Chapter 4 · MCQ Read Mode

Engineering Mechanics and Strength of Material

The principle of transmissibility of forces is applicable to:

Lami's theorem applies to:

The moment of a couple about any point in its plane is:

A hinged (pin) support in a 2-D structure provides:

Two forces of 3 N and 4 N act at right angles. Their resultant is:

The angle of repose is equal to:

The force of friction between two dry surfaces is:

D'Alembert's principle converts a dynamic problem into:

The maximum horizontal range of a projectile is obtained when it is projected at:

The work-energy theorem states that the net work done on a body equals the change in its:

A ball dropped from 4 m rebounds to 1 m. The coefficient of restitution is:

In a perfectly plastic collision, the coefficient of restitution is:

The tension ratio of a flat belt about to slip on a pulley is given by:

As the included angle between two sling legs lifting a load increases, the tension in each sling:

Hooke's law is valid up to the:

A steel bar 2 m long, area 100 mm², carries 20 kN. With E = 200 GPa, the elongation is:

The elongation of a bar hanging under its own weight W is:

A bar is fully restrained and heated by ΔT. The thermal stress is:

The theoretical maximum value of Poisson's ratio for an isotropic material is:

The relation between E, G and μ is:

If E = 200 GPa and μ = 0.25, the modulus of rigidity G is:

Volumetric strain of a rectangular bar subjected to axial load P is:

For a material with Poisson's ratio 0.5, the bulk modulus is:

The strain energy stored in a bar under axial load P is:

The maximum stress due to a suddenly applied load compared to the same load applied gradually is:

Modulus of resilience is:

A load applied suddenly (but without impact velocity) produces a stress approximately:

The factor of safety used for lifting equipment such as chains and slings is usually:

The centroid of a triangle of height h lies at a distance from its base of:

The centroid of a semicircular area of radius r from its diameter is:

The moment of inertia of a rectangle b × d about its base is:

The polar moment of inertia of a solid circular shaft of diameter d is:

Bending moment in a beam is maximum where the shear force:

A simply supported beam of span L carries a UDL w. The maximum bending moment is:

A cantilever of length L carries a point load W at the free end. The maximum deflection is:

The maximum deflection of a simply supported beam with a central point load W is:

For a rectangular beam section, the maximum shear stress is:

A plane truss with j joints is perfect if the number of members m is:

The maximum shear stress in a solid shaft of diameter d transmitting torque T is:

A shaft subjected to bending moment M and torque T has an equivalent torque of:

A shaft transmitting 15 kW at 300 rpm carries a torque of about:

The load capacity of a pallet-rack beam is often limited not by stress but by:

Which of the following is a higher pair?

A kinematic chain becomes a mechanism when:

According to Kutzbach's criterion, a planar linkage with 4 links and 4 binary lower pairs has DOF:

A planar linkage has 5 links and 6 binary joints. Its degree of freedom is:

Grashof's law for a four-bar chain having at least one fully rotating link is:

The Whitworth quick-return mechanism is an inversion of the single slider-crank chain obtained by fixing the:

An elliptical trammel is an inversion of the:

The number of instantaneous centres in a six-link mechanism is:

Kennedy's theorem states that the three instantaneous centres of three bodies in relative motion:

The Coriolis component of acceleration is present in:

Oldham's coupling is used to connect two shafts that are:

The Ackermann steering gear is preferred over the Davis steering gear because it:

The mechanism that gives a very large mechanical advantage near the end of its stroke, used in presses and clamping devices, is the:

The quick-return motion of a shaper is obtained from a:

The gyroscopic couple on a body spinning with angular velocity ω and precessing with ωp is:

A ship's rolling motion produces:

The function of a governor is to:

A governor is said to be isochronous when:

The height of a Watt governor running at 60 rpm is approximately:

The maximum fluctuation of energy in a flywheel is:

For complete dynamic balancing of several rotating masses in different planes:

The frequency of the secondary unbalanced force of a reciprocating engine is:

For high-speed cams, the preferred follower motion is:

In a cross-belt drive, the driven pulley rotates:

Power transmitted by a belt is maximum when centrifugal tension equals:

A gear train in which the first and last gears are on the same axis is a:

The standard pressure angle of modern involute gears is:

A flywheel is fitted to a punching press mainly to:

A worm gear reducer used for continuous duty is often avoided in energy-saving projects because:

On principal planes, the shear stress is:

The maximum shear stress planes are inclined to the principal planes at:

For σx = 80 MPa, σy = 20 MPa and τxy = 40 MPa, the maximum principal stress is:

In a state of pure shear τ, the principal stresses are:

The theory of failure most suitable for brittle materials is:

According to the von Mises (distortion energy) theory, the shear yield strength is:

Which of the following is statically indeterminate?

The effective length of a column with both ends fixed (actual length L) is:

In a thin cylindrical shell under internal pressure, hoop stress is:

A cylinder is treated as thin when its wall thickness is less than about:

In a thick cylinder under internal pressure, the maximum hoop stress occurs at the:

For a rectangular shaft under torsion, the maximum shear stress occurs at the:

In a thin cylindrical pressure vessel, the hoop stress is:

Replacing an open channel section of a machine frame by a closed box section mainly improves its: