Practice Test: Question Set - 26
1. The relation between modulus of elasticity (E) and modulus of rigidity (C) is given by
- (A) C = m.E/2 (m + 1)
- (B) C = 2(m + 1)/m.E
- (C) C = 2m.E/(m + 1)
- (D) C = (m
+ 1)/2m.E
2. The Rankine's constant for a mild steel column with both ends hinged is
- (A) 1/750
- (B) 1/1600
- (C) 1/7500
- (D) 1/9000
3. In a watch, the spring is used to store strain energy. This energy is released
- (A) To stop the
watch
- (B) To run the
watch
- (C) To change
the time
- (D) All of these
4. When a column is subjected to an eccentric load, the stress induced in the column will be
- (A) Direct
stress only
- (B) Bending
stress only
- (C) Shear stress
only
- (D) Direct and
bending stress both
5. Two shafts 'A' and 'B' are made of same material. The shaft 'A' is solid and has diameter D. The shaft 'B' is hollow with outer diameter D and inner diameter D/2. The strength of hollow shaft in torsion is _________ as that of solid shaft.
- (A) 1/16
- (B) 1/8
- (C) 1/4
- (D) 15/16
6. A thick cylindrical shell having r₀ and ri as outer and inner radii, is subjected to an internal pressure (p). The maximum tangential stress at the inner surface of the shell is
- (A) [p (r₀² + ri²)] / (r₀² - ri²)
- (B) [p (r₀² - ri²)] / (r₀² + ri²)
- (C) 2pri²/ (r₀² - ri²)
- (D) (r₀² - ri²) / 2pri²
7. A beam of uniform strength has
- (A) Same
cross-section throughout the beam
- (B) Same bending
stress at every section
- (C) Same bending
moment at every section
- (D) Same shear
stress at every section
8. When a circular bar tapering uniformly from diameter d₁, at one end to diameter d₂ at the other end, is subjected to an increase in temperature (t), then the thermal stress induced is (where α = Coefficient of linear expansion, and E = Modulus of elasticity for the bar material)
- (A) α.t.E.d₁/d₂
- (B) α.t.d₁/E.d₂
- (C) α.t.d₂/d₁.E
- (D) d₁.t/
α.E.d₂
9. A shaft of diameter D is subjected to a twisting moment (T) and a bending moment (M). If the maximum bending stress is equal to maximum shear stress developed, then M is equal to
- (A) T/2
- (B) T
- (C) 2T
- (D) 4T
10. The maximum deflection of a fixed beam of length ‘l’ carrying a total load ‘W’ uniformly distributed over the whole length is
- (A) Wl3/48EI
- (B) Wl3/96EI
- (C) Wl3/192EI
- (D) Wl3/384EI
11. Factor of safety is defined as the ratio of
- (A) Ultimate
stress to working stress
- (B) Working
stress to ultimate stress
- (C) Breaking
stress to ultimate stress
- (D) Ultimate
stress to breaking stress
12. A pressure vessel is said to be a thin shell when the ratio of wall thickness of the vessel to its diameter is __________ 1/10.
- (A) Equal to
- (B) Less than
- (C) Greater than
- (D) None
of these
13. The unit of stress in S.I. units is
- (A) N/mm²
- (B) kN/mm²
- (C) N/m²
- (D) Any one of
these
14. . A rod is enclosed centrally in a tube and the assembly is tightened by rigid washers. If the assembly is subjected to a compressive load, then
- (A) Rod is under
compression
- (B) Tube
is under compression
- (C) Both
rod and tube are under compression
- (D) Tube
is under tension and rod is under compression
15. The load required to produce a unit deflection in a spring is called
- (A) Flexural
rigidity
- (B) Torsional
rigidity
- (C) Spring
stiffness
- (D) Young's
modulus
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