13085. The highest efficiency is obtained with a channel of __________ section.

By Admin / September 13, 2025

circular

square

rectangular

trapezoidal

✅ The correct answer is option D.

13078. The boiler efficiency is given by (where m = Total mass of water evaporated into steam in kg/h, mf = Mass of fuel in kg/h, C = Calorific valve of fuel in kJ/kg of fuel, h = Total heat of steam in kJ/kg, and hf1 = Sensible heat of feed water in kJ /kg)

13051. The linear acceleration (a) of a body rotating along a circular path of radius (r) with an angular acceleration of α rad / s2, is

1. A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm².

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2. Transformer cores are normally made from

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