Wireman 2nd year mcq

Wireman – Semester 4 Module 4 – Substation and equipment

123 : What is the name of device used for protection against lightning in over head line?
A : Air circuit breaker
B : Oil circuit breaker
C : Lightning arrester
D : Isolator

124 : Which is the function of a lightning arrester?
A : Protection from over current
B : Protection from leakage current
C : Protection from lower current
D : Protection from over voltage due to lightning

125 : Which gas is used as insulator in circuit breaker?
A : Nitrogen
B : Oxygen
C : Hydrogen
D : SF6

126 : Which circuit breaker has the lowest voltage range?
A : Air-break circuit breaker
B : Oil circuit breaker
C : Vacuum circuit breaker
D : SF6 circuit breaker

127 : Which is the purpose of circuit breaker?
A : To monitor over voltage
B : Protection and control
C : Protection and monitor heat
D : Monitor under voltage

128 : Which is a part of oil circuit breaker?
A : Insulating vessel
B : Arc shield
C : Arc splitters
D : Moving Contact

129 : What is the main purpose of oil in oil circuit breaker?
A : Provide insulation
B : Quenching arc
C : Providing cooling for contacts
D : Act as lubrication

130 : What is the full name of SF6 circuit breaker?
A : Soda flouride circuit breaker
B : Sulphur hexaflouride circuit breaker
C : Sodium flouride circuit breaker
D : Sodium bicarbonate circuit breaker

131 : What is the medium of arc quenching in an oil circuit breaker ?
A : Oil
B : Water
C : Nitrogen
D : Air

132 : Why aluminium is used as busbar material?
A : Low density
B : Low cost
C : Easy to fabrication
D : Low resistance

133 : Which metal is used as contacts in substation switches?
A : Brass
B : Copper
C : Silver
D : Tungsten

134 : What is indoor sub-station?
A : Sub-station constructed outside the building
B : Sub-station constructed inside the building
C : Pole mounted sub-station
D : The substation laid under ground

135 : Which material is used for making bus bars in indoor substation?
A : Silver
B : Steel
C : Copper
D : Gold

136 : What is the purpose of Indoor substation?
A : To step up voltage
B : To step down the voltage
C : To increase the power of transformer
D : To regulate the voltage

137 : How many types of outdoor sub-station?
A : One
B : Two
C : Three
D : Four

138 : How the busbar is rated?
A : Voltage
B : Current and voltage
C : Watt
D : KVA

139 : Why stones are provided in sub-stations?
A : To avoid the growing of plants and for insulation
B : To support the poles
C : To support the transformers
D : To avoid slippery

140 : How many types of outdoor sub-station?
A : One
B : Two
C : Three
D : Four

141 : What is function of outdoor sub-station?
A : Change AC supply into DC supply
B : Change DC supply into AC supply
C : High voltage supply step down into low voltage supply
D : Low voltage is stepped up into high voltage

142 : Which of those circuit breaker is sufficient for extra high tension line?
A : Air blast circuit breaker
B : SF6 circuit breaker
C : Minimum oil circuit breaker
D : Bulk oil circuit breaker

143 : How many poles used in pole mounted outdoor sub-station?
A : Three
B : Six
C : Two
D : Eight

144 : Which system pole mounted substations are used?
A : Primary distribution
B : Secondary distribution
C : Primary transmission
D : Secondary transmission

145 : Which is the name of substation used to change the supply frequency?
A : Converting substation
B : Switching substation
C : Secondary substation
D : Stepup substation