**821. For laminar flow of Newtonian fluids through a circular pipe, for a given pressure drop and length & diameter of pipe, the velocity of fluid is proportional to (where, μ = fluid viscosity ) ?**

A. μ

B. 1/μ

C. √μ

D. 1/√μ

**822. Pumping of a corrosive liquid is generally preferred to be done by a ______________ pump, as it can be made of a variety of materials including plastics?**

A. Piston**B. Gear**

C. Positive displacement

D. Sump

**823. The line traced by a single fluid particle as it moves over a period of time is called ______________ line?**

A. Stream**B. Path**

C. Equipotential

D. None of these

**824. Pressure drop in a packed bed for laminar flow is given by the ______________ equation?****A. Kozeny-Carman**

B. Blake-Plummer

C. Leva’s

D. Fanning friction factor

**825. Which of the following is used for pumping crude oil from oil well ?**

A. Single stage centrifugal pump

B. Gear pump

C. Screw pump**D. Duplex/triplex reciprocating pump**

**826. Hydraulic diameter for non-circular ducts is equal to ___________ times the area of flow divided by the perimeter?**

A. Two

B. Three**C. Four**

D. Eight

**828. A hydraulic press has a ram of 10 cms in diameter and a plunger of 1 cm in diameter. The force required on the plunger to raise a weight of 10 tons on the ram is _____________ kg?****A. 10**

B. 100

C. 1000

D. 10000

**829. A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 1000 litres/minutes. If its speed is halved, the power consumed now will be _____________ hp?****A. 0.5**

B. 2

C. 4

D. 1

**830. A rectangular surface 3′ × 4′, has the lower 3 edge horizontal and 6′ below a free oil surface (sp. gr. 0.8). The surface inclination is 300 with the horizontal. The force on one side of the surface is (where, y = specific weight of water) ?**

A. 39.6y**B. 48y**

C. 49.2y

D. 58y

**NOTEIF YOU THINK ANY OF THE MCQ ABOVE IS WRONG.PLEASE COMMENT WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION IN COMMENT BOX.THANK YOU**