801. Grinding wheels should be tested for balance
A. only at the time of manufacture
B. before starting the grinding operation
C. at the end of grinding operation
D. occasionally
802. Strain energy is the
A. energy stored in a body when strained within elastic limits
B. energy stored in a body when strained upto the breaking of a specimen
C. maximum strain energy which can be stored in a body
D. proof resilience per unit volume of a material
803. A vertical column has two moments of inertia (i.e. Ixx and Iyy ). The column will tend to buckle in the direction of the
A. axis of load
B. perpendicular to the axis of load
C. maximum moment of inertia
D. minimum moment of inertia
804. The neutral axis of the cross-section a beam is that axis at which the bending stress is
A. zero
B. minimum
C. maximum
D. infinity
805. Euler’s formula holds good only for
A. short columns
B. long columns
C. both short and long columns
D. weak columns
806. The object of caulking in a riveted joint is to make the joint
A. free from corrosion
B. stronger in tension
C. free from stresses
D. leak-proof
807. A steel bar of 5 mm is heated from 15° C to 40° C and it is free to expand. The bar Will induce
A. no stress
B. shear stress
C. tensile stress
D. compressive stress
808. A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum normal stress will be
A. 400 MPa
B. 500 MPa
C. 900 MPa
D. 1400 MPa
809. The stress induced in a body, when suddenly loaded, is __________ the stress induced when the same load is applied gradually.
A. equal to
B. one-half
C. twice
D. four times
810. A masonry dam may fail due to
A. tension in the masonry of the dam and its base
B. overturning of the dam
C. crushing of masonry at the base of the dam
D. any one of the above
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