Maxwell's inductance bridge

Q. The bridge method commonly used for finding mutual inductance is

1. Heaviside Campbell bridge
2. Schering bridge
3. De Sauty bridge
4. Wien bridge

Q. The Maxwell's bridge shown in the figue is at balance. The parameters of the inductive coil are

1. $R=R_2{R}_3/R_4,L=C_4{R}_2{R}_3$
2. $L=R_2{R}_3/R_4,R=C_4{R}_2{R}_3$
3. $R=R_4/R_2{R}_3,L=1/\left(C_4{R}_2{R}_3\right)$
4. $L=R_4/R_2{R}_3,R=1/\left(C_4{R}_2{R}_3\right)$

Q. A high Q coil having distributed (self) capacitance is tested with a Q-meter. First resonance at ${\omega }_1={10}^6$ rad/s is obtained with a capacitance of 990 pF. The second resonance at ${\omega }_2=2\times {10}^6$ rad/s is obtained with a 240 pF capacitance. The value of the inductance (in mH) of the coil is (up to one decimal place)

1. 1

Q. The bridge shown in figure is used to measure the quality factor of coil. Which is represent by a parallel combination of resistance $R_p$ and inductance $L_p$, the bridge is balance at 100 Hz, supply frequency.



Choose the correct statement(s).

1. The value of unknown resistance $R_p$ is $8.4k\Omega$
2. The value of unknown inductance $L_p$ is 6.3 mH
3. The quality factor of coil will be 2122.06
4. Both $R_p$ and $L_p$ are independent of frequency

Q. In the a.c. bridge circuit shown in figure, at balance the parameters of the coil are calculated to be 50 mH and $20\Omega .$ Another coil is connected in parallel to the previous coil and balance is restored by changing $R_{2}to2.5k\Omega .$ The parameters of the new coil are then

1. $25mH,20\Omega$
2. $50mH,20\Omega$
3. $50mH,10\Omega$
4. $100mH,40\Omega$

Q. The bridge circuit shown in the figure below is used for the measurement of an unknown element $Z_x$. The bridge circuit is best suited when $Z_x$ is a

1. low resistance
2. high resistance
3. low Q inductor
4. lossy capacitor

Q. The inductance of a coil is measured using the bridge shown in the figure. Balance (D = 0) is obtained with $C_1=1nF,R_1=2.2M\Omega ,R_2=22.2k\Omega ,R_4=10k\Omega .$ The value of the inductance $L_x$ (in mH) is

1. 222

Q. A Q-meter having an insertion resistance of $0.02\Omega$ is used to measure the inductance of a coil. Resonance occurs at an angular frequency of ${10}^6$ rad/sec with a capacitance of 40 pF. The inductance of the coil is

1. $250\mu H$
2. 2.5 mH
3. 25 mH
4. 0.25 H

Q. In the bridge circuit shown, the inductors are loss free. At bridge balance the value of inductance 'L' is_________mH.

1. 40

Q. The resistance and inductance of an inductive coil are measured using an AC bridge as shown in the figure. The bridge is to be balanced by varying the impedance $Z_2.$

For obtaining balance, $Z_2$ should consists of element(s)

1. R and C
2. R and L
3. L and C
4. Only C

Q. In the ac bridge shown in figure the detector D reads zero. Then Z is made of

1. 50 mH in parallel with $50\Omega$
2. 50 mH is series with $50\Omega$
3. 50 nF in series with $10\Omega$
4. 50 nF in parallel with $5\Omega$

Q. Inductance is measured by

1. Maxwell bridge
2. Wien bridge
3. Schering bridge
4. Kelvin bridge