Electrical Engineering- Electric Current and Ohm's Law
Electrical Engineering- Electric Current and Ohm's Law
61.
40 W bulb A will be least bright when
- only keys k1 and k2 are open
- only keys k2 is open
- only keys k3 is open
- all keys are closed.
62.
The power consumption of the circuit will be maximum when
- key k1 and k3 are closed and k2 is open
- key k1 is closed, k2 and k3 are open
- key k1 and k2 are closed and k3 is open
- all the keys are closed.
63. Which of the following lamps will have least resistance at room temperature ?
- 200 W, 220 V
- 100 W, 220 V
- 60 W, 220 V
- 25 W, 220 V.
65.
Which resistor will be physically larger in size ?
- 10 ohm, 50 W
- 100 ohm, 10 W
- 1 kohm, 1 W
- 10 Mohm, 1/ 2 W.
66. Four resistances R1 , R2, R3 and R4 are connected in series against 220 V supply. The resistances are such that R1 > R2 > R3 > R4. The least power consumption will be in
- resistor R1
- resistor R2
- resistor R3
- resistor R4.
67.
100 resistors of 100 ohms each arc connected in parallel. Their equivalent resistances will be
- 10,000 ohms
- 100 ohms
- 1 ohm
- 1/ 10000 ohm.
68.
For a fixed supply voltage the current flowing through a conductor will decrease when
- cross-sectional area of the conductor is increased
- length of the conductor is increased
- length of the conductor is reduced
- cross-sectional area is increased and length is decreased.
69.
Two 1 kilo ohm, 1/2 W resistors are connected in series. Their combined resistance value and wattage will be
- 2 kohm, 1 / 2 W
- 2 kohm, 1 W
- 2kohm, 2 W
- 1 kohm, 1 / 2 W