A 3 kVA motor operates from a 240 V supply at 50 Hz and has a power factor of 0.6. Determine the active power Select one: 1800 W Non of the Answers 1900 W 2000 W
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- Two transformers rated at 100 kVA each are connected in an open-delta connection. What is the total output power that can be supplied by this bank?A 3-phase, 50 Hz, 3000 V motor develops 600 H.P. (447·6 kW), the power factor being 0·75 lagging andthe efficiency 0·93. A bank of capacitors is connected in delta across the supply terminals and powerfactor raised to 0·95 lagging. Each of the capacitance units is built of five similar 600-V capacitors.Determine the capacitance of each capacitor.The input power to a 3-phase load is measured as 6700 watts. If the line voltage and line current to the load are 430 V and 18 A respectively. The power factor of the System is,
- An 8 pole, lap connected armature has 500 conductors and its generated e.m.f is 120V. If the flux per pole is 20 mWb, then the speed of machine is,To what is the voltage regulation of a DC generator proportional?An inductor has an inductance of 0.025 H and a wire resistance of 3 Ω. How long will it take the current to reach its full Ohm’s law value?
- Two wattmeter’s indicate 6 kW and 5kW respectively when connected to measure the input power to a 3 phase balanced load, the reverse switch being operated on the meter indicating 5kW reading. Determine (a) the input power and (b) the load power factor.A six-pole lap wound armature rotating at 350 rpm is required to generate 260 V. The effective flux per pole is about 0.05 Wb. If the armature has 120 slots, determine the suitable number of conductors per slot and hence determine the actual value of flux required to generate the same voltageA long-shunt compound-wound generator gives 240 volts at F.L. output of 100A. The resistances of various windings of the machine are : armature (including brush contact) 0.1 Q, series field 0.02 Q, inter pole field 0.025 2, shunt field (including regulating 0.2 resistance) 100 2. The iron loss at F.L. is 1000 W; windage and friction losses total 500 W. Calculate F.L. efficiency of the machine.
- A 4-pole shunt generator with wave-wound armature has 41 slots, each having 12 conductors. The armature resistance is 0.05 ohms and shunt field resistance s 200 ohms. The flux per pole is 25 mWb, if a load resistance of 10 ohms is connected across the armature terminals, calculate the voltage across the load when generator is driven at 1000 rpmIn a given DC motor, the output power is 20 HP, and the copper losses are 1.1 KW. If the motor is operating at 87 % efficiency, find the converted power and the rotational losses. Select one: a. Pconv = 16.05 KW and Prot = 1.13 KW b. Pconv = 17.15 KW and Prot = 3.11 KW c. Pconv = 14.92 KW and Prot = 1.35 KW d. NoneGiven that the loading is smooth, which we can interpret as uniform loading of the driven and driving machine, what is the the overload factor, Ko?