A 100-kVA, 2500/125-V, 50-Hz, step-down transformer has the following parameters: R1= 1.5Ω, X1= 2.8Ω, R2= 15mΩ, X2=20mΩ, Rc1= 3kΩ, Xm1= 5kΩ The transformer delivers 85% of the rated load at a terminal voltage of 115 V and a power factor of 0.866 lagging. Determine (a) the efficiency, and (b) the voltage regulation.  Draw the phasor diagram of the transformer. Use the approximate equivalent circuit referred to the secondary side.

The symbol shown is a(n) a. iron core transformer. b. auto transformer. c. current transformer. d. air core transformer.

All values of a transformer are proportional to its __________________ ___________________.

A single-phase step-down transformer is rated 13MVA,66kV/11.5kV. With the 11.5 kV winding short-circuited, rated current flows when the voltage applied to the primary is 5.5 kV. The power input is read as 100 kW. Determine Req1andXeq1 in ohms referred to the high-voltage winding.

A single-phase, 50-kVA,2400/240-V,60-Hz distribution transformer has the following parameters: Resistance of the 2400-V winding: R1=0.75 Resistance of the 240-V winding: R2=0.0075 Leakage reactance of the 2400-V winding: X1=1.0 Leakage reactance of the 240-V winding: X2=0.01 Exciting admittance on the 240-V side =0.003j0.02S (a) Draw the equivalent circuit referred to the high-voltage side of the transformer. (b) Draw the equivalent circuit referred to the low-voltage side of the transformer. Show the numerical values of impedances on the equivalent circuits.

An ideal transformer has no real or reactive power loss. (a) True (b) False

How do i calculate secondary current in transformer analysis

A 400/800 ratio transformer has secondary winding resistance of 0.5 ohm. What is the total resistance in ohmsreferred to primary?

Which of the following are power losses that can occur in a practical transformer (non-ideal)? copper loss O loss due to eddy currents V hysteresis loss O voltage drop due to coil material

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