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Oil of viscosity 0.085 Ns/m2 is filled between two 120 cm long concentric cylinders having inner and outer radius as 5cm and 6cm. If the inner cylinder is fixed and outer cylinder, I rotate at 900 rpm. If the inner cylinder is also rotating at 500 rpm in the same direction as that of outer cylinder. Then percentage reduction in shear stress is
  • a)
    66.7% reduction in shear tress
  • b)
    55.6% increment in shear stress
  • c)
    50% increment in hear stress
  • d)
    55.6% reduction in shear stress
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Oil of viscosity 0.085 Ns/m2 is filled between two 120 cm long concent...
We know that shear stress is given by
When inner cylinder is fixed.
= 2883.98N/m2
When outer cylinder is rotated at 500 rpm in same direction,
the net rotation of outer cylinder = 900 – 500
= 400 rpm
=1281.769N/m2
% age change in shear stress
= 55.56%
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Oil of viscosity 0.085 Ns/m2 is filled between two 120 cm long concentric cylinders having inner and outer radius as 5cm and 6cm. If the inner cylinder is fixed and outer cylinder, I rotate at 900 rpm. If the inner cylinder is also rotating at 500 rpm in the same direction as that of outer cylinder. Then percentage reduction in shear stress isa)66.7% reduction in shear tressb)55.6% increment in shear stressc)50% increment in hear stressd)55.6% reduction in shear stressCorrect answer is option 'D'. Can you explain this answer?
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Oil of viscosity 0.085 Ns/m2 is filled between two 120 cm long concentric cylinders having inner and outer radius as 5cm and 6cm. If the inner cylinder is fixed and outer cylinder, I rotate at 900 rpm. If the inner cylinder is also rotating at 500 rpm in the same direction as that of outer cylinder. Then percentage reduction in shear stress isa)66.7% reduction in shear tressb)55.6% increment in shear stressc)50% increment in hear stressd)55.6% reduction in shear stressCorrect answer is option 'D'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about Oil of viscosity 0.085 Ns/m2 is filled between two 120 cm long concentric cylinders having inner and outer radius as 5cm and 6cm. If the inner cylinder is fixed and outer cylinder, I rotate at 900 rpm. If the inner cylinder is also rotating at 500 rpm in the same direction as that of outer cylinder. Then percentage reduction in shear stress isa)66.7% reduction in shear tressb)55.6% increment in shear stressc)50% increment in hear stressd)55.6% reduction in shear stressCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Oil of viscosity 0.085 Ns/m2 is filled between two 120 cm long concentric cylinders having inner and outer radius as 5cm and 6cm. If the inner cylinder is fixed and outer cylinder, I rotate at 900 rpm. If the inner cylinder is also rotating at 500 rpm in the same direction as that of outer cylinder. Then percentage reduction in shear stress isa)66.7% reduction in shear tressb)55.6% increment in shear stressc)50% increment in hear stressd)55.6% reduction in shear stressCorrect answer is option 'D'. Can you explain this answer?.
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