Target GATE & ESE 2022 (Fluid Mechanics)

 Q.1 If the velocity of flow as well as the diameter of the flowing pipe are respectively doubled through a pipe system in use since long, the head loss will thereafter be

(a) Halved    (b) Doubled          (c) Increased 4 times       (d) No change

Q.2 Two tanks are connected in parallel by two pipes A and B of identical friction factors and lengths. If the size of pipe A is double that of pipe B, then their discharges will be in the ratio of

(a) 2           (b) 4     (c) 5.66           (d) 32

Q.3 In steady flow of a compressible fluid through a pipe, the density, area and velocity at a particular section are 1.5 kg/m^3, 0.5 m^2 and 3 m/s, respectively. At another section the density and area are 0.75 kg/m^3 and 1.0 m^2 respectively. What is the velocity at this section?

(a) 1.5 m/s          (b) 3.0 m/s           (c) 4.5 m/s          (d) 6.0 m/s

Q.4 A pipe network consist of a pipe of 60 cm diameter and branches out at a point F into two branches, one of 30 cm diameter and the other of 45 cm diameter. These branch pipes rejoin at a point B. The velocity in the first branch (of 45 cm diameter) is 1.5 m/s. Which one of the following statements is true?

(a) The velocity in second branch is 1.0 m/s

(b)  The velocity in second branch is 2.25 m/s

(c) The velocity in second branch is 0.667 m/s

(d) The potential drop between F and B in both branches is same

Q.5 A compound pipe (new cast iron) system consists of pipes of length 1800 m and diameter 50 cm, length 1200 m and diameter 40 cm and length 600 m and diameter 30 cm connected in series. The equivalent length of 40 cm diameter pipe will be nearly

(a) 4300 m                   (b) 4400        (c) 4500 m               (d) 3600  

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