# Electrical measurements/Electrical Measurement MCQ Question Set 1 Sample Test,Sample questions

## Question: ` A Wheatstone bridge may not give accurate readings if _______`

1.t is not balanced

2.it is balanced

3.the voltage drop across the circuit is maximum

4.excessive current flows through the circuit

## Question: ` How can a Wheatstone bridge be used for the measurement of physical parameters?`

1. in conjunction with a rectifier

2.along with an op amp

3. by connecting it to a thermistor

4.by making use of a transducer

1. high

2.low

3.medium

4.inaccurate

## Question: ` One of the simplest applications of a Wheatstone bridge is _____`

1.voltage measurement

2.current measurement

3.light measurement

4.power measurement

1.cm/A

2.m/mA

3.mm/ÂµA

4.inch/nA

## Question: ` The arms consisting of the resistances R1 and R2 are called _____`

1.resistance arms

2.impedance arms

3.source arms

4. ratio arms

## Question: `A galvanometer is used as a _____`

1. current source

2.voltage source

3.null detector

4.input impedance

## Question: `Accuracy of bridge circuit depends on _____`

1.component values

2.null detector

3.voltage source

4.current source

## Question: `Amount of deflection of the galvanometer depends on ______`

1. resistance of the ratio arms

2.sensitivity

3.current flowing through the bridge

4. emf across the circuit

## Question: `Balance condition can be obtained by _______`

1. varying the standard resistance R3

2. varying the resistance arms R1 and R2

3.keeping the unknown resistance R4 constant

4.by making use of a null detector

## Question: `By using the variations on a Wheatstone bridge we can _______`

1.measure quantities such as voltage, current and power

2.measure high resistance values

3.measure quantities such as complex power

4.measure quantities such as capacitance, inductance and impedance

## Question: `Commonly used D.C. bridges are ____`

1.Schering and Anderson

2.Maxwell inductance and capacitance

3.DeSauty and Wagner

4.Wheatstone and Kelvin

## Question: `Cost of maintenance of Wheatstone bridge is ______`

1.low

2.high

3.depends on the components

4.depends on the source e.m.f

## Question: `Effect of high dc on Wheatstone bridge.`

1. no effect

2. not susceptible

3.burns the circuit

4. increases the temperature

## Question: `Heating effect in the Wheatstone bridge can be avoided by ______`

1.using an expensive emf source

2.limiting current to a safe value

3.using heating sinks

4.immersing the setup in ice

## Question: `How is thermal emf generated?`

1.when current flows

2.when voltage is applied

3.when the null detector is connected

4.when dissimilar metals come in contact

## Question: `In control applications, one arm of the bridge circuit contains a _____`

1.capacitive element

2.resistive element

3. inductive element

4.impedance element

## Question: `Resistance R4 is known as _______`

1. standard resistance

2.unknown resistance to be measured

3.resistance arm

4. input resistance

## Question: `Sensitivity is defined as _____`

1.amount of voltage per unit current

2.amount of power per unit voltage

3.amount of resistance per unit voltage

4. amount of deflection per unit current

## Question: `Telephone companies make use of the Wheatstone bridge for ______`

1.measuring the telephone resistance

2.computing the line strength

3.maintaining dialtone

4.locating the cable faults

1. standard arm

2.resistance arm

3.accurate arm

4.known arm

## Question: `The balance condition of a Wheatstone bridge depends on the _____`

1.ratio of arms R1 and R1

2.ratio of arms R3 and R4

3.emf source and null detector

4.current source and power source

## Question: `The bridge circuit can be used in _______`

1. high voltage circuits

2.low power circuits

3.control circuits

4.digital integrated circuits

## Question: `The main error when measuring low resistances is _____`

1.power dissipation of the arms

2.voltage drop across the emf source

4.current flowing through the circuit

## Question: `The opposite two ends of a Wheatstone bridge consist of ____`

1.voltage and current source

2.e.m.f and null detector

3.resistance and capacitance

4.inductance and impedance

1.Kelvin

2.Schering

3.Anderson

4.Wheatstone

## Question: `The source of error in a Wheatstone bridge is due to _____`

1.range of galvanometer used

