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 : How many sidebands are present in the J3E mode? A. Two sidebands and a carrier B. One upper sideband C. One lower sideband D. Two carriers and one sideband
Last Answer : B. One upper sideband
Description : What does a transmitter output start from 3-15 psi or (0.2 - 1 Kg/Cm2) or 4 - 20 ma. etc. ?
Last Answer : The transmitter output stance from what is known as "live zero". This system has specific advantages : 1. The systems automatically alarms when the signal system becomes inoperative. ... transmitter operating, but transmitting a zero measurement and a failure, in the signal system.
Description : How will you check zero of a level D.P. transmitter while is line ?
Last Answer : ١. Close both the isolation valves. ٢. Open the vent valve on L.P. leg and H.P. leg drain. ٣. Check and adjust zero if necessary.
Description : How will you commission D.P. transmitter in field in pressurized vessel.
Last Answer : ١. Close both the isolation valves, Vent the H.P. side. ٢. Fill it with the sealing liquid. ٣. Open the L.P. side vent valve. ٤. Adjust zero with suppression spring. ٥. Close the L.P. side vent valve. ٦. Open both the isolation valves.
Description : How is D.P. transmitter applied to a close tank ?
Last Answer : In close tank the bottom of the tank is connected to the high pressure side of the transmitter and top of the tank in connected to L.P. side of the transmitter. In this way the vessel pressure is balanced.
Description : How will you calibrate an absolute pressure transmitter using vacuum manometer. Range 0-400mm abs ?
Last Answer : The procedure for calibration is as follows : Connect air supply to the transmitter. Connect a test gauge of 0-1.4 Kg/cm2 to the output. Connect Vacuum pump with tee off to the manometer. Apply 760 ... nearest ) and adjust zero. Apply 360 mm Vacuum adjust span. ( 760 - 360 = 400 mm abs. )
Description : How do you do a zero check on a D.P. transmitter ?
Last Answer : Close one of the valve either H.P. or L.P. open the equalizing valve. The O/P should read zero.
Description : How do you calibrate a D. P. transmitter?
Last Answer : The following steps are to be taken which calibrating: 1. Adjust zero of the Tx'r. 2. Static pressure test : Give equal pressure on both sides of the transmitter. Zero should not shift. If ... pressure to high pressure side of the transmitter and adjust the span. 6. Adjust zero again if necessary.
Description : Type of emission produced by one of the early radio transmitter in trains of damped RF ac waves where its oscillator is coupled to a long wire antenna, normally used in radio telegraph and having sidebands on its carrier. A. Digital emission B. Key emission C. Cycle emission D. Spark emission
Last Answer : D. Spark emission
Description : A dynamometer instrument is mainly used as a/an
Last Answer : wattmeter
Description : An instrument of device having recognized permanent of stable value that is used as a reference.
Last Answer : standard instrument/device
Description : The scale of a hot-wire instrument is a/an ___function
Last Answer : squared
Description : Moving-iron instrument has a/an scale
Description : A device or instrument, which delivers signals of precise frequency and amplitude, usually over a wide range
Last Answer : signal generators
Description : When both deflecting and controlling torque act, the pointer of an indicating instrument comes to
Last Answer : rest
Description : The smallest change in a measured variable to which an instrument will respond.
Last Answer : resolution
Description : In RF and microwave system, what instrument is used to measure the incidental and reflected signals?
Last Answer : reflectometer
Description : This instrument measures temperatures by electric means, especially temperatures beyong the range of mercury thermometers
Last Answer : pyrometer
Description : Which instrument is the most sensitive?
Last Answer : permanen-magnet moving coil
Description : A device or instrument able to generate noise with accurate voltage for test purposes
Last Answer : noise generator
Description : Resistance measuring instrument particularly used in determining the insulation resistance
Last Answer : Megger/Megaohmmeter
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 : Current range extension in moving coil instruments can be achieved by placing a ___ in shunt with the instrument.
Last Answer : low resistance resistor
Description : Determine which is not a dynamic instrument
Last Answer : Logic
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 : As the deflection of the moving system increases, the controlling torque in an indicating instrument.
Last Answer : increases
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 : An indicating instrument whose movable coils rotate between two-stationary coils, usually used as wattmeter
Last Answer : electrodynamometer
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 : Permanent-magnet moving coil instrument can be used in
Last Answer : dc work only
Description : Basically, a PMMC instrument can be used only in
Last Answer : dc measurements
Description : Another name for PMMC instrument
Last Answer : D'Arsonval
Description : A force in analog instrument which quickly brings the moving system to rest in its final position.
Last Answer : damping force
Description : If the pointer of an indicating instrument is in motion, then what opposes deflecting torque?
Last Answer : damping and controlling torque
Description : What is the force acting on the pointer of an indicating instrument when it is in motion?
Last Answer : controlling, damping and deflecting torques
Description : What is this instrument or circuit that has four or more arms, by means of which one or more of the electrical constance of an unknown component may be measured?
Last Answer : bridge
Description : Dynamometer type instrument can be used for
Last Answer : both dc and ac works
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 : Indicating instrument is assumed to be most accurate at what part of the scale?
Last Answer : at half or full
Description : An instrument in which the magnitude of the measured quantity is indicated by means of pointer.
Last Answer : analog instrument
Description : What type of instrument is the watt-hour meter?
Last Answer : an integrating
Description : What kind of instrument is an ammeter?
Last Answer : an indicating
Description : An instrument used for measuring the amount of current flowing in a circuit.
Last Answer : ammeter
Description : The pointer of an indicating instrument is generally made of
Last Answer : aluminum
Description : What is the typical full-scale deflection current of a moving coil instrument?
Last Answer : 50mA
Description : Explain the working an electronic leveltrol.
Last Answer : The variation in buoyancy resulting from a change in liquid level, varies the net weight of the displacer increasing or decreasing the load on the torque arm. This change is directly ... change proportional to the rotor displacement, which is converted and amplified to a D.C. current.
Description : One of the basic functions of electronic circuit is
Last Answer : the generation and manipulation of electronic waveshapes