Civil UPSC ESE Exam Solution 2021
UPSC ESE Exam Solution 2021 for Civil Engineering UPSC ESE 2021 GS Paper 1 download exam paper from telegram https://telegram.me/civil_experiences
A full load is supplied by the turbine shaft when the diameter of the jet issuing from the nozzle is 150 mm. If the load suddenly drops to 36% of the full load, what diameter of the jet should be attained by regulating the spear rod?
ANSWER= [C] 90 mm
Detailed Solution for Civil Engineering Exam
Upon change in load: discharge is varied by varying the area of jet
Q1 = Q
Velocity of jet remains constant.
At full load; d=d1 =150mm
Q2 = 0.36Q
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AT 36% of full load, d = d2
Q = A * V1 = (π/4)d2 * V1
V1 = constant, Q ∝ d2
Q2/Q1 = (d2/d1)2
0.36 = (d2/150)2
d2/150 = 0.6
d2 = 90 mm