BASIC ELECTRICAL PRACTICE

How many electrons are there in the third cell of the copper atom? 8 13 18 29

Which is the semiconductor material? Eureka Ebonite Manganin Germanium

What is the indication of neon polarity indicator used for checking A.C. supply? Both electrodes will glow Only one electrode will glow Both electrodes will be flickering One electrode will glow and another will be flickering

Calculate the electrical energy in unit consumed by 500W lamp for 5 hours. 0.5 unit 1.0 unit 1.5 unit 2.5 unit

What is the value of hot resistance of a bulb rated as 100W/250V? 31.25 ohm 62.50 ohm 312.50 ohm 625.00 ohm

Which law states that in closed electric circuit, the applied voltage is equal to the sum of the voltage drops? Ohm’s law Laws of resistance Kirchhoff’s first law Kirchhoff’s second law

Calculate the total power of the circuit of two lamps rated as 200W/240V are connected in series across 240V supply? 50 W 100 W 200 W 400 W

What is the reading of ohmmeter across opened ‘R2’ resistor?

Indicate zero reading Indicate infinite resistance Total resistance value of the circuit Value of sum of the resistance of R1 and R3 only |

What is the change of resistance value of the conductor as its diameter is doubled? Increases to two times Decreases to four times Decrease to half of the value No change in value of resistance

What is the name of the resistor?

Metal film resistor Wire wound resistor Carbon film resistor Carbon composition resistor

Which material is having negative temperature co-efficient property? Mica Eureka Copper Manganin

What electrical quantities are related in Ohm’s law? Current, resistance and power Current, voltage and resistivity Current, voltage and resistance Voltage, resistance and current density

What is the effect of the parallel circuit with one branch opened? Current will remain same Whole circuit will not function No current will flow in that branch Voltage drop increase in the opened branch

What is the unit of resistivity? ohm / cm ohm / cm2 ohm - meter ohm / meter

Which type of resistor is used for Arc quenching protection in circuit breakers? Varistors Sensistors Thermistors Light dependent resistor

Which is the application of series circuit? Voltmeter connection Lighting circuits in home Shunt resistor in ammeter Multiplier resistor of a voltmeter

What is the effect on opened resistor in series circuit? No effect in opened resistor Full circuit current will flow in opened resistor Total supply voltage will appear across the opened resistor No voltage will appear across the opened resistor

What is the name of the resistor if its resistance value increase with increase in temperature? Varistors Sensistors Thermistors Light dependent resistor

What is the formula for Quantity of electricity (Q)? Current x Time Voltage x Current Current x Resistance Voltage x Resistance

What is the unit of conductance? Mho Ohm Ohm-m Ohm/m

Which one defines the change in resistance in Ohm(Ω) per degree centigrade (°C)? Temperature effect Laws of temperature Temperature constant Temperature co-efficient

Which type of meter is used to test the polarity of battery? Moving iron ammeter Moving coil voltmeter Moving iron voltmeter Dynamometer type wattmeter

Which is the application of series circuit? Fuse in circuit Voltmeter connection Electrical lamp in homes Shunt resistor in ammeter

Which method is used for measuring 1 Ohm to 100K Ohm range resistance? Substitution method Kelvin bridge method Wheat stone bridge method Voltmeter and ammeter method

What is the S.I unit of specific resistance? Ohm/cm Ohm/metre2 Ohm-meter Micro ohm/cm2

Which electrical quantity affects the heat generated in a conductor? Voltage Square of the current Square of the resistance Current passed through it

What is the change in value of resistance of the conductor, if its cross section area is doubled? No change Decreases 2 times Increases 2 times Decreases 4 times

What is the resistance of Light Dependent Resistor (LDR), if the intensity of light is increased? Increases Decreases Remains same Becomes infinity

Which formula is used to calculate the power of a DC circuit? Voltage x time Current x voltage Current x resistance Voltage x resistance

What is the value of resistance in an open circuit? Zero Low High Infinity

What is the specific resistance value of copper conductor? 1.72 Ohm/cm3 1.72 Micro ohm 1.72 Micro ohm/cm3 1.72 Micro ohm/m

Which is inversely proportional to the resistance of a conductor? Length Resistivity Temperature Area of cross section