Which of the listed groups of electrical insulation materials is best suited for the highest operating temperatures? A. impregnated cotton and silk B. unimpregnated paper and cotton C. pure glass and quartz D. mica and porcelain with bonding agents

Which of the listed groups of electrical insulation materials is best suited for the highest operating temperatures? A. impregnated cotton and silk B. unimpregnated paper and cotton C. pure glass and quartz D. mica and porcelain with bonding agents
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Answer: C  
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Which of the following is not a dielectric material? (A) Cotton, silk and paper (B) Asbestos, glass, porcelain and mica (C) Rubber and polymeric resins (D) All refractory materials

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Last Answer : Option C

Which of the listed classes of electrical insulation is suited for the highest operating temperature? A. Class 90 (O) B. Class 105 (A) C. Class 130 (B) D. Class 180 (H)

Description : Which of the listed classes of electrical insulation is suited for the highest operating temperature? A. Class 90 (O) B. Class 105 (A) C. Class 130 (B) D. Class 180 (H)

Last Answer : Answer: D

Which of the following statements best describes the material known as varnished cambric? A. Felted asbestos sealed with varnish. B. Cotton cloth coated with insulating varnish. C. Rubber insulation coated with a layer of tin. D. Paper impregnated with mineral oil, specially wrapped with nonmetallic tape, and coated with varnish.

Description : Which of the following statements best describes the material known as varnished cambric? A. Felted asbestos sealed with varnish. B. Cotton cloth coated with insulating varnish. C. Rubber ... Paper impregnated with mineral oil, specially wrapped with nonmetallic tape, and coated with varnish.

Last Answer : Answer: B

Which of the listed pairs of materials make the best insulators? A. copper and aluminum B. glass and mica C. dry air and a vacuum D. doped silicon and germanium

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Electrical machinery insulation will break down more rapidly due to _________________. A. low loading of motors and generators B. frequent megger testing C. high temperatures and vibration D. high operating frequencies

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Last Answer : Answer: C

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Which of the listed conditions could indicate the need for cleaning electrical insulation? A. Low ambient temperature B. Low operating temperature C. High dielectric strength D. Low megger readings

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Last Answer : Answer: D

An insulation resistance test is performed on a particular piece of electric equipment. In addition to the resistance reading, what information listed below should be entered in the electrical log? A. The maximum allowable operating temperature of the machine. B. The temperature of the machine at the time the resistance reading was taken. C. The normal temperature rise of the machine. D. The complete nameplate data from the resistance test instrument used to obtain the reading.

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A cylindrical cable of core radius 1.25cm and impregnated paper insulation of thickness 2.13cm and relative permittivity 3.5. Compute the capacitance of the cable/km (in nF

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A cable of core radius 1.25cm and impregnated paper insulation of thickness 2.13cm and relative permittivity 3.5. Compute the capacitance of the cable/km(in nF) a) 195.7 b) 179.5 c) 157.9 d) 197.5

Description : A cable of core radius 1.25cm and impregnated paper insulation of thickness 2.13cm and relative permittivity 3.5. Compute the capacitance of the cable/km(in nF) a) 195.7 b) 179.5 c) 157.9 d) 197.5

Last Answer : a) 195.7

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Last Answer : Answer: D

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When placed in a magnetic field, which of the materials listed will maintain the highest permeability? A. Glass B. Bakelite C. Soft iron D. Aluminum

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Copper is often used as an electrical conductor because it _______________. A. has high resistance at low temperatures B. has a highly polished surface C. is able to pass current with little opposition D. holds insulation together well

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Last Answer : Answer: C

Glass is made of the mixture of-------? A. Quartz and Mica B. Sand and Salt C. Sand and Silicates (Answer) D. None of these

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When working on electrical circuits containing large capacitors, in addition to deenergizing the circuit, which of the listed precautions should also be taken? A. Keep all radio equipment away. B. Measure capacitor insulation resistance. C. Ground the capacitor terminals. D. Check capacitor circuit polarity.

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Last Answer : Answer: C

Which of the conditions listed will indicate the need to clean the insulation on the windings of an electric motor? A. Higher than normal operating temperature. B. Excessive vibration at normal speed. C. Sparking at the brushes. D. High megger readings.

