Power Engineers Window

  Answer                                                    Length Actual Resistance R = ρ ×   --------------                                                    Area   But length and cross section area is not specified   Actually length is the dimension along the direction of current and area is across the direction of current.   Therefore there are three possibilities depending upon the direction of the current as under.     ...

  Conductor Resistance   A piece of conducting material having specific resistance ρ has dimensions as per drawing Calculate its actual resistance R in term of ρ, X, Y, Z. ANSWER

  Answer Current I 1   is  R-phase  current which is  5 Amps . Current I 2  is sum of current of  R-phase  &  Y-phase . They are 5 Amps each but 120 degree apart. Vector sum of these two is also  5 Amps  as shown hereunder in vector diagram. Current I 3   is sum of currents in  B-phase  &  Current I 2   (Sum of  R-phase  &  Y-phase) . As these current are equal and opposite, vector sum is zero.                  Vector Diagram                   Ultimtely                              I 1  = 5 Amps                  I 2  = 5 Amps                  ...

  Fridge in Room There is a room perfectly heat sealed so that transfer of heat from room to outside or from outside to room is not possible. Temperature sensor is provided in the room to monitor room temperature from outside. One fridge is also in the room.   As experiment, the room is closed after switching ON fridge with its door open.   Room temperature is observed after about ten hours running of fridge with its door open in this closed room.   There are three probabilities. Either room temperature will  INCREASE   or  DECREASE  or  NO CHANGE.   What is expected and Why? Answer Readers, Quiz is a mental exercise to enhance reasoning power in the subject. Hence personal attempt for reply is expected before jumping to answer. Answer given here is just for confirmation. Proceed There is no scope for the heat to enter or leave the room as room is closed and sealed. One assumption may be cooled air from...