Literature review on the different types of protective relays used for the protection of radial systems.

In: Electrical Engineering

explain the operation of potentiometric transducer

In: Electrical Engineering

1.
May you expalin why induction motors are necessary and the
difference if induction motors with the normal motors?

2. air circuit breakers how do they operate disadvantage and
advantage

3. with a simple terminology may you explain
cycloconverters?

4.expalin what is thyrestor, thermister?

it
can be to drive a pump or induction generator

In: Electrical Engineering

8.
A 100 W load is connected to a 50 W transmission line. Determine
the value of the reactance to put in series at the input to the
line and the length in wavelengths of the shortest transmision line
to match with a 50 W source.

In: Electrical Engineering

Problem 4. (10 pts) Voltage amplifiers are available with Avoc = 8 V / V, Rin = 1.8 kΩ, Ro = 850Ω. With a 12V DC power source, each amplifier consumes 1.5 mA average current.

a.how many amplifiers does it need to connect a cascade to obtain at least gain a voltage of 1000 with a load resistance of 1.0kΩ?

b. What is the voltage gain Av obtained? (Answer with a whole number rounded)

c. For the cascade connection, find the open circuit voltage gain. (Respond with a rounded integer)

d. If you have a 1.5 mV input, What is the efficiency of the equivalent amplifier?

e. Find the transconductance of the entire circuit.

In: Electrical Engineering

Explain the power balance in an induction motor.

In: Electrical Engineering

The Voltage amplifiers are available with Avoc = 8 V / V, Rin = 1.8 kΩ, Ro = 850 Ω. With a 12V DC power source, each amplifier consumes 1.5 mA average current. a. How many amps do you need to cascade to get so minus a voltage gain of 1000 with a load resistance of 1.0 kΩ? b. What is the voltage gain Av obtained? (Answer with an integer number rounded) c. For the cascade connection, find the open circuit voltage gain. (Answer with a rounded integer) d. If you have a 1.5 mV input, how efficient is the equivalent amplifier? and. e.Find the transconductance of the complete circuit

In: Electrical Engineering

Plate values of a three-phase transformer are given
below:

1600 kVA, 15 kV / 400 V, 50 Hz, io = 1.2%; ukN = 6%, idle losses
2450 W, rated copper losses of power 14500 W; Dy5.

a) Calculate primary and secondary line and phase currents.

b) Secondary at 75% load in power factor with 0.85 inductance and
0.85 capacity calculate the voltage separately. Compare and
interpret the results. capacity at what time of day can the upload
be seen? To prevent voltage change What solution should be
applied?

c) Calculate the rated operating efficiency and maximum efficiency
of the transformer.( Power Factor of b) can be used in c).

d) Draw the fastening group. How is this transformer parallel with
the transformer Dy11 connected

run?

e) If this transformer is operated at 60 Hz, which sizes change
how?

Your review.

In: Electrical Engineering

1. design a mod-16 ripple down counter using positive triggered

2. design a synchronous counter to count in the following sequence : 15, 9,, 11, 5, 2, 13, 1

In: Electrical Engineering

Identify and discuss the role of energy efficiency in residential, commercial, and industrial sectors Discuss the policy actions to be taken to promote energy efficiency programs?

In: Electrical Engineering

It composed 16K × 16 memory by using two DRAM chips that have 8K capacity. If the row × column matrix is square for the address, how many address lines and how many data lines should each chip have?

In: Electrical Engineering

Mookodi Enterprise is a business consultancy with 543 employees. They are based in the north of Johannesburg on a 10Ha campus. Mookodi connects to the national grid at 11kV and pays a seasonal industrial low voltage (LV) tariff of 141.67 cents in summer and 165.94 cents in winter. Thirty percent of Mookodi’s employees are based at their clients’ offices and are not permanently based on the campus.

The campus has the following buildings:

- Canteen (Purple)
- Welcome Centre, Gym and Conference Centre (Green)
- Guardhouse (Light blue)
- Main Office Building 1 (Maroon)
- Main Office Building 2 (Dark blue)

Below is the campus’ electricity consumption over the last year:

MONTH |
TOTAL KWH |
ACTUAL BILL |
DIFFERENCE |

January |
218980 |
220000 |
0% |

February |
220721 |
242000 |
-9% |

March |
227258 |
223000 |
2% |

April |
241226 |
245000 |
-2% |

May |
236821 |
245000 |
0% |

June |
262960 |
267078 |
-2% |

July |
300857 |
298047 |
1% |

August |
246849 |
245399 |
1% |

September |
222451 |
225476 |
-1% |

October |
208031 |
209000 |
0% |

November |
215118 |
219000 |
-2% |

December |
219604 |
215000 |
2% |

**QUESTION 1**

**in 800 words discus the campus’ load
profile**

In: Electrical Engineering

3- (10 pts) Make a status table for a 3-bit counter that with input x = 1 counts the odd numbers and with input x = 0 counts the even numbers backwards.

Help me please! Thanks!!!

In: Electrical Engineering

What does a transfer function represent?

What are the poles and zeros of a transfer function?

What is the characteristic polynomial?

What is stability?

What is the condition of stability when the system has been expressed in differential equation form?

What is the condition of stability when the system has been expressed in transfer function?

In: Electrical Engineering

Question 2

(b) Consider a person standing in a breezy room at 20°C.
Determine the total rate of heat transfer from this person if the
exposed surface area and the average outer surface temperature of
the person are 1.6 m2 and 29°C, respectively, and the convection
heat transfer coefficient is 6 W/m2 • °C.

(c) A specific strength of materials is very high when they
are

in fiber size but lower when they are in bar form - Why?

In: Electrical Engineering