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Home Microbiology Wine and Beer Comments

  • Question
  • If the mash in the brewhouse is held too long it may undergo


  • Options
  • A. butyric acid fermentation
  • B. lactic acid fermentation
  • C. both (a) and (b)
  • D. citric acid fermentation

  • Correct Answer
  • both (a) and (b) 


  • Wine and Beer problems


    Search Results


    • 1. Most important species of vinegar bacteria causing sliminess is

    • Options
    • A. Acetobacter aceti
    • B. Saccharomyces carlsbergiensis
    • C. Lactobacillus lactis
    • D. None of the above
    • Discuss
    • 2. The potential spoilage organism in beer is

    • Options
    • A. Saccharomyces diastaticus
    • B. S. carlsbergensis
    • C. S. cerevisiae
    • D. S. lactis
    • Discuss
    • 3. The Sarcina sickness of beer, caused by Pedicoccus cerevisiae, is characterized by

    • Options
    • A. sourness
    • B. turbidity
    • C. popiness
    • D. all of these
    • Discuss
    • 4. Which of the following beer is of Japanese origin with an alcohol content of 14 to 17%?

    • Options
    • A. Sake
    • B. Pulpue
    • C. Sonti
    • D. Lager
    • Discuss
    • 5. Parsnip like odour and taste in beer is caused by

    • Options
    • A. Flavobacterium proteus
    • B. Zygomonas anaeroium
    • C. Lactobacillus patorianus
    • D. S. carlsbergensis
    • Discuss
    • 6. Which of the following is not an ale type of beer?

    • Options
    • A. Weiss beer
    • B. Porterr
    • C. Stout
    • D. Pilsener
    • Discuss
    • 7. Acetic acid bacteria spoiling musts and wines are inhibited by

    • Options
    • A. 5-7% alcohol by volume
    • B. 14-15% alcohol by volume
    • C. 24-25% alcohol by volume
    • D. 30-35% alcohol by volume
    • Discuss
    • 8. The spoilage most commonly occurring in wine is tourne which refers to

    • Options
    • A. acid formation from aldehyde and ketones
    • B. acid formation from sugars, glucose and fructose
    • C. both (a) and (b)
    • D. none of the above
    • Discuss
    • 9. Mined salt has been reported to contain about

    • Options
    • A. 50% Micrococcus, 10% Coryneforms and 14% Bacillus
    • B. 60% Micrococcus, 20% Coryneforms and 14% Bacillus
    • C. 70% Micrococcus, 20% Coryneforms and 4% Bacillus
    • D. 70% Micrococcus, 20% Coryneforms and 10% Bacillus
    • Discuss
    • 10. The manufacture of baker's yeast involve

    • Options
    • A. S. cerevisiae
    • B. S. thermophillus
    • C. Bacillus subtilis
    • D. none of these
    • Discuss


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