Description : An ohmmeter used to test for front-to-back resistance of a PN junction diode should produce roughly what ratio? A. 100:01:00 B. 500:01:00 C. 1000:01:00 D. 5000:01:00
Last Answer : Answer: A
Description : What is the primary advantage of bulk-effect devices over normal pn-junction semiconductors?
Last Answer : Larger microwave power outputs.
Description : Which of the devices listed is indicated by the electronic symbol lettered as 'A', shown in the illustration? EL-0016 A. Thyristor B. Diode C. Capacitor D. Transistor
Last Answer : Answer: B
Description : Which of the listed devices may be used as a digital device? A. variable resistor B. diode C. strain gauge D. thermistor
Description : Write some applications of PN junction diode
Last Answer : 1. Rectifier circuit ii. clipping and clamping iii voltage multiplier iv AM detection v. Feedback diodes vi Freewheeling diode
Description : What type of PN diode is formed by using a fine metal wire and a section of N-type semiconductor material?
Last Answer : Point-contact.
Description : What is the purpose of a PN junction diode?
Last Answer : To convert alternating current into direct current
Description : A pn-junction diode emits light by spontaneous emission ∙ A. LED ∙ B. APD ∙ C. PIN
Last Answer : A. LED
Description : State any Four applications of PN junction diode.
Last Answer : 1. Rectifiers in power supplies, 2. Detectors in RF, 3 .Clippers, 4. In clamping networks used as DC Restorers, 5. As switches in digital logic circuits.
Description : Describe the working of PN junction diode with neat sketch under forward biased condition.
Last Answer : If the p-region (anode) is connected to the positive terminal of the external DC source and nside (cathode) is connected to the negative terminal of the DC source then the biasing ... The large number of majority carriers crossing the junction constitutes a current called as the forward current.
Description : Plot and explain I -V characteristics of a PN junction diode.
Last Answer : V-I characteristics of PN junction diode: Explanation: Forward Bias: If the external voltage applied on the silicon diode is less than 0.7 volts, the silicon diode ... reverse breakdown voltage. * Diode breakdown occurs by two mechanisms: Avalanche breakdown and Zener breakdown.
Description : Which of the listed pairs of materials make the best insulators? A. dry air and a vacuum B. tin and lead C. doped silicon and germanium D. paper and oil
Last Answer : Answer: D
Description : Which of the listed pairs of materials make the best insulators? A. copper and aluminum B. glass and mica C. dry air and a vacuum D. doped silicon and germanium
Description : Roxithromycin has the following advantage(s) over erythromycin: A. It is more effective in whooping cough B. It causes less gastric irritation C. It has longer plasma half-life D. Both 'B' and 'C' are correct
Last Answer : D. Both 'B' and 'C' are correct
Description : If a delicate component must be soldered into a circuit, the component may be protected from the heat of the soldering process by _____________. A. operating the soldering gun not more than 60 seconds at ... oxidizing the leads to be soldered D. coating the leads to be soldered with a light oil film
Description : An open coil in a transformer will be indicated by which of the listed conditions? A. 'zero' resistance accompanied by high inductance B. no resistance accompanied by stray inductance C. infinite resistance in addition to no inductance D. infinite resistance in addition to normal inductance
Last Answer : Answer: C
Description : If all three ground-detection lamps continue to burn at equal intensity after the test button is depressed and released, which of the listed conditions is indicated? A. No grounds exist B. All three phases are grounded C. The test switch is faulty D. The current transformers are shorted out
Description : On a switchboard, if all three ground detection lamps remain burning at half intensity when the test button is depressed, which of the listed conditions is indicated? A. No grounds exist. B. All three phases are grounded. C. The test switch is grounded. D. The current transformers are shorted.
Description : When a solid-state component of an electronic circuit is mounted to a metallic mass, the general purpose of that mass is to ____________. A. prevent vibration damage to delicate components B. prevent ... damage to solid-state components C. dissipate stray magnetic currents D. act as a heat sink
Description : Which of the following statements is true concerning the cleaning of electrical contacts? A. Compressed air should be used to blow out metallic dust. B. Magnetic brushes should be used to remove ... contact resistance. D. Delicate parts should be cleaned with a brush and an approved safety solvent.
Description : Which of the listed conditions occur when '4th point lower' is selected on the winch shown in the illustration? EL-0102 A. Master switch contacts '3', '4', '6', '8', '9', & '10' close. B. Contactors '2, 3, & 4M' and ' ... , '7', '8', and '9' close. D. Contactors '1 & 3M' and '1, 2, & 3A' pick up.
Description : Which of the listed conditions occur when selection is made for 'third point hoist' on the winch shown in the illustration? EL-0102 A. Master switch contacts '5', '6', '7', '8', and '9' close. B. Contactors '2M', ' ... ' and '2A' drop out. D. Master switch contacts '3','4', '6', '8', and '9' close.
Description : Under which of the listed conditions can the engine room retake the throttle control from the bridge? A. Any time it is deemed necessary. B. Only with the master's permission. C. After a 10 minute delay to the input command. D. Only after the throttle has been placed in stop.
