Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as __________?
A. 4 : 25
B. 25 : 4
C. 2 : 5
D. 5 : 2
Category: Engineeeing Mcqs
Two resistances Rl and Ri are connected in series across the voltage source where Rl>Ri. The largest drop will be across __________?
A. Rl
B. Ri
C. either Rl or Ri
D. none of them
A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will __________?
A. decrease
B. increase
C. remain same
D. heater will burn out
If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes __________?
A. 0.4 ohm
B. 0.6 ohm
C. 0.8 ohm
D. 1.0 ohm
The four bulbs of 40 W each are connected in series swift a battery across them, which of the following statement is true?
A. The current through each bulb in same
B. The voltage across each bulb is not same
C. The power dissipation in each bulb is not same
D. None of the above
The resistance of a few meters of wire conductor in closed electrical circuit is __________?
A. practically zero
B. low
C. high
D. very high
In a series circuit with unequal resistances, the __________?
A. the highest resistance has the most of the current through it
B. the lowest resistance has the highest voltage drop
C. the lowest resistance has the highest current
D. the highest resistance has the highest voltage drop
A 3 Q resistor having 2 A current will dissipate the power of __________?
A. 2 watts
B. 4 watts
C. 6 watts
D. 8 watts
Three 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open __________?
A. there will be heavy current in the main line
B. rest of the two bulbs will not light
C. all three bulbs will light
D. the other two bulbs will light
The rating of a fuse wire is always expressed in __________?
A. ampere-hours
B. ampere-volts
C. kWh
D. amperes
