Which is the correct formula for the depth and height of the yoke for stepped core?
What is the formula for the depth and height of the yoke for stepped core? Explanation: The depth of the yoke of stepped core is equal to the width of the largest stamping. The height of the yoke for the stepped core is also equal to the width of the largest stamping. 2.
What is the formula for window area of transformer?
Window area available (awa) = 10.891 cm² Core number = 16. Stack Height = gca / atw = 21.99 / 3.810 = 5.774cm.
What is the range of the ratio of depth to width of core in rectangular core?
8. What is the range of the ratio of depth to width of core in rectangular core? Explanation: In rectangular core, the ratio of the depth to core should be minimum 1.4. The maximum value of ratio of depth to core is 2.
What are the main dimensions of core type transformer?
In core type transformer the ratio of depth to width of core varies between 1.4 to 2. In shell type transformer width of central limb is 2 to 3 times the depth of core. Square and stepped cores: For high voltage transformers, where circular coils are required, square and stepped cores are used.
What is the formula for the height of the window Mcq?
height = height of the window + (2*height of the yoke) is the height of the single and three phase core type transformers. 6.
What is the formula for number of tubes?
Solution: The surface area per tube will be: Sa = πDL = π (3/12) (10) ft² = 7.854 ft² – (D – tube diameter in ft). The number of tubes required would thus be: n = 178.7 ft² = 22.7 tubes (23 or 24 tubes).
What is the formula for width of the tank for single phase transformers used?
11. What is the formula for width of the tank for single phase transformers used? Explanation: Width of tank = 2*distance between adjacent limbs + external diameter of h.v windings + 2*clearance between h.v windings and tank is the formula for three phase transformer.
What is K in single phase transformer?
The transformation ratio of the transformer may be defined as the ratio of the secondary voltage to the primary voltage of the transformer. It is denoted by K. … And V2, E2, N2 are output voltage, induced EMF, winding turns of secondary winding respectively.
What is the transformer formula?
Vp=−NpΔΦΔt V p = − N p Δ Φ Δ t . This is known as the transformer equation, and it simply states that the ratio of the secondary to primary voltages in a transformer equals the ratio of the number of loops in their coils.
What is the formula for brush contact loss of dc machines?
Brush friction loss = (Coefficient f friction) * Brush Pressure * Area of the brush*Commutator voltage. Sanfoundry Global Education & Learning Series – Design of Electrical Machines. To practice all areas of Design of Electrical Machines, here is complete set of 1000+ Multiple Choice Questions and Answers.
What is the formula for MMF for air gap?
According to the formula (3), the total value of MMF of the magnetic circuit is FΣ1=430+2·36+2·51+180+3,9=788 А. The saturation coefficient of the magnetic circuit is the ratio of the total MMF of the magnetic circuit FΣ to the total value of MMF of the magnetic circuit in the air gap Fδ.