Q5. Describe - A. A safety lamp approved as part of slips statutory equipment LIFEBUOY SELF –IGNITING LIGHTS; B. A self-igniting lamp suitable for attachment to a lifebuoy; C. State the attention required to maintain them in a satisfactory working condition.
Q1. A. Sketch a circuit diagram of a push button direct online contactor starter for a three phase Incorporating overload and short circuit protection.
B. Indicate, on a sketch of the typical characteristic curves of current and torque against Speed, disadvantages of a direct on line start squirrel cage induction motor.
Q9. A. Discuss different methods of speed control of a d.c. series motor by adjusting field ampere turns.
B. A 230 V, d.c. shunt motor runs at 1000 r.p.m and takes 5 amperes. The armature resistance of the motor is 0.025𝛀 and shunt field resistance is 230𝛀. Calculate the drop in speed when the motor is loaded and takes the line current of 41 amperes. Neglect armature reaction.
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