Half life of a radioactive isotope corresponds to the time required for half of the _______________ to decay ?
A. Atoms
B. Neutrons
C. Nucleons
D. Electrons
Chemical Engineering Basics
Which of the following mainly decides the current to be employed is arc welding ?
Which of the following mainly decides the current to be employed is arc welding ?
A. Electrode size
B. Plate thickness
C. Voltage across the arc
D. Welded portion length
Main constituent of bone ash is____________________?
Main constituent of bone ash is____________________?
A. Ammonium phosphate
B. Calcium phosphate
C. Animal charcoal
D. Ammonium sulphate
Isotropic materials have the same _______________________ in all directions?
Isotropic materials have the same _______________________ in all directions?
A. Induced stresses
B. Density
C. Elastic properties
D. Thermal properties
Projection welding & stud welding is categorised as the _______________ welding?
Projection welding & stud welding is categorised as the _______________ welding?
A. Pressure
B. Thermit
C. Resistance
D. Arc
The following thermocouple may be used for measuring temperature upto 1873°K__________________?
The following thermocouple may be used for measuring temperature upto 1873°K__________________?
A. Chromel-alumel
B. Copper-constantan
C. Platinum-platinum rhodium
D. Iron-constantan
Drossing is a _______________________ operation?
Drossing is a _______________________ operation?
A. Smelting
B. Dressing
C. Roasting
D. Dressing
Lead pencil contains____________________?
Lead pencil contains____________________?
A. Graphite
B. Lead sulphide
C. Lead
D. Both B. & C.
Hot dipping process is used for coating a low melting point metal (e.g. Pb, Sn, Zn) on iron, steel & copper having relatively higher melting points. Which of the following is not a hot dipping process ?
Hot dipg process is used for coating a low melting point metal (e.g. Pb, Sn, Zn) on iron, steel & copper having relatively higher melting points. Which of the following is not a hot dipg process ?
A. Galvanising
B. Tinning
C. Sherardizing
D. None of these
The underground well of a bio gas plant is called the________________?
The underground well of a bio gas plant is called the________________?
A. Septic tank
B. Oxidation well
C. Digestor
D. Lagoon