Wireman – Semester 1 Module 3: Basic Electrical Practice
56 : Which is conductor?
A : Wood
B : Zinc
C : Rubber
D : Mica
57 : What is the property of good conductor?
A : Must have low specific resistance
B : Must have high dielectric strength
C : Must have low tensile strength
D : Must have low melting point
58 : What is the advantage of stranded conductor compared to solid conductor?
A : More rigidity
B : Flexibility
C : High melting point
D : High mechanical strength
59 : What is the main property of an insulator?
A : Low resistance
B : Low melting point
C : High temperature co-efficient
D : High dielectric strength
60 : What is the voltage grading range of high voltage?
A : 0V – 250V
B : 650V – 33000V
C : Above 33000V
D : 250V – 650V
61 : Which voltage grading 1100 volt belongs?
A : Low Voltage (L.V)
B : Medium Voltage (M.V)
C : High Voltage (H.V)
D : Extra High Voltage (E.H.V)
62 : What is the voltage grade range of medium voltage?
A : 250V-415V
B : 250-650V
C : 1.1KV-11KV
D : Above 33000V
63 : Which law states the relation between the voltage current and resistance in a closed circuit at constant temperature?
A : Ohms law
B : Kirchoffs current law
C : Kirchoffs voltage law
D : Laws of resistance
64 : Which electrical quantity is inversely proportional to the current as per ohms law?
A : Resistance
B : Voltage
C : Power
D : Energy
65 : Which bulb will have lowest resistance?
A : 240V, 60W
B : 240V, 100W
C : 240V, 200W
D : 240V,500W
66 : Calculate the value of resistance connected to the supply voltage of 100V and current through 4 A?
A : 0.4 ohm
B : 0.04 ohm
C : 25 ohm
D : 400 ohm
67 : What is the S.I unit of specific resistance?
A : Ohm/cm
B : Ohm/metre2
C : Ohm-metre
D : Micro ohm/cm²
68 : What is the specific resistance value of copper conductor?
A : 1.72 micro ohm/cm²
B : 1.72 micro ohm
C : 1.72 ohm /cm²
D : 1.72 micro ohmmeter
69 : What is the effect in resistance of the conductor, if its diameter is doubled?
A : Increase to two times
B : Increase to four times
C : Decrease to half the value
D : Decrease to ¼ th value
70 : Which is directly proportional to the resistance?
A : Area of cross section
B : Length
C : Resistivity
D : Temperature
71 : What is the total resistance (RT) if R1, R2, R3 are connected in series?
72 : What is formula to calculate electric power (P)?
73 : What is the change in total resistance value, if additional resistor is connected in a parallel circuit?
A : Decrease
B : Remains same
C : Increase 2 times
D : Increase to 1.5 times
74 : Calculate the value of series resistor?
A : 1380Ω
B : 1390Ω
C : 1400Ω
D : 1492Ω
75 : Which law states that in each closed circuit the sum of all voltage drops are equal to zero?
A : Krichoffs current Law
B : Krichoffs voltage Law
C : Law of Resistance
D : Ohm´s law
76 : Which law is used to determine the equivalent resistance of the network and the current?
A : Ohm´s law
B : Krichoffs Law
C : Laws of Resistance
D : Lenz´s law
77 : Which is the correct equation based on Kirchhoff´s first law?
A : I1 + I3 = I2 + I4 + I5
B : I1 + I2 + I3 = I4 + I5
C : I1 + I2 = I3 + I4 + I5
D : I1 + I2 = I3 + I4 + I5 = 0
78 : Which is the simplest method used to measure low resistance?
A : Voltmeter ammeter method
B : Slide wire, bridge method
C : Post office base method
D : Kelvin bridge method
79 : What is the value of voltmeter resistance (Rv) compared to resistance (Rm) to be measured?
A : Equal
B : Low
C : Very low
D : Very large
80 : Which defines that the changes in resistance in ohm per 1°C rise in temperature?
A : Thermal expansion
B : Thermal conductivity
C : Temperature coefficient
D : Thermo dynamics
81 : Which material have negative temperature coefficient?
A : Carbon
B : Tungsten
C : Nichrome
D : Mangnin
82 : Which resistor has negative temperature co-efficient?
A : Sensistor
B : Thermistor
C : Varistor
D : LDR resistor
Wireman – Semester 1 Module 4: Basic Wiring Practice
83 : Which switch is having four terminals?
A : Single pole one way switch
B : single pole two way switches
C : Intermediate switch
D : Pull switch
84 : Which type of holder is used between 200W to 300W lamp?
A : Edison screw holder
B : Goliath screw holder
C : Bracket holder
D : Angle holder
85 : Which switch is having a spring-loaded button?
A : Intermediate switch
B : Push button switch
C : Pull switch
D : Double pole switch
86 : What is the name of BIS symbol?
A : Lamp
B : Two way switch
C : Intermediate switch
D : Multi – position switch
87 : What does the symbol marked asY indicates?
A : Number of switches to be connected
B : Number of wires run on the limb
C : Number clamps (or) clips to be fixed
D : Number of the battern (or) pipe to be fixed
88 : Which supply voltage the fire alarm circuit works?
A : 240V AC
B : 220V DC
C : 110V DC
D : 24V DC
89 : Which is used to sense the heat in fire alarm circuit?
A : Varistors
B : Light dependent resistor
C : Sensistors
D : Thermistors
90 : What is the voltage range of DC series MCB?
A : 110 volt DC
B : 200 volt DC
C : 220 volt DC
D : 230 volt DC
91 : Which MCBs are designated to protect circuit with inductive loads?
A : L series MCBs
B : G series MCBs
C : DC series MCBs
D : L series and DC series MCBs
92 : Which classification of accessories, ceiling rose belongs?
A : Outlet accessories
B : Safety accessories
C : Holding accessories
D : General accessories
93 : Which type of accessories, the fuse comes under?
A : Controlling accessories
B : Holding accessories
C : Safety accessories
D : Outlet accessories
94 : Which is the purpose of iron clad fuse cut outs used in domestic service connection?
A : To protect the line from over voltage
B : To ensure the line is not loaded beyond rated current
C : To protect the service line from short circuit
D : To protect the inmates from shock
95 : What is the height the switch shall be forced above the floor level as per NEC?
A : 1.3 m
B : 1.5 m
C : 2.0 m
D : 2.5 m
96 : Which is the vertical clearance of low and medium voltage lines from buildings as per IE rules?
A : 1.2 m
B : 2.5 m
C : 5.8 m
D : 6.1 m
97 : Which is the value of insulation resistance permissible as per IE rules?
A : Not more than 1 M ohm
B : Not more than 2 M ohm
C : Not more than 3 M ohm
D : Not more than 4 M ohm