• General concept of rotating electrical machines. Principle of DC generator. Use of Armature, Field Coil, Polarity, Yoke, Cooling Fan, Commutator, slip ring and Brushes, Laminated core etc. E.M.F. equation Separately excited and self excited generators. Series, shunt and compound generators.
• Armature reaction, Commutation, inter poles and connection of inter poles. Parallel Operation of DC Generators. Load characteristics of DC generators. Application, losses & efficiency of DC Generators. Routine & maintenance.
• Principle and types of DC motor.

•  Use of various types of cells. 
•  Practice on grouping of cells for specified voltage and current under different conditions and care.  
•  Prepare and practice on battery charging and details of charging circuit. 
•  Practice on routine, care/ maintenance and testing of batteries. 
•  Determine the number of solar cells in series / parallel for given power requirement.

• Determine the value of resistance by colour code and identify types.
• Test active and passive electronic components and its applications. 
• Determine V-I characteristics of semiconductor diode. 
• Construct half wave, full wave and bridge rectifiers using semiconductor diode. 
• Check transistors for their functioning by identifying its type and terminals. 
• Bias the transistor and determine its characteristics. 
• Use transistor as an electronic switch and series voltage regulator. 
• Operate and set the requir

TIME: 8 HRS.
MARKS: 270
Note: Attempt all the questions. All questions carry equal marks.

1. Study, test and repair a domestic mixer grinder for electrical faults.

2. (i) Bind a pin insulator from the top groove.
   (ii) Bind a shackle insulator from its neck for intermediate pole conductor.

3. (i) Test the insulation resistance of the given electric cable using megger.
   (ii) Test the electrical house wiring for open circuit, short circuit and leakage with the help of a magger.

• Identify terminals, parts and connections of different types of DC machines.
• Measure field and armature resistance of DC machines.
• Determine build up voltage of DC shunt generator with varying field excitation and performance analysis on load.
• Test for continuity and insulation resistance of DC machine.
• Start, run and reverse direction of rotation of DC series, shunt and compound motors.
• Perform no load and load test and determine characteristics of series and shunt generators.

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ELECTRICIAN
(PRACTICAL)
SEMESTER-II
TIME: 8 HRS.
MARKS: 270
Note: Attempt all questions.

1. Make a circuit of a full wave center tap rectifier on a breadboard and see the
waveforms on C.R.O at various points and write down their values.

2.To determine the efficiency of D.C. shunt motor and its performance characteristics.

3.Take two exhaust fans and do wiring in such a way that only one fan is ON at any
given time or both are OFF using appropriate switches.

ELECTRICIAN
(PRACTICAL)
SEMESTER -II
(SESSION 2017-2018) - NSQF LEVEL-5
TIME: 8 HRS.
MARKS: 270
Note: Attempt Any three questions. All questions carry equal marks.

1.  Assemble house wiring including carthing for 1-phase energy, mater MCB. ceilina fan, tobe ighi, three pin sockel and a lamp operated from two different positions.    Demonstrate the basics fonctional study of components used in house wiring.

2. Prepare pipe / plate earthing and measure earth resistance by earth tester/ megger.

🧵 Materials Used for Winding and Winding Wires in Small Transformers

In small transformers, the choice of winding materials is critical to ensure efficiency, reliability, and thermal stability. Different materials are selected based on their electrical conductivity, mechanical strength, and thermal endurance. 🌟

🧪 Testing of Transformer Oil

Transformer oil, also known as insulating oil, plays a crucial role in cooling and insulating transformers. Over time, the quality of transformer oil can degrade due to contamination, oxidation, or moisture absorption. Hence, regular testing is essential to ensure proper functioning and longevity of transformers. 🛡️