Description : At what point on a meter movement are the most accurate readings taken?
Last Answer : Midscale.
Description : What condition produces the 10-kHz error signal generated by the metering bridge in the HP- 431C power meter?
Last Answer : An unbalance in the metering bridge.
Description : An iris placed along the "b" dimension wall produces what kind of reactance?
Last Answer : Inductive.
Description : What happens to inductive reactance as frequency increases?
Last Answer : It increases.
Description : What happens to capacitive reactance as frequency increases?
Last Answer : It decreases.
Description : In a series-RLC circuit, what is the condition of the circuit if there is high impedance, low current, and low reactance voltages
Last Answer : Nonresonant (circuit is either above or below resonance)
Description : What is the capacitive reactance across a point-contact diode as compared to a normal junction diode?
Last Answer : Lower.
Description : What is the formula for determining total reactance in a series circuit where the values of XC and XL are known?
Last Answer : X = XL – XC or X = XC - XL
Description : What characteristic of a transistor is varied in a semiconductor-reactance modulator?
Last Answer : Collector-to-emitter capacitance.
Description : How does the reactance-tube modulator impress intelligence onto an rf carrier?
Last Answer : By changing the reactance of an oscillator circuit in consonance with the modulating voltage.
Description : What type of ranging circuit is most often used with a radar that requires extremely accurate range data?
Last Answer : Range gate or range step.
Description : A dc bridge widely used for the accurate measurements of resistance
Last Answer : Wheatstone bridge
Description : The bridge most suited for accurate measurement of relative permittivity of dielectric materials is (A) Carey Foster Bridge (B) Anderson’s bridge (C) Heaviside Bridge modified by Campbell. (D) Schering Bridge.
Last Answer : The bridge most suited for accurate measurement of relative permittivity of dielectric materials is Schering Bridge.
Description : In preparing to take insulation resistance readings on a main generator, the windings should be grounded for about 15 minutes prior to the test to _____________. A. allow accurate zeroing of the meter ... the windings D. help the windings to cool to the same temperature as the ground test connection
Last Answer : Answer: C
Description : What method of zeroing a synchro is perhaps the fastest but NOT necessarily the most accurate?
Last Answer : . The electrical lock method.
Description : Which of the eight methods for encoding digital data onto magnetic tape is most widely used because it’s accurate, simple, and reliable?
Last Answer : Non-return-to-zero (NRZ) encoding.
Description : What is the most accurate method of determining the condition of an electron tube?
Last Answer : Testing the tube in its circuit
Description : When taking resistance readings with a VOM, you will obtain the most accurate readings at or near what part of the scale?
Description : What is the common name used for an accurate snap acting switch?
Last Answer : A microswitch.
Description : When you are testing an inductor with a Hay bridge, the characteristics of the inductor are compared with what type of device?
Last Answer : A standard capacitor
Description : In a heterodyne-type frequency meter, what is the difference between the oscillator frequency and the unknown frequency?
Last Answer : Beat frequency.
Description : What type of frequency meter is shown and what is the value indicated for each meter in figure 1-52?
Last Answer : A) Vibrating-reed, 60Hz. (B) Moving-disk, 58 Hz.
Description : What type of meter is shown and what is the value of the quantity being measured for each meter in figure 1-51?
Last Answer : (A) Megger (megohmmeter), infinity; (B) Wattmeter, 9.5 kilowatts (9,500 watts). (C) Watt-hour meter, 2.693 megawatt-hours 2,693 kilowatt-hours) (2,693,000 watt-hours).
Description : What type of meter is shown and what is the value of the quantity being measured for each meter in figure1-49?
Last Answer : a. A dc ammeter, 90 mA dc b. A dc voltmeter, 200 V dc c. An ac voltmeter, 4.6 V ac d. An ohmmeter, 400 ohms
Description : What type of meter movement reacts to voltage rather than current?
Last Answer : Electrostatic.
Description : What type of meter movement is the d’Arsonval meter movement?
Last Answer : A permanent-magnet moving-coil meter movement used in most electrical and electronic meters.
Description : If a switch must be checked with power applied, what type of meter is used?
Last Answer : A voltmeter.
