Description : In a moving coil ammeter, a ___ is connected in series with the coil to compensate for temperature variations
Last Answer : swamping resistors
Last Answer : In a dynamo-meter type of moving coil instrument a swamping resistance is provided inorder to: Provide equal time constant for moving coil and fixed coil, when used for ac measurement
Description : Meters with moving coil are normally used for measuring ____
Last Answer : dc only
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 : 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 : What is the typical full-scale voltage across a moving coil voltmeter?
Last Answer : 50mV
Description : What is the typical full-scale deflection current of a moving coil instrument?
Last Answer : 50mA
Description : Calculate the series resistance needed to convert a D' Arsonval meter with FSD of 100uA and a meter resistance of 1kohm to a voltmeter with 10V FSD.
Last Answer : Rs=10V/100uA - 1kohm = 99kohm
Description : How can electric currents be induced with a coil and a magnet?
Last Answer : by moving either the magnet or the coil
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 : In order to make an accurate measurement as possible, the internal resistance of a voltmeter must be
Last Answer : as high as possible
Description : A ____ operates on the magnetic attraction-repulsion principles.
Last Answer : milliameter
Description : A ____ is a device that can test all pins of an IC at the same time.
Last Answer : logic clip
Description : Moving coil in dynamometer wattmeter connected a) In series with fixed coil b) Across supply c) In series with load d) Across load
Last Answer : Ans: Across supply
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 : To increase the measuring capability of a moving-iron ac ammeter, a __ should be used.
Last Answer : different number of turns of coils
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 force in analog instrument which quickly brings the moving system to rest in its final position.
Last Answer : damping 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 : Majority of analog measuring instrument utilizes one of the following effects.
Last Answer : magnetic effect
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 : To limit the current flow through a DC voltmeter to as low a value as possible, the moving coil circuit is provided with a/an _____________. A. high series resistance B. high parallel resistance C. series inductor D. external shunt
Last Answer : Answer: A
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 :
Description : Which of the following bridges measures dc resistance?
Last Answer : Wheatstone bridge
Description : A dc bridge widely used for the accurate measurements of resistance
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 : A four-arm bridge. All arms of which are predominantly resistive; used for measuring resistance
Last Answer : Resistance Bridge and Wheatstone Bridge
Description : An AC bridge that measures inductance in terms of resistance and capacitance.
Last Answer : Owen's Bridge
Description : Resistance measuring instrument particularly used in determining the insulation resistance
Last Answer : Megger/Megaohmmeter
Description : Insulation resistance is measured by which meter?
Last Answer : megger
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 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 : 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 : A meter when __ will become insensitive to small signals
Last Answer : overdamped
Description : A bridge used to measure small resistances
Last Answer : Kelvin Bridge
Description : In the illustration, the diode between terminals 16 and 17 is to _________. EL-0046 A. insure that the voltage across the governor coil (EG-3P) never exceeds .6 VDC B. compensate for the ... heating up C. protect the electronic governor from counter EMF D. act as a filter to prevent hunting
Last Answer : Answer: C
Description : Moving coil in dynamometer wattmeter connected : - a) in series with fixed coil b) across supply c) in series with load d) across load
Last Answer : Moving coil in dynamometer wattmeter connected : - across supply
Last Answer : In Weston synchronoscope the moving coil is connected across bus-bars.
Description : When an operating motor is connected to the controller shown in the illustration, the a path of current flow through the circuit is ____________. EL-0010 A. 'L1', stop button, start button, coil 'CR', 'L2' B. 'L1' ... L2' D. 'L1', stop button, start button, 'CR' contact, 'M' contact, 'CR' coil, 'L2'
Last Answer : Answer: B
Description : _____________is a feature of an operating system that allows a computer to compensate for shortages of physical memory by temporarily transferring pages of data from RAM to disk storage. A. Flash memory B. Virtual memory C. Buffer D. None of the Above
Last Answer : B. Virtual memory
Description : The simplest method of controlling the terminal voltage of compound-wound DC generator is with a _____________. A. hand-operated field rheostat connected in series with the shunt field circuit B. ... in series with the load D. balance coil diverting neutral current through the shunt field
Description : A capacitor and a coil are connected in series. The capacitor is charged and allowed to discharge through the coil. The current that will then flow through the capacitor-coil combination will do ... but diminish steadily to zero z) oscillate at high frequency at first but then at slower frequency
Last Answer : ANSWER: Y -- OSCILLATE BUT DIMINISH STEADILY TO ZERO
Description : What is a filter used for ?
Last Answer : The half wave and full wave signals are pulsating D . C . voltages. The use of such voltages is limited to charging batteries, running D. C. motors, and a few other applications. What we really ... voltage from a battery. To get a constant voltage from this, we can use a capacitor input filter.
Description : What is Zener Diode ? What is a voltage Regulator ?
Last Answer : The breakdown region of a p n diode can be made very sharp and almost vertical Diodes with almost vertical breakdown region are known as Zever Diodes. A Zener diodes operating in the breakdown ... VOLTAGE REGULATOR : The output remains constant despite changes in input voltage due to Zever effect.
Description : What is transistor ? What are the different types ?
Last Answer : A transistor is a three lagged semi conductor device. Basically a transistor means (transfer - resister). Whether the transistor is pnp or npn it resembles two diodes (back to back). The one of the left ... transistor : Emitter - Base - Forward Bias. Collector - Base - Reverse Bias.