31
A triple riveted butt joint with double straps of unequal width is to be designed for a boiler shell. The pitch of the rivets in the outer row is double the pitch in the inner row and zigzag riveting is proposed. Which of the following statement is correct?
A)
There are four rivets per pitch length, all in double shear
B)
There are four rivets per pitch length, out of which two are in single shear and two are in double shear
C)
There are five rivets per pitch length, all in double shear
D)
There are five rivets per pitch length, out of which four are in double shear and one is in single shear
Answer & Solution
Answer: Option
D
32
Which of the following statement is correct?
A)
The stress concentration in static loading is more serious in ductile materials and less serious in brittle materials
B)
The stress concentration in static loading is more serious in brittle materials and less serious in ductile materials
C)
The toughness of a material increases when it is heated
D)
The shear stress in a beam varies from zero at the neutral surface and maximum at the outer fibres
Answer & Solution
Answer: Option
B
33
Which of the following statement is correct?
A)
The cold rolled shafting is stronger than hot rolled shafting
B)
The hot rolled shafting is stronger than cold rolled shafting
C)
The cold rolled and hot rolled shafting are equally strong
D)
The shafts are not made by rolling process
Answer & Solution
Answer: Option
A
34
Which of the following statement is correct?
A)
The distance from a point on one thread to the corresponding point on the next thread is called pitch
B)
The distance which a screw thread advances axially in one rotation of the nut is called lead
C)
In single start threads, lead is equal to pitch
D)
All of the above
Answer & Solution
Answer: Option
D
35
Which of the following statement is correct?
A)
A parallel sunk key is a taperless key
B)
A parallel sunk key may be rectangular or square in cross-section
C)
A flat saddle key is a taper key which fits in a key way of the hub and is flat on the shaft
D)
All of the above
Answer & Solution
Answer: Option
D
36
When two non-intersecting and non-coplanar shafts are connected by gears, the arrangement is known as
A)
Spur gearing
B)
Helical gearing
C)
Bevel gearing
D)
Spiral gearing
Answer & Solution
Answer: Option
D
37
The permissible stress for carbon steel under static loading is generally taken as
A)
2,000 - 3,000 kg/m2
B)
3,000 - 4,000 kg/cm2
C)
4,000 - 4,500 kg/cm2
D)
7,500 - 10,000 kg/cm2
Answer & Solution
Answer: Option
C
38
The strength of the unriveted plate (P) per pitch length is equal to
A)
$${\text{pd}}{\sigma _{\text{t}}}$$
B)
$${\text{pt}}{\sigma _{\text{t}}}$$
C)
$$\left( {{\text{p}} - {\text{d}}} \right){\sigma _{\text{t}}}$$
D)
$$\left( {{\text{p}} - {\text{d}}} \right){\text{t}}{\sigma _{\text{t}}}$$
Answer & Solution
Answer: Option
B
39
The condition for maximum power transmission is that the maximum tension in the flat belt should be equal to
A)
$$3{{\text{P}}_{\text{c}}}$$
B)
$${{\text{P}}_{\text{c}}}$$
C)
$$\frac{{{{\text{P}}_{\text{c}}}}}{3}$$
D)
$$2{{\text{P}}_{\text{c}}}$$
Answer & Solution
Answer: Option
A
40
Surface endurance limit of gear material is dependent upon its
A)
Elastic strength
B)
Yield strength
C)
Brinell hardness number
D)
Toughness
Answer & Solution
Answer: Option
C
