QUESTION 4 Which listed term is used to describe the pressure required at the inlet of a centrifugal pump to avoid vapor formation and cavitation at the pump impeller? O a. Hydrostatic Head O b. Suction Pressure O C. Net Positive Suction Head O d. Shutoff Head

Consider a ferromagnetic ring (nucleus) that has a mean circumference of 40 cm, 300coiled copper turns and a sectional area of 5 cm2. A current of 2 is appliedA to winding, producing a flux of 1.5 mWb.Determine the permeability of the core material.Determine the relative permeability of the core material.If the ferromagnetic ring has an air gap of 2 mm. Find the required MMFso that the flux density in the gap is 0.5 T.

Make sure you indicate clearly the questions attempted Show your work to earn marks. • Enjoy Q1. With the help of a well-drawn diagram, explain concept map of an electromechanical system modelling. [20] Q2. Separately-excited generator develops a no load emf of 150V at an armature spend of 20 rev/s and a flux per pole of 0.1 Wb. determine the generated emf when a. The spend increases to 25rev/s and the pole flux remains unchanged. b. The speed remains at 20 rev/s and the pole flux is decreased to 0.08Wb. c. The speed increases to 24 rev/s and the pole flux is decreased to 0.07 Wb Write short notes on the following term a. Copper loss b. Iron loss c. Friction and Windage losses. [20]

Explain the concept of reactive power control and its role in maintaining the voltage stability of a power system.

(B)-Explain by drawing the change in the direction of current flows through coils at the ideal case of commutation by considering coil B which is the coil under commutation as shown in the figure below. B C 5A SA 5A Armature winding 10 A Commutator 10 A Brush

What is the significance of reactive power in a power system, and how is it controlled to maintain system stability?

Question 43

Solve it quickly please