Wireman – Semester 2 Module 6 – Commercial wiring
159 : What is the minimum bus bar clearance between phases in medium voltage application?
A : 25 mm
B : 32 mm
C : 36 mm
D : 40 mm
160 : What is the maximum permissible voltage drop at the point of the commencemert of supply at the consumers end for high and extra high voltage as per IE rule?
A : 12.5%
B : 8%
C : 5%
D : 3%
161 : How the cable is to be connected with the distribution boards as per IE rule?
A : By crimping lugs without cutting any cable strands
B : By crimping lugs with some strands cut off
C : By directly inserting the strands into terminals
D : By twisting the strands and inserting into terminals
162 : Which is used to protect the conductors that passing through walls in commercial wiring as per IE rules?
A : Wood batten
B : Rigid metal conduit
C : Flexible metal conduit
D : Flexible non metal conduit
163 : What is the full form ofLAN?
A : Load Area Network
B : Local Area Network
C : Local Aviation Network
D : Local Active Network
164 : Which is the inter processor distance of LAN?
A : Above 1000 km
B : 10 km to 1000 km
C : 1 km to 10 km
D : 0 to 1 km
165 : Which is the data transmission medium in LAN?
A : PVC cable
B : Armoured cable
C : Belted cable
D : Coaxial cable
166 : What is the characteristics ofLAN?
A : Consist one computer only
B : Group of 2 or more computers in the same building
C : Group of computers in different building
D : Group of computers in different area
167 : What is electrical drive?
A : Electro mechanical device
B : Electrical device
C : Electronic device
D : Mechanical device
168 : Which is the application of electrical drives?
A : Agricultural pumps
B : Fabricating workshop
C : Water treatment plant
D : Electric traction
169 : Which is the advantage of AC drive?
A : Power and control circuit are simple
B : Speed and design ratios have upper limits
C : Produce a simulated wave form
D : Heavy windings required
170 : Which colour LED indicates the fault occurred in drives?
A : Green
B : Yellow
C : Red
D : Blue
171 : What is the expansion of UPS?
A : Uninterrupted Power System
B : Uninterrupted Power Supply
C : Uninterrupted Power Solution
D : Uninterrupted Power Section
172 : Which circuit diagram is illustrated?
A : ON line UPS
B : OFF line UPS
C : Bridge rectifier
D : Metal rectifier
173 : Which part is marked as in the block diagram ofOFF line UPS?
A : Reset switch
B : Change over switch
C : Control panel
D : Battery charger
174 : What is the relation between back up time and capacity of the battery of an UPS?
A : Capacity of battery increases back up time increases
B : Capacity of battery increases back up time decreases
C : Capacity of battery decreases back up time increases
D : Capacity of battery has no relations with back up time
175 : Which component is connected across the transformer winding of an UPS for protection from lightning?
A : Diode
B : Transistor
C : Triode
D : Polyster capacitor
176 : Which electrical / electronic device requires ups?
A : Air conditioner
B : Micro wave oven
C : Computer
D : Television
177 : Why the battery is to be placed nearer to ups in ups wiring?
A : To minimise the length of cable
B : For safety reasons
C : To increase the life of battery
D : To reduce voltage drop
178 : What adjustment is to be done in commercial installation for interconnection of two or more UPS?
A : By connecting manually
B : By using a change over relay
C : By using rotary switch
D : By using ICDP switch
179 : How the capacity of an inverter is expressed?
A : Watt hour
B : Ampere
C : Volt ampere
D : Ampere hour
180 : Which wire is used to connect inverter and battery?
A : PVC 1.5 sqmm copper wire
B : Special auto wire
C : PVC 1.5 sqmm aluminium wire
D : PVC 2.5 sqmm copper wire
181 : How the neutral is provided in an inverter?
A : It is common for inverter output and AC mains
B : Separate neutral wire is provided
C : Neutral is provided for out put only
D : Neutral is provided for AC mains only
182 : How many colour coded wires the RJ-45 cable contains?
A : 4
B : 6
C : 8
D : 10
183 : What is the name of the part marked as x ?
A : Jacket
B : Foil
C : Dielectric
D : Braid
184 : What are the two colours used in 2 pairs of Ethernet RJ 45 cable?
A : Blue and orange
B : Blue and brown
C : Orange and green
D : Brown and orange
185 : What does the name coaxial refer?
A : Common axis of two conductors
B : Common array of all conductor
C : Common conductor axis
D : Common axial of one conductor
186 : What is the use of co – axial cable?
A : For transmitting electricity
B : For power wiring
C : For transmitting video signals
D : For house wiring
187 : Which computer networking component connect multiple ethernet segments together?
A : Router
B : Switch
C : Bridge
D : Hub
188 : What is the reason for using annealed copper conductor for telephone cable?
A : For good physical appearance
B : For high dielectric strength
C : To get more flexibility
D : To avoid corrosion
189 : What is the full form of DTH system?
A : Direction to home
B : Divert to home
C : Direct to home
D : Distance to house
190 : What is the size of speaker wire if the distance between speaker and amplifier is less than 50 feet?
A : 10 swg
B : 12 swg
C : 16 swg
D : 18 swg
191 : What is the full form of UTP copper wiring?
A : Uniform sheated Turns Package
B : Unshielded Twisted Pair
C : Unshielded Turns Pair
D : Universal stranded Twisted Package
192 : What are the three main factors to be considered for DTH wiring?
