A factory is fed from a transformer rated 450KVA, the peak demand power is 350KW and the power factor at the peak demand load is 0.7. Determine the capacitor bank that must be installed to improve the power factor to 0.9 Select one: 187.5587 kvar None of these 250.4678 kvar 200.3468 kvar 190.3567 kvar

Q: If the full load copper loss of transformer is 378 W, then the copper loss at half load is given by…

A: We copper losses are proportional to square of current , at half loaf current will be half .

Q: Three 100kVA 34.5kV primary 12/6.9kV secondary. Connect the transformers delta-wye. What is the…

A: Given: A transformer with Three 100kVA 34.5kV primary 12/6.9kV secondary. Primary is delta…

Q: If the full load copper loss of transformer is 212 W, then the copper loss at 75% of load is given…

A: Full load copper loss = 212 W Copper losses at 75% loading?

Q: Determine the apparent power, active power and reactive power in a series circuit, when the supply…

A:

Q: Determine the average power supplied by each source in the circuit jin jin 1020° V(:) (1) 2230° A

A:

Q: An alternating current completes 5 cycles in 8 ms. What is its frequency?

A: Number of cycles = 5 Time = 8ms

Q: For the circuit shown in figure beside, find the total average power delivered to the circuit? * J5…

A:

Q: 45. A 3-phase, 5 kW induction motor has a p.f. of 0.75 lagging. A bank of capacitors is connected in…

A: Given: A 3-phase, 5 kW induction motor has, Power factor, cosϕ1=0.75 lagging…

Q: efficiency

A:

Q: two 3phase alternators in parallel are both operating at the same frequency. What is theremedy if…

A: Parallel operation of Alternator AC power systems are often interconnected for efficiency, reliable…

Q: In case of a Balanced load, the impedance values in all three phases should be same in magnitude and…

A:

Q: A 2400/2200 volt auto transformer delivers a load of 90.5 Kw at a pf of 0.75. Solve for the current…

A: Given:Transformer: 2400/2200Load=90.5KWPower factor= 0.75

Q: Determine the generator resistance if the noise factor is 3 and the equivalent noise resistance is…

A: Given data, Noise factor = 3 Equivalent noise resistance = 10 kΩ

Q: In a single phase transformer, if the average value of emf is 239 V, then RMS value is

A:

Q: A 500 kVA transformer has a constant loss of 500 W and copper loss at full load are 2000 W. Then at…

A: Solve the problem

Q: One of the following is not a law for power factor calculation. O P/S O cose O Q/P O P/VI

A:

Q: In a relation to a transformer the ratio 6/1%3B indicates that O Primary current is 6 times greater…

A:

Q: A 10 KVA step-up transformer having a turns ratio of 1:5 has a primary voltage of 2.5 kV. Calculate…

A: A Power S= 10 KVA step-up transformer  a turns ratio N1:N2= 1: 5 has a primary voltage Vp=  2.5 kV.…

Q: It has been decided to establish a new electrical machines laboratory. This project includes a new…

A: “Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

Q: In a single phase transformer, if the RMS value of emf is 240 V, then the average value is O 138.56…

A:

Q: <0° 39 VI 1Ω j2 Ω tele -j1 Ω tr j2 Ω j2 Ω j2 Ω 1Ω tele j1 Ω -j2 Ω

A: Zin  impedance seen from the source in the transformer circuit . Circuit:-

Q: Single phase transformer has 24KVA, 2400/240, 50 Hz. Its series impedance Z, 0.15+j0.6pu connected t…

A:

Q: Three coils each having resistance of 26 Q are connected in star across 438 V, 50 Hz supply. Then…

A: Need to find power

Q: The total impedance in the polar form in ohm. The total current in polar form. The total power…

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Q: Draw the graph of efficiency against load current when the transformer is loaded 12:48 PM

A:

Q: In a 132 kV, 50 Hz system, reactance and capacitance up to the location of the circuit breaker is 50…

A: Given information is shown below:

Q: Delta-Star connection of transformer is best suitable for_ loads. O Power о Сараcitive O Both…

A: Choose the correct option Delta star connection of transformer is best suitable for...... Loads.…

Q: Two 300-VA parallel-connected transformers can supply a maximum load of a. 150 VA b. 300 VA C. 450…

A: Two 300 VA parallel connected transformer can supply a maximum load of, equal to the sum of their…

Q: A Load absorbs 10 kVA at a lagging power factor of 0.6. The complex power is: Select one: a. 2000+…

A: The correct solution is given below

Q: transformer losses and exciting current are neglected, the transformer series reactance is .06 p.u…

A: Subtransient reaction engine reaction during the first short-circuit cycle. Temporary reaction…

Q: If the core loss of single phase transformer at full load is 236 W, then the core loss at 50% of…

A: Core losses are constat at any load .

Q: For the following circuit, determine the secondary voltage of the transformer. 120V O 480 V O 30 V…

A: Given: Primary side voltage, VP=120V Turns ratio, NP:NS=4:1 So N=NPNSN=41

Q: A three phase alternator has 48 slots and 4 pole. Find its distribution factor. A)0.9717 B)0.2298…

A: Given: Phase (m)=3 slots (s)=48 number of poles (P)=4

Q: In a single phase transformer, if the RMS value of emf is 221 V, then the average value is 199.10 O…

A:

Synchronous Motor

The synchronous motor is an AC electric type motor where at a steady-state the shaft rotation is synchronized with the supply current variable-frequency. To an integral number of AC cycles, the rotation period is exactly equal. The stator of the motor in the synchronous motor contains multi-phase AC electromagnets due to which a magnetic field is created that rotates in time with the oscillation of the line current. The rotor contains a permanent magnet and the rotor rotates in synchronization with the stator field at the same rate and provides the second synchronized magnetic field which is rotating in nature as a result. When the synchronous motor is supplied with independently excited multi-phase AC electromagnets on both the rotor and the stator, it is termed as a doubly-fed machine. The most widely used AC-type motors are the synchronous AC motor and the induction AC motors.