10 Questions
What is the primary function of a towing tank in the calibration of current meters?
To move a carriage longitudinally over its surface at constant speed to determine the average value of revolutions per second of the instruments.
What is the purpose of sounding weights in current meter measurement?
To enable the current meter to be positioned in a stable manner at the required location in flowing water.
What is the formula used to estimate the minimum weight of a sounding weight?
W = minimum weight in N, where W = v^2 * d.
What is the principle of the float method for measuring velocity?
The floating object on the surface of a stream is timed to yield the surface velocity by the relation S = distance travelled in time t.
What is the advantage of using a towing tank for calibration of current meters?
It allows for the calibration of current meters over the complete range of velocities and enables a best-fit linear relation to be obtained.
What is the purpose of mounting the instrument to be calibrated on the carriage in a towing tank?
To immerse the rotating element to a specified depth in the water body and measure the corresponding average value of revolutions per second.
What is the significance of the calibration equation obtained from a towing tank experiment?
It provides a best-fit linear relation between the velocity and the revolutions per second of the instrument.
What are the two institutions in India that have excellent towing-tank facilities for calibration of current meters?
The Central Water and Power Research Station, Pune and the Indian Institute of Technology, Madras.
What is the primary requirement for the carriage in a towing tank experiment?
It must be able to move at a predetermined constant speed (v) over the surface of the water.
What is the relation between the distance travelled and the time in the float method?
S = distance travelled in time t.
This quiz covers the experimental setup and procedure of a towing tank to calibrate an instrument. It involves measuring the revolutions per second of the instrument at a specified depth in the water body while moving at a constant speed. The experiment is repeated to determine the average value of revolutions per second.
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