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1. Explain the difference between rotor speed and rotor frequency. For s = -0.01 and a rotor speed of 1740 rpm, what is the rotor frequency for a 60 Hz induction generator?
2. Explain why the efficiency of an induction generator can be smaller when working as an asynchronous motor under certain conditions.
3. Calculate the efficiency of a 110 V, 60 Hz induction generator connected directly to the grid with the following parameters: Rm = 36.2 Ω; losses equal to 0.8% of the rated power; s = -0.03; R1 = 0.2 Ω; R2 = 0.15 Ω; X1 = 0.42 Ω; X2 = 0.43 Ω.
the velocity of a particle is given by v16t2i 4t3j 5t 2k ms where t is in seconds. if the particle is at the origin
Determine the force in member CG of the loaded truss, repeated here from Prob. 4/27. The four external reactions at A, B, E, and F are equal in magnitude and are directed perpendicular to the local suppporting surfaces.
If the spacing is 10 mm and the glass surfaces in contact with the air have temperatures of 10°C and 15°C, what is the rate of heat loss from a 1 m × 2 m window? The thermal conductivity of air is ka = 0.024 W/m · K.
the tension in the string attached to 0"50 kg.
Heat is generated uniformly in the fuel rod of a nuclear reactor. The rod has a long, hollow cylindrical shape with its inner and outer surfaces at temperatures of Ti and To, respectively. Derive an expression for the temperature distribution.
A given mass flow rate (.17 kg/min) of an ideal gas flows through an adiabatic compressor operating at steady state. The compressor has an adiabatic efficiency of N(%) = 87.5. The gas has a molecular weight of MW = 28.5 (kg/kmol) and a specific heat ..
the displacement function ux for a tensile specimen of uniform cross section and length l fixed at one end and
Assume the bearing simply support the shaft, such that the bearings apply forces to the shaft but no moments. All dimensions are in mm
A one dimensional wall of material (Kw=10w/mk) is 50 mm thick with uniform heat generation q‘‘‘=5*10^6w/m^3. The left side is exposed to a fluid hl=500w/m^2k at 20 degree Celsius. The right side has a 10mm thick plate attached that has no heat genera..
a nylon thread is to be subjected to a 10-n tension. knowing that e 3.2 gpa that the maximum allowable normal stress
Steam is throttled from 9 MPa and 500V to a pressure of 7 MPa. Determine the decrease in exergy of the steam during this process. Assume the surroundings to be at 25C.
Over time, coal slag will accumulate on the combustion side of the boiler tubes. This fouling processincreases the hot side resistance to Rt,h = 9 X 10-8 K/W.
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