1. What is the percentage of starch in maize kernels?
a) 15-30%
b) 60-65%
c) 70-85%
d) 40-50%
Explanation: Percentage of starch in maize kernels is 60-65%. Starch produced from maize kernels contains 15-30% amylose and 85-70% amylopectin. It is hydrolyzed by acids, alkalis, and enzymes. Starch can form gel on reaction with water under suitable conditions.
2. Starch suspension contains a water insoluble protein namely ____________
a) Thrombin
b) Myosin
c) Gluten
d) Albumin
Explanation: Starch suspension contains a water insoluble protein namely gluten which is separated in a two stage centrifuge operation. Starch is recovered as filter cake.
3. Which of the following statements are wrong?
a) Micro-organism cell wall rupture takes place under high shear stress
b) Escape velocity decreases with increase in tank size
c) Heat sterilization avoids contamination of pure cultures in fermenters
d) Rapid fermentation rates is a pre-requisite for successful fermentation process
Explanation: Escape velocity = V*v/A, where A is the unused gas escape area, V is total volume; v is the volume of air per unit volume of liquid per unit time. V varies as D3, A varies as D2. Hence escape velocity is linearly proportional to D, which means escape velocity increases with increase in tank size.
4. Which of the following is not a design principle for sterile operations?
a) Continued use of steam for labile zones
b) Dependent sterilization of each part of system
c) Usage of Kel-F diaphragm valves
d) All welded smooth inside construction
Explanation:Continued use of steam for labile zones, Usage of Kel-F diaphragm valves, all welded smooth inside construction, and we need to independently sterilize each part of system.
5.Percentage of alcohol in beer is ______
a) 8-10% alcohol
b) 95% alcohol
c) 10-15% alcohol
d) 50% alcohol
Explanation: 8-10% alcohol in fermented liquor is called beer. Azeotropic alcohol-water mixture contains 95% ethanol. 50-60% alcohol is taken from the beer still.
6. Bottoms from the beer still are known as _____________
a) Mash
b) Denatured spirits
c) Slops
d) Bagasse
Explanation: While top product from beer still is sent to aldehyde column, the bottoms known as slops are concentrated so that they can be used as cattle feed or can be discharged as waste.
7. Ethyl alcohol can be produced by oxidation of petroleum.
a) False
b) True
Explanation: Fermentation from sucrose substrate, catalytic hydration of ethylene, fermentation from starch substrate, oxidation of petroleum are some of the possible processes for manufacturing alcohol. Out of which only some are economical.
8.Which of the following operation is not involved in petroleum fermentation process?
a) Evaporation
b) Distillation
c) Leaching
d) Condensation
Explanation: Petroleum fermentation process involves separation, condensation, fermentation, evaporation, drying, leaching, and recovery.
9. Science of fermentation is called zymology.
a) True
b) False
Explanation:The statement is true as the science of fermentation is called zymology. It is a metabolic process and it is of 2 types: aerobic and anaerobic fermentation.
10. Which of the following statements are wrong?
a) Food preservation includes inert gas blanketing of goods
b) Mexico’s climate is suitable for aquaculture
c) Ham, bacon is pork products
d) In cyclic yield of milk, there are 6lean and 6 flush months
Explanation: Mexico’s climate is not suitable for aquaculture as it doesn’t provide right industrial climate. Ecuador in South America has the potential and reached its peak.