Description : What ammeter is mostly used in measuring high frequency currents?
Last Answer : thermocouple
Description : In a moving coil ammeter, a ___ is connected in series with the coil to compensate for temperature variations
Last Answer : swamping resistors
Description : For a dynamometer to be able to measure high current, a ___ should be used.
Last Answer : current transformer
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 : 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 : A measure of consistency or repeatability of measurements is called. ___
Last Answer : precision
Description : The time interval that a waveform is high (or low) is the ___ of the signal.
Last Answer : pulse width
Description : High sensitive DC voltmeter provides accurate reading when measuring ___ circuits.
Last Answer : high resistance
Description : Error in ammeter reading is due to
Last Answer : insertion
Description : Decreasing the value of the shunt resistor of an ammeter, it current measuring capability
Last Answer : increases
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 : 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 : 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 do you call of an instrument that depends for its operation on the reaction between magnetic flux set up by currents in fixed windings and other currents set up by electromagnet induction in movable conducting parts?
Last Answer : induction instrument
Description : How can electric currents be induced with a coil and a magnet?
Last Answer : by moving either the magnet or the coil
Description : ___ has a series RC combination in one arm and a parallel RC combination in the adjoining arm and used as a notch filter in harmonic distortion analyzer.
Last Answer : wein bridge
Description : When the capacitors of a Wein Bridge are replaced by inductors, the bridge becomes ___
Last Answer : Wein Inductance Bridge
Description : Induction type instruments are mostly used as ___
Last Answer : watt-hour meter
Description : For amplitude measurements, ___ scale is calibrated in either volts per centimeter (V/cm), or millivolts per centimeter (mV/cm)
Last Answer : vertical
Description : When the meter is unsufficiently damped, it is considered as ___
Last Answer : underdamped
Description : A wheatstone bridge is balanced if ___
Last Answer : the ratio of resistors on one side of the bridge equals the ratio of resistors on the other side
Description : In VTVMS, ___ refers to the smallest signal that can be reliably measured
Last Answer : sensitivity
Description : The time interval between pulses is called ___
Last Answer : pulse delay
Description : ___ is used for measuring medium Q coils
Last Answer : Maxwell Bridge
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 : Error in voltmeter is due to ___
Last Answer : loading
Description : In an oscilloscope, ___ adjusts the brightness of the spot by chaning the current on the control grid.
Last Answer : intensity control
Description : For time measurements, ___ scale of the scope is used.
Last Answer : horizontal
Description : The ___ provides the visual display showing the form of the signal applied as a waveform on the front screen of a cathode ray oscilloscope
Last Answer : CRT
Description : ___ meter is the most sensitive
Last Answer : 1uA
Description : What bridge is used to measure high-Q inductors? (Q>10)
Last Answer : hay bridge
Description : A useful instrument for checking A.C. motor performance by measuring possible unbalanced currents is the _____________. A. hand or battery-operated megger B. vibrating-reed frequency meter C. hook-on voltmeter-ammeter D. D'Arsonval iron-vane probe
Last Answer : Answer: C
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 : What type of sensing element would you use to measure very low temperature ?
Last Answer : The sensing element used for measuring very low temperature is R. T. D. ( Resistance Temperature Detector )
Description : An electrodynamic meter used t measure power
Last Answer : wattmeter
Description : In RF and microwave system, what instrument is used to measure the incidental and reflected signals?
Last Answer : reflectometer
Description : A type of photometer used to measure reflection.
Description : Bridge used to measure both inductive and capacitive impedances at higher frequencies
Last Answer : radio-frequency bridge
Description : A bridge used to measure small resistances
Last Answer : Kelvin Bridge
Description : An electro pyrometer is an instrument used to measure?
Last Answer : high temperatures
Description : An instrument used to detect and measure the presence of electrical current is generally called
Last Answer : galvanometer
Description : A device used to mechanically measure the output power of a motor
Last Answer : dynamometer
Description : What do you call of the frequency-sensitive bridge in which two adjacent arms are resistances and other are RC combinations?
Last Answer : Wein Bridge
Description : Type of power-line frequency meter composed of vibrating iron reed placed in alternating magnetic field
Last Answer : Vibrating Reed Type
Description : What sensor provides a change of resistance with typical power range of 1uW to 10mW and with maximum frequency greater than 100GHz
Last Answer : thermistor sensor
Description : The frequency of rotation in some rotating machinery can be measured by a
Last Answer : stroboscope