A 44 mH inductor is connected to a 220 V, 50 Hz ac supply. The RMS value of the current in the circuit is:
1. 1.0 A
2. 15 A
3. 15.92 A
4. 14.29 A
Calculate the Q-value of a series LCR circuit with L = 2.0 H, C = 32 μF and R = 10 \(\Omega\).
1. 35
2. 20
3. 15
4. 25
The variation of EMF with time for four types of generators is shown in the figures. Which amongst them can be called AC voltage?
(a) | (b) |
(c) | (d) |
1. | (a) and (d) |
2. | (a), (b), (c), and (d) |
3. | (a) and (b) |
4. | only (a) |
The peak value of an alternating e.m.f. is 10 volts and its frequency is 50 Hz. At a time \(t=\frac{1}{600}~s,\) the instantaneous value of the e.m.f. will be:
1. | 1 volt | 2. | \(5 \sqrt{3}\) volts |
3. | 5 volts | 4. | 10 volts |
The time required for a 50 Hz sinusoidal alternating current to change its value from zero to the r.m.s. value will be:
1.
2.
3.
4.
A sinusoidal supply of frequency 10 Hz and r.m.s. voltage of 12 V is connected to a 2.1 capacitor. What is the r.m.s. value of current?
1. 5.5 mA
2. 20 mA
3. 26 mA
4. 1.6 mA
In a series RLC circuit, potential differences across R, L and C are 30 V, 60 V and 100 V respectively, as shown in the figure. The emf of the source (in volts) will be:
1. 190
2. 70
3. 50
4. 40
In a series LCR circuit, the phase difference between voltage across L and voltage across C is equal to:
1. | Zero | 2. | \(\pi\) |
3. | \(\pi \over 2\) | 4. | \(2\pi\) |
In a series LC circuit, if and is connected to a 100 V-50 Hz a.c. source, the impedance of the circuit is:
1.
2.
3.
4. None of these
When does the voltage in a series LCR circuit lead the current? (Given that resonant angular frequency)
1.
2.
3.
4. None of these