1) The temperature limit for class F insulation is
a. 105°C
b. 120°C
c. 130°C
d. 155°C
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Answer
Explanation
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ANSWER: 155°C
Explanation:
No explanation is available for this question!
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2) The commonly used materials for HV insulation is
a. Paper-oil insulation
b. Polyester resin
c. Ceramic
d. PVC
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Answer
Explanation
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ANSWER: Paper-oil insulation
Explanation:
No explanation is available for this question!
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3) Resins and varnishes are commonly used in
a. Generators and motors
b. Cables
c. Transformers
d. Circuit breakers
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Answer
Explanation
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ANSWER: Generators and motors
Explanation:
No explanation is available for this question!
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4) The resin bonded paper bushings are designed to operate at a maximum radial stress of
a. 5 kV/cm
b. 10 kV/cm
c. 15 kV/cm
d. 20 kV/cm
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Answer
Explanation
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ANSWER: 20 kV/cm
Explanation:
No explanation is available for this question!
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5) In paper based laminated construction, the typical value of dielectric constant and dielectric loss factor is
a. 3.5, 0.0015
b. 2.5, 0.0020
c. 3.5, 0.0025
d. 2.5, 0.0035
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Answer
Explanation
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ANSWER: 3.5, 0.0025
Explanation:
No explanation is available for this question!
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6) The most commonly used insulating materials for low and medium voltage cables is
a. Polyethylene
b. Porcelain
c. PVC
d. Vulcanized rubber
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Answer
Explanation
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ANSWER: PVC
Explanation:
No explanation is available for this question!
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7) For insulators and bushings of power transformers, circuit breakers and instrument transformers, the suitable materials is
a. Epoxy resin
b. Polyesters resins
c. Porcelain
d. Silicon rubber
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Answer
Explanation
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ANSWER: Porcelain
Explanation:
No explanation is available for this question!
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8) SF6 Circuit breakers are manufactured up to the voltage of
a. 33 kV
b. 66kV
c. 480 kV
d. 800 kV
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Answer
Explanation
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ANSWER: 800 kV
Explanation:
No explanation is available for this question!
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9) Insulation of dry type transformers is done using prepregs. It is manufactured by using
a. Glass fibres
b. Nomex
c. Aramide papers
d. All of these
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Answer
Explanation
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ANSWER: All of these
Explanation:
No explanation is available for this question!
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10) Insulation is necessary for the protection of equipment. Insulation is not necessary between
a. Coils and earth
b. Coils of different phases
c. Turns in a coil
d. None of these
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Answer
Explanation
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ANSWER: None of these
Explanation:
No explanation is available for this question!
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