Description : What effect does flux leakage in a transformer have on the coefficient of coupling (K) in the transformer?
Last Answer : it causes K to be less than unity (I).
Description : If 8 bolts are emplaced in a clamp coupling with shaft diameter 80mm d, calculate the diameter of each bolt if coefficient of friction is 0.3 and torque transmitted is 4000N-m. Permissible tensile stress is 80N/mm2. a) 27mm b) 25mm c) 23mm d) 21mm
Last Answer : a) 27mm
Description : If 8 bolts are emplaced in a clamp coupling with shaft diameter 80mm d, calculate the tensile force on each bolt if coefficient of friction is 0.3 and torque transmitted is 4000N-m. a) 51234.4N b) 45968.3N c) 41666.7N d) None of the listed
Last Answer : c) 41666.7N
Description : What is coefficient of coupling? Explain in brief.
Last Answer : Coefficient of coupling (k): It is defined as the ratio of actual mutual inductance present between two coils to the maximum possible value. If L1 and L2 are coefficients of self ... K is less than one. The coefficient of coupling is also called as Magnetic coupling Coefficient.
Description : The coefficient of coupling between two air core coils depends on (A) mutual inductance between two coils only (B) self inductances of the two coils only (C) mutual inductance and self inductances of the two coils (D) none
Last Answer : The coefficient of coupling between two air core coils depends on mutual inductance and self inductances of the two coils
Description : The coefficient of coupling between two coils is 0.45. The first coil has an inductance of 75 mH and the second coil has an inductance of 105 mH. What is the mutual inductance between the coils? (1) 3.54 mH (2) 7.88 mH (3) 39.9 mH (4) 189.3 mH
Last Answer : The coefficient of coupling between two coils is 0.45. The first coil has an inductance of 75 mH and the second coil has an inductance of 105 mH. 39.9 mH is the mutual inductance between the coils.
Description : Loose or inefficient coupling of energy into or out of a waveguide can be accomplished by the use of what method?
Last Answer : Slots and apertures.
Description : What are two advantages of this type of coupling?
Last Answer : It uses fewer components than capacitive coupling and can provide an increase in gain.
Description : What is the most common form of coupling for an rf amplifier?
Last Answer : Transformer coupling.
Description : If current gain is required from an rf amplifier, what type of component should be used as an output coupling element?
Last Answer : A step-down transformer.
Description : Is coupling loss from angular misalignment more critical in expanded beam or butt-jointed connectors?
Last Answer : Expanded beam connectors.
Description : Is coupling loss from fiber separation and lateral misalignment more critical in expanded-beam or butt-jointed connectors?
Last Answer : Butt-jointed connectors.
Description : What are the two methods used for feedback coupling?
Last Answer : Inductive and capacitive.
Description : Does coupling loss from refractive index profile difference result when the receiving fiber has a larger profile parameter
Last Answer : Fiber alignment.
Description : What is the basic fiber cleaving technique for preparing optical fibers for coupling?
Last Answer : Score-and-break.
Description : How does index matching gel affect the amount of coupling loss caused by (a) fiber separation, (b) lateral misalignment, and (c) angular misalignment?
Last Answer : (a) Reduces coupling loss, (b) does not change coupling loss, and (c) increases coupling loss
Description : What connection properties result in fiber optic connector coupling loss?
Last Answer : Poor fiber alignment and end preparation, fiber mismatches, and Fresnel reflection.
Description : In fiber-to-fiber connections, Fresnel reflection is one source of coupling losses. Light is reflected back into the source fiber and is lost. What causes Fresnel reflection?
Last Answer : A step change in refractive index that occurs at fiber joints, caused by fiber separation.
Description : Fiber-to-fiber coupling loss is affected by intrinsic and extrinsic coupling losses. Can intrinsic coupling losses be limited by limiting fiber mismatches?
Last Answer : Yes.
Description : What are the main causes of coupling loss?
Last Answer : Poor fiber end preparation and poor fiber alignment.
Description : How are source-to-fiber coupling and microbending and macrobending losses affected by changes in core diameter and D?
Last Answer : Coupling efficiency increases with both core diameter and D, while bending losses increase directly with core diameter and inversely with D.
Description : In a circuit using grid-leak biasing, the coupling capacitor (Cc) chargcharge path?
