MCQOPTIONS
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MCQOPTIONS
This section includes 234 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. |
High resistivity materials are used in |
| A. | precision instruments |
| B. | heating elements |
| C. | motor starters |
| D. | all of the above |
| Answer» E. | |
| 102. |
The material for armouring on cable is usually |
| A. | steel tape |
| B. | galvanised steel wire |
| C. | any of the above |
| D. | none of the above |
| Answer» D. none of the above | |
| 103. |
Pressure cables are generally not used beyond |
| A. | 11 kV |
| B. | 33 kV |
| C. | 66 kV |
| D. | 132 kV |
| Answer» D. 132 kV | |
| 104. |
Superconductors are becoming popular for use in |
| A. | generating very strong magnetic field |
| B. | manufacture of bubble memories |
| C. | generating electrostatic field |
| D. | generating regions free from magnetic field |
| Answer» B. manufacture of bubble memories | |
| 105. |
In a superconductor the value of critical density depends upon |
| A. | magnetic field strength |
| B. | temperature |
| C. | either (a) or (b) |
| D. | both (a) and (b) |
| Answer» E. | |
| 106. |
In capacitance grading of cables we use a ______ dielectric. |
| A. | composite |
| B. | porous |
| C. | homogeneous |
| D. | hygroscopic |
| Answer» B. porous | |
| 107. |
The value of critical field below the transition temperature will |
| A. | increase |
| B. | decrease |
| C. | remain unchanged |
| D. | any of the above |
| Answer» B. decrease | |
| 108. |
PVC stands for |
| A. | polyvinyl chloride |
| B. | post varnish conductor |
| C. | pressed and varnished cloth |
| D. | positive voltage conductor |
| Answer» B. post varnish conductor | |
| 109. |
The superconductivity is due to |
| A. | the crystal structure having no atomic vibration at 0°K |
| B. | all electrons interact in the super-conducting state |
| C. | the electrons jump into nucleus at 0°K |
| D. | none of the above |
| Answer» B. all electrons interact in the super-conducting state | |
| 110. |
The surge resistance of cable is |
| A. | 5 ohms |
| B. | 20 ohms |
| C. | 50 ohms |
| D. | 100 ohms |
| Answer» D. 100 ohms | |
| 111. |
Superconductivity is observed for |
| A. | infrared frequencies |
| B. | d.c. and low frequency |
| C. | a.c. and high frequency |
| D. | frequencies having no effect |
| Answer» C. a.c. and high frequency | |
| 112. |
The conductivity of a conductor can be increased by |
| A. | decreasing its temperature |
| B. | increasing its temperature |
| C. | decreasing its vibration |
| D. | increasing its vibration |
| Answer» B. increasing its temperature | |
| 113. |
High tension cables are generally used up to |
| A. | 11kV |
| B. | 33kV |
| C. | 66 kV |
| D. | 132 kV |
| Answer» B. 33kV | |
| 114. |
A highly conductive material must have |
| A. | highest conductivity |
| B. | all of the above |
| C. | easy solderable and drawable quality |
| D. | good corrosion resistance |
| Answer» C. easy solderable and drawable quality | |
| 115. |
The kinetic energy of a bounded electron is |
| A. | less than that of unbounded electron |
| B. | greater than that of unbounded electron |
| C. | equal to that of unbounded electron |
| D. | infinite |
| Answer» B. greater than that of unbounded electron | |
| 116. |
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. | |
| 117. |
In a cable, the maximum stress under operating conditions is at |
| A. | insulation layer |
| B. | sheath |
| C. | armour |
| D. | conductor surface |
| Answer» E. | |
| 118. |
Commonly used conducting materials are |
| A. | copper |
| B. | aluminium |
| C. | both (a) and (b) |
| D. | copper and silver |
| Answer» D. copper and silver | |
| 119. |
Low tension cables are generally used up to |
| A. | 200 V |
| B. | 500 V |
| C. | 700 V |
| D. | 1000 V |
| Answer» E. | |
| 120. |
The metal having the lowest temperature coefficient of resistance is |
| A. | gold |
| B. | copper |
| C. | aluminium |
| D. | kanthal |
| Answer» B. copper | |
| 121. |
Dielectric strength of rubber is around |
| A. | 5 kV/mm |
| B. | 15 kV/mm |
| C. | 30 kV/mm |
| D. | 200 kV/mm |
| Answer» D. 200 kV/mm | |
| 122. |
A perfect conductor has |
| A. | zero conductivity |
| B. | unity conductivity |
| C. | infinite conductivity |
| D. | none of the above |
| Answer» D. none of the above | |
| 123. |
In single core cables armouring is not done to |
| A. | avoid excessive sheath losses |
| B. | make it flexible |
| C. | either of the above |
| D. | none of the above |
| Answer» B. make it flexible | |
| 124. |
The covalent bond is formed by |
| A. | transfer of electrons between atoms |
| B. | sharing of electrons between atoms |
| C. | sharing of variable number of electrons by a variable number of atoms |
| D. | none of the above |
| Answer» C. sharing of variable number of electrons by a variable number of atoms | |
| 125. |
The minimum dielectric stress in a cable is at |
| A. | armour |
| B. | bedding |
| C. | conductor surface |
| D. | lead sheath |
