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Design of Electrical Machines Mcqs

Q:

What materials are used as conductors in the Transmission and Distribution sector?

A) copper B) silver
C) tungsten D) carbon
 
Answer & Explanation Answer: A) copper

Explanation: Conductors in power system require less resistivity, highly malleable, highly ductile and less cost. Silver has all the above properties, but it is highly costly. So that makes copper highly suitable.

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116
Q:

High resistivity material used in making the filaments of incandescent lamps.

A) true B) false
 
Answer & Explanation Answer: A) true

Explanation: It is because to protect the lamps from getting over-heated. If the filaments get over-heated, it can lead to the bursting of the lamps.

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63
Q:

Example of high resistivity material is ________________

A) copper B) gold
C) aluminum D) carbon
 
Answer & Explanation Answer: D) carbon

Explanation: Carbon is the highly resistivity material of all the materials. Whereas the other 3 materials are associated with low resistivity property in nature.

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100
Q:

Example of low resistivity material is _____________

A) silver B) manganese
C) magnesium D) tungsten
 
Answer & Explanation Answer: A) silver

Explanation: Silver is the low resistivity material of all given materials. Tungsten is a part of high resistivity materials. The other two materials do not have a fixed resistivity and they vary with temperature.

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125
Q:

What is the correct classification of the conducting materials?

A) low resistivity, low conductivity B) low resistivity, high conductivity
C) high resistivity, high conductivity D) medium resistivity, medium conductivity
 
Answer & Explanation Answer: B) low resistivity, high conductivity

Explanation: Resistivity is inversely proportional to the conductivity. So, if the material consists of high resistivity then it will obviously have low conductivity and vice versa.

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69
Q:

What is the basic property of electrical conducting materials?

A) allows the passage of current through the materials B) blocks the passage of current through the materials
C) leaks the current through the materials D) reverses the direction of current in the materials
 
Answer & Explanation Answer: A) allows the passage of current through the materials

Explanation: The basic property of conducting materials is to allow the flow of charges, and align them in a particular direction. The process is nothing but the flow of current in the materials.

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