A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

Machine Design
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

τ/2

4 τ

2 τ

τ

τ/2

4 τ

2 τ

τ

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Machine Design
Ball bearing type screws are found in following application

Aeroplane engines

Crane

Screw jack

Steering mechanism

Aeroplane engines

Crane

Screw jack

Steering mechanism

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Machine Design
A hollow shaft will transmit a __________ torque than a solid shaft of the same mass and same material.

Smaller

None of these

Medium

Greater

Smaller

None of these

Medium

Greater

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Machine Design
Which is correct statement? Stress concentration in static loading is

Seriousness would depend on other factors

Very serious in brittle materials and less serious in ductile materials

Very serious in ductile materials and less serious in brittle materials

Equally serious in both types of materials

Seriousness would depend on other factors

Very serious in brittle materials and less serious in ductile materials

Very serious in ductile materials and less serious in brittle materials

Equally serious in both types of materials

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Machine Design
A shaft is subjected to fluctuating loads for which the normal torque (T) and bending moment (M) are 1000 N-m and 500 N-m respectively. If the combined shock and fatigue factor for bending is 1.5 and combined shock and fatigue factor for torsion is 2, then the equivalent twisting moment for the shaft is

2050 N-m

2136 N-m

2000 N-m

2100 N-m

2050 N-m

2136 N-m

2000 N-m

2100 N-m

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

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

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

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

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

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Machine Design

Machine Design Ball bearing type screws are found in following application

Machine Design A hollow shaft will transmit a __________ torque than a solid shaft of the same mass and same material.

Machine Design Which is correct statement? Stress concentration in static loading is

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

Machine Design
Ball bearing type screws are found in following application

Machine Design
A hollow shaft will transmit a __________ torque than a solid shaft of the same mass and same material.

Machine Design
Which is correct statement? Stress concentration in static loading is

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