Wireman 1st year mcq
Wireman – Semester 2 Module 5 – Industrial Wiring Practice
124 : Which wiring is preferred for motor connection in industries?
A : CTS wiring
B : TRS wiring
C : PVC conduct wiring
D : Metal conduct wiring
125 : Which factor determines the size of wire to be used for industrial motor wiring?
A : Load current
B : Supply voltage
C : Type of motor
D : Purpose of motor
126 : How many sections of wiring are there in industrial wiring?
A : 1
B : 2
C : 3
D : 4
127 : Which is the purpose of control wiring?
A : To limit the load current
B : To increase the motor input voltage
C : To communicate the commands to control devices
D : To measure the load current
128 : Why power and control wiring is to be run in a separate conduit in industrial motor wiring?
A : For easy maintenance
B : To avoid current radiation
C : For easy identification
D : To reduce the voltage drop
129 : Which place the control ON/OFF switches is to be placed a industrial motor wiring?
A : Near the control panel
B : Near the input main
C : Near the entrance
D : Near the motor
130 : Which is the part name marked as x starter face plate arrangement?
A : over load relay
B : No volt coil
C : Sprial spring
D : Studs
131 : Which is the name of starter?
A : Auto star delta starter
B : Manual star delta starter
C : D.O.L starter
D : MINI manual starter
132 : Which is the name of relay marked as x ?
A : Under voltage relay
B : Electromagnetic relay
C : Over voltage relay
D : Time delay relay
133 : Why over load relay coil is wound with thick gauge of copper wire?
A : To carry the line voltage
B : To reduce voltage drop
C : To carry load current
D : To reduce the power loss
134 : Which is the purpose of single phasing preventor in 3 phase motor circuit?
A : To protect the motor from damage
B : To run the motor continuously at single phasing
C : To regulate the supply voltage
D : To protect the motor from over load
135 : What is the formula to calculate the value of insulation resistance while testing the wiring?
136 : What is the formula to calculate the standard value of Insulation Resistance (Ri) as per BIS?
137 : Which is the unit of insulation resistance?
A : Milli ohm
B : Ohm
C : kilo ohm
D : Mega ohm
138 : Which rated voltage megger is used to measure the insulation resistance value of 3phase 415V induction motor?
A : 250V
B : 500V
C : 1000V
D : 2500V
139 : Which instrument is used to measure the insulation resistance?
A : Shunt type ohmmeter
B : Series type ohmmeter
C : Megger
D : Multimeter
140 : What is the main reason for leakage current flowing in wring installation?
A : Insulation failure
B : Low earth resistance
C : Incorrect size of earth wire
D : High earth reactance
141 : How many earth continuity conductors should be provided from the machine to panel board and to the main earth electrode?
A : 4
B : 3
C : 2
D : 1
142 : Which size of GI conductor is used for earthing to the motor from the main electrode?
A : 14 SWG
B : 10 SWG
C : 8 SWG
D : 4 SWG
143 : What is the colour code of protective earthing conductor as per NE code?
A : Blue
B : Black
C : Green
D : Red
144 : What is the recommended resistance value of earth continuity conductor used in domestic wiring installation as per IE Rules?
A : Not more than 8 ohm
B : Not more than 3 ohm
C : Not more than 2 ohm
D : Not more than 1 ohm
145 : How many earth is to be provided for a AC 3 phase induction motor?
A : 1
B : 2
C : 3
D : 4
146 : How to reduce the earth resistance value keep as low?
A : By connecting two earth in series
B : By adding more charcole
C : By connecting to earth in parallel
D : By adding more salt
147 : What is the minimum clearance required between the wall and backside of a panel board in industrial wiring?
A : Not less than 22.88 cm
B : Not less than 18.4 cm
C : Not less than 15.8 cm
D : Not less than 10.2 cm
148 : What is the minimum distance in front of the switch board for industrial pannel board wiring?
A : 2 M
B : 1-5 M
C : 1 M
D : 0.5 M
149 : What is name of part marked as x ?
A : Cable entry hole
B : Bus – bars
C : Enclosure
D : Porcelain supports
150 : What is the thickness of steel sheet using the covers of bus bar chamber?
A : 1 mm
B : 1.5 mm
C : 2 mm
D : 2.5 mm
151 : Why the equipment are arranged in front side of the switch board in industrial wiring?
A : To avoid short circuit
B : To operate easily
C : To test the supply frequently
D : To avoid personnal contacts during maintenance
152 : What is the purpose of openings provided in bus bar chamber?
A : For cable entries
B : For air circulation
C : To release the heat
D : To extend the busbar
153 : Which material is used to make busbars?
A : Brass
B : Galvanised iron
C : Aluminium
D : Bronze
154 : What is the colour code of 3 phase 4 wire AC supply system?
A : Red, yellow, black, green
B : Red, blue, black, yellow
C : Red, black, green, blue
D : Red, yellow, blue, black
155 : What is the colour code of single phase AC supply as per NE code?
A : Red and blue
B : Red and black
C : Red and green
D : Red and yellow
156 : What is the alpha numeric notation of 3 phase apparatus connection?
A : L1, L2, L3 & N
B : U, V, W & N
C : R, Y, B & N
D : A1,B1, C1 & N
157 : Which material is used for harnessing of cable?
A : Metal bands
B : P.V.C sleeves
C : Link clips
D : P.V.C saddles
158 : How the cable size is determined for industrial wiring?
A : By considering the voltage of circuit
B : By considering the load resistance
C : By considering the current carrying capacity
D : By considering the power factor
