Question

In: Electrical Engineering

a three-phase bipolar motor of 10.72 [HP] has an efficiency of 80% when working at full...

a three-phase bipolar motor of 10.72 [HP] has an efficiency of 80% when working at full load at 2700 (rpm), if it is connected to a network of 440 (V) at 50 [Hz] calculate

a.) The synchronous motor speed in (rpm)
b.) Engine displacement.

c.) rotor frequency at full load.

d.) If the kilowatt hour costs $ 185.39. The money saved in energy consumption if the engine works continuously for three years and is replaced by an engine with 97% efficiency?

Solutions

Expert Solution

Manojponduru answered 7 months ago
Next > < Previous

Related Solutions

1. three-phase induction motor rated 250 hp, 0.7 pf and 80% efficiency. Determine the minimum size...
1. three-phase induction motor rated 250 hp, 0.7 pf and 80% efficiency. Determine the minimum size in kVAR of a capacitor needed to prevent overloading the transformers.Two single-phase transformers each rated 150 kVA are connected open delta supplying a 2. A 2.2 kV, 200 hp, delta- connected, 3 phase synchronous motor is operating on full load at an efficiency of 0.88 and pf of 0.8 leading. The armature has a reactance per phase of 5 ohms and negligible resistance. Solve...
A three phase synchronous motor is Y-connected with the following values: 2.3 kV, 400 hp, 60...
A three phase synchronous motor is Y-connected with the following values: 2.3 kV, 400 hp, 60 Hz, 8 poles with a rated pf of 0.85 leading. It is 90% efficient at full load with an armature resistance of 0.80 Ohms and synchronous reactance of 11 Ohms. At full load calculate the output torque, and internal generated voltage (EA)
A three phase 30 hp 460 volt 60 hz, 1770 rpm design B induction motor with...
A three phase 30 hp 460 volt 60 hz, 1770 rpm design B induction motor with class F insulation and service factor of 1.0 is operating at rated shaft load in a 40 degree C environment and has an expected 20 yr life. A maintenance check shows line to line voltages to be 449.2 V, 431.3 V and 462.4 volts. The percent unbalanced voltage for this motor is: the expected temperature rise equals? The expected insulation life equals? the rerating...
A motor apply power 10-hp split-phase motor speed at 1700 rpm is used to drive a...
A motor apply power 10-hp split-phase motor speed at 1700 rpm is used to drive a rotary pump, which operates 24 hours per day. An engineer has specified a 7-in small sheave, an 10-in large sheave, and three C112 belts. The service factor of 1.2 was augmented by 0.1 because of the continuous-duty requirement. Analyze the drive and estimate the belt life in passes and hours.
A 400V, 50 Hz , 80 hp eight pole Δ connected synchronous motor has a reactance...
A 400V, 50 Hz , 80 hp eight pole Δ connected synchronous motor has a reactance of 0.6 and negligible armature resistance. Its friction, windage and core losses are 1.2KW, 0.5KW and 1KW respectively . What is the speed of this motor? If this motor is initially supplying rated hp at 0.82 PF lagging . What are the magnitudes and angles of ? What is the power factor of the motor? How much induced torque and load torque is produced...
A single- phase full- wave rectifier is used to control the speed of a 5- hp,...
A single- phase full- wave rectifier is used to control the speed of a 5- hp, 110- V, 1200- rpm, separately- excited dc motor. The converter is connected to a single- phase, 120- V, 60- Hz supply. The motor has a winding resistance of 0.4ohms and an inductance of 5 mH, and a voltage constant K=0.09V/rpm. a. During the motoring operation, the motor runs at 1000 rpm and receives an armature current of 30 A. Determine the corresponding firing angle...
A standard electric motor is rated at 10 horsepower (HP) and costs $800. Its fullload efficiency...
A standard electric motor is rated at 10 horsepower (HP) and costs $800. Its fullload efficiency is specified to be 87%. A newly designed, high efficiency motor of the same size has an efficiency of 93%, but costs $1,200. It is estimated that the motors will operate at a rated 10-HP output for 2,500 hours a year, and the cost of energy will be $0.07 per kilowatt-hour. Each motor is expected to have 12-year life. At the end of 12...
A standard electric motor is rated at 10 horsepower (HP) and costs $800. Its fullload efficiency...
A standard electric motor is rated at 10 horsepower (HP) and costs $800. Its fullload efficiency is specified to be 92%. A newly designed, high efficiency motor of the same size has an efficiency of 95%, but costs $1,200. It is estimated that the motors will operate at a rated 10-HP output for 2,000 hours a year, and the cost of energy will be $0.07 per kilowatt-hour. Each motor is expected to have 12-year life. At the end of 12...
A three phase engine has an usable power of 90 kW and an efficiency of 91%....
A three phase engine has an usable power of 90 kW and an efficiency of 91%. The rating plate indicates the following values: - 90 kW - Power factor: 0.89 (i) - Voltage (volts): 230 delta - 400 wye Taking as a reference of line voltages V1=V∠90º; direct sequence and a phase oltage of the supply network of 230 V, find: a) The phasors of the line and phase voltages of the supply network b) The true, reactive and apparent...
The efficiency of a 400-kVA, single-phase, 60-Hz transformer is 98.77% when delivering full-load current at 0.8...
The efficiency of a 400-kVA, single-phase, 60-Hz transformer is 98.77% when delivering full-load current at 0.8 power factor, and 99.13% with half-rated current at unity power factor. calculate: (a) The iron loss. (b) the full-load copper loss. (c) the efficiency at 3/4 load, 0.9 power factor
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT