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# BARC Subject Revision Quiz 1

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Question 1

A large hydraulic turbine is to generate 300 kW at 1000 rpm under a head of 40 m. for initial testing, a 1:4 scale model of the turbine operates under a head of 10 m. the power generated by the model (in kW) will be

Question 2

Consider an incompressible laminar boundary layer flow over a flat plate of length L, aligned with the direction of an oncoming uniform free stream. If F is the ratio of the drag force on the front half of the plate to the drag force on the rear half, then

Question 3

An experiment is carried on, in which time of rolling for the ball cut in half is to be calculated. The ball is rolling about its bottom point. The centre of gravity is at 2 cm and centre of buoyancy is at 4 cm. (Take radius of gyration, k = 4 m & g = 10 m/s ).

Question 4

For steady flow of a viscous incompressible fluid through a circular pipe of constant diameter, the average velocity in the fully developed region is constant. Which one of the following statements about the average velocity in the developing region is TRUE?

Question 5

An air stream is flowing over a flat plate with a velocity of 8 m/s. If the displacement is minute of just 0.5mm, determine the loss in flow rate. Take ρair = 1.2 kg/m3

Question 6

Two thin concentric tubes are placed on over surface of water such that water rises due to capillary action. The outer and inner tube radii are 6.3 cm and 6 cm. If the surface tension of water is 0.074N/m and angle of contact is zero, the capillary rise (in mm) between the gap of concentric tubes will be

Question 7

The intensity of rainfall and time interval of typical storm are

The maximum intensity of rainfall for 20 minutes duration of the storm is

Question 8

The consumptive use of water for a crop during a particular stage of growth is 2.0mm / day. The maximum depth of available water is the root zone is 60mm. Irrigation is required when the amount of available water is 50% of the maximum available water in the root zone. Frequency of irrigation should be

Question 9

Irrigation water is to be provided to a crop in a field to bring the moisture content of the soil from the existing 18% to the field capacity of the soil at 28%. The effective root zone of the crop is 70 cm. If the densities of the soil and water are 1.3 g/cm3 and 1.0 g/cm3 respectively, the depth of irrigation water (in mm) required for irrigating the crop is ________

Question 10

A stable channel is to be designed for a discharge of Q m3/s with silt factor f as per Lacey’s method. The mean flow velocity (m/s) in the channel is obtained by
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