41- The ring main system is usually used for:
(A) rural areas
(B) urban areas
(C) both for urban and rural areas
(D) None of the above
42- The heating time constant of a totally enclosed motor is relatively:
(A) independent of type of enclosure
(B) higher
(C) lower
(D) none of the above
43- Which of the following is considered a superior quality of coal ?
(A) Lignite
(B) Bituminous
(C) Coke
(D) Peat
44- Electric potential is:
(A) a phasor quantity
(B) a vector quantity
(C) a scalar quantity
(D) none of the above
45- The overall thermal efficiency of a thermal power plant lies in the range:
(A) 65% to 80%
(B) 45% to 60%
(C) 30% to 40%
(D) 20% to 25%
46- The dielectric that would make a capacitor to have lowest capacitance is:
(A) mica
(B) plastic
(C) paper
(D) air
47- Current taken by 80 watt fluorescent lamp will be
(A) more than that of 80 watt filament lamp
(B) less than that of 80% watt filament lamp
(C) equal to that of 80 watt filament lamp
(D) none of these is necessary
48- Which one of the following materials is ferromagnetic?
(A) bismuth
(B) nickel
(C) quartz
(D) aluminium
49- The efficiency of electrostatic precipitator is as high as
(A) 80%
(B) 85%
(C) 90%
(D) 99.6%
50- The resistance of a conductor, when its temperature increases
(A) increases
(B) remains constant
(C) decreases
(D) any of the above
ANSWERS:
41-(B), 42-(B), 43-(B), 44-(C), 45-(C), 46-(D), 47-(A), 48-(B), 49-(D), 50-(A)