981. Is a cable is to be designed for use on 1000 kV, which insulation would you prefer ____________?
A. Polyvinyle chloride
B. Vulcanised rubber
C. Impregnated paper
D. Compressed SFe gas
E. none of the above

982. The insulation of the cable decreases with__________?
A. the increase in length of the insulation
B. the decrease in the length of the insulation
C. either A. or (b)
D. none of the above

983. In a cable the voltage stress is maximum at____________?
A. sheath
B. insulator
E. surface of the conductor
D. core of the conductor

984. The active materials of a nickel-iron battery are___________?
A. nickel hydroxide
B. powdered iron and its oxide
C. 21% solution of KOH
D. all of the above

985. During charging the specific gravity of the electrolyte of a lead-acid battery
A. increases
B. decreases
C. remains the same
D. becomes zero

986. The mass of an ion liberated at an electrode is directly proportional to the quantity of electricity. The statement is associated with____________?
A. Newton’s law
B. Faraday’s law of electromagnetic
C. Faraday’s law of electrolysis
D. Gauss’s law

987. Which type of bearing is provided in small induction motors to support the rotor shaft ?
A. Ball bearings
B. Cast iron bearings
C. Bush bearings
D. None of the above

988. 5 H.P., 50-Hz, 3-phase, 440 V, induction motors are available for the following r.p.m. Which motor will be the costliest ?
A. 730 r.p.m.
B. 960 r.p.m.
C. 1440 r.p.m.
D. 2880 r.p.m.

989. Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor _____________?
A. By changing the number of stator poles
B. Rotor rheostat control
C. By operating two motors in cascade
D. By injecting e.m.f. in the rotor circuit

990. The auto-starters (using three auto transformers) can be used to start cage induction motor of the following type__________?
A. star connected only
B. delta connected only
C. A. and B. both
D. none of the above

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