Q1. What are semiconductor devices? What are its advantages over thermionic devices? With respect to semiconductor devices describe working principle and application of the following: (16)
(a) Zener Diode
(b) Transistor
(c) Photocell
(d) Thyristor
Q2. Tank liquid level sensors are an integral part of ships. Describe with the aid of suitable sketches the working principle of: (a) Capacitive type level sensor (6) (b) Ultrasonic level sensor (5) (c) Float (5)
Q3. The direct online start of squirrel cage motor is used for most electrical driven on a.c. powered ships. Describe with sketches as necessary one method of overcoming each of the following problems: (16)
(a) High starting current
(b) Low starting torque
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