Chemical Engineering Basics MCQs

Question 1

Internal cracks in drawn bars are due to

Accepted Answer

Secondary tensile stresses

Answer

Temperature gradient in the work piece

Answer

Heated dies and grips

Answer

Internal compressive residual stress

Question 2

RADAR is

Accepted Answer

All of the above

Answer

Acronym for Radio Detection and Ranging

Answer

Name of technique for locating distant objects

Answer

Name of instrument for locating distant objects

Question 3

All modes of heat transfer i.e., conduction, convection & radiation occur in case of the

Accepted Answer

Boiler furnace

Answer

Condensation of steam in a partial condenser

Answer

Insulated pipe car raying high pressure steam

Answer

None of these

Question 4

Usual value of the resistance suitable for a wire resistance strain gauge is __________ ohms.

Accepted Answer

120

Answer

20

Answer

80

Answer

500

Question 5

An "orange peel" effect is observed

Accepted Answer

During deep drawing of metallic sheet having large grain size

Answer

As a defect during metal casting/ welding

Answer

During faulty heat treatment of steel

Answer

During extrusion of metal through a die

Question 6

Pick out the wrong statement.

Accepted Answer

Mild steel sheet can not be spot welded

Answer

Seam welding, projection welding & spot welding are the classification of electrical resistance welding

Answer

Electrode tip in spot welding is of copper and the tip diameter should be equal to t (where, t = plate thickness to be welded)

Answer

In spot welding, two pieces to be joined are overlapped and placed between two electrodes

Question 7

The tensile strength of plastics ranges from __________ kg/mm2.

Accepted Answer

0.1 to 10

Answer

10 to 50

Answer

50 to 100

Answer

0.01 to 0.1

Question 8

Cobalt-60 is used as a source of __________ in medical therapy & industrial radiography.

Accepted Answer

$$\gamma $$-rays

Answer

X-rays

Answer

$$\alpha $$-rays

Answer

$$\beta $$-rays

Question 9

Device used as a standard for the calibration of pressure gauges is a

Accepted Answer

Dead weight pressure tester

Answer

Bellow

Answer

Diaphragm

Answer

Mercury manometer