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Q. Characteristics of Transformer?
The characteristics of most interest to power engineers are voltage regulation and ef?ciency. The voltage regulation of a transformer is a measure of the change in the magnitude of the secondary voltage as the current changes from no load to full load while the primary voltage is held ?xed. This is de?ned as
in which the I2R loss is obviously load-dependent, whereas the core loss is considered to be constant and independent of the load. It can be shown that the core loss should be equal to the copper loss for maximum operating ef?ciency at a given load.
The rated core loss can be approximated by the power input in the open-circuit test in which one winding is open-circuited and rated voltage at rated frequency is applied to the other winding.
The rated copper loss (at full load) can be approximated by the power input in the short-circuit test, in which one winding is short-circuited and a reduced voltage at rated frequency is applied to the other winding such that the rated current results.
The energy ef?ciency generally taken over a 24-hour period, known as all-day ef?ciency,is also of interest. It is given by
Externally Initiated Signals Other than interrupt there are followings externally initiated signals available in 8085 microprocessor.
Alternate Representation for Complex Poles Complex poles can be combined to yield a quadratic term in the partial fraction expansion. The representation may best be illustrated
Explain the operation of 8279. Explain the following terms: (i) N key Roll over. (ii) Key board debounce. (iii) FIFO RAM. Ans The 8279 microprocessor i
Q. Show limitations of microprocessor-based control systems? Practical limitations of microprocessor-based control systems stem from the following considerations: • Finite-w
Register to Register This instruction is used to copy data from the source register to the destitution register. The previous contents on the destination register wil
1. The photon fluence rate is 10 7 photons mm -2 sec -1 for a beam of γ rays. One fourth of the photons have energies of 100 keV, one half have energies of 80 keV and the remain
One of the simplest circuits is the asynchronous or ' ripple' counter. Below is shown the circuit diagram of a simple 3 stage ripple counter. The operation of this circuit
A three-phase, 5-hp, 220-V, six-pole, 60-Hz in- duction motor runs at a slip of 0.025 at full load. Rotational and stray-load losses at full load are 5% of the output power. Calcul
Q. What do you mean by Oscilloscope? To measure time-varying signals (voltages and currents), an instrument known as an oscilloscope is employed. It can be used as a practical
Explain temperature dependence of electrical resistivity and conductivity in semiconductors. The electrical conductivity of the semiconductors changes considerably with temper
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