EM Quiz on Unit-V

Maxwell’s Inductance-Capacitance bridge is used foe measurement of inductance of:

• Low q coils

• medium Q coils

• high Q coils

• low and medium Q coils

The advantage of Hay’s bridge over Maxwell’s Inductance-Capacitance bridge is because---

• Its equations for balance do not contain any frequency term

• It can be used for measurement of inductance of high Q coils

• It can be used for measurement of inductance of low Q coils

• None of the above

In D’Sauty’s bridge (unmodified form) it is---------

• Possible to obtain balance even if both the capacitors are imperfect

• Possible to obtain balance if one of the capacitors is perfect

• Possible to obtain balance only if both the capacitors are perfect

• All of the above

Frequency can be measured by using----------------------------

• Maxwell’s bridge

• Schering bridge

• Heaviside cambell bridge

• Wien bridge

Wagner’s earth device are used in ac bridge circuits for------

• Eliminating the effect of earth capacitances

• Eliminating the effect of inter-component capacitance

• Eliminating the effect of stray electrostatic fields

• Shielding the bridge elements

A Wheatstone bridge cannot be used for precision measurements because errors are introduced into on account-----------------

• Resistance of connecting leads

• thermo-electric emfs

• contact resistances

• All of the above

Low resistances re provided with four terminals------

• To facilitate the connection of current and potential circuits

• In order that the resistance value becomes definite irrespective of the nature of contacts at the current terminals

• To eliminate the effect of thermo-electric emfs

• To eliminate the effect of leads

In a Kelvin’s double bridge two sets of readings are taken when measuring a low resistance, one with the current in one direction and the other with direction of current reversed. This is done to-------------------------------

• Eliminate the effect of contact resistance

• eliminate the effect of resistance of leads

• correct for changes in battery voltage

• eliminate the effect of thermo-electric emfs

AC bridges are used for the measurement of----------------------

• Resistances

• Resistances and Inductances

• Inductances and capacitances

• Resistances, inductances and capacitances

The commonly used detectors in ac bridges is/are-------

• Head phones

• Vibration Galvanometers

• Tuned amplifiers, head phones

• Head phones, tuned amplifiers, vibration galvanometers