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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. |
Q41 ⇒ The function of insulating liquids is both (a) and (b) [other wrong options] [Discuss in forum] to provide electrical insulation to provide heat transfer none of the above |
Q42 ⇒ The resistivity of the insulator ____ in
the presence of moisture. is considerably lowered [other wrong options] [Discuss in forum] is considerably increased remains unaffected none of the above |
Q43 ⇒ ____ breakdown normally occurs when
the temperature is very high and surrounding
air has high humidity. Electrochemical [other wrong options] [Discuss in forum] Purely electrical Electrothermal |
Q44 ⇒ Which of the following is not a ferroelectric
material ? Brass [other wrong options] [Discuss in forum] Rochelle salt Barium titanate Lead zirconate |
Q45 ⇒ The materials having permanent electric
moment are called electrets [other wrong options] [Discuss in forum] antiferro-electric materials dielectrics semiconducting materials |
Q46 ⇒ ____ materials have relative permeability
slightly less than unity Diamagnetic [other wrong options] [Discuss in forum] Ferro-magnetic Paramagnetic None of the above |
Q47 ⇒ Which of the following factors cause
magnetic ageing ? All of the above [other wrong options] [Discuss in forum] Presence of strong external fields Changes in the external magnetic circuit, such as increasing the air gap length or removing the "keeper" Mechanical vibration Temperature condition |
Q48 ⇒ Which of the following materials is
preferred for transmitting electrical
energy over long distance ? Steel reinforced aluminium [other wrong options] [Discuss in forum] Copper Aluminium Steel reinforced copper |
Q49 ⇒ High resistivity materials are used in all of the above [other wrong options] [Discuss in forum] precision instruments heating elements motor starters incandescent lamps |
Q50 ⇒ At transition temperature the value of
critical field is zero [other wrong options] [Discuss in forum] negative real value positive real value complex value |
Q51 ⇒ Solder is an alloy of tin and lead [other wrong options] [Discuss in forum] copper and aluminium nickel, copper and zinc silver, copper and lead |
Q52 ⇒ ____ is a hard solder. Copper-zinc [other wrong options] [Discuss in forum] Tin-lead Tin-silver-lead None of the above |
Q53 ⇒ The conductivity of a metal is determined
by the electronic concentration and the mobility of the free electrons [other wrong options] [Discuss in forum] the number of valence electrons per
atom either (a) or (b) none of the above |
Q54 ⇒ Which of the following are non-conductors
of electricity? All of the above [other wrong options] [Discuss in forum] Non-metal solids except carbon Air and most other gases Pure water and liquids in general except mercury |
Q55 ⇒ Which of the following materials is
used for making coils of standard resistances
? Manganin [other wrong options] [Discuss in forum] Copper Nichrome Platinum |
Q56 ⇒ ____ has the best damping properties. Cast iron [other wrong options] [Discuss in forum] Diamond High speed steel Mild steel |
Q57 ⇒ In conductors conduction of electricity
takes place due to movement of electrons only [other wrong options] [Discuss in forum] positive ions only negative ions only positive and negative ions none of the above |
Q58 ⇒ Thermistors find use in which of the
following ? All of the above [other wrong options] [Discuss in forum] In thermometry In measurement of microwave power As a thermal relay In control devices actuated by temperature changes |
Q59 ⇒ Non-linear resistors are also called varistors [other wrong options] [Discuss in forum] thermistors either of the above none of the above |
Q60 ⇒ The dielectric strength of mica varies
from 40 to 150 kV/mm thickness [other wrong options] [Discuss in forum] 10 to 20 kV/mm thickness 20 to 30 kV/mm thickness 30 to 40 kV/mm thickness |
Or |