FREE Bachelor of Electrical Engineering Measurement and Instrumentation Questions and Answers
What relationship does the balance equation have to frequency?
The balance equation of a high voltage Schering bridge is independent of the circuit's operating frequency. Only the balance condition in a bridge circuit is detected by a detector.
What relationship does the voltage ratio have with frequency?
The frequency also changes as the voltage ratio does. It depends on the leakage reactance as well as the relative importance of the core loss component Io. The effects brought on by the voltage ratio and the frequency change conflict with one another.
The protecting arm is which of the following?
In a Wagner earth device, the series combination of R and C creates a potential divider across the ratio arms. The guard arm is another name for it.
The definition of a multiplier is
A multiplier basically acts as a non-inductive, high resistance device that increases the D.C. voltmeter's measuring range. A low range D.C. voltmeter is connected in series with a multiplier.
The following situations call for the usage of a Schering bridge:
Both low and high voltages can be used with a Schering bridge. The main application of a Schering bridge is the highly accurate measuring of tiny capacitances at low voltages.
The most sensitive detector for a single frequency value is which one of the following?
The balance state is discovered using a vibration galvanometer. The oscillator is utilized as a supply voltage source. For a single frequency value, the tuned detector has the highest sensitivity.
Which of the following describes an equilibrium for a bridge?
No current passes through the headphones used in the AC bridge circuit when it is in balance. The detector thus detects no deflection at the equilibrium condition.
Which of the following is an equation of balance to calculate resistance?
The balance equation R1 = R2 R3 R4 is used to calculate the resistance in an Anderson's bridge. R2, R3, and R4 are known non-inductive resistances in this scenario.
By _________, inductance control is attained.
Resistances R2 and R3 in an inductance comparison bridge can change. To manage the bridge's inductance, the value of resistance R2 is changed.
Raising the second burden ______
A potential transformer's secondary current grows as the secondary burden of the transformer rises. The primary current also grows as a result.
Which of the following approaches is most frequently used to gauge low resistance?
Low resistances of the order of 1 or less are measured using Kelvin's double bridge. The voltage across the circuit and the current flowing through it are measured using the ammeter-voltmeter method.
A C.T.'s windings are
The windings of a C.T. are wound over one another using Bakelite cylinders. The apparatus is fixed to a steel tank sheet that contains transformer oil.
The method of ________ yields an unknown capacitance value.
For determining the state of the balance, a tuned circuit is used. The vibration galvanometer serves the same function. Comparing an unknown value of capacitance to a known value yields the unknown value.For determining the state of the balance, a tuned circuit is used. The vibration galvanometer serves the same function. Comparing an unknown value of capacitance to a known value yields the unknown value.
What may be measured using Maxwell's Inductance Capacitance Bridge?
DeSauty's Bridge and Schering Bridge should be used to measure capacitance. Using Wien's Bridge, frequency can be measured. Heaviside and Campbell's Bridge are used to measure mutual inductance.
Which of the above measuring techniques does a bridge circuit use?
An analog bridge circuit employs a comparison measurement technique. The bridge in this method compares an unknown component's value to the standard value of a known component.
Which of the above techniques is used to test medium resistance?
Anderson Bridge is not used for measuring resistance, and the Direct-Deflection method is used to test high resistance. Kelvin's double bridge method is used to measure low resistance.