Q4 Find V1 and V2 in the circuit shown below. Also calculate 11 and 12, and the power dissipated in the 120 And 400 resistors. 15 V 12 Ω ww + 60 ww www. 10 Ω + www iz 40 Ω
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- Q1 / A DC shunt generator delivers 187 A at 260 V. The armature resistance and shunt field resistance are 0.028 2 and 48 2 respectively. The sum of stray losses equal 950 W. Find the machine efficiency.If the full load copper loss of transformer is 310 W, then the copper loss at 75% of load is given by 77.50 W 310.00 W 174.38 W 19.38 WAn armature has a resistance of 0.2 Ω at 150°C and the armature Cu loss is to be limited to 600 wattswith a temperature rise of 55°C. If α0 for Cu is 0.0043/°C, what is the maximum current that can bepassed through the armature ?
- A 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.In 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. NoneCalculate the Resistance , if the RTD temperature is 1298.3 oC and Sensitivity is 9.2 oC/ohm a.11944.36 b.2.30 c.1307.50
- 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 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 rpmRecall that power available at altitude is (rho/rho0)*power at sea level. Include transmission losses! [~, a, ~, RHO, ~] = atmosisa(alt(k1)*0.3048); rho=RHO*0.0685218/35.3147; rho_scale=rho/rho0; a=a/0.3048;
- 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.A piezoelectric actuator is made from a stack of 20 square piezoelectric pads, each 10mm squarewith a thickness of 2mm? Calculate the maximum displacement when 1kV is applied given that d33=100×10-12 C/N, er = 50 and Y = 50GPa.The collector leakage current in a transistor is 300 μA in CE arrangement. If now the transistor is connected in CB arrangement, what will be the leakage current? Assume β = 120. (2) For a certain transistor, IB = 20 μA; IC = 2 mA and β = 80. Calculate ICBO. (3) In a transistor, IB = 68 μA, IE = 30 mA and β = 440. Determine α rating of the transistor. Then determine the value of IC using both the α rating and β rating of the transistor.