2.type of the source of emf used

3. limiting errors of the three known resistances

4. balance condition

## Question: `The types of faults in a telephone line are ________`

1.line to line or line to ground

2.triple line to line or line to ground

3. open circuit and short circuit

4.symmetrical and unsymmetrical

1.Sv = eâ„Î¸

2.Sv = Î¸â„e

3.Sv = 1â„e

4.Sv = 1â„Î¸

## Question: `The Wheatstone bridge is used for the measurement of ______`

1.1á¿¼ to a few megaohms

2.1ká¿¼ to a few megaohms

3. 1Má¿¼ to a few gigaohms

4.1má¿¼ to a few ohms

## Question: `Thermal compensation can be provided in a Wheatstone bridge by ____`

1. using more than one resistive sensor

2.making use of a heat sink

3.using cooling fans

4. immersing the circuit into a liquid

## Question: `Thermal emf can be prevented by _______`

1. using more sensitive galvanometers

2.using similar metals

3.by separating the dissimilar metals

4.reducing the supply emf

## Question: `Unit of voltage sensitivity is ______`

1.volts per degrees

2.amps per ohms

3.degrees per volts

4.watts per amps

## Question: `What are the physical parameters that are to be controlled when a bridge is used in control applications?`

1.area and volume

2.mass and weight

3.pressure and temperature

4.current and voltage

## Question: `What happens to the balance condition, if the source and detector are interchanged?`

1. increases by a factor of 2

2.reduces to half

3. remains unchanged

4. independent of the type of source and detector

## Question: `What is connected between the two ends of a Wheatstone bridge?`

1.current and voltage source

2.ammeter and voltmeter

3. battery and galvanometer

4.ohmmeter and wattmeter

## Question: `What is the effect of galvanometer on measurement of high resistance?`

1.no effect

2.depends on the e.m.f source

3. galvanometer becomes insensitive to an imbalance

4.depends on the type of galvanometer used

## Question: `What is the effect of heat on the resistances in a Wheatstone bridge?`

1.no effect

2.increases the voltage drop across the circuit

3.decreases the current flowing through the circuit

4.causes a permanent change in the resistance values

## Question: `What is the effect of lead wires on the Wheatstone bridge?`

1.no effect

2.stabilizes the system

3.desensitizes the system

4.increases the resistance of the circuit

## Question: `What is the effect of the increase in temperature on the resistance elements?`

1.directly proportional

2. independent

3. inversely proportional

4.changes by a factor of 10

## Question: `What is the main source of error in a null detector?`

1. lower current detection ability

2.insufficient sensitivity of the null detector

3.wiring resistance

4.power dissipation

## Question: `What is the relation between the sensitivity and deflection for a galvanometer?`

1.directly proportional

2.inversely proportional

3.independant of each other

4.depends on the type of galvanometer used

## Question: `Wheatstone bridge canâ€™t be used for measurement of _____`

1.high resistance

2.medium resistance

3.low resistance

4.accurate resistance

## Question: `Wheatstone bridge consists of ______`

1. 4 resistive arms

2.2 resistive arms

3.6 resistive arms

4. 8 resistive arms

## Question: `Wheatstone bridge is a ________`

1.a.c. bridge

2.d.c. bridge

3.high voltage bridge

4.power dissipation bridge

## Question: `Wheatstone bridge is used to measure resistance in the range of _____`

1. 1Î© to a few megaohms

2. 10kÎ© to a few megaohms

## Question: `Wheatstone bridge is used to measure the d.c. resistance of various types of wires for _____`

1.determining their effective resistance

2.computing the power dissipation

3.quality control of wire

4.maintaining a source of constant e.m.f

## Question: `Wheatstone bridge works on the principle of _____`

1.full deflection

2.partial deflection

3.no deflection

4.null deflection

## Question: `When current passes through the resistances in the Wheatstone bridge what happens?`

1.voltage drop occurs

2.null detector burns

3.back emf is induced

4.temperature increases due to power dissipation

## Question: `When the bridge is balanced, what is the current flowing through the galvanometer?`

1. 0

2.depends on the ratio arms R1 and R2

3.varies by a factor of 2

4.depends on the type of null detector used

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