When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)

Machine Design
When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)

(WD/ πd3) × K

(4WD/ πd3) × K

(8WD/ πd3) × K

(2WD/ πd3) × K

(WD/ πd3) × K

(4WD/ πd3) × K

(8WD/ πd3) × K

(2WD/ πd3) × K

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Machine Design
Which of the following bearing is preferred for oscillating conditions?

Angular contact single row ball bearing

Needle roller bearing

Taper roller bearing

Double row roller bearing

Angular contact single row ball bearing

Needle roller bearing

Taper roller bearing

Double row roller bearing

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Machine Design
A double fillet welded joint with parallel fillet weld of length 'l' and leg 's' is subjected to a tensile force 'P'. Assuming uniform stress distribution, the shear stress in the weld is given by

2P/s.l

P/2.s.l

√2P/s.l

P/√2.s.l

2P/s.l

P/2.s.l

√2P/s.l

P/√2.s.l

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Machine Design
When the shaft rotates in anticlockwise direction at high speed in a bearing, it will

Move towards right of the bearing making no metal to metal contact

Have contact at the bottom most of the bearing

Move towards left of the bearing making metal to metal contact

Move towards right of the bearing making metal to metal contact

Move towards right of the bearing making no metal to metal contact

Have contact at the bottom most of the bearing

Move towards left of the bearing making metal to metal contact

Move towards right of the bearing making metal to metal contact

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Machine Design
Which of the following statement is correct regarding power screws?

The efficiency of Acme (trapezoidal) thread is less than that of a square thread

If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%

Both (A) and (B)

The efficiency of a self locking screw can not be more than 50%

The efficiency of Acme (trapezoidal) thread is less than that of a square thread

If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%

Both (A) and (B)

The efficiency of a self locking screw can not be more than 50%

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Machine Design
For high speed engines, the cam follower should move with

Simple harmonic motion

Uniform velocity

Cycloidal motion

Uniform acceleration and retardation

Simple harmonic motion

Uniform velocity

Cycloidal motion

Uniform acceleration and retardation

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Machine Design

Machine Design Which of the following bearing is preferred for oscillating conditions?

Machine Design A double fillet welded joint with parallel fillet weld of length 'l' and leg 's' is subjected to a tensile force 'P'. Assuming uniform stress distribution, the shear stress in the weld is given by

Machine Design When the shaft rotates in anticlockwise direction at high speed in a bearing, it will

Machine Design Which of the following statement is correct regarding power screws?

Machine Design For high speed engines, the cam follower should move with

Machine Design
Which of the following bearing is preferred for oscillating conditions?

Machine Design
A double fillet welded joint with parallel fillet weld of length 'l' and leg 's' is subjected to a tensile force 'P'. Assuming uniform stress distribution, the shear stress in the weld is given by

Machine Design
When the shaft rotates in anticlockwise direction at high speed in a bearing, it will

Machine Design
Which of the following statement is correct regarding power screws?

Machine Design
For high speed engines, the cam follower should move with