A resistance having rating 10 ohms, 10 W is likely to be a__________?
A resistance having rating 10 ohms, 10 W is likely to be a__________?
A. metallic resistor
B. carbon resistor
C. wire wound resistor
D. variable resistor
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Whether circuit may be AC. or D. C. one, following is most effective in reducing the magnitude of the current?
Whether circuit may be AC. or D. C. one, following is most effective in reducing the magnitude of the current?
A. Reactor
B. Capacitor
C. Inductor
D. ResistorWhich of the following statement is true________________?
Which of the following statement is true________________?
A. A galvanometer with low resistance in parallel is a voltmeter
B. A galvanometer with high resistance in parallel is a voltmeter
C. A galvanometer with low resistance in series is an ammeter
D. A galvanometer with high resistance in series is an ammeterThe condition for the validity under Ohm’s law is that_______________?
The condition for the validity under Ohm’s law is that_______________?
A. resistance must be uniform
B. current should be proportional to the size of the resistance
C. resistance must be wire wound type
D. temperature at positive end should be more than the temperature at negative endInductor does not allow the sudden change of
Inductor does not allow the sudden change of
A. current
B. voltage
C. power
D. None of the aboveVoltage developed across an inductor is expressed bY
Sudden change of current means di will change at dt → 0 (dt tends to zero), so sudden change of current means infinite voltage. Therefore it is not possible.Which of the following material has nearly zero temperature co-efficient of resistance_________?
Which of the following material has nearly zero temperature co-efficient of resistance_________?
A. Manganin
B. Porcelain
C. Carbon
D. CopperIn an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains______________?
In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains______________?
A. length of heating element should be decreased
B. length of heating element should be increased
C. length of heating element has no effect on heating if water
D. none of the above