Use of water having dissolved oxygen in boilers promotes___________________?
A. Corrosion
B. Sequestration
C. Scale formation
D. None of these
Month: February 2019
Reaction of ethylene glycol and dimethyl terephthalate (DMT) produces ________________?
Reaction of ethylene glycol and dimethyl terephthalate (DMT) produces ________________?
A. Nylon-6
B. Dacron
C. Polyester
D. PVC
Sudden temperature fluctuation does not affect pyrex glass, because of its __________________?
Sudden temperature fluctuation does not affect pyrex glass, because of its __________________?
A. Low co-efficient of expansion
B. High co-efficient of expansion
C. High melting point
D. Both B. and (C)
Which of the following is a constituent of coffee ?
Which of the following is a constituent of coffee ?
A. Caffeine
B. Nicotine
C. Calgon
D. Lignin
Dacron (or Terylene) fibres as compared to nylon fibres have__________________?
Dacron (or Terylene) fibres as compared to nylon fibres have__________________?
A. Better heat & acid resistant properties
B. Poorer resistance to alkalis
C. Poorer dyeability
D. All A , B. and C.
Common salt is generally not produced commonly by ________________ method from brine ?
Common salt is generally not produced commonly by ________________ method from brine ?
A. Freeze drying
B. Electrolytic
C. Solar evaporation
D. Vacuum evaporation
Flash point of most vegetable oils is about _______________ °C ?
Flash point of most vegetable oils is about _______________ °C ?
A. 50
B. 100
C. 200
D. 300
Most widely and commonly used coagulant for the removal of suspended impurities in water is __________________?
Most widely and commonly used coagulant for the removal of suspended impurities in water is __________________?
A. Bleaching powder
B. Slaked lime
C. Alum
D. Copper sulphate
The major constituent of black liquor generated during paper manufacture is sodium___________________?
The major constituent of black liquor generated during paper manufacture is sodium___________________?
A. Sulphate
B. Carbonate
C. Hydroxide
D. Bi-carbonate
Paper grade bamboo contains about _______________ percent cellulose ?
Paper grade bamboo contains about _______________ percent cellulose ?
A. 5
B. 20
C. 40
D. 60