Last Answer : rkg, the cathode to grid resistance.
Description : Will fiber coupling loss generally increase or decrease if the mode field diameter of a single mode fiber is decreased?
Last Answer : Increase.
Description : As the core and cladding modes travel along the fiber, mode coupling occurs. What is mode coupling?
Last Answer : Mode coupling is the exchange of power between two modes.
Description : What type of coupling is most effective at high frequencies?
Last Answer : Impedance coupling.
Description : What type coupling would be most useful for an audio amplifier between the first and second stages?
Last Answer : RC coupling.
Description : What type coupling is usually used to couple the output from a power amplifier?
Description : . What is the most common form of coupling?
Description : What are four methods of coupling amplifier stages?
Last Answer : Direct, RC, impedance, and transformer coupling.
Description : What is the purpose of an amplifier-coupling network?
Last Answer : To transfer energy (a signal) from one stage to another.
Description : Define the term negative temperature coefficient.
Last Answer : It is the decrease in a semiconductor’s resistance as temperature rises.
Description : Which temperature coefficient indicates a material whose resistance increases as temperature increases?
Last Answer : Positive.
Description : Will an optical fiber's attenuation coefficient vary with changes in wavelength?
Description : Define the temperature coefficient of resistance.
Last Answer : The amount of increase in the resistance of a 1-ohm sample of the conductor per degree of temperature rise above 0º C
Description : What type of temperature coefficient material does not produce increased heat in response to increased current flow?
Last Answer : Zero-temperature coefficient.
Description : What is meant by critical damping coefficient? * 1 point (A) Frequency of damped free vibrations is less than zero (B). The motion is a periodic in nature (C). Both a. and b. (D). None of the above
Last Answer : (C). Both a. and b.
Description : What is meant by critical damping coefficient? A Frequency of damped free vibrations is less than zero B The motion is aperiodic in nature C Both a. and b. D None of the above
Last Answer : B The motion is aperiodic in nature
Description : What is meant by critical damping coefficient? B ( A )Frequency of damped free vibrations is less than zero ( B )The motion is aperiodic in nature ( C )Both a. and b. (D)None of the above
Last Answer : ( B )The motion is aperiodic in nature
Description : What is meant by critical damping coefficient? a. Frequency of damped free vibrations is less than zero b. The motion is aperiodic in nature c. Both a. and b. d. None of the above
Last Answer : b. The motion is aperiodic in nature
Description : What is meant by "exciting current" in a transformer?
Last Answer : Exciting current is the current that flows in the primary of a transformer with the secondary open (no load attached).
Description : What is meant is "transformer action"?
Last Answer : The transfer of energy from one circuit to another circuit by electromagnetic induction.
Description : What is meant by diode ratings?
Last Answer : They are the limiting values of operating conditions outside which operations could cause diode damage.
Description : What is meant by the term "multipath"?
Last Answer : A term used to describe the multiple patterns a radio wave may follow.
Description : When referring to spectrum analyzers, what is meant by the term resolving signals?
Last Answer : The ability of the analyzer to discriminate between display signals of slightly different frequencies.
Description : What is meant by frequency deviation?
Last Answer : The difference between the carrier frequency of an fm signal and its maximum frequency excursion when modulated.
Description : What is meant by induced emf? By counter emf?
Last Answer : Induced emf is the emf which appears across a conductor when there is relative motion between the conductor and a magnetic field; counter emf is the emf induced in a conductor that opposes the applied voltage.
Description : With regard to computer logic circuits, what is meant by "complement?"
Last Answer : The opposite of the original statement.
Description : We’re watching the Wizard of Oz, and I’m wondering if there’s any truth to the story about the difficulty they had filming the movie due to the fact that the little actors playing the munchkins were so busy coupling up?
Last Answer : The last munchkin to die seemed to have said that sadly Garland’s personal problems which included drinking led to making unfortunate statements which were untrue.
Description : A locomotive of weight 100 tonnes is attached to train of wagons weighing 1000 tonnes. The locomotive pulls the wagons with a constant velocity of 36 km/hour. When the coupling between the train and wagons breaks, the wagons roll on 95 m in ... would be a.0.36 m b.0.44 m c.0.77 m. d.0.5 m e.0.66 m
Last Answer : d. 0.5 m