THESE ARE THE QUESTIONS FROM THE SUBJECT POWER SYSTEM
FUNDAMENTALS AND THE TOPIC IS MECHANICAL DESIGN OF OVER HEAD LINES
AND THE ANSWERS ARE IN BRCKETS
1) Estimate the corona loss for a three-phase, 110 kV, 50 Hz,
150 km long transmission line consisting of three conductors each
of 10 mm diameter and spaced 2·5 m apart in an equilateral triangle
formation. The temperature of air is 30ºC and the atmospheric
pressure is 750 mm of mercury. Take irregularity factor...
THESE QUESTONS ARE FROM THE SUBJECT POWER SYSTEM FUNDAMENTALS
AND FROM THE TOPIC ELECTRICAL DESIGN OF OVER HEAD TRANSMISSION
LINES AND MAKE SURE THAT YOUR ANSWER IS CORRECT
Problem-4
Find the inductance per km per phase of a 3-phase overhead
transmission line using 2 cm diameter conductor when these are
placed at the corners of an equilateral triangle of side 4
meters.
Problem-5
The three conductors of 3-phase overhead line are arranged in a
horizontal plane with a spacing of...
THESE QUESTONS ARE FROM THE SUBJECT POWER SYSTEM FUNDAMENTALS
AND FROM THE TOPIC ELECTRICAL DESIGN OF OVER HEAD TRANSMISSION
LINES AND MAKE SURE THAT YOUR ANSWER IS CORRECT
Problem-1
A single phase transmission line has two parallel conductors 1·5
meters apart, the diameter of each conductor being 0·5 cm.
Calculate line to neutral capacitance for a line 80 km long.
Problem-2
A 200 km, 3-phase transmission line has its conductors placed at
the corners of an equilateral triangle of 2·5...
1. A contractor is planning to use a crawler tractor with power
shift transmission to push 1,500 LCY. The tractor must haul the
loose material up a 12% slope where it will be stockpiled for later
removal. The contractor has measured the tractor blade load
measurement: the pile length 12.6 ft, the pile width 8.1 ft, and
the pile height 4 ft. The tractor weighs 44,400 pounds, and the
coefficient of traction is estimated to be 0.7. The average haul...
A power train application requires the coupling of a spur gear
to a transmission shaft operating at 3600RPM. The coupling must
sustain a mean torque loading of 215Nm. There is a 20% torque
ripple introduced to the drive line from the load. Select and
design a coupling system using either a keyed coupling or an
interference coupling such that the section of the transmission
shaft at that location is minimized. Assume that the gear is
located at the midpoint of...
Type an essay about "Transmission lines theory", explain with
it; transmission lines effects and their causes, then state the
difference between the propagation of electromagnetic waves in such
structures and the propagation in an unbounded space, like free
space
Your essay should not exceed one page
Write about wireless transmission and explain how’s the
transmission is occurred, what are the current technologies is
applied to such systems and its conclusion
True or False
1. Shafts utilized for constant power transmission with no
supported components may be designed using static failure
theory.
2. Slope and deflection of shafts are constrained to ensure
proper functionality of the supported components
3. For a given bending moment loading and length, a shaft with
smaller diameter will result in smaller angular deflection at the
bearing supports.
4. For a shaft subjected to combined variable bending and
constant torsional loading, the shaft diameter at the critical...