Electrical Engineering Answers

What is the equation relating temperature and resistance for an RTD calibrator?

How can i ensure that the temperature inside the calibration unit was the temperature required?

The density of copper is 3 3 8.93 10 / kg m . Calculate the number of free electrons per
cubic meter and hence their drift velocity when a current is flowing whose density is 21 / A cm . Take Avogadro’s number as 23 6.022 10 / atoms mole and the molar mass of cupper is 63.55g.

A small motor rated at 50 Va, 120 V and with a power factor of 0.65 lagging.
a) Determine the current of the motor.
b) What is the capacitance of the capacitor to be connected across the motor to make the power factor 0.94?
c)What will be the line current upon the addition of the capacitor?

What is the difference in construction and action between a poppet valve and a spool valve?

Which parameters of an op-amp become significant for a fast varying ultra low input voltage signal? What should be the values of these parameters for a triangular wave
signal of ±5 mV peak to peak with 50 MHz frequency given to a unity gain op-amp amplifier?

Suppose that Vmax value read from the graticule on an oscilloscope screen is 4.6 divisions and Vmin is 0.7 divisions. Calculate the modulation index and percentage of modulation.

A direct motor is developing 90.6kW at a speed of 2000r/min. The motor is connected to a 480V supply. The cost of electrical energy is 45.4c/kWh and the efficiency of the motor is 86.4%. Calculate the torque available at the shaft of the motor

A 100-kW, 250-V DC shunt generator has an armature resistance of 0.05Ω. With the generator operating at rated voltage, determine the induced voltage at full load.

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