MCQOPTIONS
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MCQOPTIONS
This section includes 110 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
Which of the following affect greatly the resistivity of electrical conductors? |
| A. | Composition |
| B. | Pressure |
| C. | Size |
| D. | Temperature |
| Answer» B. Pressure | |
| 102. |
Which of the following materials is the best conductor of electricity ? |
| A. | Tungsten |
| B. | Aluminium |
| C. | Copper |
| D. | Carbon |
| Answer» D. Carbon | |
| 103. |
By increasing impurity content in the metal alloy the residual resistivity always |
| A. | Decreases |
| B. | Increases |
| C. | Remains constant |
| D. | Becomes temperature independent |
| Answer» C. Remains constant | |
| 104. |
Due to which of the following factors the brush wear rate is altered? |
| A. | Speed of the machine |
| B. | Contact pressure |
| C. | Surface conditions of brush and commutator |
| D. | All of the above |
| Answer» E. | |
| 105. |
Which of the following materials is preferred for transmitting electrical energy over long distance ? |
| A. | Copper |
| B. | Aluminium |
| C. | Steel reinforced copper |
| D. | Steel reinforced aluminium |
| Answer» E. | |
| 106. |
Which of the following factors affect resistivity of metals ? |
| A. | Age hardening |
| B. | Alloying |
| C. | Temperature |
| D. | Cold work |
| E. | All of the above |
| Answer» F. | |
| 107. |
Superconducting metal in super conducting state has relative permeability of |
| A. | Zero |
| B. | One |
| C. | Negative |
| D. | More than one |
| Answer» B. One | |
| 108. |
Is an element used in semiconductors whose atoms have three valence electrons. |
| A. | An acceptor |
| B. | A donor |
| C. | Germanium |
| D. | Silicon |
| Answer» B. A donor | |
| 109. |
A carbon resistor contains |
| A. | Carbon crystals |
| B. | Solid carbon granules |
| C. | Pulverized coal |
| D. | Finely divided carbon black. |
| Answer» E. | |
| 110. |
Effect of moisture on the insulating materials is to |
| A. | Decrease dielectric constant |
| B. | Decrease dielectric strength |
| C. | Decrease insulation resistance |
| D. | Increase dielectric loss |
| E. | All of the above |
| Answer» F. | |