Related Questions

When a shaft is subjected to combined twisting moment (T) and bending moment (M), then the equivalent twisting moment is equal to
ক $$\frac{1}{2}\sqrt {{{\text{M}}^2} + {{\text{T}}^2}} $$
খ $$\sqrt {{{\text{M}}^2} + {{\text{T}}^2}} $$
গ $$\frac{1}{2}\left( {{\text{M}} + \sqrt {{{\text{M}}^2} + {{\text{T}}^2}} } \right)$$
ঘ $${\text{M}} + \sqrt {{{\text{M}}^2} + {{\text{T}}^2}} $$
When a shaft is subjected to a twisting moment, every cross-section of the shaft will be under
ক Tensile stress
খ Compressive stress
গ Shear stress
ঘ Bending stress
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
ক $$\frac{{\text{T}}}{2}$$
খ T
গ 2T
ঘ 4T
If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value?
ক Maximum principal stress theory
খ Maximum shear stress theory
গ Maximum strain energy theory
ঘ Maximum distortion energy theory
A shaft is subjected to bending moment M and a torque T simultaneously. The ratio of the maximum bending stress to maximum shear stress developed in the shaft, is
ক $$\frac{{\text{M}}}{{\text{T}}}$$
খ $$\frac{{\text{T}}}{{\text{M}}}$$
গ $$\frac{{2{\text{M}}}}{{\text{T}}}$$
ঘ $$\frac{{2{\text{T}}}}{{\text{M}}}$$
The safe twisting moment for a compound shaft is equal to the
ক Maximum calculated value
খ Minimum calculated value
গ Mean value
ঘ Extreme value
The design stress, which is more than the damaging stress, is the least unit stress that will render a member unfit for service before the end of its normal life. The design stress factor or factor of safety indicates the margin between design stress and the __________ stress.
ক Working
খ Damaging
গ Allowable
ঘ None of these
Two beams, one of circular cross-section and the other of square cross-section, have equal areas of cross-sections. When these beams are subjected to bending,
ক Both beams are equally economical
খ Square beam is more economical
গ Circular beam is more economical
ঘ None of these
‘P’ is the pre-stressed force applied to tendon of a rectangular pre-stressed beam whose area of cross section is ‘A’ and sectional modulus is ‘Z’. The minimum stress ‘f’ on the beam subjected to a maximum bending moment ‘M’ is
ক $${\text{f}} = \frac{{\text{P}}}{{\text{A}}} - \frac{{\text{Z}}}{{\text{M}}}$$
খ $${\text{f}} = \frac{{\text{A}}}{{\text{P}}} - \frac{{\text{M}}}{{\text{Z}}}$$
গ $${\text{f}} = \frac{{\text{P}}}{{\text{A}}} - \frac{{\text{M}}}{{\text{Z}}}$$
ঘ $${\text{f}} = \frac{{\text{P}}}{{\text{A}}} - \frac{{\text{M}}}{{6{\text{Z}}}}$$
‘P’ is the pre-stressed force applied to the tendon of a rectangular pre-stressed beam whose area of cross section is ‘A’ and sectional modulus is ‘Z’. The maximum stress ‘f’ in the beam, subjected to a maximum bending moment ‘M’, is
ক $${\text{f}} = \frac{{\text{P}}}{{\text{A}}} - \frac{{\text{Z}}}{{\text{M}}}$$
খ $${\text{f}} = \frac{{\text{A}}}{{\text{P}}} - \frac{{\text{M}}}{{\text{Z}}}$$
গ $${\text{f}} = \frac{{\text{P}}}{{\text{A}}} - \frac{{\text{M}}}{{\text{Z}}}$$
ঘ $${\text{f}} = \frac{{\text{P}}}{{\text{A}}} - \frac{{\text{M}}}{{6{\text{Z}}}}$$

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