Description : Which of the listed conditions might contribute to very rapid wearing of a DC machine's commutator bars? A. A grounded commutator bar B. Using improper carbon brushes C. Aligning the front and rear mica V-rings improperly D. An open circuit in the armature
Description : If a D.C. motor hums, but does not run when energized, which of the listed conditions could exist? A. Incorrect lead connections B. Incorrect brush setting C. A dirty commutator D. All of the above are correct.
Description : Which of the listed conditions could cause a DC motor to have excessively hot windings and sparking at the brushes? A. Reversed interpole polarity B. High bar-to-bar voltage C. Loose brushes D. Excessive humidity
Description : Which of the listed conditions will occur if dirt and grease are allowed to accumulate between the commutator segments of a motor? A. A partial short circuit. B. A dead short circuit. C. Misalignment of the motor shaft. D. Overspeeding of the motor.
Description : Which of the listed conditions will occur if the polarity of the field poles and the direction of current to the brushes of a DC motor were both reversed? A. The motor would not start. ... direction of rotation of the armature would be unchanged. D. The field pole windings would become overheated.
Description : Which of the conditions listed will indicate the need to clean the insulation on the windings of an electric motor? A. Higher than normal operating temperature. B. Excessive vibration at normal speed. C. Sparking at the brushes. D. High megger readings.
Description : Which of the listed conditions could indicate the need for cleaning electrical insulation? A. Low ambient temperature B. Low operating temperature C. High dielectric strength D. Low megger readings
Description : Which of the listed sections of an emergency switchboard is used to supply power for alarm signals under emergency conditions? A. The generator and bus transfer section B. The 450 volt, 60 cycle, 3 phase bus C. The 120 volt, 3 phase, 60 cycle bus D. The 24 volt DC bus
Description : An increase in which of the listed conditions will increase the speed of a synchronous motor? A. Frequency B. Voltage C. Armature current D. Inductance
Description : Which of the listed conditions describes the effect on intrinsic semiconductor operation as a result of a temperature increase? A. Additional heat sinks will be required B. Conductivity will increase C. Conductivity will decrease D. Resistivity will increase
Description : In a logic circuit the NOR and NAND gate functions ____________. A. must be accomplished with a common base transistor arrangement B. are available in diode form C. are exact opposites with the ... . have output conditions that are exact opposites to the output condition for OR and AND, respectively
Description : One advantage of non-price competition is that: A)a firm can react quickly to competitive efforts. B)market share becomes less important. C)a firm can build customer loyalty. D)pricing is no longer a success factor.
Last Answer : C)a firm can build customer loyalty.
Description : Which of the terms listed best describes a compound-wound DC generator having a higher voltage at no load than at full load? A. Flat compounded B. Over compounded C. Under compounded D. Terminal compounded
Description : The growth of vacuum tube technology has been listed as follow: a. 1946-1957 b. 1958-1964 c. 1985-1999 d. None of these
Last Answer : a. 1946-1957
Description : Which breakdown theory explains the action that takes place in a heavily doped PN-junction with a reverse bias of less than 5 volts?
Last Answer : Zener effect.
Description : An advantage of DC motors over AC motors is that they _____________. A. are less expensive B. require less maintenance C. offer infinite speed variation D. all of the above
Description : An advantage of DC motors over AC motors is that they _____________. A. are less expensive B. require less maintenance C. can be started across the line D. offer a more effective means of controlling speed
Description : What is a vacuum diode ? What is a vacuum diode ?
Last Answer : A vacuum tube with two electrodes is called a vacuum diode.
Description : I need a delicate way to tell my boss that I feel like I am not being trained and kept up to date.
Last Answer : I should have added this: How do I ask to be kept better informed without looking or sounding like I am complaining, even though I am?
Description : Fluconazole offers the following advantage(s) over ketoconazole: A. It is longer acting B. Its absorption from stomach is not dependent on gastric acidity C. It produces fewer side effects D. All of the above
Last Answer : D. All of the above
Description : The main advantage of sunk key is that it is a _____ drive. a) Positive b) Negative c) Neutral d) None of the listed
Last Answer : a) Positive
Description : The Diamond Model assumes that: a) Multinational firms must develop global strategies based only on home demand conditions. b) Multinational firms must pay less attention to global consumers than domestic ... a firm plays a key role in shaping that firm's competitive advantage in global markets.
Last Answer : The national home base of a firm plays a key role in shaping that firm's competitive advantage in global markets.
Description : What kinds of precautions do you take when you handle very delicate objects?
Last Answer : I am mindful to not hold over a hard surface, like a tile floor or a hard table. And I use both hands if necessary. I have a few delicate blown glass Christmas ornaments. The kids and I always pick them up by their hooks, and are gentle when putting them on or taking them off.
Description : Sorry if this is not a delicate question...but why does my cat smell like sour milk?
Last Answer : Many cats are lactose-intolerant, so yes, even a small amount could have an effect. If he smells like sour milk, though, I would think maybe he got some on himself. If he’s acting fine I wouldn’t worry.
Description : How would you handle this somewhat delicate situation (see details)?
Last Answer : answer:How does your younger daughter feel about this girl? I remember being forced to entertain the older sister of my sister's friend so many times. I couldn't stand that girl. Finally I had to ... the younger that its rude to invite yourself to someone's house, they deserve a smack of reality.
Description : She's as delicate as a ___?
Last Answer : A pair of knuckle dusters.