Nominal diameter + 1.5 mm
41
According to IS Specifications, the maximum pitch of rivets in compression is
A
lesser of 200 mm and 12 t
B
lesser of 200 mm and 161
C
lesser of 300 mm and 32 t
D
lesser of 3 00 mm and 24 t
Answer: lesser of 200 mm and 12 t
42
The actual thickness of butt weld as compared to the thickness of plate is usually
A
more
B
equal
C
less
D
none of the above
43
A butt weld is specified by
A
effective throat thickness
B
plate thickness
C
size of weld
D
penetration thickness
Answer: effective throat thickness
44
For a standard 45° fillet, the ratio of size of fillet to throat thickness is
A
1:1
B
1 : V2
C
V2 : 1
D
None
45
The effective length of a fillet weld should not be less than
A
two times the weld size
B
four times the weld size
C
six times the weld size
D
weld size
Answer: four times the weld size
46
In the cross-section of a weld, throat is the
A
minimum dimension
B
average dimension
C
maximum dimension
D
none of the above
Answer: minimum dimension
47
When the bolts are subjected to reversal of stresses, the most suitable type of bolt is
A
high strength bolt
B
turned and fitted bolt
C
black bolt
D
ordinary unfinished bolt
Answer: high strength bolt
48
Diameter of a bolt hole is usually taken as
A
nominal diameter + 1.5 mm
B
gross diameter of bolt
C
nominal diameter + 2.0 mm
D
nominal diameter of bolt
Answer: nominal diameter + 1.5 mm
49
Bolts are most suitable to carry
A
axial tension
B
shear and bending
C
bending
D
shear
50
Select the correct statement
A
Material cost of a rivet is higher than that of a bolt.
B
Tensile strength of a bolt is lesser than that of a rivet.
C
Bolts are used as a temporary fastenings whereas rivets are used as permanent fastenings.
D
Riveting is less noisy than bolting.
Answer: Bolts are used as a temporary fastenings whereas rivets are used as permanent fastenings.
51
Efficiency of a riveted joint, having the minimum pitch as per IS : 800, is
52
By providing sufficient edge distance, which of the following failures of riveted joint can be avoided ?
A
tension failure of the plate
B
shear failure of the rivet
C
shear failure of the plate
D
crushing failure of the rivet
Answer: shear failure of the plate
53
If the thickness of plate to be connected by a rivet is 16 mm, then suitable size of rivet as per Unwin’s formula will be
A
16 mm
B
20 mm
C
24 mm
D
27 mm
54
As compared to field rivets, the shop rivets are
A
stronger
B
equally strong
C
weaker
D
any of the above
55
The difference between gross diameter and nominal diameter for the rivets up to 25 mm diameter is
A
1.0 mm
B
1.5 mm
C
2.5 mm
D
None
56
Which of the following types of riveted joint is free from bending stresses ?
A
lap joint
B
butt joint with single cover plate
C
butt joint with double cover plates
D
none of the above
Answer: butt joint with double cover plates
57
When the axis of load lies in the plane of rivet group, then the most heavily loaded rivet will be the one which
A
gives the minimum angle between the two forces Fa and Fm
B
gives the maximum angle between the two forces Fa and Fm
C
is at the minimum distance from CG of the rivet group
D
is at the maximum distance from CG of the rivet group
Answer: gives the minimum angle between the two forces Fa and Fm
58
When the axis of load lies in the plane of rivet group, then the rivets are subjected to
A
only shear stresses
B
only tensile stresses
C
both (a) and (b)
D
none of the above
Answer: only shear stresses
59
In a gusseted base, when the end of the column is machined for complete bearing on the base plate, then the axial load is assumed to be transferred to base plate
A
fully by direct bearing
B
fully through fastenings
C
50% by direct bearing and 50% through fastenings
D
75% by direct bearing and 25% through fastenings
Answer: 50% by direct bearing and 50% through fastenings
60
Bending compressive and tensile stresses respectively are calculated based on
A
net area and gross area
B
gross area and net area
C
net area in both cases
D
gross area in both cases
Answer: gross area and net area