A. 1Ω
B. 5Ω
C. 7Ω
D. 7Ω
Related Mcqs:
- A 100µF capacitor with a 12V source in series having frequency 50Hz will offer a capacitive reactance of about______________?
A. 32Ω
B. 62Ω
C. 50Ω
D. 100Ω - 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 - 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° - Why should a resistance be introduced in a circuit in series deliberately ?
A. to increase current
B. to decrease current
C. to control current
D. just to give a good look to circuit - A wire of resistance R is coiled inductively so that its inductance is L. The impedance of the coil at a frequency of f is_______________?
A. (R+2πfL)
B. R+1/2πfL
C. (R2+f2L2)
D. (R2+4π2f2L2) - An alternating current of the r.m.s value of 4.0 A and frequency 50Hz flows in a circuit containing a 10Ω resistor. The peak current is then ?
A. 20A
B. 20.66A
C. 6.66A
D. 5.66A - If capacitance of L-C circuit is made four times then frequency of the circuit becomes___________________?
A. Twice
B. One half
C. Four times
D. None - 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 - 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 - A fuse is placed in series with the circuit to protect against__________________?
A. high power
B. high voltage
C. high current
D. over heating
