1. MOV protection in a UPS system is used for which of the following? 1. Protection against overload current 2. Protection against high input voltage 3. Protection against frequency variations 4. Protection against temperature variations   ANS- 2 2.Which of the following best defines the effect of corona on a power line? 1. The diameter of the conductor remains the same, whereas the electrostatic stress is decreased. 2. The virtual diameter of the conductor is decreased and the electrostatic stress is increased. 3. The diameter of the conductor is increased but the electrostatic stress remains the same. 4. The virtual diameter of the conductor is increased and the electrostatic stress is decreased. ANS-4 3.Which of the following statements are correct for planned preventive maintenance? (i)Overtime costs are reduced (ii)Improves the safety and health of workers (iii)Reduced number of repairs (iv)Improper usage of manpower 1. Only ii, iii and iv 2. Only i, ii and iv 3. Only i, ii ...

  1. Which of the following materials will witness a decrease in resistance when its temperature d ecreases? 1. Mica 2. Aluminum 3. Paper 4. Rubber Ans - 2 2. The operating temperature of a gas-filled tungsten filament lamp is about ______. 1. 2700⁰ C 2. 2000⁰ C 3. 1500⁰ C 4. 2200⁰ C Ans - 1 3. The application of stepper motor is______. 1. Hair dryer 2. Mixture & grinder 3. Exhaust fan motor 4. Printers & fax machine Ans - 4 4. Which of the following is NOT an effect of single phasing in a three-phase induction motor ? 1. Motor will continue run from running position 2. Motor current is increasing 2.5 times to average current 3. Motor cannot be increasing the heating 4. Motor cannot be started from stop position Ans - 1 5. When metal body of equipment is earthed, it protects the equipment from? 1. Over current 2. Leakage current 3.  Under current 4. Breakdown voltage Ans - 2 6. As a thumb rule for 415 V, 3-phase squirrel cage induction motors , full load current can...