Basic Chemical Engineering MCQs

Practice Basic Chemical Engineering MCQs with answers and explanations to prepare for exams, interviews, and job tests. Our question bank covers fundamental topics such as units and dimensions, material and energy balances, fluid mechanics, thermodynamics, heat transfer, mass transfer, and chemical process basics. These multiple-choice questions are designed for students, fresh graduates, and competitive exam aspirants preparing for NTS, PPSC, FPSC, PEC exams, GATE, university entry tests, and recruitment assessments. Strengthen your core concepts and problem-solving skills with our updated Basic Chemical Engineering MCQs.

51. An orthotropic material is a special class of anisotropic material, which is described by their properties in three perpendicular directions. An example of orthotropic material is

A. Stainless steel

B. Cast iron

C. Wood

D. Teflon

✅ The correct answer is option C.

52. Draught produced by a tall chimney due to density difference between hot flue gas inside the Chimney and atmospheric air outside the chimney is more appropriately known as the __________ draught.

A. Natural

B. Induced

C. Forced

D. Chimney

✅ The correct answer is option A.

53. The refrigerant freon-12 is chemically

A. CCl₂F₂

B. CCl₃F

C. CClF₃

D. CCl₄F

✅ The correct answer is option A.

54. The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron?

A. 159

B. 1837

C. 2537

D. 10000

✅ The correct answer is option C.

55. If the pH value of a solution of sodium chloride is 7; then what will be the pH value of the solution after its electrolysis ?

A. 7

B. < 7

C. > 7

D. 0

✅ The correct answer is option C.

56. Thermistors are used in __________ devices.

A. Voltage measuring

B. Temperature measuring

C. Temperature compensating

D. Both B & C

✅ The correct answer is option D.

57. In a titration involving weak acid and strong base, the preferred indicator is

A. Methyl orange

B. Phenolphthalein

C. Ethyl orange

D. Fehling’s solution

✅ The correct answer is option B.

58. Joining of thin foils is preferred to be done by

A. Gamma rays

B. X-rays

C. Microwaves

D. Gas welding

✅ The correct answer is option C.

59. Hot working of lead is carried out at

A. 75°C

B. 373°K

C. 150°C

D. Room temperature

✅ The correct answer is option B.

60. The mechanism which changes the value of manipulated variable in response to the output signal from the control unit is called the

A. Final control element

B. On-off control

C. Floating control action

D. None of these

✅ The correct answer is option A.