English
Hindi

Question

Download Solution PDF

A hollow shaft of same cross-section area as solid shaft transmits:

This question was previously asked in
NPCIL Stipendiary Trainee ME 2018
Download PDF Attempt in App
View all NPCIL Scientific Assistant Papers >
  1. Same torque
  2. Less torque
  3. More torque
  4. More or less depending on external diameter

Answer (Detailed Solution Below)

Option 3 : More torque
Free Tests
View all Free tests >
Free
NPCIL Scientific Assistant Quantum Mechanics Test
10 Qs. 10 Marks 13 Mins
Start Now

Detailed Solution

Download Solution PDF

Explanation:

As the cross-section area is the same,

Now torque ∝ polar moment

‘d1’ will be always greater than ‘ds’ for the given condition, hence 

Download Solution PDF
Latest NPCIL Scientific Assistant Updates

Last updated on Mar 27, 2025

-> NPCIL Scientific Assistant Recruitment Notification 2025 is out! 

->The Nuclear Power Corporation of India Limited (NPCIL) has released the NPCIL Scientific Assistant Recruitment notification for 45 vacancies.

-> Candidates can apply online start applying from 12 March 2025 till 1 April 2025.

-> NPCIL Exam Date 2025 is yet to be announced, candidates can keep a check on the official website for latest updates.

-> Candidates with diploma in Civil/Mechanical/Electrical/Electronics with a minimum of 60% marks are eligible to apply. 

Exams Tests Super Practice

More Effect on Shaft Questions

Q1.If torsional rigidity increases in the torsion equation, then the:
Q2.A beam of uniform rectangular cross - section is under a transverse load. The stress along the neutral axis of central cross - section is
Q3.Which of the following is an INCORRECT bending equation based on the theory of pure bending? where, M = Bending moment, I = Moment of inertia exerted on the bending axis, σ = stress of the fibre at a distance 'y' from neutral/centroidal axis, E = Young's Modulus of beam material, R = Curvature radius of this bent beam and Z = Section modulus of the section.
Q4.Which of the following is an INCORRECT bending equation based on the theory of pure bending? Where, M= Bending moment, I = Moment of inertia exerted on the bending axis, σ = Stress of the fibre at a distance 'y' from neutral/centroidal axis, E = Young's Modulus of beam material, R = Curvature radius of this bent beam and Z = Section modulus of the section.
Q5.Assertion (A): Circular tubes are more efficient than solid bars in resisting torsional loads. In a typical hollow tube, most of the material is near the outer boundary of the cross section where both the shear stresses and the moment arms are highest. If weight reduction and savings of material are important, it is advisable to use a circular tube. Reason (R): The shear stresses in a solid circular bar are maximum at the outer boundary of the cross-section and zero at the center. Therefore, most of the material in a solid shaft is stressed significantly below the maximum shear stress. Furthermore, the stresses near the center of the cross-section have a smaller moment arm for use in determining the torque.
Q6.According to pure bending theory, which of the following claims is factually incorrect?
Q7.If D and d are the outer and inner diameters, respectively of the hallow shaft, then maximum shear stress will be given by:
Q8.Calculate the torque which a shaft of 3 cm diameter can safely transmit, if the shear stress is 48 N/cm2.
Q9.The theory of pure bending can be expressed by ______?
Q10.Based on the governing equation for the theory of pure bending which of the following is valid

More Torsion of Shaft Questions

Q1.Which of the following represents the polar modulus of the hollow shaft? [ If Do = External diameter and Di = Internal diameter ]
Q2.If the external diameter of a hollow shaft is three times greater than its internal diameter, what is the ratio of its torque-carrying capacity compared to that of a solid shaft of identical material and the same outer diameter?
Q3.For a thin planar ring of radius ‘r’ mm and thickness ‘t’ mm, its radius of gyration about the polar axis in mm is:
Q4.Two shafts, A and B, are of the same material. If the diameter of A is thrice the diameter of B, then the torque that can be transmitted by A will be:
Q5.If torsional rigidity increases in the torsion equation, then the:
Q6.A rectangular bar of width b and height h is being used as a cantilever. The loading is in a plane parallel to the side b. The section modulus is
Q7.If a shaft rotates at 120 rpm under a torque of 1200 Nm, the power transmitted is:
Q8.A beam of uniform rectangular cross - section is under a transverse load. The stress along the neutral axis of central cross - section is
Q9.A solid shaft of 'D' mm diameter is used to transmit torque, if maximum shear stress induced to the shaft is 'τ' N/mm2, what will the maximum torque transmitted by the shaft? 
Q10.Calculate the minimum diameter of the shaft, such that the shearing stress does NOT exceed 50 N/mm2 during torque transmission of 15000 N-m.
Suggested Test Series
View All >
NPCIL Scientific Assistant Physics Mock Test
38 Total Tests with 1 Free Tests
Start Free Test
NPCIL Scientific Assistant Mechanical Mock Test
56 Total Tests with   1 Free Tests
Start Free Test

MAHA Metro Train Operator Important Links

Eligibility CriteriaSalary and Job ProfileAdmit CardSyllabus and Exam PatternAnswer KeyCut Off

More Strength of Materials Questions

Q1.What will be the nature of longitudinal stress in a thin closed cylinder containing hydrostatic fluid pressure?
Q2.A steel bar (E = 200E = 200, α = 12 × 10 − 6/°C) expands by 0.3 mm due to  a temperature increase. If the original length of the bar was 15 cm, what was the temperature rise?
Q3.In the Charpy impact test, the specimen is typically:
Q4.Which of the following represents the polar modulus of the hollow shaft? [ If Do = External diameter and Di = Internal diameter ]
Q5.A simply supported beam with a span length of 5 m carries a moment of 20 N-m (counterclockwise direction) at the middle of the beam. What will the value of reactions be at both the ends of the beam?
Q6.What will be the shape of the bending moment diagram for a cantilever beam carrying a uniformly distributed load throughout its length?
Q7.If a component has a Factor of Safety (FoS) of 1.0, what does it indicate?
Q8.If elastic strength increases 3 times, then Proof Resilience:
Q9.If the external diameter of a hollow shaft is three times greater than its internal diameter, what is the ratio of its torque-carrying capacity compared to that of a solid shaft of identical material and the same outer diameter?
Q10.For a thin planar ring of radius ‘r’ mm and thickness ‘t’ mm, its radius of gyration about the polar axis in mm is:
Testbook Edu Solutions Pvt. Ltd.
1st & 2nd Floor, Zion Building,
Plot No. 273, Sector 10, Kharghar,
Navi Mumbai - 410210
support@testbook.com
Toll Free:1800 833 0800
Office Hours: 10 AM to 7 PM (all 7 days)
Company
About usCareers We are hiringTeach Online on TestbookPartnersMediaSitemap
Products
Test SeriesTestbook PassOnline CoursesOnline VideosPracticeBlogRefer & EarnBooks
Copyright © 2014-2022 Testbook Edu Solutions Pvt. Ltd.: All rights reserved
User PolicyTermsPrivacy
Hot Links： teen patti master plus teen patti - 3patti cards game teen patti earning app