NDDB veterinary and executive posts · India · National Dairy Development Board
Original practice questions written to the published syllabus · not past papersNDDB veterinary and executive posts is a professional certification run by National Dairy Development Board, for candidates in India. There were no open veterinary posts when checked.
Official site: nddb.coop.
We have not been able to confirm these details against the exam body's own specification, so fees, dates and pass marks are left out on purpose. Check the current format, eligibility, fees and dates on the official site.
Milk composition and quality testing, adulteration, heat processing, indigenous and fermented dairy products, dairy standards, packaging and quality control.
Our 15 NDDB veterinary and executive posts questions in this subject: 0 easy, 9 medium, 6 hard, across 9 units.
Choose an answer, then open the working. Each explanation says why the right answer is right and why the others are not.
These 10 were written to NDDB veterinary and executive posts and are not shown on any other exam's page.
A collection centre finds samples with normal lactometer readings, high pH, frothing on shaking, and positive urea and detergent tests. What is the most likely problem?
A. Synthetic milk made from water, vegetable oil, detergent, urea and sugar
Detergent (to emulsify oil and froth), urea and sugar (to restore lactometer reading and SNF) and alkali are the signature of synthetic milk. Souring lowers pH; mastitis and colostrum do not give detergent or added urea.
In an HTST pasteuriser, raw milk enters regeneration at 5 degrees C and leaves it at 60 degrees C; pasteurisation temperature is 72 degrees C. What is the regeneration efficiency?
D. 82%
Efficiency = rise in regeneration / total rise = (60 - 5)/(72 - 5) x 100 = 55/67 = 82%. Dividing 55 by 72 gives 76% (ignores inlet temperature); 60/72 gives 83%; 18% is the heater's share.
A spray dryer receives 1000 kg of milk concentrate at 48% total solids and produces powder with 3.5% moisture. How much water is evaporated in the dryer?
C. About 503 kg
Powder = 480 kg solids / 0.965 = 497.4 kg; water removed = 1000 - 497.4 = 502.6 kg. 497 kg is the powder; 520 kg is all the water in the feed; 480 kg is the solids.
Fifty kilograms of butter with 80% fat are clarified to ghee of 99.5% fat, with 3% of the fat lost in the ghee residue. What is the ghee yield?
D. About 39.0 kg
Fat to ghee = 50 x 0.80 x 0.97 = 38.8 kg; ghee = 38.8/0.995 = 39.0 kg. 40.2 kg ignores the loss; 38.8 kg is the fat alone without dividing by 0.995; 48.5 kg applies the loss to butter weight.
Two hundred kilograms of 40% fat cream are churned to butter of 81% fat. Ignoring fat lost in buttermilk, what are the butter yield and the overrun?
C. 98.8 kg butter, 23.5% overrun
Fat = 80 kg; butter = 80/0.81 = 98.8 kg; overrun = (98.8 - 80)/80 x 100 = 23.5%. 19% divides by butter instead of fat; 64.8 kg multiplies fat by 0.81.
A plant recovers 7.0 kg of total solids in paneer curd from 100 kg of milk; the paneer has 55% moisture. What is the paneer yield?
B. 15.6 kg
Paneer = solids / solids fraction = 7.0/0.45 = 15.6 kg. 12.7 kg divides by the moisture fraction (0.55), the usual slip; 10.9 kg adds 55% of 7 kg; 3.9 kg multiplies 7.0 by 0.55.
A dairy's dahi set fails repeatedly in the same culture line while other lines set normally. What is the most likely cause?
C. Bacteriophage infection of the starter
Phage lysis of starter bacteria is the main cause of slow or failed acid production; culture rotation and plant hygiene control it. Fat level and milk species do not stop a set.
How is packaging material commonly sterilised in aseptic filling of UHT milk?
A. Hot hydrogen peroxide, then hot air to remove residues
Packaging web passes through hot hydrogen peroxide and is dried with hot sterile air, sometimes with UV. Irradiating filled packs or autoclaving the web is not the usual method.
Several UHT cartons from one batch are swollen and their contents curdled after a 7-day incubation test, while the process records show correct temperature. Where should the investigation start?
D. Package integrity and aseptic zone sterility at the filler
Correct heat treatment points to recontamination after heating: leaking seals, damaged packs or a breach in filler sterility. Phosphatase in raw milk is irrelevant to UHT spoilage.
A pasteurised milk line shows rising counts each week despite a normal CIP report. Swabs are clean on straight pipes but positive at a T-piece leading to a closed valve. What is the likely cause and fix?
D. A dead leg harbouring biofilm; remove or redesign it so CIP flows through
Dead legs are not reached by turbulent CIP flow and harbour biofilm that seeds the product. Raising acid or heat does not reach the dead leg.
This plan follows where our questions actually fall, so the time goes where the marks are likely to be. It is our reading of the syllabus, not the exam body's weighting.
Read the manual chapters for these first and do every worked question you can find on them.
Aim for one sitting per unit, then mixed questions across them.
Learn the definitions, classifications and standard numbers; these units are more often recalled than worked.
Come back to these after a first pass, untimed, and read every explanation, including for the options you rejected.
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