 # Machine Design MCQ

### 1.The centre to centre distance between two consecutive rivets in a row, is called

• AMargin
• BPitch
• CBack pitch
• DDiagonal pitch
Correct Answer : (B)

Pitch

Explanation:

### 2.The bending stress in a curved beam is

• AZero at the centroidal axis
• BZero at the point other than centroidal axis
• CMaximum at the neutral axis
• DNone of these
Correct Answer : (B)

Zero at the point other than centroidal axis

Explanation:

### 3.The rated life of a bearing varies

• BInversely as square of load
• CInversely as cube of load
• DInversely as fourth power of load
Correct Answer : (C)

Inversely as cube of load

Explanation:

### 4.A cotter joint is used to connect two __________ rods

• ACo-axial
• BPerpendicular
• CPerpendicular
• DNone of these
Correct Answer : (A)

Co-axial

Explanation:

### 5.In a gear, having Involute teeth, the normal to the Involute is a tangent to the

• ABase circle
• BPitch circle
• DDedendum circle
Correct Answer : (A)

Base circle

Explanation:

### 6.The groove angle of the pulley for rope drive is usually

• A20°
• B35°
• C45°
• D60°
Correct Answer : (C)

45°

Explanation:

### 7.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/ π)1/2
• B(6V/ π)1/3
• C(6V/ π)2
• D(6V/ π)3
Correct Answer : (B)

(6V/ π)1/3

Explanation:

### 8.Which one of the following loading is considered for the design of axles?

• ABending moment only
• BTwisting moment only
• CCombined bending moment and twisting moments
• DCombined action of bending moment, twisting moment and axial thrust
Correct Answer : (A)

Bending moment only

Explanation:

### 9.The coefficient of friction between the belt and pulley depends upon the

• AMaterial of belt and pulley
• BSlip of belt
• CSpeed of belt
• DAll of these
Correct Answer : (D)

All of these

Explanation:

### 10.In a flange coupling, the bolts are subjected to

• ATensile stress
• BCompressive stress
• CShear stress
• DNone of these
Correct Answer : (C)

Shear stress

Explanation:

### 11.Transverse fillet welded joints are designed for

• ATensile strength
• BCompressive strength
• CShear strength
• DBending strength
Correct Answer : (A)

Tensile strength

Explanation:

### 12.The edges of the plates for cylindrical vessels are usually bevelled to an angle of 80° for

• AReducing stress concentration
• BEase of manufacture
• CSafety
• DFullering and caulking
Correct Answer : (D)

Fullering and caulking

Explanation:

### 13.In a boundary lubricated bearing, there is a __________ of lubricant between the journal and the bearing.

• AThick film
• BThin film
• CEither A or B
• DNone of these
Correct Answer : (B)

Thin film

Explanation:

### 14.According to Unwin's formula, the relation between the diameter of rivet hole (d) and the thickness of plate (t) is given by (where d and t are in mm)

• Ad = √t
• Bd = 1.6√t
• Cd = 2√t
• Dd = 6√t
Correct Answer : (D)

d = 6√t

Explanation:

### 15.The buckling load will be maximum for a column, if

• AOne end of the column is clamped and the other end is free
• BBoth ends of the column are clamped
• CBoth ends of the column are hinged
• DOne end of the column is hinged and the other end is free
Correct Answer : (B)

Both ends of the column are clamped

Explanation:

### 16.The yield point in static loading is __________ as compared to fatigue loading.

• AHigher
• BLower
• CSame
• DNone of these
Correct Answer : (A)

Higher

Explanation:

### 17.In designing thick cylinders, the equation used is

• ALame's equation
• BBirnie's equation
• CClavarinos' equation
• DAll of these
Correct Answer : (D)

All of these

Explanation:

### 18.A double strap butt joint (with equal straps) is

• AAlways in single shear
• BAlways in double shear
• CEither in single shear or double shear
• DAny one of these
Correct Answer : (B)

Always in double shear

Explanation:

### 19.The valve rod in a steam engine is connected to an eccentric rod by

• ACotter joint
• BBolted joint
• CKnuckle joint
• DUniversal coupling
Correct Answer : (C)

Knuckle joint

Explanation:

### 20.The objective of idler pulley in belt drive is to

• ADecrease the tendency of belt to slip
• BIncrease the power transmission capacity
• CIncrease the wrap angle and belt tension
• DAll the above objectives
Correct Answer : (D)

All the above objectives

Explanation: