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) 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) 220V
(B) 220/ 2V
(C) 110V
(D) 220 √2V
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
What is the self-inductance of a coil in which an induced emf of 2V is set up when the current changes at the rate of 4 As-1 ?
(A) 0.5 mH
(B) 0.5H
(C) 2.0H
(D) 8.0H
When a pure inductor of inductance L and a pure capacitor of capacitance C are connected in parallel to a sinusoidal potential difference V the potential difference across both L & C will be_______________?
(A) Same
(B) Different
(C) At L will be more than at C
(D) At L will be less than at C
Ammeter connected in an AC circuit measures______________?
(A) The exact value of the current
(B) RMS value of the current
(C) The net value of the current
(D) The peak value of the current
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)
A vector can be multiplied by a number. The number may be_______________?
(A) Dimensionless
(B) Dimensional scalar
(C) Negative
(D) All A, B and C are correct