A capacitor acts as an infinite resistance for
1. DC
2. AC
3. DC as well as AC
4. neither AC nor DC
An AC source producing emf
ε = ε0 [cos(100 π s–1)t + cos(500 π s–1)t]
is connected in series with a capacitor and a resistor. The steady-state current in the circuit is found to be
i = i1 cos [(100 π s–1)t +ϕ1] i2 cos[(500 π s–1)t + φ2]
1. i1 > i2
2. i1 = i2
3. i1 < i2
4. the information is insufficient to find the relation between i1 and i2
A series AC circuit has a resistance of 4 Ω and a reactance of 3. Ω. The impedance of the circuit is
1. 5 Ω
2. 7 Ω
3. 12/7 Ω
4. 7/12 Ω
(a) | of the inductor increases. |
(b) | of the resistor increases. |
(c) | of the capacitor increases. |
(d) | of the circuit increases. |
1. | (a) only | 2. | (b), (c) |
3. | (c), (d) | 4. | (a), (d) |
The reactance of a circuit connected to an AC circuit is zero. It is possible that the circuit contains
(a) an inductor and a capacitor
(b) an inductor but no capacitor
(c) a capacitor but no inductor
(d) neither an inductor nor a capacitor
Choose the correct option
1. (a) only
2. (b), (c)
3. (c), (d)
4. (a), (d)
In an AC series circuit, the instantaneous current is zero when the instantaneous voltage is maximum. Connected to the source may be a:
(a) | pure inductor. |
(b) | pure capacitor. |
(c) | pure resistor. |
(d) | combination of an inductor and a capacitor. |
Choose the correct option:
1. | (a), (b), (d) |
2. | (b), (c), (a) |
3. | (c), (d), (a) |
4. | (a), (d), (c), (b) |