A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used ?

Related Mcqs:

1. A model of a reservior is drained in 4 mts by opening the sluice gate. The model scale is 1: 225. How long should it take to empty the prototype ?

   A. 900 minutes
   B. 4 minutes
   C. 4 x (225)3/2 minutes
   D. 4 (225)1/3 minutes
   E. 4 x V225 minutes

2. The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is____________________?

   A. 100 cm
   B. 110 cm
   C. 120 cm
   D. 150 cm

3. The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is____________________?

   A. 30 minutes
   B. 1 hour
   C. 1 hour and 30 minutes
   D. 2 hours

4. For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is__________________?

   A. 16 m
   B. 20 m
   C. 24 m
   D. 30 m

5. A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water ?

   A. 10 m/sec
   B. 25 m/sec
   C. 2 m/sec
   D. 50 m/sec
   E. 250 m/sec

6. Maximum permissible velocity 1.5 m/sec, is adopted in drains_______________________?

   A. With beds of rocks and gravels
   B. Lined with stones
   C. Both A. and B.
   D. Neither A. nor B.

7. For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is____________________?

   A. Cast iron sewers
   B. Cement concrete sewers
   C. Glazed bricks sewers
   D. Stone ware sewers

8. If is the rugosity coefficient, is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = (1/n) r2/3 s1/2 evolved by_________________?

   A. Chezy
   B. Manning
   C. Bazin
   D. Kutter

9. For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is________________?

   A. 10 cm
   B. 12 cm
   C. 15 cm
   D. 18 cm

10. The velocity of jet of water travelling out of opening in a tank filled with water is proportional to___________________?

    A. head of water (h)
    B. h2
    C. V/T
    D. h2
    E. h3/1.