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IEEE (4th sem) chp 3
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Terms in this set (120)
_______ does not change in transformer
frequency
in transformer the energy is conveyed from primary to secondary
by flux
a transformers core is laminated to
reduce the eddy current loss
the no-load current drawn by the transformer is usually what percent of full load current ?
2 to 5 %
the path of magnetic flux in a transformer should have
low reluctance
no-load on a transformer is carried out to determine
magnetising effect and loss
the dielectric strength of the transformer oil is expected to be
33KW
sumpners test is carried out in an transformer to determine the
temperature
the permissible flux density in case of cold rolled grain oriented steel is around
1.7 Wb / m^2
the efficiency of an transformer will be maximum when the
copper losses = iron losses
no load current in an transformer
lags behind in voltage by 75 degree
The purpose of an iron core in an transformer is
To decrease the reluctance of the magnetic path
_______ is not a part of the transformer installation
Exciter
While conducting the short circuit test on a transformer the following side is short circuited
The low voltage side
In an transformer _________ side winding has got more cross sectional area
Low voltage side
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Verified questions
ENGINEERING
Consider atmospheric air at $25^{\circ} \mathrm{C}$ and a velocity of 25 m/s flowing over both surfaces of a 1-m-long flat plate that is maintained at $125^{\circ} \mathrm{C}$. Determine the rate of heat transfer per unit width from the plate for values of the critical Reynolds number corresponding to $10^{5}$, $5 \times 10^{5}$, and $10^{6}$.
ENGINEERING
A 110-V electric water heater warms 0.1 L/s of water from 18 to 30$^\circ{}$C. Calculate the current in amperes that must be supplied to this heater. Answer: 45.6 A
ENGINEERING
Consider the flow of oil with $ho = 894 kg/m^3$ and $\mu = 2.33 kg/m\cdot s$ in a 28-cm-diameter pipeline at an average velocity of 0.5 m/s. A 330-m-long section of the pipeline passes through the icy waters of a lake. Disregarding the entrance effects, determine the pumping power required to overcome the pressure losses and to maintain the flow of oil in the pipe.
ENGINEERING
The roof of a house consists of a 15-cm-thick concrete slab $(k=2 \mathrm{W} / \mathrm{m} \cdot \mathrm{K})$ that is 15 m wide and 20 m long. The convection heat transfer coefficients on the inner and outer surfaces of the roof are 5 and $12 \mathrm{W} / \mathrm{m}^{2} \cdot \mathrm{K},$ respectively. On a clear winter night, the ambient air is reported to be at $10^{\circ} \mathrm{C},$ while the night sky temperature is 100 K. The house and the interior surfaces of the wall are maintained at a constant temperature of $20^{\circ} \mathrm{C}.$ The emissivity of both surfaces of the concrete roof is 0.9. Considering both radiation and convection heat transfers, determine the rate of heat transfer through the roof, and the inner surface temperature of the roof. If the house is heated by a furnace burning natural gas with an efficiency of 80 percent, and the price of natural gas is $1.20/ therm (1 therm = 105,500 kJ of energy content), determine the money lost through the roof that night during a 14-h period.
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