Answer the following problems in a short/long bond paper size. Round off your answer up to 2decimals, if applicable. Show your complete solution and box your final answer.You may not copy the problem.1. Two properly connected wattmeters are used to measure the power drawn by a 440 Vsquirrel-cage induction motor. If the wattmeters read 60 kW and 32 kW, find the linecurrent drawn by the motor.2. A 3-phase feeder carries two lagging balanced loads. The power drawn in each ismeasured by a standard two wattmeter method, giving the following readings: First load:W; = 160 kW; W2 = 96 KW and second load: W. = 90 kW; W; = 48 KW. Find the totalkVA load on the feeder.3. Two-wattmeter method is used to test a 25 hp, 230 V, 1800 rpm, 60 Hz, 3-phaseinduction motor. If the readings of the wattmeters are 13,400 Ww and 7,400 W, find thepower factor of the load.4. The input power to a 3-phase induction motor running without a load is measured by atwo wattmeter method. One wattmeter reads -220 W and the other reads 940 W. Findthe no-load power factor of the motor.5. A 460 V, 3-phase motor draws 208 A with a pf of 0.91 lagging. Find the readings of twowattmeters properly connected to measure the total power drawn by the motor.

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Answered: 1. Two properly connected wattmeters…

1. Two properly connected wattmeters are used to measure the power drawn by a 440 V squirrel-cage induction motor. If the wattmeters read 60 kW and 32 kW, find the line current drawn by the motor.

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 3.33P: Consider the three single-phase two-winding transformers shown in Figure 3.37. The high-voltage...

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Concept explainers

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.

Question

Answer the following problems in a short/long bond paper size. Round off your answer up to 2
decimals, if applicable. Show your complete solution and box your final answer.
You may not copy the problem.
1. Two properly connected wattmeters are used to measure the power drawn by a 440 V
squirrel-cage induction motor. If the wattmeters read 60 kW and 32 kW, find the line
current drawn by the motor.
2. A 3-phase feeder carries two lagging balanced loads. The power drawn in each is
measured by a standard two wattmeter method, giving the following readings: First load:
W; = 160 kW; W2 = 96 KW and second load: W. = 90 kW; W; = 48 KW. Find the total
kVA load on the feeder.
3. Two-wattmeter method is used to test a 25 hp, 230 V, 1800 rpm, 60 Hz, 3-phase
induction motor. If the readings of the wattmeters are 13,400 Ww and 7,400 W, find the
power factor of the load.
4. The input power to a 3-phase induction motor running without a load is measured by a
two wattmeter method. One wattmeter reads -220 W and the other reads 940 W. Find
the no-load power factor of the motor.
5. A 460 V, 3-phase motor draws 208 A with a pf of 0.91 lagging. Find the readings of two
wattmeters properly connected to measure the total power drawn by the motor.

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