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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. |
Q61 ⇒ Which of the following tests is carried
out on transformer oil ? All of the above [other wrong options] [Discuss in forum] Moisture test Acidity test Sludge resistance test Electric strength test |
Q62 ⇒ The value of dielectric strength is useful
in which of the following ? All of the above [other wrong options] [Discuss in forum] Comparing insulating materials Measuring uniformity Determining the effect of environmental and operating conditions |
Q63 ⇒ The power arc following a flashover or
the breaking of contacts over the insulator
surface subjects the surface to
which of the following ? All of the above [other wrong options] [Discuss in forum] Extreme heat Chemical action Deposition of electrode material |
Q64 ⇒ Which of the following is a ferro-electric
material ? Boron nitride [other wrong options] [Discuss in forum] Stainless steel Wrought iron Y-alloy |
Q65 ⇒ Capacitors with very high dielectric
constants have been developed by treating
BaTiO3 in a reducing atmosphere [other wrong options] [Discuss in forum] an oxidising atmosphere either of the above none of the above |
Q66 ⇒ The permeability of iron is around 2000 [other wrong options] [Discuss in forum] 500 800 1200 |
Q67 ⇒ The relative magnetisat ion under a given
field ____ as temperature approaches
the Curie point. decreases [other wrong options] [Discuss in forum] increases either of the above none of the above |
Q68 ⇒ ____ is a negatively charged particle
present in an atom. Electron [other wrong options] [Discuss in forum] Proton Neutron None of the above |
Q69 ⇒ The kinetic energy of a bounded
electron is less than that of unbounded electron [other wrong options] [Discuss in forum] greater than that of unbounded
electron equal to that of unbounded electron infinite none of the above |
Q70 ⇒ Mercury as an electric contact material is a metal liquid [other wrong options] [Discuss in forum] a liquid a metal a gas |
Q71 ⇒ Which of the following variety of copper
has the best ccn.ductivity ? Pure annealed. copper [other wrong options] [Discuss in forum] Induction hardened copper Hard drawn copper Copper containing traces of silicon |
Q72 ⇒ ____ is most commonly used for making magnetic recording tape Ferric oxide [other wrong options] [Discuss in forum] Silver nitrate Small particles of iron Silicon-iron |
Q73 ⇒ Addition of 0.3 to 4.5% silicon to iron
____ the electrical resistivity of iron. increases [other wrong options] [Discuss in forum] decreases does not change |
Q74 ⇒ The resistivity of a metal is a function
of temperature because the amplitude of vibration of the atoms varies with temperature [other wrong options] [Discuss in forum] the electron density varies with
temperature the electron gas density varies with temperature |
Q75 ⇒ Carbon bearings are used under which
of the following conditions ? All of the above [other wrong options] [Discuss in forum] Where lubrication is difficult or impossible Where corrosive chemical action exists Where high temperature exists |
Q76 ⇒ Substances whose specific resistance
abruptly decreases at very low temperature
are called superconductors [other wrong options] [Discuss in forum] insulators conductors semiconductors |
Q77 ⇒ The photo-electric effect occurs only
when the incident light has more than
a certain critical frequency [other wrong options] [Discuss in forum] intensity speed wave length |
Q78 ⇒ The carbon percentage is least in wrought iron [other wrong options] [Discuss in forum] low carbon steel cast iron malleable iron |
Q79 ⇒ In a semiconductor the resistivity
decreases ____ with temperature, exponentially [other wrong options] [Discuss in forum] linearly non-linearly |
Q80 ⇒ Thermistors possess a negative temperature resistivity of high absolute value [other wrong options] [Discuss in forum] zero resistivity a positive temperature resistivity of high absolute value none of the above |
Or |