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Need for low frequency transformer in photovoltaic system?

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4 different combinations may be obtained with three resistors, each having the resistance R.

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What is the equivalent resistance of a network having 5 resistors of each 10ohm connected in parallel?  (A) 10 Ohms (B) 50 Ohms (C) 500 Ohms (D) 2 Ohms 

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
1 answer 16 views

Which of the following is true with a series circuit having resistors of different values? A) The total resistance of the circuit is the sum of the individual resistances B) The current across each resistor is the same C) The voltage drop across each resistor depends on the value of the resistor D) All the above

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
3 answers 52 views

what will be the capacitance if three capacitors connected in parallel each having value of 0.5 micro Farad ?

asked Dec 11, 2017 in Electrical Engineering by Quiz
1 answer 20 views

About how many times longer would a 10 watt light bulb be able to burn compared to a 100 watt bulb with the same energy?  (A) 10 times longer (B) 100 times longer (C) Same time (D) None of the above

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 10 views

Which of the following series combinations of resistors dissipates the most power when connected across a 120 V source? A. One, 220Ω resistor B. Two, 220Ω resistors C. Three, 220Ω resistors D. Four, 220Ω resistors

asked Apr 12, 2018 in Electrical Engineering by Shimroz123
0 answers 38 views

A balanced Delta connected load supplied with 440 V 50 Hz three phase AC supply has R=10 Ohm and L=0.6 mH in is each arm. Calculate line and phase current, active power.

asked Aug 12, 2018 in Basic electrical and electronics engineering by Quiz
1 answer 22 views

What is the total resistance if 5 resistors of 20 Ω each are connected in series? A) 100 Ω B) 4 Ω C) 20 Ω D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
0 answers 90 views

A conductor is composed of seven identical copper strands, each having a radius 'R'. Then what is self GMD (Geometric Mean Distance) of the conductor?  (A) 2.645 R (B) 2.177 R (C) 2.141 R (D) 1.21 R 

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
0 answers 18 views

When ‘n’ resistances each of value ‘r’ are connected in parallel, then the resultant resistance is ‘x’. When these ‘n’ resistances are connected in series, total resistance is  (A) n2X (B) X/n (C) n2/X (D) nX2

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
1 answer 9 views

A compact microstrip antenna may be obtained by

asked May 23, 2018 in Physics by Shimroz123
1 answer 37 views

what are different three main IC Technologies? discuss the advantages of each of them.

asked Jan 18, 2018 in Unit 1 by Shimroz
1 answer 58 views

Starting torque can be obtained in the case of a single phase induction motor with identical main and auxiliary windings by connecting:  (1) A capacitor across the mains (2) A capacitor in series with the machine (3) A capacitor is series with the auxiliary winding (4) Equal value capacitors in series with the main and the auxiliary windings

asked Apr 9, 2018 in Electrical Engineering by Shimroz123
1 answer 16 views

If three amplifiers having the same bandwidth are cascaded, the bandwidth of the resulting amplifier will be (a) Better than that of each stage (b) Worse than that of each stage (c) Same as that of each stage (d) None of the above 

asked Apr 25, 2018 in Electrical Engineering by Shimroz123
1 answer 19 views

How many bits Internet address is assigned to each host on a TCP/IP Internet which is used in all communications with host?  A) 16 bits B) 32 bits C) 48 bits D) 64 bits

asked Apr 11, 2018 in Computer Engineering by Shimroz123
1 answer 18 views

When three resistors with unequal values are connected in parallel, _______ A) The current across the resistors is the same  B) The voltage drop across the resistors is the same C) The voltage drops across the resistors is proportional to the resistance of each resistor D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
0 answers 19 views

A three phase transmission line delivers a load of 5 MW at 0.8 power factor lagging. Resistance of each conductor is 0.5 ohm / km. Receiving end voltage is 33 kV. If the line loss is not to exceed 10%, determine the length of the line.  (A) 7 km (B) 27.9 km (C) 56.8 km (D) 13.9 km

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
1 answer 23 views

Three phase synchronous motor will have how many sliprings?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
0 answers 14 views

A binary ladder with R -2R network has R = 20K Ohms. The total resistance looking out toward the LSB input is (a) 20KOhms (b) 40KOhms (c) 10KOhms (d) 30KOhms

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
0 answers 21 views

A dc shunt motor runs at 500 r.p.m at 220 V. A resistance of 4.5 Ω is added in series with the armature for speed control. The armature resistance is 0.5 ohms. The current to stall the motor will be (1) 44 A (2) 50 A (3) 44.4 A (4) 60 A  

asked Apr 11, 2018 in Electrical Engineering by Shimroz123
0 answers 49 views

A high-pass filter has a resistance R = 2 kΩ The lowest input frequency to be passed is 7.5 kHz. The value of suitable coupling capacitor must be: A) 0.001 pico Farad B) 0.01 pico Farad C) 0.1 pico Farad D) 1 pico Farad

asked Jun 4, 2018 in Electrical Engineering by Shimroz123
1 answer 21 views

What should be kVA rating of each transformer in V-V bank when three phase balanced load is 40 kVA ? (A) 19 (B) 28 (C) 37 (D) 23

