Description : What type of device is used to extend the current measuring capability of electrodynamic wattmeters?
Last Answer : Current transformers.
Description : The power delivered to a 3-phase load can be measured by the use of two wattmeters only when the (a) load is unbalanced (b) load is balanced (c) three phase load is connected to the source through three wires (d) three phase load is connected to the source through four wires
Last Answer : The power delivered to a 3-phase load can be measured by the use of two wattmeters only when the three phase load is connected to the source through three wires
Description : Two wattmeters are used to measure the power in a 3 -phase balanced system. What is the power factor of the load when one wattmeter reads twice the other ? (a) 0 (b) 0.5 (c) 0.866 (d) 1
Last Answer : Two wattmeters are used to measure the power in a 3 -phase balanced system. What is the power factor of the load when one wattmeter reads twice the other ? 0.866
Description : Two wattmeters connected to measure the power input to a balanced three-phase circuit indicate 4.5 KW and 3 KW respectively. Find the power factor of the circuit. A. 0.7 B. 0.8 C. 0.95 D. 0
Last Answer : Two wattmeters connected to measure the power input to a balanced three-phase circuit indicate 4.5 KW and 3 KW respectively. Find the power factor of the circuit. 0.95
Description : The power in a 3phase circuit is measured with the help of 2 wattmeters. The reading of one of wattmeters is positive and that of the others is negative. The magnitude of readings is different. It can be concluded that the ... (A) Unity (B) 2 (lagging) (C) 5 (lagging) (D) Less than 0.5 (lagging)
Last Answer : A
Description : In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was?
Last Answer : In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was unity.
Description : What is the main advantage of using a time-domain reflectometer (tdr) to test a transmission line?
Last Answer : Tdr will indicate the nature of and the distance to or location of any faults.
Last Answer : For handling greater currents induction wattmeters are used in conjunction with current transformers.
Description : What is the primary advantage of power-amplifier transmitters over keyed-oscillator transmitters?
Last Answer : Frequency stability.
Description : For power measurements, what advantage does an electronic wattmeter have over an electrodynamic wattmeter?
Last Answer : Electronic wattmeters are capable of measuring high-fequency signals.
Description : What meters operate from their own power sources?
Last Answer : Self-excited.
Description : Why is a multimeter preferred over separate meters?
Last Answer : It is much more convenient to have one meter with several functions than several meters each with a single function.
Description : What is the chief advantage of the air coaxial line?
Last Answer : The ability to minimize radiation losses.
Description : What is an advantage of using a resistance soldering iron when soldering wire to a connector?
Last Answer : The soldering tips are hot only during the brief period of soldering the connection, thus minimizing the chance of burning the wire insulation or connector inserts.
Description : What is the advantage of using a closed-servo loop to control load velocity?
Last Answer : The closed-servo loop can regulate load speed under changing conditions.
Description : What is the advantage of using a battery test set versus a voltmeter to test batteries?
Last Answer : A battery test set will test batteries under load conditions.
Description : What advantage is gained by using pole pieces with curved faces in the D’Arsonval meter movement?
Last Answer : Two-position and three-position.
Description : What is the primary advantage of using a current probe?
Last Answer : Current probes enable you to perform current measurements without disconnecting wires. Current probes are clamped around the insulated wire.
Description : What is an advantage of using horizontal polarization at high frequencies?
Last Answer : Less interference is experienced by man-made noise sources
Description : What is a major advantage of the crimped terminal over the soldered terminal?
Last Answer : Requires relatively little operator skill to install.
Description : What advantage does a half adder have over a quarter adder?
Last Answer : The half adder generates a carry.
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.
Last Answer : The bridge rectifier can produce double the voltage with the same size transformer.
Description : What is the great advantage of computers over typewriters?
Last Answer : Correcting errors.
Description : What is the primary advantage of bulk-effect devices over normal pn-junction semiconductors?
Last Answer : Larger microwave power outputs.
Description : What is the advantage of single-sideband (ssb) transmission over AM transmission?
Last Answer : The same amount of intelligence can be transmitted with one sixth of the output power with less than one-half the bandwidth.
Description : Why is direct accessing of data a big advantage over the sequential accessing of data?
Last Answer : It gives us fast, immediate access to specific data without having to examine each and every record from the beginning.
Description : What advantage does a shunt motor have over a series motor?
Last Answer : It maintains a constant speed under varying loads.
Description : What is the major advantage of a transistor over a tube?
Last Answer : Rugged design.
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, if any, noise susceptibility advantage exists for pulse-amplitude modulation over analog amplitude modulation?
Last Answer : Both are susceptible to noise and interference
Description : What characteristic is determined by the time required for a voltage wave to travel from the input end of an artificial transmission line to the output end and back again?
Last Answer : Pulse width
Last Answer : Pulse width.
Description : A station is known to operate at 60-meters. What is the frequency of the unknown station?
Last Answer : 5 megahertz.
Description : In reference to dB meters, 0 dBm represents 1 milliwatt into what value of load?
Last Answer : 600-ohm load.
Description : What do impedance-angle meters and vector bridges have in common?
Last Answer : Both measure phase angle and magnitude in determining impedance.
Description : What are two types of frequency meters?
Last Answer : Vibrating reed and moving disk.
Description : Why is in-circuit meters used?
Last Answer : In-circuit meters are used to monitor the operation of electrical or electronic devices.
Description : What two types of meters can be used to check a switch?
Last Answer : An ohmmeter and a voltmeter.
Description : Using table 1-1, name two synchros that provide a mechanical output.
Last Answer : The torque receiver (TR) and the torque differential receiver (TDR).
Description : Why does using ac vice dc bias voltage result in a stronger output signal?
Last Answer : Because an ac bias voltage of the proper frequency and level places the input signal away from both steps in the magnetism curve. The result is two undistorted output signals that are combined into one strong output.
Description : The advantage of using the illustrated circuit configuration is _________. EL-0045 A. high input resistance B. high current gain C. the best stability with an increase in temperature D. the input and output are 180 degrees out of phase
Last Answer : Answer: C
Description : In the power amplifier shown in figure 2-10, what two signals are mixed to produce the output signal?
Last Answer : Local oscillator and coherent oscillator.
Description : When a transmitter uses a high-power oscillator to produce the output pulse, what switches the oscillator on and off?
Last Answer : High-voltage pulse from the modulator.
Description : Which type of optical splitter (Y-coupler or T-coupler) splits only a small amount of power from the input fiber to one of the output fibers?
Last Answer : T-coupler
Description : Debunching of the electron bunches in the higher modes of a reflex klystron has what effect on output power?
Last Answer : Power is reduced.
Description : What can be added to the basic two-cavity klystron to increase the amount of velocity modulation and the power output?
Last Answer : Intermediate cavities between the input and output cavities.