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ESE 2019: Machine Design Quiz-4
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Question 1
If a rectangular key of 8 mm width and 6mm height and a shaft of diameter 32 mm are made of same material, then the necessary length of the key for equal shear strength of shaft and key will be (neglecting stress concentration on the shaft)
Question 2
The critical point in shaft design will appear:
i. at a point where diameter change occur
ii. at a point having higher torque and bending moment
iii. at stress concentration point
i. at a point where diameter change occur
ii. at a point having higher torque and bending moment
iii. at stress concentration point
Question 3
Fillet weld with dimensions 75mm long, 8mm broad having 20KN fillet steady load along the weld. The factor of safety with 300MPa welded material shear strength will be:
Question 4
Consider the following statements in case of belt driver:
1). Centrifugal tension result in the increase the transmitted power.
2). Centrifugal tension does not affect the driving tension.
3). Maximum tension in the belt is always three times the centrifugal tension.
Which of these statements is/are correct?
1). Centrifugal tension result in the increase the transmitted power.
2). Centrifugal tension does not affect the driving tension.
3). Maximum tension in the belt is always three times the centrifugal tension.
Which of these statements is/are correct?
Question 5
Statement (I): Generally, for larger size pulleys, curved arms are used.
Statement (II): curved arms are less liable to fracture from internal stresses set-up due to unequal rates of cooling of the hub and the rim.
Statement (II): curved arms are less liable to fracture from internal stresses set-up due to unequal rates of cooling of the hub and the rim.
Question 6
If a bolt joins two members with metric thread of 5mm pitch carries a tightening axial force of 2000N, then find the value of torque needed to get such tightening force?
Question 7
Match List-I (Key/spline) with List-II (Application) and select the correct answer using the code given below the lists:
List-I
A). Gib head key
B). Woodruff key
C). Parallel key
D). Spines
List-II
1). Self aligning
2). Facilitates removal
3). Mostly used
4). Axial movement
List-I
A). Gib head key
B). Woodruff key
C). Parallel key
D). Spines
List-II
1). Self aligning
2). Facilitates removal
3). Mostly used
4). Axial movement
Question 8
In journal bearing design, the factor 
is called the ‘Bearing characteristic number’ where Z= absolute viscosity of the lubricant, N=speed of journal in rpm and P= bearing pressure on the projected bearing area. The value of 
corresponding to the minimum amount of friction is called the bearing modulus ‘K’. For hydrodynamic lubrication of the bearing, 
should be
is called the ‘Bearing characteristic number’ where Z= absolute viscosity of the lubricant, N=speed of journal in rpm and P= bearing pressure on the projected bearing area. The value of corresponding to the minimum amount of friction is called the bearing modulus ‘K’. For hydrodynamic lubrication of the bearing, should be Question 9
Consider the following:
V- belts are specified by their
1). Nominal inside length in mm
2). Nominal pitch length
3). Belt cross section symbol
4). weight/unit length of the belt
Which of these statements is/are correct?
V- belts are specified by their
1). Nominal inside length in mm
2). Nominal pitch length
3). Belt cross section symbol
4). weight/unit length of the belt
Which of these statements is/are correct?
Question 10
Which among the following cyclic stresses describes about Alternating Stress?
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