Question No. 1. In a stepper motor the angular displacement (A) it cannot be used for positioning of work tables and tools in NC machines. (B) it cannot be readily interfaced with micro computer based controller. (C) the angular displacement cannot be precisely controlled. (D) can be precisely controlled. Answer: (D) can be precisely controlled. Question No. 2. A control system working under unknown random actions is called (a) computer control system (b) digital data system (c) stochastic control system (d) adaptive control system Answer: Question No. 3. An ammeter is a (a) recording instrument (b) absolute instrument (c) secondary instrument (d) integrating instrument Answer: (c) secondary instrument Question No. 4 Out of the following methods of heating the one which is independent of supply frequency is (A) electric arc heating (B) induction heating (C) electric resistance heating (D) dielectric heating Answer: (C) electric resistance heating
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