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 ?

Related Mcqs:

1. 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)

2. 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

3. An emf of 5 volt is produced by a self inductance, when the current changes at a steady rate from 3 to 2 ampere in 1 millisecond. The value of self inductance is_______?

   A. zero
   B. 5 H
   C. 5000 H
   D. 5 mH

   Submitted by: Tauseef Ali

4. 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

5. 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

6. 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

7. Coil of a galvanometer is suspended in a radial magnetic field so that the deflecting torque on the coil is always___________________?

   A. BINA cosa
   B. BINA sina
   C. BINA tana
   D. BINA

8. If the plane of the rectangular coil is parallel to the magnetic field (i.e radial magnetic field) the torque on the coil is_____________________?

   A. τ = NIAB cosφ
   B. τ = NIAB sinφ
   C. τ = NIAB tanφ
   D. τ = NIAB

9. A moving coil galvanometer of resistance 100? gives half scale deflection for a current of 20mA. What will be the potential difference across it ?

   A. 4 volt
   B. 5 volt
   C. 2 volt
   D. 0.4 volt

10. An alternating current is represented by the equation I = I∫sinπt which of the following equation represents an alternating current of frequency and amplitude twice that of the above current ?

    A. I = 2I∫Sin(πt/2)
    B. I = 2I∫Sin(2πt)
    C. I = 2ISinπt
    D. I = I∫sin(2πt)