A : Safety, planning, budgeting
B : Collection of material, wiring, testing
C : Marking layout, fixing of accessories, wiring
D : Measuring, marking layout, wiring
193 : Which cable is used for DTH termination to TV?
A : RJ 45 cable
B : Lead sheathed cable
C : CTS cable
D : Weather Proof cable
194 : Why correct thickness of wire must be selected for DTH/home theater connection?
A : To minimize the voltage drop in wiring circuit
B : To obtain good speaker performance
C : To increase the electrical conductive of the wire
D : To avoid loose connections on the terminal of the components
195 : What is the reason, the cables of Home theatre must be run away from the power supplies?
A : To get more clarity video
B : To avoid interference with audio and video of musical item
C : To avoid short circuit between power conductor wiring
D : To protect the components from impact of audio
196 : Which factor is noticed as an impact on home theatre wiring?
A : Speaker performance
B : Video component performance
C : Space of the room installation
D : Interference issues of wiring
197 : What is the name of part marked as?
A : Energy meter
B : I C cut out
C : Main Switch
D : Distribution board
198 : What percentage limit of error is permitted to the energy meter used for service meter board?
A : 1%
B : 2%
C : 3%
D : 5%
199 : Which location, the IC cut out is to be connected in service meter board?
A : Between main switch and distribution board
B : Between energy meter and main switch
C : First position of the service meter band
D : Last position of the service board connection
200 : What is the minimum height of energy meter fixing as per NE code of practise and IE rules?
A : 1 metre
B : 1.5 metre
C : 1.75 metre
D : 2 metre
201 : Which tool is used to make holes for fixing meter board in walls during wiring?
A : Pipe jumper
B : Rawl jumper
C : Cold chisel
D : Crow bar
202 : What is the use of Rawl jumper while fixing energy meter board on wall?
A : To make pilot hole on the wooden gutties
B : To make holes on the bricks
C : To mark the hole points on the wall
D : To make grooves on the concrete
203 : Where the wooden gutties are used in wiring?
A : Wooden board
B : Metal board
C : Rigid walls
D : Non-rigid walls
204 : Which is to be considered to select the size of ECC for earthing to service meter?
A : Supply voltage from supplier side
B : Type of wiring installation done in the system
C : Current carrying capacity of installation
D : Type of wiring material used
205 : Which material is used to prepare heating element?
A : Copper
B : Aluminium
C : Nichrome
D : Silver
206 : What is the formula to calculate the thermal efficiency?
207 : What is the formula for heat generated?
208 : Which material, the heater plate is made of?
A : Porcelain
B : Ceramic
C : Ebonite
D : Bakelite
209 : Where the heating element is placed in an immersion type heater?
A : Near the outer seating
B : Inside a hollow tube
C : Out side the body
D : Below the body
210 : Why the grooves are designed with projection in heater plate?
A : For the uniform distribution of heat
B : To prevent the heating element from coming out of grooves
C : To reduce the space for coiled heating element
D : To increase the resistance of the heating element
211 : Which metal is used to make contact points of thermostat?
A : Copper
B : Silver
C : Aluminium
D : Brass
212 : What is the property of heating element used in electrical heating appliances?
A : Low co efficient of expansion
B : Low specific resistance
C : Low mechanical strength
D : Low voltage withstanding
213 : What is the name of diagram?
A : Wiring diagram
B : Installation diagram
C : Layout diagram
D : Circuit diagram
214 : Which is the permissible voltage drop in declared voltage supply to HT consumer as per IE rule?
A : Not more than 5%
B : Not more than 8%
C : Not more than 10%
D : Not more than 12%
215 : Which formula is used to calculate the permissible voltage drop in 3 phase wiring circuits (I=line current R= Resistance of one core only)
A :
B : 3 IR
C : IR
D : 2IR
216 : Which wiring system is suitable for high rise buildings?
A : Looping out from switches
B : Distribution system
C : Ring main system
D : Tree system
217 : Which type of distribution is suitable for commercial wiring of multistoried flats?
A : Looping out with junction
B : Looping out with switch
C : Bus chamber
D : Raising mains
218 : Which system of wiring enables the appliances connected to the system to have same voltage?
A : Ring main system
B : Raising main system
C : Distribution board system
D : Tree system
219 : How many earths are to be provided along with the vertical run of raising mains in commercial building wiring?
A : 1
B : 2
C : 3
D : 4
220 : Which load is to be given separate lines as essential in commercial wiring?
A : Stair case and garden
B : Verandah and portico
C : Common walking area
D : Lift and water supply
221 : How many wall socket are located in hall of the building layout?
A : 2
B : 3
C : 4
D : 5
222 : What is the name of the symbol marked as x in the layout diagram?
A : Single tube fluorescent lamp fitting
B : Twin tube fluorescent lamp fitting
C : Incandescent lamp
D : Fan regulator
223 : What does the marking, marked as x represent in the office layout?
A : Size of each wire in mm2
B : Number of wire runs
C : Number of pipes runs
D : Number of wires inside the pipe
224 : Which is the purpose of layout diagram used for building installation?
A : To locate the position of electrical points in each used in the building
B : To calculate the total connected load
C : To estimate the labour cost for wiring
D : To estimate the material cost for wiring installation
225 : How many branch circuits are used in the layout diagram?
A : 1
B : 2
C : 3
D : 4
226 : How much starting current of motor with respect to load current for calculation of cable size?
A : One time of full load current
B : One and half time of full load current
C : Two times of full load current
D : Three times of full load current