Description : What is the primary advantage of the electrodynamometer type meter over the D’Arsonval-type meter?
Last Answer : The electrodynamometer-type meter can be used to measure both ac and dc currents.
Description : What components in an electrodynamometer-type meter movement produce the magnetic field?
Last Answer : Fixed coils.
Description : The resistance in the two arms of the meter bridge are `5 Omega` and `R Omega`, respectively. When the resistance `R` is shunted with an equal resista
Last Answer : The resistance in the two arms of the meter bridge are `5 Omega` and `R Omega`, respectively. When the ... 15 Omega` C. `20 Omega` D. `25 Omega`
Description : A resistance R is to be measured using a meter bridge. Student chooses the standared resistance S to be `100 Omega`. He finds the null point at `l_(1)
Last Answer : A resistance R is to be measured using a meter bridge. Student chooses the standared resistance ... a more accurate measurement with a meter bridge
Description : Two resistances are connected in the two gaps of a meter bridge. The balance point is `20 cm` from the zero end. When a resistance `15 Omega` is conne
Last Answer : Two resistances are connected in the two gaps of a meter bridge. The balance point is `20 cm` from the zero end. ... the value. A. 3 B. 6 C. 9 D. 12
Description : The illustrated circuit is a wheatstone bridge. If the meter 'G' reads 0 with the switch closed then ________. EL-0024 A. the current through R1 - R2 is equal to the current through R3 - Rx B. the voltage ... of E C. the resistance of Rx is equal to the resistance of R2 D. all the above are true
Last Answer : Answer: A
Description : A faulty 'function generator' shown in the illustration may prevent _____________. EL-0095 A. proper pitch control from both the 'bridge' and 'engine room thrust levers' B. the 'split potentiometer ... control pitch C. the pitch meter from indicating accurately D. relays #2 and/or #3 from energizing
Description : The meter indicating the position of the 'bridge Thrust lever' shown in the illustration is located ___________________. EL-0095 A. in the Engine Control Room B. on the Bridge C. in the Captain's office D. in the Chief Engineer's office
Description : The illustrated circuit is a _____________. EL-0024 A. megohm meter B. Gauss meter C. wheatstone bridge D. germanium diode tester
Description : A temperature instrumentation system for an engine room console consists of a resistance temperature detector (RTD), a measuring bridge circuit, and a meter (or alarm circuit).Which of the following ... is zero. D. The input voltage of the resistance bridge is the constant temperature signal.
Description : Why will a meter indicate more voltage at the battery terminal when the battery is out of a circuit than when the battery is in a circuit?
Last Answer : The internal (source) resistance of the battery will drop some of the voltage
Description : When an unknown capacitance is tested with a bridge, what is the value of Cx if R1 equals 70 ohms, R2 equals 150 ohms, and Cs equals 550 microfarads?
Last Answer : 256 microfarads.
Description : When a bridge is used to measure resistance, what is the value of Rx if R1 equals 80 ohms, R2 equals 120 ohms, and R3 equals 280 ohms?
Last Answer : 420 ohms.
Description : What main advantage does a bridge rectifier have over a conventional full-wave rectifier?
Last Answer : The bridge rectifier can produce twice the voltage with the same size transformer.
Description : How does the supply voltage affect the accuracy of Wheatstone bridge measurements?
Last Answer : As the supply voltage increases, bridge components may heat up and become less accurate.
Description : When you are measuring a component using a bridge, what is the most common cause of inaccurate measurements?
Last Answer : The capacitive and inductive characteristics of the test leads.
Description : What conditions must be met in order to balance a bridge circuit?
Last Answer : A bridge circuit is balanced when the opposite legs of the comparing and measuring circuits exhibit the same voltage drop.
Last Answer : The bridge rectifier can produce double the voltage with the same size transformer.
Description : A Hay bridge measures inductance by comparing an inductor to what component?
Last Answer : A capacitor.
Description : What happens when a frequency meter is adjusted to the frequency of the signal being measured?
Last Answer : Power is absorbed by the frequency meter cavity; and a pronounced dip in power, at the output, will be observed.
Description : What is the main difference between a vu and a dB meter?
Last Answer : DB meters are used for measuring sine waves. Vu meters are used to measure the average value of complex waveforms.