Consider the following statements An iron cored choke is non linear and passive

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Question
Consider the following statements
1. An iron cored choke is non linear and passive device.
2. A carbon resistor kept in sunlight is a time invariant and passive device.
3. A dry cell is a time varying and active device.
4. An air capacitor is time invariant and passive device.
Of these statements
Options
A. 1, 2, 3 and 4 are correct
B. 1, 2, 3 are correct
C. 1, 2, 4 are correct
D. 2 and 4 are correct

Correct Answer

1, 2, 3 and 4 are correct

More questions

1. A class A chopper has an input voltage of 200 V. T_on = 1.5 ms and T_off = 4.5 ms. The duty cycle, average output voltage and ripple factor respectively are
Options
A. 0.5, 100 V and 1
B. 0.25, 50 V and 3
C. 0.25, 50 V and 1
D. 0.5, 100 V and 3

2. The velocity factor of a transmission line depends on
Options
A. temperature
B. skin effect
C. relative permittivity of dielectric
D. none of the above

6. An LVDT is used to measure displacement. The LVDT feeds a Voltmeter of 0-5 V range through a 250 gain amplifier. For a displacement 0.5 mm the output of LVDT is 2 mV. The sensitivity of instrument is
Options
A. 0.1 V/mm
B. 0.5 V/mm
C. 1 V/mm
D. 5 V/mm

7. Consider the following statement: In case of a superconductor
1. B = 0
2. ?_r is high
3. diamagnetism is high
4. transition temperature varies with isotopic mass.
Of the above statements
Options
A. 1 and 2 are correct
B. 2, 3, 4 are correct
C. 1, 3, 4 are correct
D. 2, 4 are correct

8. An electron (charge -e) is rotating in a circular orbit of radius R, around a proton with charge +e at a constant angular velocity ?. The orbital magnetic dipole moment is
Options
A. 0.5 e? R²
B. e? R²
C. 2 e? R²
D. 0.5 e? R³

9. For a given value (n) of principle quantum number, the number of possible electronic states are
Options
A. n
B. n²
C. n³
D. n

10. A dielectric of relative permittivity ?_r is subjected to a homogeneous electric field E. The dipole moment P per unit volume is given by
Options
A. P = constant
B. P = ?₀ E
C. P = ?₀(?_r - 1) E
D. P = ?_r E

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