Which statement is true about touch and step potentials: Select one: O a. Both of them can cause electric shock O b. Touch potential can be reduced by increasing the ground resistance of grounded structures. O. Step potential can be minimized if a person increases his step length
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- 7. A coil having a resistance of 20 ohms and an inductance of 0.75 henry is connected in series with a 30-ohm resistor and to a 120-volt d-c source. A switch across the series resistor is then closed, and the circuit is assumed to be in a steady-state condition. At the instant the switch is opened, what will be the rate of current change and the power delivered by the magnetic field.a) A sinewave is having a frequency of 100 Hz and instantaneous value of 150 Volts at 1.4 milli seconds. Find i) The maximum value of sinusoidal voltage waveform and ii) The value of voltage at 1.7 milli seconds. b) Determine the instantaneous equation for the voltage waveform shown in figure, if Vp=200 Volts, Time period is 5 milli seconds and 0 =40 degrees. Vp t = 0 Upload your Answers steps in the "Final Answer Submission" Link provided in the Moodle. a) (i) Maximum value = a) (ii) Value of voltage at 1.7 ms = b) Angular frequency =Q3) In a two-excitation and two-pole machine, the rotor and stator of both poles are prominent relations The inductor of the rotor and stator is as follows: Lss =(0.5 + 0.2cos20) H Lrr =(0.8 + 0.3cos20) H Lsr =0.7coseH The resistance of the windings is zero. If the rotor is in the position 0 =60 ° and flows from the stator A sinusoid with an effective value of 10A passes and the rotor winding is short, medium torque Calculate the impact on the rotor
- What are the rotating parts on d.c machine. commutator segments O brushes O inter-pole O pole shoeMaz a) A sinewave is having a frequency of 50 Hz and instantaneous value of 250 Volts at 1.3 milli seconds. Find D The maximum value of sinusoidal voltage waveform and i) The value of voltage at 2.1 milli seconds. b) Determine the instantaneous equation for the voltage waveform shown in figure, if Vp=100 Volts, Time period is 10 milli seconds and 0 =40 degrees. on Vp Upload your Answers steps in the "Final Answer Submission" Link provided in the Moodle. a) (i) Maximnum value = a) (ii) Value of voltage at 2.1 ms = b) Angular frequency =a) A sinewave is having a frequency of 50 Hz and instantaneous value of 150 Volts at 1.2 milli seconds. Find i) The maximum value of sinusoidal voltage waveform and i) The value of voltage at 1.7 milli seconds. b) Determine the instantaneous equation for the voltage waveform shown in figure, if Vp=100 Volts, Time period is 5 milli seconds and 0 =50 degrees. Vp i= 0 Upload your Answers steps in the "Final Answer Submission" Link provided in the Moodle. a) (i) Maximum value = a) (ii) Value of voltage at 1.7 ms b) Angular frequency %3D
- DC machine questionQuestion: A 4 Pole DC Generator Is Wounded Lap. It Rotates At 500rpm To Be Able... A 4 pole DC generator is wounded lap. it rotates at 500rpm to be able to generate 150 V of open circuit voltage. What is the percentage decrease in the exixting flux per pole if a frequency of 10 rps can produce 120 V? %.If the prime mover torque suddenly falls by a considerable amount, the damperwinding of the alternator witnesses the flow of a massive current through it, which further opposes the prime mover torque.True or False Subject Electrical Engineering Sub-subject Search And Select
- The frequency of voltage generated in SG depends on: Select one:a. Number of polesb. number of poles and speed rotationc. Field currentd. Rotor speede.Number of poles, speed rotation and type of windingb) A newly built institution has bought a D.C. shunt generator to supply a library in order for students to study using electrical power from this machine when there is load shedding on the national grid. The total load of the library is 50 kW through the cables of total resistance of 0.04. The winding resistance of the generator is 5092 and the armature resistance is 0.072832. The library is to be supplied at 0.4kV. i. Draw the circuit diagram indicating all the above stated values. ii. Determine the load current (IL). iii.Determine the terminal voltage of the generator. iv. Determine the armature current. v.Determine the E.M.F. generated in the armature.A triplex wave-wound armature is used in a 6-pole DC machine. The number of coils is 111 each of which contains 12 turns. The resistance of each turn is 0.0112. Its flux per pole is 0.038 Wb, and its rotational speed is 230 rpm Calculate the number of conductors in the machine Calculate the the number of current paths in the machine Calculate the constant K'