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1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q81 ⇒ Mica is usually avoided for slot linings
of high voltage machines because its space factor is low [other wrong options] [Discuss in forum] space factor is high space factor is nil none of the above |
Q82 ⇒ Presence of even a trace of water in transformer oil ____ its insulation strength
considerably. reduces [other wrong options] [Discuss in forum] increases does not affect none of the above |
Q83 ⇒ The dielectric losses occur in all solid
and liquid dielectrics due to which of
the following ? Both (a) and (b) [other wrong options] [Discuss in forum] Conduction current Hysteresis None of the above |
Q84 ⇒ The dielectric strength of gaseous dielectrics
depends on which of the following
factors ? All of the above [other wrong options] [Discuss in forum] Pressure Uniformity of applied electric field Polarity of electrodes Frequency of applied field |
Q85 ⇒ Rochelle salt has two Curie points [other wrong options] [Discuss in forum] one Curie point three Curie points none of the above |
Q86 ⇒ The readiness of a material to accept
magnetism is expressed by its permeability [other wrong options] [Discuss in forum] permittivity either of the above none of the above |
Q87 ⇒ The spontaneous magnetisation is the
most important characteristic of ____
materials. ferro-magnetic [other wrong options] [Discuss in forum] paramagnetic diamagnetic any of the above |
Q88 ⇒ The value of steinmetz co-efficient k is
approximately ____ for all modern magnetic
materials. 2 [other wrong options] [Discuss in forum] 1.2 1.4 3 |
Q89 ⇒ The formula ____ determines the number
of electrons that can be accommodated
in any level. 2n2 [other wrong options] [Discuss in forum] 4n2 2n3 4n3 |
Q90 ⇒ A highly conductive material must
have all of the above [other wrong options] [Discuss in forum] highest conductivity and lowest temperature co-efficient good mechanical strength good corrosion resistance easy solderable and drawable quality |
Q91 ⇒ An H.R.C. fuse is a ceramic body having metal and caps [other wrong options] [Discuss in forum] a wire of platinum a heavy cross-section of copper or aluminium a ceramic tube having carbon rod inside it |
Q92 ⇒ Constantan contains copper and nickel [other wrong options] [Discuss in forum] silver and tin copper and tungsten tungsten and silver |
Q93 ⇒ Overhead telephone wires are made of steel [other wrong options] [Discuss in forum] aluminium ACSR conductors copper |
Q94 ⇒ Super conductivity can be destroyed by application of magnetic field [other wrong options] [Discuss in forum] adding impurities reducing temperatures any of the above |
Q95 ⇒ In a crystal, an atom vibrates at a frequency
determined by the stiffness of the bonds it makes with neighbours [other wrong options] [Discuss in forum] the heat content of the crystal the temperature of the crystal |
Q96 ⇒ Which of the following high resistance
materials has the highest operating
temperature ? Kanthal [other wrong options] [Discuss in forum] Manganin Nichrome Eureka |
Q97 ⇒ Which of the following materials is the
best conductor of electricity ? Copper [other wrong options] [Discuss in forum] Tungsten Aluminium Carbon |
Q98 ⇒ If the resistance ofa conductor does not
vary in accordance with Ohm's law it is
known as non-linear conductor [other wrong options] [Discuss in forum] reverse conductor bad-conductor non-conductor |
Q99 ⇒ For a particular material the Hall coefficient
was found to be zero. The
material is intrinsic semiconductor [other wrong options] [Discuss in forum] insulator metal none of the above |
Q100 ⇒ A thermistor has ____ temperatute coefficient
of resistance a negative [other wrong options] [Discuss in forum] zero a positive any of the above |
Or |