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Last Answer : Answer: A

The 'dielectric constant' is a numerical value indicating the effectiveness of a dielectric material in comparison to that of a standard, which is _______________. A. paper or cloth B. glass or mica C. plastic or Teflon D. dry air or a vacuum

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Last Answer : Answer: D

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The removal of paint from electrical equipment, such as generators, should be cautiously undertaken because ____________. A. the mechanical shock of paint removal lessens the dielectric strength of the insulation B. the paint dust is composed of abrasive and semi-conducting materials which impair insulation C. paint dust buildup has a tendency to cause corrosion D. phase windings frequently become isolated from each other due to dust interference at the terminals

Description : The removal of paint from electrical equipment, such as generators, should be cautiously undertaken because ____________. A. the mechanical shock of paint removal lessens the dielectric strength ... phase windings frequently become isolated from each other due to dust interference at the terminals

Last Answer : Answer: B

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Last Answer : Answer: D

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Description : The life expectancy of electrical insulation, is approximately halved for an increased operating temperature of _______________. A. 10°C B. 25°C C. 50°C D. 100°C

Last Answer : Answer: A

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Description : Which of the listed pairs of materials make the best insulators? A. dry air and a vacuum B. tin and lead C. doped silicon and germanium D. paper and oil

Last Answer : Answer: D

Which of the listed conditions might contribute to very rapid wearing of a DC machine's commutator bars? A. A grounded commutator bar B. Using improper carbon brushes C. Aligning the front and rear mica V-rings improperly D. An open circuit in the armature

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Last Answer : Answer: B

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Which of the listed types of lighting circuits does the diagram shown in the illustration represent? EL-0081 A. High pressure sodium B. Low voltage quartz C. Mercury vapor D. Standard fluorescent

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Which one of the following is used for preparing porcelain? (A) Clay (B) Feldspar (C) Quartz (D) All of these

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The insulation of electric generators during short idle periods should be _____________. A. allowed to cool slowly to ambient temperatures B. flashed with direct current to remove any residual magnetism C. kept warm by using strip or space heaters D. relieved of all capacitive charge by grounding the conductors

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What does the minerals talcmuscovite mica quartz and olivine?

Description : What does the minerals talcmuscovite mica quartz and olivine?

Last Answer : Feel Free to Answer

What is mineral crystals of quartz biotite mica and amphibole are produced primarily by?

Description : What is mineral crystals of quartz biotite mica and amphibole are produced primarily by?

Last Answer : Cooling and soildification of magma.

Feldspar, Quartz and Mica are

Description : Feldspar, Quartz and Mica are

Last Answer : Ans. Primary minerals

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Description : Which of the following substance is highly plastic? (1) Quartz (2) Mica (3) Granite (4) Clay

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Last Answer : Answer: Option D

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The predominant constituent which is responsible for strength in granite is (A) Quartz (B) Felspar (C) Mica (D) None of the above

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Of the following types of material, which is the one that is heterogeneous? Is it: w) quartz x) feldspar y) granite z) mica

Description : Of the following types of material, which is the one that is heterogeneous? Is it: w) quartz x) feldspar y) granite z) mica

Last Answer : ANSWER: Y -- GRANITE

Which of the following is a metallic ore ? (1) Mica (2) Quartz (3) Feldspar (4) Galena

Description : Which of the following is a metallic ore ? (1) Mica (2) Quartz (3) Feldspar (4) Galena

Last Answer : Galena

Which of the following substance is highly plastic ? (1) Quartz (2) Mica (3) Granite (4) Clay

Description : Which of the following substance is highly plastic ? (1) Quartz (2) Mica (3) Granite (4) Clay

Last Answer : Clay

Empire tape is (a) varnished cambric (b) vulcanized rubber (c) impregnated paper (d) none of the above

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Which of the instruments listed is used to check insulation resistance? A. Magneto B. Megohmmeter C. Dynamometer D. Rheostat

Description : Which of the instruments listed is used to check insulation resistance? A. Magneto B. Megohmmeter C. Dynamometer D. Rheostat

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