# DC Machines & Transformer

## Parallel Operation of Two 1-ph Transformers to Determine the Sharing of Load Current, Apparent and Real Power

Experiment No.: 6(B) Experiment Name: Parallel Operation of Two 1-ph Transformers to Determine the Sharing of Load Current, Apparent and Real Power. Objective: To perform parallel operation of two 1-ph transformers To determine the sharing of load current, apparent power and real power Theory: Parallel operation of transformers is used for load sharing. The transformers …

## Polarity Test for Operation of Two Single Phase Transformers in Parallel

Experiment No.: 6(A) Experiment Name: Polarity Test for Operation of Two Single Phase Transformers in Parallel. Objective: To test polarity of two single phase transformers. Theory: We do polarity test on parallel transformers to ensure that we connect the same polarity windings and not the opposite ones. If we accidentally connect the opposite polarities of …

## Regulation & Efficiency Test of Single-phase Transformer by Direct Loading Method

Experiment No.: 5 Experiment Name: Determine the regulation & efficiency of single-phase transformer by direct loading method. Objective: To determine Regulation of single-phase transformer by direct loading method Efficiency of single-phase transformer by direct loading method Theory: Although two chief difficulties which do not warrant the testing of large transformer by direct load test are: …

## Short Circuit Test of Single Phase Transformer

Experiment No.: 4(B) Experiment Name: Determination of equivalent circuit parameters of single-phase transformer by performing Short Circuit test Objective: The objective of the experiment is to find out Copper loss at any load Different parameters of the transformer with respect to high voltage side & low voltage side (i.e. equivalent resistance, equivalent impedance etc.), with …

## Open Circuit Test of Single Phase Transformer

Experiment No.: 4(A) Experiment Name: Determine Equivalent Circuit Parameters of Single-Phase Transformer by Performing O.C. Test Objective: To perform the O.C. test of a single- phase transformer with the help of an ammeter, voltmeter and a wattmeter and to find out the core loss of the transformer, different parameter at no load condition and to predetermine the …

## Control the Speed of DC Shunt Motor BELOW Rated Speed & Draw the Speed Characteristics

Experiment No.: 3(B) Experiment Name: Control the Speed of DC Shunt Motor Below Rated Speed & Draw the Speed Characteristics. Objective: the speed of a DC Shunt Motor by armature control method. To draw the field current vs. speed characteristics. Theory: A resistance is necessary to connect in series of the armature to control initial …

## Control the Speed of DC Shunt Motor ABOVE Rated Speed & Draw the Speed Characteristics

Experiment No.: 3(A) Experiment Name: Control the Speed of DC Shunt Motor Above Rated Speed & Draw the Speed Characteristics. Objective: To control the speed of a DC Shunt Motor by field control method. To draw the field current vs. speed characteristics. Theory: The flux of a DC motor can be changed by changing the …

## Starting and Reversing of DC Motor

Experiment No.: 2 Experiment Name: Starting and Reversing of DC Motor. Objective: To start a DC Shunt Motor. To run the motor in forward and reverse direction. Theory: DC Motor Rotation: A simple DC electric motor. When the coil is powered, a magnetic field is generated around the armature. The left side of the armature …

## Plot the O.C.C. of a D. C. Generator & find the Critical Resistance

Experiment No.: 1 Experiment Name: Plot the O.C.C. of a D. C. Generator & find the Critical Resistance. Objective: To plot open circuit characteristics of a DC shunt generator To find critical resistance from the characteristics curve Theory: In a DC Generator an expression for the voltage generated (E) in the armature winding can be …

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