One of the following is used to control the speed of the motor. O a. Varying field voltage а. O b. Varying supply voltage. Ос. O c. Varying armature resistance O d. Varying supply current
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- One of the following is used to control the speed of the motor. O a. Varying field voltage O b. Varying supply voltage. O. Varying supply current O d. Varying armature resistanceA 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 kWA series motor runs at 800 rev/min when the voltage is 400V and the current is 25A. The armature resistance is 0.4 ohm and the series field resistance is 0.2 ohm. Determine the resistance to be connected in series to reduce the speed to 600 rev/min with the same current.
- What are the options suits for a slip ring induction motor? (A) Slip ring induction motor has high starting torque (B) Slip ring Induction motor has a complicated construction (C) Slip ring induction motor has high efficciency (D) Slip ring induction motor has more copper loss O a. (A) and (B) O b. (A), (B) and (C) O c. (A) and (C) O d. (A), (B) and (D)3.) The time delay fuse using the strict standard rating for 2Ø, 230 V, 7.5 hp SCIM motor is A. 25 A B. 30 A C. 35 A D. Any of the above459. The current drawn by a 460 V dc motor of armature resistance 0.5 ohm and back emf 420 V is -
- The current drawn by 220 V dc shunt motor of armature resistance 0.5 ohm and back emf 200 V isdiscuss how the dc motor is used in washing machineassume that a series motor is taking the same current with the conditions that 440v motor takes a 25 a and runs at 800 rpm the armature resistance including the resistance of the series winding is 0.77ohms calculate the speed will it run if a 1.88 resistance is connected in series with the supply voltage
- Induction motor Select one: O a. isused in limited applications O b. is doubly fed motor since it carries AC current in both stator and rotor windings O. carries alternating current in both the stator and the rotor windings, thus singly-fed.A series motor runs at 800rpm when the voltage is 400v and the current is 25 ampere the armature resistance is 0.4ohm and the series field resistance is 0.2ohm determine the resistance to be connected in series to reduce the speed to 600rpm with same currentA 250 V d.c. shunt motor takes a current of 20 A. Resistance of shunt field winding is 200 ohm and the armature is 0.3 ohm. What is the current in the armature ?