Determine the V/H ratio when frequency changes and the voltage is constant.

List the reasons for using AC drives to control the speed of AC motors.Explain the methods of controlling the speed of an AC motor and identify which one is most effective. Describe the purpose of the following sections of an AC drive:

Operator Control               Drive Controller                         AC Motor

Explain the differences among volts/Hz, AC closed-loop vector, and sensorless vector control methods. Describe the operation of the following major sections of the VAC drive:

Converter     Intermediate               Circuit Inverter

Determine the V/H ratio when frequency changes and the voltage is constant.Describe the operation of the flux vector drive.


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Calculate the maximum achievable bridge out-of-balance voltage for an applied torque T of 103 N m given the following

Four strain gauges, with specification given below, are available to measure the torque on a cylindrical shaft 4 cm in diameter connecting a motor and load. (a) Draw clearly labelled….

Find the gain and phase characteristics of the maintaining amplifier.

A solid-state capacitive humidity sensor has a capacitance given by: C = 1.7 RH + 365pF where RH is the percentage relative humidity. The sensor has an associated parallel resistance….

calculate the mean velocity of the gas at maximum flow rate

A pitot tube is used to measure the mean velocity of high pressure gas in a 0.15 m diameter pipe. At maximum flow rate the mean pitot differential pressure is….