24. The power taken by a 3¢ load is given by :
(ಯ) 3V, I, cosg രൂ = | sing
(0 V3V, I sing യു 3V, I, cosd
25. The function of a commutator in a d.c. generator is to :
(A) Convert induced a.c. into d.c. (B) Convert induced d.c. into 8.0.
(C) Reduce spark at brushes (M) Reduce the power factor
26. The best suited motor for cranes and hoists :
(A) d.c. shunt motor ര) d.c. compound motor
(¢) d.c. series motor (D) cumulative-compound motor
27. During charging of lead acid 0611;
(A) Its cathode become dark chocolate brown in colour
(B) 1% ೫0೦168೮ 106೩808
(C) It gives out energy
(D) Specific gravity of H,50, is decreased
28. The ratio of Ah efficiency to Wh efficiency of lead acid cell is :
(A) Always less than 1 (B) 4४७1 ४० 1
(C) Equalto 0.5 (D) Always greater than 1
29. The capacity of a cell is measured in :
(5) Watt hour (B) Watts
(C) Ampere hour (D) Ampere
६. The sulphation in a lead acid battery cccurs due to :
(A) Trickle charging (B) Incomplete charging
(C) Heavy discharging (D) Fast discharging
31. The working cycle of a petrol engine :
ക Otto cycle (B) Rankine cycle
(C) Carnot cycle (D) Diesel cycle
32, Which engine is suitable for heavy load?
(A) Diesel engine (7) Petrol engine
(C) Duel combustion engine (D) LPG engine
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