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Q. A four-pole dc generator is lap wound with 326 armature conductors. It runs at 650 r/min on full load, with an induced voltage of 252 V. If the bore of themachine is 42 cmin diameter, its axial length is 28 cm, and each pole subtends an angle of 60°, determine the air-gap flux density. (Note that the number of parallel paths is equal to the number of poles for lap windings.)
Q. What is a heat sink? List the factors, which determine its efficiency. To reduce the chance of thermal runaway, the rise of temperature at the collector junction to a danger
Q. Ac measurements with constant voltage amplitude reveal that the total core loss of a certain magnetic circuit is 10 W at f = 50 Hz, and 13 Wat f = 60 Hz. Find the total core los
whatis motor protection
when i/p voltg is grater than battery diode is clse or open
Explain the Power Transmission Lines Transmission and distribution of electric power is accomplished by using overhead lines or underground cables. Overhead lines are normally
Q. How oscillations start up in an oscillator? The noise voltage produced due to the random motion of electrons in resistors or in active devices provides the starting voltage
explain appropriate first aid procedure to be followed in case of electric shock
Electrical energy If the power is measured in watts and the time in seconds then the unit of energy is watt- seconds or Joules.
POP Instruction This instruction copies the contents of the top two locations of the stack into the specified register pair. The contents of stack pointer register are
Unconditional Return RET Instruction: This instruction is used to transfer the program sequence from subroutine to the calling program unconditionally. The instruction forma
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