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- Define ammeter. Explain PMMC type ammeter and voltmeter with suitable diagram.
- Write basic working principle of wattmeter. Explain electrodynamometer and induction type wattmeter with suitable diagrams.
- Describe the working principle of a DC shunt motor. A DC shunt motor has a field resistance of 50 Ω and an armature resistance of 0.1 Ω. The motor is connected to a 220 V DC supply. The motor is running at full load, and the armature current is measured to be 40 A. The motor efficiency is found to be 85%. Calculate the power developed by the motor and the power input to the motor.
- A 11kV/440V single-phase transformer has a rated power of 1500 kVA. The transformer has a copper loss of 1.5 kW and an iron loss of 2.2 kW. Calculate the voltage regulation and efficiency of the transformer when it operates at full load.
- Give four hazards name that occur in electrical workshop. Describe precautions to take in Electrical workshop.