Preliminary Exam: Multiple Choice

Concurrent vector forces act

• parallel to each other.

• through the same point.

• within the same time frame.

• along the same line of action.

Secondary bonds result from

• intermolecular dipole attraction

• sharing of electrons in the outer shell.

• an electron cloud or gas of valence electrons

• the loss or gain of an electron in the outer shell.

Polymeric structures may be defined as

• hard, tough, elastic, ductile.

• branched, linear, network or cross-linked.

• thermosetting. devitrified, repetitive amd ionic.

• thermosoftening, thermosetting, amorphous, conductors.

Identify the structure from those shown below that represents a steel beyond the eutectoid point (0.83% C)

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In the front view of a multi-view orthogonal drawing, a horizontal surface will appear as

• a point.

• an ellipse.

• a normal line.

• a foreshortened surface.

An object is propelled along a straight-line path by a force. If the net force was doubled, its acceleration would

• double.

• be halved.

• be quadrupled.

• stay the same.

The type of stainless steel formed is determined by the interplay between

• iron and nickel.

• iron and chromium.

• nickel and chromium.

• ferrite and austenite stabilising elements.

Calculate the strain in a 35 mm long, 1.2mm² wire with a Young's Modulus of 90 GPA when it is loaded to 50 N.

• 0.463 x 10^-3

• 0.016

• 41.67

• 42

Given that orthographic drawings are created in third angle projection, identify the correct top and front views of the isometric drawings shown below.

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Physical qualities determining mould material in casting operations is decided by

• mould material costs.

• component size and number of mould runners.

• heating method of cast material and mould cavity size.

• material casting temperatures and mould reusability requirements