Description : An ammeter has a full-scale deflection current of 100mA. If the same ammeter is used to measure a full-scale current of 1.0ampere, what is the value of the shunt resistor in ohms if the voltage across the meter is 9.0 volts?
Last Answer : 10 ohms
Description : To increase the measuring capability of a moving-iron ac ammeter, a __ should be used.
Last Answer : different number of turns of coils
Description : An ammeter with an internal resistance of 50 ohm(s) is used to measure a current thorugh a lod resistor Rl = 1 kohm(s). Determine the percentage error of the reading due to ammeter insertion.
Last Answer : 50/(50+1k)*100 = 4.76%
Description : Calculate the shunt resistance needed to increase the FSD of an ammeter 5 times if the meter resistance is 1kohm
Last Answer : 250ohms
Description : What ammeter is mostly used in measuring high frequency currents?
Last Answer : thermocouple
Description : Current range extension in moving coil instruments can be achieved by placing a ___ in shunt with the instrument.
Last Answer : low resistance resistor
Description : What is the basic unit for measuring current flow?
Last Answer : ampere
Description : An instrument used for measuring the amount of current flowing in a circuit.
Last Answer : ammeter
Description : ___ ammeter is used to measure high-frequency currents.
Description : In a moving coil ammeter, a ___ is connected in series with the coil to compensate for temperature variations
Last Answer : swamping resistors
Description : Error in ammeter reading is due to
Last Answer : insertion
Description : Which is the best type of ammeter movement?
Last Answer : D'Arsonval
Description : Which of the ammeter below has no insertion error?
Last Answer : clamp-meter
Description : What kind of instrument is an ammeter?
Last Answer : an indicating
Description : Draw a potentiometer temp. Measuring circuits and explain its?
Last Answer : OPERATION : The input to the instrument is a measurement of some in the processes using a sensing element ( such as thermocouple ) or a device to produce direct voltage, which is the voltage (signal) ... to zero results ( null point ) the balancing ( servo motor is be longer driven )
Description : What are the primary elements for measuring pressure ?
Last Answer : The primary elements used for measuring pressure are : Bourdon tube. Diaphragm. Capsule. Bellows. Pressure Springs. The above are known as elastic deformation pressure elements. Type ... pressure. Pre.spring : Pressure springs of helical or spiral shape used for measuring high pressures.
Description : A four-arm bridge. All arms of which are predominantly resistive; used for measuring resistance
Last Answer : Resistance Bridge and Wheatstone Bridge
Description : An electronic measuring device that provide instantaneous visual indication of voltage excursions
Last Answer : oscilloscope
Description : Resistance measuring instrument particularly used in determining the insulation resistance
Last Answer : Megger/Megaohmmeter
Description : ___ is used for measuring medium Q coils
Last Answer : Maxwell Bridge
Description : This refers to a four-arm ac bridge used for measuring inductance against a standard capacitance.
Description : What is that instrument used for measuring the strength and direction of magnetic fields?
Last Answer : magnetometer
Description : Majority of analog measuring instrument utilizes one of the following effects.
Last Answer : magnetic effect
Description : High sensitive DC voltmeter provides accurate reading when measuring ___ circuits.
Last Answer : high resistance
Description : Refers to an ac bridge for measuring the inductance and Q of an inductor in terms of resistance, frequency and a standard capacitance.
Last Answer : hay bridge
Description : A common technique for measuring power at high frequency is to ______
Last Answer : employ a sensing element that converts the RF power to a measureable dc or low-frequency signal
Description : Which of the voltmeter is used for measuring high direct voltage (say 10kV)?
Last Answer : electrostatic
Description : Meters with moving coil are normally used for measuring ____
Last Answer : dc only
Description : What type of device is used to extend the current measuring capability of electrodynamic wattmeters?
Last Answer : Current transformers.
Description : A DC ammeter has resistance `0.1 Omega` and its current ranges `0-100 A`. If the range is to be extended to `0-500`, then the following shunt resistan
Last Answer : A DC ammeter has resistance `0.1 Omega` and its current ranges `0-100 A`. If the range is to be extended ... Omega` C. `0.025 Omega` D. `0.25 Omega`
Description : A galvanometer of 65 Ω resistance gives full scale deflection with 4 mA current. In order to convert it into ammeter, the range of 10 A is connected with it, the shunt resistance should be a) 0.1 Ω b) 0.2 Ω c) 0.06 Ω d) 0.03 Ω
Last Answer : d) 0.03 Ω
Description : What is the direction of current through the load resistor in the circuit shown in the illustration? EL-0085 A. Always from point 'Z' to the grounded end. B. Always from the grounded end to ... on the instantaneous polarity at point 'W'. D. It cannot be determined without a directional ammeter.
Last Answer : Answer: B
Description : A milli voltmeter of 25 milli volt range is to be converted into an ammeter of 25 ampere range. The value (in ohm) of necessary shunt will be
Last Answer : A milli voltmeter of 25 milli volt range is to be converted into an ammeter of 25 ampere range. The value (in ohm) ... 001` B. `0.01` C. 1 D. `0.05`
Description : Assertion : Resistance of an ammeter is less than the resistance of a milliammeter. Reason : Value of shunt required in case of ammeter is more than a
Last Answer : Assertion : Resistance of an ammeter is less than the resistance of a milliammeter. Reason : Value of ... . If Assertion is false but Reason is true.
Description : The purpose of resistor bank 'R1-R5' in the winch circuit shown in the illustration is to ______________. EL-0102 A. limit armature current in lower and 'series field' current in hoist to ... required speeds D. regulate the strength of the brake solenoid 'B1-B2' in both directions of operation
Last Answer : Answer: C
Description : How much current does an electrostatic voltmeter require through it to operate?
Last Answer : zero current
Description : It is the reciprocal of the full-scale current of a meter
Last Answer : sensitivity
Description : What is the device, which depends on the action of a movalbe permanent magnet, in aligning itself in the resultant field produced by a fixed permanent magnet or current- carrying coils whose axes are displaced by a fixed angle?
Last Answer : moving-magnet instrument
Description : A meter has a full-scale current of 50uA, what is its sensitivity?
Last Answer : Is=1/50uA=20kohm/V
Description : In an oscilloscope, ___ adjusts the brightness of the spot by chaning the current on the control grid.
Last Answer : intensity control
Description : An instrument used to detect and measure the presence of electrical current is generally called
Last Answer : galvanometer
Description : All voltmeters except one of the following are operated by the passage of current
Description : A type of meter that gives a precise reading of voltage, current or resistance where there is the generation of samples at the input and then feeds it to a digital read-out.
Last Answer : DMM
Description : For a dynamometer to be able to measure high current, a ___ should be used.
Last Answer : current transformer
Description : What is the typical full-scale deflection current of a moving coil instrument?
Last Answer : 50mA
Description : A galvanometer with 20 ohms coil resistence has a full-scale deflection of 10 mA. A 0.02 ohm is placed across the meter to increase its rating capacity. What is the new full scale current for the meter?
Last Answer : False.
Description : An instrument of device having recognized permanent of stable value that is used as a reference.
Last Answer : standard instrument/device
Description : A device or mechanism used to determine the value of a quantity under observation.
Last Answer : instrument
Description : The deviation of a reading from the expected value
Last Answer : error