4. The armature of a 6-pole separately excited dc generator is triplex wave wound with 534 conductors. This machine delivers power to the load at 200V while being driven at 90Orpm. At this load, the armature circuit dissipates 640W. If the flux of this generator is 180-mWb, determine the kW rating of the load served. Assume a total brush drop of 2V. 0.46 kW

4. The armature of a 6-pole separately excited dc generator is triplex wave wound with 534 conductors. This machine delivers power to the load at 200V while being driven at 90Orpm. At this load, the armature circuit dissipates 640W. If the flux of this generator is 180-mWb, determine the kW rating of the load served. Assume a total brush drop of 2V. 0.46 kW

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter10: Heat Exchangers

Section: Chapter Questions

Problem 10.19P

See similar textbooks

Similar questions

A 10,000 KW run-of-river hydro-electric plant has an available head of 200 ft and has an overall efficiency of 90% that remains constant for all loads. For a given day during the low-water season the customers receiving primary power have the following loads: 8000KW for 2 hrs, 6000 KW for 2 hours, 4000 KW for 10 hrs, 2000 KW for 10 hrs. For a river flow remaining onstant at 525 ft/s, how much secondary power could this plant provide during the entire day?
A Carnot engine uses nitrogen as the working fluid. The heat supplied is 53 kJ and the adiabatic expansion is 16:1. The receiver temperature is 295 K. Determine network.
A CSP supercritical steam power plant using a concentrating collector arrayfor DSG (refer to Figure 8.12) is operating under the following conditions:• Plant electric power output Pel = 28 MW• Intensity of beam solar radiation incident on the concentrator apertureIbc = 798 W/m2• Aperture area of a single concentrator module Aap = 420 m2• Efficiency of the collector ηc = 0.7• Power plant thermal efficiency ηth = 0.39• Efficiency of the electric generator ηg = 0.97• HTF is water/steam• Superheated steam condition at the absorber outlet/turbine inlet:ps = 250 bars, ts = 600°C• Feedwater temperature at the absorber inlet = tw = 280°C Calculate (i) the power plant overall (electrical) efficiency, (ii) the thermal capacity of the power plant, (iii) the rate of useful heat output of aDSG collector module, (iv) the number of concentrator modules, and (v) the steam generation rate of the solar collector.
27.) A 13-V storage battery delivers current at the rate of 50 A. In a 27-min period, the heat lost from the battery is 92.74 kJ. What is the change in internal energy in kJ of the battery for the discharging period?
A.) A power plant is said to have a plant use factor of 48.5% and a plant capacity factor of 42.4%. How many hours did it operate during the whole year? B.)A central station has annual factors as follows; Load Factor 58.5%; Plant Capacity factor 40.9%; Plant Use Factor 45.2%. The reserve carried over and above the peak load is 8900kW. Find annual energy production in kW-hr
An ROR hydroelectric power plant is operating under the following conditions:• Plant capacity factor CF = 0.75• Rate of water flow in the turbine Q = 42 m3/s• Water flow velocity v = 12 m/s• Plant electrical efficiency ηel = 0.9 Determine (a) the plant electric power output Pel, and (b) the annual power generation Eyr of the plant.
[4] A multi-storied shopping mall has installed 5 x 110 TR reciprocating compressors of which four compressors are in use and fully loaded for 14 hours per day. The specific power consumption of reciprocating compressor is 0.8 kW/TR. Due to higher energy cost the shopping mall chief engineer has decided to replace reciprocating compressors with screw compressors having specific power consumption of 0.65 kW/TR. The chief engineer needs thefollowing input from energy consultant: • Comparison of power and electricity consumption of both reciprocating and screw compressors?
An ice plant produces 10 tons of ice per day at 0°C using water at room temperature of 33°C. Estimate the power rating (Electrical Power consumed by the motor to run compressor) of the compressor-motor, if the C.O.P. of the plant is 3.0 and overall electro-mechanical efficiency (η) is 91%. Note: Latent heat of ice is 335 kJ/kg, Cp = 4.18 kJ/kg.K.
If the frequency of the pump is halved, what will happen to the power consumed? P0 = initial power consumption A. 1/8 P initial B. 2 P initial C. 1/4 P initial D. 4 P initial
A geothermal power plant has a brake power of 20 MW, combined efficiency of 80%, and mechanical efficiency of 80%. The pressurized groundwater at 175 bar and 280 degrees Celsius leave the wells to enter the flash chamber maintained at 14 bar. The steam collected enters the turbine a 14 bar and exhaust at 1 atm. If one well discharges 180000 kg/hr of hot water, compute the combined work in kW.
A mining company depleted more than half of its ore reserves and is no longer using all of its shaft infrastructure. It considers using one of the old shafts for pumped-storage hydro-electricity generation. This means that water will be pumped to the higher level, which is 1 000 m above the bottom level, at night when Eskom charges lower, off-peak, rates. The “higher level” will be changed into a dam (reservoir) by means of plugs that will be installed in some tunnels. The stored water has potential energy, which will be used to generate electricity for the mine at peak hours, when electricity is expensive. The pump that will be installed at the bottom of the column will also be used as a turbine for the generation of electricity The pump-as-turbine (PAT) must pump water to a height of 1 000 m through a column with an internal diameter (ID) of 345 mm. 3.1. Calculate the velocity of the water in the pipe if the quantity of water to be pumped is 220 litres per second (lps). 3.2.…
During winter, a mechanical heat pump is turned on to supply heat to a house, which is maintained at 18°C. The wall of this house is not perfectly insulated and estimated to have heat loss at a rate of 140,000 kJ/h. The house has electrical appliances that are always turn on, and generate heat at a rate of 27,000 kJ/h. Assume that the mechanical heat pump is reversible and the outdoor temperature is 2°C. List the necessary assumption, sketch the appropriate schematic to visualize the process and calculate the coefficient of performance (COP) for this mechanical heat pump.[Semasa musim sejuk, suatu