| Answer» E. | |
| 126. |
The co-ordination number of a simple cubic structure is |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |
| 127. |
The tiny block formed by the arrangement of a small group of atoms is called the |
| A. | unit cell |
| B. | space lattice |
| C. | either (a) or (b) |
| D. | none of the above |
| Answer» B. space lattice | |
| 128. |
Conduit pipes are normally used to protect _____ cables |
| A. | unsheathed cables |
| B. | armoured |
| C. | PVC sheathed cables |
| D. | all of the above |
| Answer» B. armoured | |
| 129. |
The formula ____ determines the number of electrons that can be accommodated in any level. |
| A. | 2n2 |
| B. | 4n2 |
| C. | 2n3 |
| D. | 4ns |
| Answer» B. 4n2 | |
| 130. |
cables are used for 132 kV lines. |
| A. | High tension |
| B. | Super tension |
| C. | Extra high tension |
| D. | Extra super voltage |
| Answer» E. | |
| 131. |
is a negatively charged particle present in an atom. |
| A. | Proton |
| B. | Neutron |
| C. | Electron |
| D. | None of the above |
| Answer» D. None of the above | |
| 132. |
In case of three core flexible cable the colour of the neutral is |
| A. | blue |
| B. | black |
| C. | brown |
| D. | none of the above |
| Answer» B. black | |
| 133. |
On which of the following factors does the resistivity of a material depend ? |
| A. | Resistance of the conductor |
| B. | Area of the conductor section |
| C. | Length of the conductor |
| D. | All of the above |
| Answer» E. | |
| 134. |
The converse of hardness is known as |
| A. | malleability |
| B. | toughness |
| C. | softness |
| D. | none of the above |
| Answer» D. none of the above | |
| 135. |
The current carrying capacity of cables in D.C. is more thanthat in A.C. mainly due to |
| A. | absence of harmonics |
| B. | non-existence of any stability limit |
| C. | smaller dielectric loss |
| D. | absence of ripples |
| Answer» D. absence of ripples | |
| 136. |
In a cable immediately above metallic sheath _____ is provided. |
| A. | earthing connection |
| B. | bedding |
| C. | armouring |
| D. | none of the above |
| Answer» C. armouring | |
| 137. |
The insulating material for cables should |
| A. | be acid proof |
| B. | be non-inflammable |
| C. | be non-hygroscopic |
| D. | have all above properties |
| Answer» E. | |
| 138. |
The bedding on a cable consists of |
| A. | hessian cloth |
| B. | jute |
| C. | any of the above |
| D. | none of the above |
| Answer» D. none of the above | |
| 139. |
The thickness of the layer of insulation on the conductor, in cables, depends upon |
| A. | reactive power |
| B. | power factor |
| C. | voltage |
| D. | current carrying capacity |
| Answer» D. current carrying capacity | |
| 140. |
Empire tape is |
| A. | varnished cambric |
| B. | vulcanised rubber |
| C. | impregnated paper |
| D. | none of the above |
| Answer» B. vulcanised rubber | |
| 141. |
Which of the following insulation is used in cables ? |
| A. | Varnished cambric |
| B. | Rubber |
| C. | Paper |
| D. | Any of the above |
| Answer» E. | |
| 142. |
Which of the following protects a cable against mechanical injury ? |
| A. | Bedding |
| B. | Sheath |
| C. | Armouring |
| D. | None of the above |
| Answer» D. None of the above | |
| 143. |
The insulating material for a cable should have |
| A. | low cost |
| B. | high dielectric strength |
| C. | high mechanical strength |
| D. | all of the above |
| Answer» E. | |
| 144. |
A differential relay measures the vector difference between |
| A. | two currents |
| B. | two voltages |
| C. | two or more similar electrical quantities |
| D. | none of the above |
| Answer» D. none of the above | |
| 145. |
Directional relays are based on flow of |
| A. | power |
| B. | current |
| C. | voltage wave |
| D. | all of the above |
| Answer» B. current | |
| 146. |
Burden of a protective relay is the power |
| A. | required to operate the circuit breaker |
| B. | absorbed by the circuit of relay |
| C. | developed by the relay circuit |
| D. | none of the above |
| Answer» C. developed by the relay circuit | |
| 147. |
An efficient and a well designed protective relaying should have |
| A. | good selectivity and reliability |
| B. | economy and simplicity |
| C. | high speed and selectivity |
| D. | all of the above |
| Answer» E. | |
| 148. |
Air blast circuit breaker is used for |
| A. | over currents |
| B. | short duty |
| C. | intermittant duty |
| D. | repeated duty |
| Answer» E. | |
| 149. |
Circuit breakers are essentially |
| A. | current carrying contacts called electrodes |
| B. | arc extinguishers |
| C. | circuits to break the system |
| D. | transformers to isolate the two systems |
| Answer» B. arc extinguishers | |
| 150. |
Circuit breakers usually operate under |
| A. | transient state of short-circuit current |
| B. | sub-transient state of short-circuit current |
| C. | sub-transient state of short-circuit current |
| D. | after D.C. component has ceased |
| Answer» B. sub-transient state of short-circuit current | |