f 121. A 400 V shunt motor takes a current of 120 A and runs at 1000 rpm. The armature resistance is 0.2 ohm. Calculate the speed with the same torque if magnetic flux is reduced to 80% of the initial. A. 1230 rpm B. 1240 rpm C. 1260 rpm D. 1250 rpm
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- A 220 V shunt motor has an armature resistance of 0.4 ohm and field resistance of 140 ohm. The motor draws 6 A at 1600 rpm at no load. Calculate the speed and shaft torque if the motor draws 52 A at rated voltage.1. The operation of Commutator in DC Motor is * O a) to convert dc to ac O b) to convert ac to dc O c) to convert fixed dc to variable dc O reverse the current direction in the rotating windings each half turnA dc series motor has an armature resistance of 0.06 Q and series field resistance of 0.08 Q. The motor is connected to a 400 V supply. The line current is 20 A when the speed of the machine is 1100 rpm. When the line current is 50 A and the excitation is increased to 30%, the speed of the machine in rpm is 837 RPM 938 RPM 1003 RPM O 1100 RPM A d.c. series motor takes 40 A at 220 V and runs at 800 r.p.m. If the armature and field resistance are 0.2 Q and 0.1 Q respectively and the iron and friction losses are 0.5 kW, the torque developed in the armature and the output of the motor will be 80.5 N-m , 11.57 kW 96.2 N-m, 10.63 kW 99.3 N-m, 7.82 kW
- A 220 V shunt motor has an armature resistance of 0.5 ohm and takes a current of 40 A on full-loads. By how much must the main flux be reduced to raise the speed by 50% if the developed torque increased by 10 %A 250 V series motor has an armature resistance of 0.2 ohm and a series-fieldresistance of 0.18 ohm. If the speed is 6oo RPM when the current is 32 amps.What will be the motor speed when the load is reduced so that the current is18 amps, under which condition the percent flux change is 50 % of the percentcurrent change.2. A 2-pole, 50 Hz induction motor supplies 15 kW to a load at a speed of 2950 rpm. a. What is the motor's slip? b. What is the induced torque in the motor in N-m under these conditions? c. What will be the operating speed of the motor be if its torque is doubled? d. How much power will be supplied by the motor when the torque is doubled?
- A 240V dc series motor has armature and field resistances of 0.5 W and 1 W respectively. When running at 1200 rev min-1 the motor draws 15A from the supply. Calculate the torque delivered. A 2 W resistor is connected in series with the motor. The torque is adjusted so that the armature current remains unchanged. Calculate the new speed and torqueA 230v DC series motor takes 30A when giving its rated output at 1400 rpm. It has a field resistance of 0,4 ohms, Calculate the value of the resistance (Ra) of the armature when Eb = 200V. Select the correct response: 0.2 ohms 0.6 ohms 0.8 ohms 0.4 ohms8. A 3-phase induction motor is running at 2% slip. If the input to rotor is 1000 W, then mechanical power developed by the motor is ............ (i) 20 W (iii) 500 W (ii) 980 W (iv) 200 W
- At no load, a 250V shunt motor runs at 1000 rpm and draws 8A. Armature and field resistances are 0.20 ohm and 250 ohms, respectively. If the motor draws a current of 50A, its speed will be459. The current drawn by a 460 V dc motor of armature resistance 0.5 ohm and back emf 420 V is -A 3-phase 440 V, 50 Hz induction motor has 4% slip. The frequency of rotor current a. 48 Hz b. 2 Hz c. 50 Hz d. 100