Module-4 Substation and equipment (2nd)

 

108 : Which is a circuit breaker?

A : Power factor improvement device
B : Protect from under voltage
C : Controlling device
D : Protect from over voltage

109 : Which is the full form of VCB?
A : Variable circuit breaker
B : Voltage control breaker
C : Vacuum circuit breaker
D : Vacuum control breaker

110 : Which condition circuit breaker operates?
A : Low current
B : Over current
C : Under voltage
D : Over voltage

111 : Which material is used for insulating of outer body of vacuum circuit breaker?
A : Glass or ceramic
B : Iron
C : Stainless steel
D : Ebonite

112 : Which circuit breaker is used in rural area?
A : OCB
B : SF6
C : vacuum circuit breaker
D : ACB

113 : Which is circuit breaker is best suited for capacitor bank switching?
A : Vacuum circuit breaker
B : air blast circuit breaker
C : SF6
D : Oil circuit breaker

114 : Which part of the circuit breaker is helpful in breaking the circuit?
A : Trip coil
B : Operating rod
C : Supporting champer
D : Circuit breaking champer

115 : What is the full form of ACB?
A : Automatic circuit breaker
B : Acutal circuit breaker
C : Alloy circuit breaker
D : Air circuit breaker

116 : What is the medium of arc quenching in an air circuit breaker?
A : Oil
B : water
C : Nitrogen
D : Air

117 : How circuit breakers arc rated?
A : Ampere
B : Voltage
C : Megawatt
D : MVA

118 : Which type of transformer, the current transformer comes under?
A : Idel transformer
B : Step down transformer
C : Step up transformer
D : Instrument transformer

119 : What is the secondary voltage of PT?
A : 440 V
B : 11000 V
C : 660 V
D : 110 V

120 : What current the secondary of a CT is designed?
A : 2 Amp
B : 3 Amp
C : 4 Amp
D : 5 Amp

121 : What action is required before disconnecting the ammeter connected with CT?
A : Remove the earth of CT
B : short the secondary of CT
C : Opened the secondary side of CT
D : Switch OFF total supply

122 : Which is the use of lighting arrester in HT line?
A : Protect the transformers from surge
B : For short circuit protection
C : For open circuit protection
D : For leakage protection

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 sub station?
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