asked May 13, 2018 in Electrical Engineering by Shimroz123
1 answer 10 views

How many characters per sec (7 bits + 1 parity) can be transmitted over a 2400 bps line if the transfer is synchronous (1 start bit and 1 stop bit)?  A) 300 B) 240 C) 250 D) 275

asked Apr 11, 2018 in Computer Engineering by Shimroz123
1 answer 43 views

For a short transmission line with r/x ratio of is 1.0, the regulation will be zero when the load power factor is

asked Apr 30, 2018 in Electrical Engineering by Shimroz123
1 answer 16 views

A 35 V dc supply is connected across a resistance of 600 ohm in series with an unknown resistance R. A voltmeter having a resistance of 1.2 kOhm is connected across 600 ohm resistances and reads 5 V. The value of resistance R shall be:

asked May 22, 2018 in Electrical Engineering by Shimroz123
0 answers 50 views

A moving coli ammeter has a fixed shunt of 0.02 Ω with a coil circuit resistance of R=1 kΩ and needs potential of 0.5 V across it for full scale deflection. Calculate the value of shunt to give full scale deflection when the total current is 10 A. (1) 0.05 Ω (2) 0.005 Ω (3) 0.5 Ω (4) 0.0005 Ω

asked Apr 11, 2018 in Electrical Engineering by Shimroz123
0 answers 18 views

A parallel combination of capacitance C and resistance R is connected in series with inductance L and small resistance r. Under what condition will the circuit be non-reactive?  (A) C=LR (B) C=LR2 (C) C=L/R2 (D) C=L/R

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
1 answer 25 views

If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 23 views

Five cells, each with an e.m.f. of 2V and internal resistance of 0.5Ω are connected in series. The resulting battery will have

asked May 14, 2018 in Electrical Engineering by Shimroz123
1 answer 8 views

A two-phase generator is connected to two 90Ω load resistors. Each coil generates 120 V ac. The value of current flowing through the common neutral line will be: A. 1.33 A B. 1.88 A C. 2.66 A D. 1.77 A

asked Apr 12, 2018 in Electrical Engineering by Shimroz123
2 answers 76 views

 With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals?

asked Mar 25, 2018 in Basic concepts by Shimroz123
1 answer 17 views

Approximately how many milliamperes of current flow through a circuit with a 40 V source and 6.8 k ohms of resistance? A.27.2 mA B.59 mA C.5.9 mA D.590 mA

asked May 15, 2018 in Basic concepts by Shimroz123
1 answer 22 views

The kVA rating of Three-phase transformer with Voltage = 200V and Current = 100A will be :  (A) 34.64 kVA (B) 75 kVA (C) 20 kVA (D) None of the above

asked May 8, 2018 in Electrical Engineering by Shimroz123
0 answers 22 views

How many servos can be controlled by Arduino?

asked Mar 15, 2018 in Arduino by Zeeshan
1 answer 16 views

For optimum generator scheduling for different power plants, the minimum fuel cost is obtained when

asked May 8, 2018 in Power system by Shimroz123
1 answer 14 views

Three identical resistors connected in star consume 5000 W. If the resistors are connected in delta across the same supply, the power consumed will be

asked May 8, 2018 in Electrical Engineering by Shimroz123
3 answers 133 views

Three resistors of 4 Ω, 6 Ω and 9 Ω are connected in parallel. Which resistor consumes the maximum power?  (A) 4 Ω (B) 6 Ω (C) 9 Ω (D) 17 Ω

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
0 answers 27 views

A star circuit has element of resistance R/2. The equivalent delta elements will be?

asked Mar 25, 2018 in Network Analysis by Shimroz123
2 answers 238 views

The equation of 50 Hz current sine wave having r.m.s. value of 60 A is?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 9 views

 Three different points are shown on a dc load line. The upper point represents the : -  a) minimum current gain b) quiescent point c) saturation point d) cutoff point

asked Apr 11, 2018 in Electrical Engineering by Shimroz123
2 answers 46 views

what are the three different types of Electric power?

asked Dec 4, 2017 in Electrical Engineering by Quiz
0 answers 82 views

Three single phase transformers each with 10 kVA rating are connected in a closed delta arrangement. If one transformer is taken out, the output capacity of the system will be (a) 20 kVA (b) 8.66 kVA (c) 17.32 kVA (d) 10 kVA

asked May 25, 2018 in Single phase transformer by Shimroz123
0 answers 9 views

Two wattmeter method can be used in a three phase system excited with balanced three phase supply  A) To measure real power and power factor in a balanced load B) To measure reactive power in a balanced load C) To measure real power in an unbalanced load D) All of the above 

asked Apr 9, 2018 in Electrical Engineering by Zeeshan
1 answer 56 views

Write how energy can be stored or generated in each of following : i) solar cell ii) geothermal energy iii) hydrogen energy in biomass.

asked Sep 8, 2018 by Shimroz123
1 answer 11 views

The three non -inductive loads of 5 kW, 3 kW and 2 kW are connected in a star network between R, Y and B phases and neutral. The line voltage is 400 V. The current in the neutral wire is nearly (a) 11 A (b) 14 A (c) 17 A (d) 21 A

asked Apr 25, 2018 in Electrical Engineering by Shimroz123

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