Strength of Materials (Stresses and Strains)

Q.1.      A bar of diameter 30 mm is subjected to a tensile load such that the measured extension on a gauge length of 200 mm is 0.09 mm and the change in diameter is 0.0045 mm. The Poisson’s ratio will be
            (a)  1/4
            (b)  1/3
            (c)  1/4.5
            (d)  1/2                            (IES 1995)

Q.2.     A steel cube of volume 8000 cc is subjected to all round stress of 1330 kg/sq.cm. The volumetric change is

            (a)  8 cc
            (b)  6 cc
            (c)  0.8 cc
            (d)  0.01 cc                     (IES 1995)

Q.3.      A steel tube is surrounding a solid aluminium cylinder. A force P is applied at the assembly. The aluminium cylinder is 75 mm in diameter and outside diameter of the steel tube is 90 mm. Given Esteel = 200 GNm-2 and Ealuminium =25 GNm-2 If P = 200 kN, the stress in steel tube will be
            (a)  10 MPa
            (b)  60.75 MPa
            (c)  80.25 MPa
            (d)  100 MPa

Q.4.      In the above problem, stress in aluminium will be
             (a)  10 Mpa
             (b)  60.75 MPa
             (c)  80.25 MPa
             (d)  100 MPa

Q.5.      A bar of length L is fitted between two supports and the temperature is increased t0. If support does not yield, the temperature stress in the bar will be
            (a)  0
            (b)  tE
            (c)  at
            (d)  atE

Q.6.      The length, coefficient of thermal expansion and Young’s modulus of bar A are twice that of bar B. If the temperature of both bars is increased by the same amount while preventing any expansion, then the ratio of stress developed in bar A to that in bar B will be
            (a)  2
            (b)  4
            (c)  8
            (d)  16                             (IES 1996)

Q.7.      A steel bar, 300 mm long and 24 mm diameter, is turned down to 18 mm diameter for one third of its length. It is heated 300C above room temperature, clamped at both ends and then allowed to cool to room temperature. If the distance between the clamped is unchanged, the maximum stress in the bar(a = 12.5 x 10-6 per 0C and E = 200 GN/m2) is
            (a)  25 MN/m2
            (b)  50 MN/m2
            (c)  75 MN/m2
            (d)  100 MN/m2            (IES 2000)

Q.8.      A railway track is laid so that there is no stress in the rails at 100C. If there is no allowance for expansion then stress in the rails at 600 C will be
            (a)  53.3 N/mm2
            (b)  110.7 N/mm2
            (c)  115 N/mm2
            (d)  120 N/mm2

Q.9.      In the above problem if there is an expansion allowance of 10 mm per rail then stress in the rails at 600 will be
            (a)  53.3 N/mm2
            (b)  110.7 N/mm2
            (c)  115 N/mm2
            (d)  120 N/mm2

Q.10.      In the above problem what will be expansion allowance if stress induced is zero
             (a)  1 mm
             (b)  7 mm
             (c)  11 mm
             (d)  18 mm


Answers:

1. b
2. a
3. c
4. a
5. d
6. b
7. d
8. d
9. a
10. d

Popular posts from this blog

Meaning of AeSI withdrawing case from Delhi High Court and its implications for IEI

Image
There is breaking news - AeSI withdraws case from Delhi High Court on 27-05-2022. Does it mean that Aeronautical Society of India (AeSI)  is no more interested in conducting Section A and B exams and will only give membership? At first glance, it looks so. Fortunately, this conclusion is not true. To understand this let us go back to the past, just nine months back.  But first, let us understand what the problem is. The MHRD - AICTE in 2013 (and beyond), derecognised the equivalence criteria between engineering professional bodies (IEI, AeSI, IETE, IME, ICE and more such professional bodies) - Section A and Section B passed candidates, with that of B. Tech degree from an Indian University. In 2018, fresh admission was on hold as per the order given by Delhi High Court. Now, back to our story, AeSI came up with a better plan -  AeSI signed an MoU with Hindustan Institute of Technology & Science, Chennai (HITS)  in 2021. According to this MoU, students of Aeronautical Society who
Read more

AMIE aspirants are at crossroads—whether to continue/discontinue AMIE in the present scenario?

Image
  A lot of AMIE aspirants are at cross roads—whether to continue/discontinue AMIE in present scenario when fresh AMIE admissions and re-registration are suspended till further orders. The case is being fought in Delhi High Court and nobody knows the outcome. The social media is full of rumours which are void of substance. Under such a backdrop, a million-pound question is—should an AMIE aspirant, who is eligible to continue his AMIE, should stop or appear in whatever semesters left. Remember, stopping doing AMIE now may lead to loss of money and your hard core efforts. AMIE is still the cheapest option with so many advantages . You might have to spend many times more money joining AMIE in new protocol and with number of subjects almost double and practicals as many as 40! In our opinion, they must continue with it and try to finish their AMIE at the earliest. There is no harm in doing so as it is the lowest cost option for working aspirants. It would work as a fixed deposit—will benef
Read more

72 posts of Junior Draftsman in Punjab Subordinate Selection Service Board (PSSSB)

Department: Punjab Subordinate Selection Service Board (PSSSB) Post: Junior Draftsman (Civil/Electrical/Mechanical) Number of posts: 72 Eligibility: ITI in relevant trade or Diploma or Degree in Civil/Electrical/ Mechanical Engineering Last Date: 08-07-2022 (Extended) Written Test: Yes Download notification Application Form Extended Study Material & free samples for Junior Engineer Level Exams --- The study material for AMIE/B Tech/Junior Engineer exams is available at https://amiestudycircle.com
Read more