1. Which of the following is an open loop control system ? (a) Metadyne (b) Ward leonard control (c) Stroboscope (d) Field controlled D.C. motor Ans: (d) Field controlled D.C. motor 2. Which of the following statements is correct for a system with gain margin close to unity or a phase margin close to zero ? (a) The system is relatively stable (b) The system is highly oscillatory (c) The system is highly stable (d) None of the above Ans: (b) The system is highly oscillatory 3. A current density of _____ is ilsed for large power transformers with forced circulation of oil or with water cooling coils (a) 1.5 to 2.5 A/mm2 (b) 5.4 to 6.2 A/mm2
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