A voltage V = V0 cos ωt is applied across a resistor of resistance R the average power dissipated per cycle in the resistor is given by___________?
A. V√/√2R
B. V/√2√R
C. V02/√2R
D. 2/√2√R
n an LCR series circuit, if V is the effective value of the applied voltage VR is the voltage across R VL is the effective voltage across L & Vc is the effective voltage across C then_______________?
n an LCR series circuit, if V is the effective value of the applied voltage VR is the voltage across R VL is the effective voltage across L & Vc is the effective voltage across C then_______________?
IA. V = VR+VL+VC
B. V2 = VR2+VL2+VC2
C. V2 = VR2+(VL-VC)2
D. V2 = VL2+(VR-VC)2
The phase angle between the voltage and the current in an AC circuit consisting of a resistance is______________?
The phase angle between the voltage and the current in an AC circuit consisting of a resistance is______________?
A. Zero
B. 45°
C. 90°
D. 180°
Choose the correct statement. In the case of AC circuit ohms law holds for_______________?
Choose the correct statement. In the case of AC circuit ohms law holds for_______________?
A. Peak values of voltage and current
B. Effective values of voltage and current
C. Instantaneous values of voltage and current
D. All of the above
An inductive coil has a resistance of 100Ω. When an AC signal of frequency 1000Hz is fed to the coil the applied voltage leads the current by 45Ω. What is the inductance of the coil ?
An inductive coil has a resistance of 100Ω. When an AC signal of frequency 1000Hz is fed to the coil the applied voltage leads the current by 45Ω. What is the inductance of the coil ?
A. 10mH
B. 12mH
C. 16mH
D. 20mH
An A.C series circuit containing 4Ω resistance and 3Ω inductive reactance. The impedance of the circuit is______________?
An A.C series circuit containing 4Ω resistance and 3Ω inductive reactance. The impedance of the circuit is______________?
A. 1Ω
B. 5Ω
C. 7Ω
D. 7Ω
At resonance the value of the power factor in an L-C-R series circuit is_______________?
At resonance the value of the power factor in an L-C-R series circuit is_______________?
A. Zero
B. 2
C. 1
D. Not definite
A choke is used as a resistance in_________________?
A choke is used as a resistance in_________________?
A. DC circuit
B. AC circuits
C. Both AC and DC circuit
D. Full wave rectifier circuit
A 10Ω electric heater is connected to a 220V 50Hz mains supply. What is the peak value of the potential difference across the heater element ?
A 10Ω electric heater is connected to a 220V 50Hz mains supply. What is the peak value of the potential difference across the heater element ?
A. 220V
B. 220/ 2V
C. 110V
D. 220 √2V
The frequency of a circuit consisting of a capacitance C and a resistor R is________________?
The frequency of a circuit consisting of a capacitance C and a resistor R is________________?
A. C/R
B. R/C
C. 1/RC
D. 1/ 2RC