A 3-phase 66/11kV star-delta connected transformer is protected by Merz-price system. The CTs on low tension side have a ratio of 420/5A. Find the ratio of the CTs on the high tension side.

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

Which of the following ziegler nichols tuning methods the response of the controller to a step input should exhibit an s-shaped curve? a)-open loop mode b)-closed loop mode c)-both modes (open & closed) d)-none of the modes (open & closed)

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.