(a) Once an ideal inductor is connected to a 220 V, 50 Hz a.c supply and...

(a) Once an ideal inductor is connected to a 220 V, 50 Hz a.c supply and later the same inductor is connected to 220 V, 100 Hz a.c supply. What happens to the current flowing through it in both the cases? Will the current be the same or different? Give brief reason (2marks)

(b) A current of 12A flows in a when connected to a 240V , 50Hz AC mains and 2A from a 12V DC mains. Find the values of (i) the resistance (ii) impedance (iii) inductance of the coil (3marks)

Expert Solution

genius_generous answered 2 years ago

Tests were carried out on a three-phase 220 V, 50 Hz, 4-pole delta-connected induction motor. The...

Tests were carried out on a three-phase 220 V, 50 Hz, 4-pole delta-connected induction motor. The following results were obtained from open circuit (no-load) and short circuit tests. Open Circuit (no-load) Test Applied Stator Voltage VLine (V) Stator Line Current ILine (A) Total Input Power Pin (W) 240 9.6 536 220 7.2 420 200 5.4 352 180 4.3 304 160 3.5 276 140 3.0 248 120 2.5 224 Short Circuit (locked rotor) Test Applied Stator Voltage VLine (V) Stator Line...

The voltage across an inductor is 65 V and has a frequency of 430 Hz. If...

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A 24.0-V battery is connected in series with a resistor and an inductor, with R =...

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Q3) A three-phase, Y-connected, 220 V, 13 kW, 60 Hz, six-pole induction motor has the following...

Q3) A three-phase, Y-connected, 220 V, 13 kW, 60 Hz, six-pole induction motor has the following parameter values in Ω/phase referred to the stator: R1 = 0.3 Ω. R2' = 0.15 Ω X1 = 0.5 Ω. X2'= 0.21 Ω Xm = 13.25 Ω The total rotational losses are 450 W. The core loss is lumped in with the rotational losses. For a slip of 0.02, and based on approximate equivalent circuit, determine: (i) The rotor speed. (ii) The stator current....

A 120 V rms voltage at 60.0 Hz is applied across an inductor, a capacitor, and...

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A 50-Hz, 440-V, 2 pole wye connected induction motor is rated at 75 kW. The equivalent...

A 50-Hz, 440-V, 2 pole wye connected induction motor is rated at 75 kW. The equivalent parameters are as follows: RS = 0.075 Ω RR’ = 0.065 Ω XS = XR’ = 0.17 Ω Xm = 7.2 Ω The losses associated with the machine are field and winding, miscellaneous and core loss with values of 1 kW, 150 W and 1.1 kW, respectively. For a slip of 4 %, determine a) The line current. (150.39  -23.08 A) b) The...

A 50-Hz, 440-V, 6 pole wye connected induction motor is rated at 75 kW. The equivalent...

A 50-Hz, 440-V, 6 pole wye connected induction motor is rated at 75 kW. The equivalent parameters are as follows: RS = 0.082 Ω; RR’ = 0.07 Ω; XS = 0.19 Ω; XR’ = 0.18 Ω; XM = 7.2 Ω The losses associated with the machine are field and winding, miscellaneous and core loss with values of 1.3 kW, 150 W and 1.4 kW, respectively. For a slip of 4 %, determine: a) The line current b) The stator power...

A 10-pole induction motor is fed with a 230 V, 50 Hz supply used to drive...

A 10-pole induction motor is fed with a 230 V, 50 Hz supply used to drive multiple loads with 0.85 power factor. Answer the following. i. State 3 types of starting circuit. ii. Calculate angular speed (Ns) in rpm and slip (S). Given rotor speed 550 rpm. iii. Calculate the efficiency of the motor. Given output power 1000 W, copper loss 10 W, core loss 5 W and rotational losses 80 W.

A 159 ?H inductor is connected to a 159 pF capacitor to form an ideal series...

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A 3-phase, 380 V, 50 Hz , 6 pole, Y-connected induction motor has R1 = 0.1...

A 3-phase, 380 V, 50 Hz , 6 pole, Y-connected induction motor has R1 = 0.1 W , X1 = 0.4 W, R2’ = 0.12 W , X2’ = 0.4 W, Xm = 20 W , Pr = 1 kW. The motor is operated at 970 rpm what is the efficiency?

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