78. How the speed control of universal motor used for sewing machine is done?
(A) Introducing friction mechanism
(B) Tapping the field at various point
(0 Centrifugal mechanism
(1)) Introducing a variable resistance in series with the ‏تد‎ 5۳
74. Buchholz relay is operated by :
(ക) 688 pressure (B) Eddy current
(ര Blectrostatic induction (D) Electromagnetic induction
75. The size of earth wire is determined by :
(A) the atmospheric condition
(B) the voltage of the service wires
(0 the current capacity of the service wires
(D) १७१९ ७ these
76. Earthing in consumer premises is necessary to give protection againet :
(ಗಿ) Overloading (B) Danger of electric shock
(0 Voltage fluctuation (D) High temperature of the conductors
77. A single phase protection switch is used to protect :
(ക The distribution transformer
(B) The motor in case of fuse failure
(€) € motor from the damage due to single phasing
(D)) From the maximum starting current of motor
78. The best location of the power factor improving device to be installed in the transmission line
is at:
(ಗಿ) The receiving end (8) The sending शात्‌
(0 Middle of the line (0) Any place
18 motor has series characteristics.
(ക) Capacitor start motor (ए) Shaded pole motor
(£) Repulsion motor (D) None of the above
80. How the light output is produced in electric discharge lamp?
(ಗಿ) By heating effect of current (B) DBy magnetic effect of current
(C) By ionisation in a gas or vapour (D) By cathode ray emission
81. A social Reformer of Kerala who started Atmavidhya Sangham was :
(^) Vaikunda Swamikal (B) Brahmananda Sivayogi
(C) Thyecaud AyyaVaikunda (D) Vagbhadanandan
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