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Category: electrical machines

solved questions on electrical machines

Anonymous

Asked: October 6, 2022In: electrical machines

Problem 2 An engineer has used discrete operational amplifiers to build the instrumentation amplifier depicted in Figure 2. Assume 𝑅1 = 49.5 kΩ , 𝑅2 = 𝑅3 = 𝑅𝐺 = 1 kΩ

Anonymous

Asked: October 6, 2022In: electrical machines

Problem 1 To amplify the voltage produced by a resistive-sensor circuit, an engineer has proposed the circuit depicted in Figure 1. Assuming that the operational amplifier is ideal, determine a symbolic expression for 𝐯𝐎𝐔�

Anonymous

Asked: August 29, 2022In: electrical machines

The electromagnet shown in Fig. P1.8 can be used to lift a length of steel strip. The coil has 500 turns and can carry a current of 20 amps without overheating. The magnetic material has neg- ligible reluctance at flux densities up to 1.4 tesla. Determine the maximum air gap for which a flux density of 1.4 tesla can be established with a coil current of 20 amps. Neglect magnetic leakage and fringing of flux at the air gap.

Anonymous

Asked: August 29, 2022In: electrical machines

Two coils are wound on a toroidal core as shown in Fig. P1.4. The core is made of silicon sheet steel and has a square cross section. The coil currents are i1 = 0:28 A and i2 = 0:56 A. (a) Determine the flux density at the mean radius of the core. (b) Assuming constant flux density (same as at the mean radius) over the cross section of the core, determine the flux in the core. (c) Determine the relative permeability, μr, of the core. Problems 31

Anonymous

Asked: August 29, 2022In: electrical machines

In the magnetic system of Fig. P1.2 two sides are thicker than the other two sides. The depth of the core is 10 cm, the relative permeability of the core μr = 2000, the number of turns N = 300, and the current flowing through the coil is i = 1 A. (a) Determine the flux in the core. (b) Determine the flux densities in the parts of the core.

Anonymous

Asked: August 29, 2022In: electrical machines

The long solenoid coil shown in Fig. P1.1 has 250 turns. As its length is much greater than its diameter, the field inside the coil may be considered uniform. Neglect the field outside. (a) Determine the field intensity (H) and flux density (B) inside the solenoid (i = 100 A). (b) Determine the inductance of the solenoid coil.