Description : What is the typical full-scale deflection current of a moving coil instrument?
Last Answer : 50mA
Description : In a moving coil ammeter, a ___ is connected in series with the coil to compensate for temperature variations
Last Answer : swamping resistors
Description : Permanent-magnet moving coil instrument can be used in
Last Answer : dc work only
Description : What is the reason why the scale of a permanent-magnet moving coil instrument is uniform?
Last Answer : because it is spring controlled
Description : Induction type instruments are mostly used as ___
Last Answer : watt-hour meter
Description : A moving system force in an analog instruments which causes the moving system to deflect from its zero position.
Last Answer : deflecting force
Description : A moving system force in analog instruments which ensures that the deflection of the pointer for a given value of measured quantity always has the same value
Last Answer : controlling force
Description : Which of the following forces does not act on the moving systems of analog instruments?
Last Answer : an electrostatic force
Description : A small swamping resistance is connected in series with operating coil of a moving coil ammter in order to compensate for the effects of ____
Last Answer : temperature variation
Description : Meters with moving coil are normally used for measuring ____
Last Answer : dc only
Description : What is the typical full-scale voltage across a moving coil voltmeter?
Last Answer : 50mV
Description : Moving-iron instrument has a/an scale
Last Answer : squared
Description : As the deflection of the moving system increases, the controlling torque in an indicating instrument.
Last Answer : increases
Description : A force in analog instrument which quickly brings the moving system to rest in its final position.
Last Answer : damping force
Description : A device or instrument, which delivers signals of precise frequency and amplitude, usually over a wide range
Last Answer : signal generators
Description : This instrument measures temperatures by electric means, especially temperatures beyong the range of mercury thermometers
Last Answer : pyrometer
Description : In an oscilloscope, ___ adjusts the brightness of the spot by chaning the current on the control grid.
Last Answer : intensity control
Description : For a dynamometer to be able to measure high current, a ___ should be used.
Last Answer : current transformer
Description : Decreasing the value of the shunt resistor of an ammeter, it current measuring capability
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 permanent magnet moving coil instrument gives full scale deflection of 25mA when a voltage of 75mV is applied across it. Calculate: (i) Resistance of shunt required for full scale deflection of 150 A. (ii) Series resistance for full scale deflection of 500 V.
Last Answer : Answer :
Last Answer : A moving-coil permanent-magnet instrument can be used as ammeter by using a low resistance shunt.
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 used to detect and measure the presence of electrical current is generally called
Last Answer : galvanometer
Description : An instrument used for measuring the amount of current flowing in a circuit.
Last Answer : ammeter
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 : 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 : ___ ammeter is used to measure high-frequency currents.
Last Answer : thermocouple
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 that a waveform is high (or low) is the ___ of the signal.
Last Answer : pulse width
Description : The time interval between pulses is called ___
Last Answer : pulse delay
Description : A measure of consistency or repeatability of measurements is called. ___
Last Answer : precision
Description : ___ is used for measuring medium Q coils
Last Answer : Maxwell Bridge
Description : Error in voltmeter is due to ___
Last Answer : loading
Description : For time measurements, ___ scale of the scope is used.
Last Answer : horizontal
Description : High sensitive DC voltmeter provides accurate reading when measuring ___ circuits.
Last Answer : high resistance
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 : Calculate the shunt resistance needed to increase the FSD of an ammeter 5 times if the meter resistance is 1kohm
Last Answer : 250ohms
Description : Electrostatic instruments are exclusively used as
Last Answer : voltmeters
Description : Which electrical instruments below is the most sensitive?
Last Answer : PMMC
Description : Attraction and repulsion instruments are considered
Last Answer : moving iron instruments
Description : Errors due to frictions of the meter movement, incorrect spring tension, improper calibration or faulty instruments:
Last Answer : instrument errors
Description : How can electric currents be induced with a coil and a magnet?
Last Answer : by moving either the magnet or the coil
Description : To send 10% of the main current through a moving coil galvanometer of resistance `99omega`, the shunt required is –
Last Answer : To send 10% of the main current through a moving coil galvanometer of resistance `99omega`, the shunt ... `11Omega` C. `10Omega` D. `9.9Omega`