1. In a dc machine, for the same value of f, Z and N, which one of the following statements is correct? (a) Armature emf is more with wave winding than with lap winding. (b) Armature emf is less with wave winding than with lap winding. (c) Armature emf depends on whether the machine is
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1. What should come in place of the question mark (?) in the following number series? 1 4 14 45 139 422 ? A. 1268 B. 1234 C. 1272 D. 1216 E. None of these 2. 38 per cent of first number is 52 per cent of the second number. What is the respective ratio
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1. Net irrigation requirement of a crop is given by (a) Consumptive use + field losses (b) Consumptive use + conveyance losses (c) Consumptive use + field losses + conveyance losses (d) Consumptive use – effective rainfall 2. Water logging is the state of soil where (a) the water table is brought very nearer to
1. To increase the setting time of cement the following is added (a) Calcium Hydroxide (b) Sodium (c) Red Oxide of Mercury (d) Gypsum 2. Fire resistant mortars are made by using clay (a) Free from lime (b) Containing Iron oxide (c) Containing Dissolved Air (d) Of low compaction 3. The factor mainly contributing to
1. The recommended curing period for Portland Pozzolana Cement concrete (PPC) to attain full strength for concrete exposed to dry and hot weather condition is (a) 7 days (b) 10 days (c) 14 days (d) 28 days 2. If Ø denotes the diameter of steel reinforcement, as a rough rule, full anchorage of steel stressed
1. Poison’s ratio for steel within elastic limit, ranges from (a) 0.15 to 0.20 (b) 0.25 to 0.27 (c) 0.25 to 0.33 (d) 0.30 to 0.33 2. The rivets which are heated and then driven in the field, are known as (a) Power driven shop rivets (b) Power driven field rivets (c) Hand driven rivets