i need the answer quickly irks)1-A 1-ph transformer, 50HZ, core type transformer bas square core of 24 cm side. The tluxdensity is 1 Wb/m. If the iron factor is 0.95, the approximately induced voltage per tumis ----------.a) 6 b) 11c12 d) none of the above.2-A transformer has full-load iron loss of 500 W. the iron loss at half-load will bea) 125 W b) 250 W O500 W d) none of the above.3-A transformer will have maximum efficiency at:a) full-load no-load c) 90% load O none of the above4- The hysteresis loss in a certain transformer is 40W and the eddy current loss is 50 W(both at 30HZ), then the iron loss at 50 Hz isKef2The flux density being thesame.a) 180WO 204W c) 302 d) none of the previous.5- The voltage per turn of the high voltage winding of a transformer isper turn of the low voltage winding.a) More than bthe same as c) less than d) none of the previous- the voltage

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A l-ph transformer, 5OHZ, core type transformer has square core of 24 cm side. The hux density is 1 Wb/m. If the iron factor is 0.95, the approximately induced voltage per turn is -------- a) 6 b) 11©12 d) none of the above. -A transformer has full-load iron loss of 50 W. the iron loss at half-load will be a) 125 W b) 250 W O500 W d) none of the above. -A transformer will have maximum efficiency at----- a) full-loadpno-load c) 90% load @ none of the above - The hysteresSIS loss in a certain transformer is 40W and the eddy current loss is 50 W (both at 30HZ), then the iron loss at 50 Hz is Kef2 K. -. The flux density being the same. a) 180WO 204W c) 302 d) none of the previous. - The voltage per turn of the high voltage winding of a transformer is per turn of the low voltage winding. a) More than - the voltage the same as c) less than d) none of the previous

A l-ph transformer, 5OHZ, core type transformer has square core of 24 cm side. The hux density is 1 Wb/m. If the iron factor is 0.95, the approximately induced voltage per turn is -------- a) 6 b) 11©12 d) none of the above. -A transformer has full-load iron loss of 50 W. the iron loss at half-load will be a) 125 W b) 250 W O500 W d) none of the above. -A transformer will have maximum efficiency at----- a) full-loadpno-load c) 90% load @ none of the above - The hysteresSIS loss in a certain transformer is 40W and the eddy current loss is 50 W (both at 30HZ), then the iron loss at 50 Hz is Kef2 K. -. The flux density being the same. a) 180WO 204W c) 302 d) none of the previous. - The voltage per turn of the high voltage winding of a transformer is per turn of the low voltage winding. a) More than - the voltage the same as c) less than d) none of the previous

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.17P: The transformer of Problem 3.16 is supplying a rated load of 50 kVA at a rated secondary voltage of...

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A single-phase, 50-kVA,2400/240-V,60-Hz distribution transformer has the following parameters: Resistance of the 2400-V winding: R1=0.75 Resistance of the 240-V winding: R2=0.0075 Leakage reactance of the 2400-V winding: X1=1.0 Leakage reactance of the 240-V winding: X2=0.01 Exciting admittance on the 240-V side =0.003j0.02S (a) Draw the equivalent circuit referred to the high-voltage side of the transformer. (b) Draw the equivalent circuit referred to the low-voltage side of the transformer. Show the numerical values of impedances on the equivalent circuits.
The transformer of Problem 3.16 is supplying a rated load of 50 kVA at a rated secondary voltage of 240 V and at 0.8 posr factor lagging. Neglect the transformer exciting current. (a) Determine the input terminal voltage of the transformer on the high-voltage side. (b) Sketch the corresponding phasor diagram. (c) If the transformer is used as a step-down transformer at the load end of a feeder whose impedance is 0.5+j2.0, find the voltage VS and the power factor at the sending end of the feeder.
An infinite bus, which is a constant voltage source, is connected to the primary of the three-winding transformer of Problem 3.53. A 7.5-MVA,13.2-kV synchronous motor with a sub transient reactance of 0.2 per unit is connected to the transformer secondary. A5-MW,2.3-kV three-phase resistive load is connected to the tertiary Choosing a base of 66 kV and 15 MVA in the primary, draw the impedance diagram of the system showing per-unit impedances. Neglect transformer exciting current, phase shifts, and all resistances except the resistive load.
A single-phase 100-kVA,2400/240-volt,60-Hz distribution transformer is used as a step-down transformer. The load, which is connected to the 240-volt secondary winding, absorbs 60 kVA at 0.8 power factor lagging and is at 230 volts. Assuming an ideal transformer, calculate the following: (a) primary voltage, (b) load impedance, (c) load impedance referred to the primary, and (d) the real and reactive power supplied to the primary winding.
Consider Figure 3.4. For an ideal phase-shifting transformer, the imda nce is unchanged when it is referred from one side to the other. (a) True (b) False
For the transformer in Problem 3.10. The open-circuit test with 11.5 kV applied results in a power input of 65 kW and a current of 30 A. Compute the values for GcandBm in siemens referred to the high-voltage winding. Compute the efficiency of the transformer for a load of 10 MW at 0.8 p.f. lagging at rated voltage.
The ratings of a three-phase three-winding transformer are Primary(1): Y connected 66kV,15MVA Secondary (2): Y connected, 13.2kV,10MVA Tertiary (3): A connected, 2.3kV,5MVA Neglecting winding resistances and exciting current, the per-unit leakage reactances are X12=0.08 on a 15-MVA,66-kV base X13=0.10 on a 15-MVA,66-kV base X23=0.09 on a 10-MVA,13.2-kV base (a) Determine the per-unit reactances X1,X2,X3 of the equivalent circuit on a 15-MVA,66-kV base at the primary terminals. (b) Purely resistive loads of 7.5 MW at 13.2 kV and 5 MW at 2.3kV are connected to the secondary and tertiary sides of the transformer, respectively. Draw the per- unit impedance diagram, showing the per-unit impedances on a 15-MVA,66-kV base at the primary terminals.
Rework Problem 3.14 if the transformer is delivering rated load at rated secondary voltage and at (a) unity power factor, (b) 0.8 power factor leading. Compare the results with those of Problem 3.14. -
An open-delta three-phase transformer system has one transformer center-tapped to provide a neutral for single-phase voltages. If the voltage from line to center tap is 277 V, what is the high-leg voltage?
Reconsider Problem 3.64 with the change that now Tb includes both a transformer of the same turns ratio as Ta and a regulating transformer with a 4 phase shift. On the base of Ta, the impedance of the two comp onents of Tb is jO.1 per unit. Determine the complex power in per unit transmitted to the load through each transformer. Comment on how the transformers share the real and reactive pors.
An ideal transformer has no real or reactive power loss. (a) True (b) False
A single-phase 50-kVA,2400/240-volt,60-Hz distribution transformer is used as a step-down transformer at the load end of a 2400-volt feeder whose series impedance is (1.0+j2.0) ohm. The equivalent series impedance of the transformer is (1.0+j2.5) ohms referred to the high-voltage (primary) side. The transformer is delivering rated load at a 0.8 power factor lagging and at a rated secondary voltage. Neglecting the transformer exciting current, determine (a) the voltage at the transformer primary terminals, (b) the voltage at the sending end of the feeder, and (c) the real and reactive power delivered to the sending end of the feeder.