A. Stands for Light Amplification by Stimulated Emission of Radiation
B. Has the same intensity as visible light
C. Can’t be used for cutting metals
D. None of these
✅ The correct answer is option A.
Basic Chemical Engineering MCQs
Semi-conductors normally employ __________ bonding.
A. Co-ordinate
B. Ionic
C. Covalant
D. Metallic
✅ The correct answer is option C.
The usual energy consumption in electric arc furnace steel making is __________ KWh/ton of steel.
A. 60 – 100
B. 400 – 700
C. 1200 -1500
D. 2000 – 2300
✅ The correct answer is option B.
In chemical dehumidification process
A. Wet bulb temperature increases
B. Dry bulb temperature remains constant
C. Dew point temperature increases
D. Dry bulb temperature increases
✅ The correct answer is option B.
In the floatation process, pine oil is used as the
A. Collector
B. Activator
C. Frother
D. Depressant
✅ The correct answer is option C.
Pick out the wrong conversion of absolute & kinematic viscosities.
A. 1 stoke = 1 cm²/sec
B. 1 N.sec/m² = 10 paise
C. 1 stoke = 1 m²/sec
D. 1 m²/sec = 10⁴ stokes
✅ The correct answer is option C.
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.
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.
The refrigerant freon-12 is chemically
A. CCl₂F₂
B. CCl₃F
C. CClF₃
D. CCl₄F
✅ The correct answer is option A.
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.