Run at constant speed
A dc series motor (A) should always be started on load (B) is most suitable for high starting torque. (C) always run at constant speed. (D) may 'run away' if the field gets opened.
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In a Carnot cycle, heat is supplied at 350°C and rejected at 27°C. The working fluid is water, which, while receiving heat, evaporates from liquid at 350°C to steam at 350°C.
A composite load consists of two loads connected in parallel. One draws 100 W at a PF of 0.8 lagging, another takes 200 W at a PF=1. What is the PF of the composite load ?
A pickup truck with a mass of 1230 kg is moving at 105 km/h stops within a distance of 53.0 m. (a) What is the direction and size of the force that acts on the truck? (b) How much more slowing force would be required to stop the truck in half the
How many times more ignition energy is required to achieve ignition of a fuel-air mixture at sea level with T = 298 K than at altitude of 6000 m where pressure P = 47,166 Pa and T = 248 K?
Two students are on a balcony 20.1 m above the street. One student throws a ball (ball 1) vertically downward at 13.0 m/s; at the same instant, the other student throws a ball (ball 2) vertically upward at the same speed. The second ball just miss
A machine used for making (cutting) gears is called a gear hobbing machine. The gear train below shows the essential features of the work spindle drive for a gear hobbing machine.
At 710.mm hg a sample of nitrogen gas occiuped 625 ml. what volume does gas occupy if the temperature remains constant and the pressure increases to760.mm hg?
Three resistors R1, R2 and R3 are connected in series and a supply voltage of 240 V. If R2 = 2R1, R3 = 3R1 and the total power taken by the circuit is 480 watts. Calculate the power in each resistor?
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