Description : Prior to taking a resistance reading with a volt-ohm-milliammeter, the 'zero' setting must be adjusted. After clipping the two leads together, you find the adjustment knob will not return the pointer ... range setting B. weak batteries C. a faulty zero ohms knob D. a faulty meter movement
Last Answer : Answer: B
Description : The only use of voltage senstive meter movement
Last Answer : very low voltage measurement
Description : What is the most common type of meter movement?
Last Answer : D' Arsonval
Description : In meter movement, how do oyu prevent the meter from oscillating and overswing?
Last Answer : by damping
Description : Induction type instruments are mostly used as ___
Last Answer : watt-hour meter
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 : Current range extension in moving coil instruments can be achieved by placing a ___ in shunt with the instrument.
Last Answer : low resistance resistor
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 : An electrodynamic meter used t measure power
Last Answer : wattmeter
Description : Type of power-line frequency meter composed of vibrating iron reed placed in alternating magnetic field
Last Answer : Vibrating Reed Type
Description : When the meter is unsufficiently damped, it is considered as ___
Last Answer : underdamped
Description : It is the reciprocal of the full-scale current of a meter
Last Answer : sensitivity
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 : A meter when __ will become insensitive to small signals
Last Answer : overdamped
Description : Insulation resistance is measured by which meter?
Last Answer : megger
Description : Type of power-line frequency meter device utilizing a principle of balancing an indicator needle at center of a scale using magnetic fields opposing each other.
Last Answer : magnetic type
Description : A meter has a full-scale current of 50uA, what is its sensitivity?
Last Answer : Is=1/50uA=20kohm/V
Description : What is that meter that depends for its operation on the forces attraction and repulsion
Last Answer : electrostatic instrument
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 : A tunable RF instrument, which, by means of a sharp dip of an indicating meter, indicates resonance with an external circuit under test
Last Answer : dip meter
Description : What type of instrument is the watt-hour meter?
Last Answer : an integrating
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 : ___ meter is the most sensitive
Last Answer : 1uA
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 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 : The systematic errors which persist and have regular effects in the performance of a survey operation are due to (A) Carelessness (B) Faulty instrument (C) Inattention (D) None of these
Last Answer : (B) Faulty instrument
Description : Draw and explain a pressure gauge ? What is the used of a Hair spring ?
Last Answer : The parts of a pressure gauge are : ١. 'C' type Bourdon tube. ٢. Connecting link. ٣. Sector gear. ٤. Pinion gear. ٥. Hair Spring. ٦. Pointer. ٧. Dial. Uses of Hair Spring : Hair ... two purposes namely To avoid backlash error (eliminate any play into linkages). It serves as a controlling torque.
Description : What are the possible errors in induction (energy meter) measuring instruments?
Last Answer : a. Phase error: Field flux in induction meter does not lag 90° behind the supply voltage due to its resistance. This can be adjusted by copper shading rings, which are placed at the central limb of the ... to prevent rotation, when one of the holes comes under one of the pole of the shunt magnet.
Description : Which movement is the most expensive?
Last Answer : dynamometer
Description : Which is the best type of ammeter movement?
Last Answer : D'Arsonval
Description : How do we refer to errors caused by faulty logic and coding mistakes?
Last Answer : Bugs.
Description : Define calibration of instruments. Explain why calibration is needed for measuring instruments.
Last Answer : Calibration - It is a process of estimating the value of a quantity by comparing that quantity with a standard quantity. Need of calibration: - Calibration defines the accuracy and quality ... aim of calibration is to minimize any measurement uncertainty by ensuring the accuracy of test equipment.
Description : State the purpose of calibration of measuring instruments. Explain the procedure of calibration of D.C. voltmeter by using D.C. potentiometer.
Last Answer : Purpose of calibration : Calibration is the process of evaluating and adjusting the precision and accuracy of measuring equipment. Proper calibration of an instrument allows people to have a safe ... calibration curve can be drawn by plotting the percentage error against the measured voltages.
Description : calibration and the need of calibration for measuring instruments.
Last Answer : Calibration - It is a process of estimating the value of a quantity by comparing that quantity with a standard quantity. Need of calibration: - Calibration defines the accuracy and ... aim of calibration is to minimize any measurement uncertainty by ensuring the accuracy of test equipment.
Description : State two purposes of calibration of measuring instruments.
Last Answer : Purposes of calibration of measuring instruments: - The purpose of calibration is to ensure that readings of an instrument are consistent with other instruments. It is also important in determining the ... will need to be calibrated periodically to make sure it can function properly and safely.
Description : Error in voltmeter is due to ___
Last Answer : loading
Description : Error in ammeter reading is due to
Last Answer : insertion
Description : Error in ohmmeter is due to
Last Answer : battery aging
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 : A patient is resistant to caries but has a periodontal disease. In this case, sucrose in diet is important because: A. Sucrose is greatly involved in plaque development B. S. mutans produces ... with a continual supply of sucrose D. Existing plaque must continue to get sucrose in order to grow
Last Answer : A. Sucrose is greatly involved in plaque development
Description : An internal resistance is placed in series with the meter movement of which of the following instruments? A. AC ammeter B. DC ammeter C. DC voltmeter D. Frequency meter
Last Answer : Answer: C
Description : The motor starts when the start button in the illustration is pushed, but stops when the button is released the trouble is _________. EL-0007 A. the incorrect thermal overload coil B. a faulty 'M' coil C. a dirty contact on the Disc.Sw. at 'L3' D. a faulty holding relay contact
Last Answer : Answer: D
Description : Explain the calibration of single phase electronic energy meter using direct loading.
Last Answer : Calibration of Single-phase Electronic Energy Meter by Direct Loading Method: The following figure shows the arrangement of calibration for single phase electronic energy meter. A phase shifter is connected for ... are taken for different values of current at different power factors.
Description : With neat diagram explain calibration of energy meter by direct loading method.
Last Answer : Calibration of Energy Meter by Direct Loading Method: There are three methods for testing/calibration: 1. Long period dial test 2. Using rotary sub- standard meter 3. Using precision grade instruments All ... of substandard meter in kWh Then % error = [(D - DS)/DS] x 100