Description : State three factors that affect the capacitance of a capacitor.
Last Answer : a. The area of the plates. b. The distance between the plates. c. The dielectric constant of the material between the plates.
Description : . What are two of the three physical factors that determine the values of capacitance and inductance of a transmission line?
Last Answer : (1) Type of line used, (2) dielectric in the line, and (3) length of line.
Description : If a three farad capacitor and a six farad capacitor are connected in parallel, what is their equivalent capacitance?
Last Answer : ANSWER: 9 FARADS
Description : Three capacitors with different capacitances are connected in series. Which of the following statements is TRUE? w) All three of the capacitors have the same potential difference between their plates. x ... y) The capacitance of the system depends on the voltage applied across the three capacitors.
Last Answer : ANSWER: X -- THE MAGNITUDE OF THE CHARGE IS THE SAME ON ALL OF THE CAPACITOR PLATES
Description : A capacitor of capacitance `C` carrying charge `Q` is connected to a source of emf `E`. Finally, the charge on capacitor would be
Last Answer : A capacitor of capacitance `C` carrying charge `Q` is connected to a source of emf `E`. Finally, the charge on ... . Q B. Q + CE C. C E D. none
Description : The value of the capacitance depends upon the________________? A.voltage applied B. thickness of the capacitor plates C. geometry of the capacitor D. dinsity of the capacitor plates
Last Answer : Ans: C
Description : In the illustrated circuit, one advantage of the capacitor coupling over direct coupling is ____________. EL-0048 A. as the frequency decreased the capacitive reactance (Xc) increases B. the amplifier becomes ... of the signal while it isolates the biasing of each stage. D. good frequency response.
Last Answer : Answer: C
Description : Capacitance in an AC circuit will _____________. A. stop current flow once the capacitor is fully charged B. allow current flow in only one direction C. oppose any change in circuit voltage D. rectify the current
Description : Total capacitance of 300 mF capacitor and a 600 mF in series isA. 300 mF B. 500 mF C. 200 mF D. 1000 mF
Last Answer : 200 mF
Description : If charge stored on plates of capacitor is large, then capacitance will be A. small B. large C. zero D. infinite
Last Answer : large
Description : Find the time constant of a capacitor with capacitance of 2 microfarad having an internal resistance of 4 megaohm. a) 2 b) 0.5 c) 8 d) 0.25
Last Answer : c) 8
Description : Reduction in the capacitance of a capacitor-start motor, results in reduced (A) Noise. (B) Speed. (C) Starting torque. (D) Armature reaction.
Last Answer : Ans: C Reduction in the capacitance reduces starting voltage, which results in reduced starting torque.
Description : A two farad and a four farad capacitor are connected in parallel. What single capacitance is "equivalent" to this combination?
Last Answer : ANSWER: 6 FARADS
Description : The length of both sides of a square parallel plate capacitor are doubled. The capacitance is: w) halved x) the same y) doubled z) quadrupled
Last Answer : ANSWER: Z -- QUADRUPLED
Description : A 10 volt battery connected to a capacitor delivers a charge of 0.5 coulombs. The capacitance of the capacitor is: w) 2 x 10-2 farads x) 5 x 10-2 farads y) 2 farads z) 5 farads
Last Answer : ANSWER: X -- 5 x 10-2 FARADS
Description : For a parallel-plate capacitor with plate area "A" and plate separation "d", the capacitance is proportional to which of the following? w) A divided by d squared x) A times d y) A divided by d z) d divided by A
Last Answer : ANSWER: Y -- A DIVIDED BY D
Description : A two farad and a four farad capacitor are connected in series. What single capacitance is "equivalent" to this combination?
Last Answer : ANSWER: 4/3 FARADS
Description : If a capacitance is charged by a square wave current source, then the voltage across the capacitor will be (a) Square wave (b) Step function (c) Triangular wave (d) Zero
Last Answer : If a capacitor is charged by a square wave current source, the voltage across the capacitor is : triangular wave
Description : The capacitance of the capacitor is directly proportional to the
Last Answer : The capacitance of the capacitor is directly proportional to the Area of the plate
Description : A capacitor of capacitance 50 micro farads is charged to a potential difference of 200 Volts. Find out energy stored in the condenser?
Last Answer : A capacitor of capacitance 50 micro farads is charged to a potential difference of 200 Volts. Find out energy stored in the condenser? 1 joule
Description : What happens to the capacitance if mica is inserted between the plates of an air capacitor? A) The capacitance increases B) The capacitance decreases C) The capacitance remains the same D) The capacitance becomes zero
Last Answer : What happens to the capacitance if mica is inserted between the plates of an air capacitor? A) The capacitance increases B) The capacitance decreases C) The capacitance remains the same D) The capacitance becomes zero
Description : What is the capacitance when a capacitor passes a current of 31.43 mA when supplied with 40 V AC with a frequency of 1000 Hz? A) 0.125 F B) 0.125 μF C) 1257.2 μF D) None of these
Last Answer : What is the capacitance when a capacitor passes a current of 31.43 mA when supplied with 40 V AC with a frequency of 1000 Hz? A) 0.125 F B) 0.125 μF C) 1257.2 μF D) None of these
Description : Which of the following can be used to measure the capacitance of a capacitor? A) Rheostat B) Schering bridge C) Wheatstone bridge D) None of these
Last Answer : Which of the following can be used to measure the capacitance of a capacitor? A) Rheostat B) Schering bridge C) Wheatstone bridge D) None of these
Description : With the help of which bridge are the capacitance and dielectric loss of a capacitor generally measured ?
Last Answer : With the help of Schering bridge are the capacitance and dielectric loss of a capacitor generally measured.
Description : Reduction in the value of capacitance of a capacitor -start motor, results in reduced: (A) noise (B) speed (C) starting torque (D) armature reaction
Last Answer : A
Description : Examine the three capacitors shown below. What is the capacitance of each?
Last Answer : a. 26µF or 260,00pF b. 630pF c. 9600pF
Description : What type of feedback is usually caused by the base-to collector interelectrode capacitance?
Last Answer : Degenerative or negative
Description : What type of feedback is usually caused by interelectrode capacitance?
Last Answer : Negative (degenerative) feedback
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 : What effect does an increase in capacitance have on a capacitor’s opposition to current flow?
Last Answer : Opposition to current flow decreases.
Description : When the reverse bias on a varactor is increased, what happens to the effective capacitance?
Last Answer : Capacitance decreases.
Description : A transmission line is said to have distributed constants of inductance, capacitance, and resistance along the line. What units of measurement are used to express these constants?
Last Answer : Inductance is expressed in micro henrys per unit length, capacitance is expressed in picofarads per unit length, and resistance is expressed in ohms per unit length.
Description : Trade-offs between competing effects are necessary for high speed response. Which competing effect (fast transit time, low capacitance, or high quantum efficiency) requires a thin active area?
Last Answer : Fast transit time.
Description : Should the capacitance of the photodetector be kept small or large to prevent the RC time constant from limiting the response time?
Last Answer : Small
Description : Moving tube electrodes apart to decrease interelectrode capacitance causes an increase in the effect of what property?
Last Answer : Transit time
Description : What happens to the impedance of interelectrode capacitance as frequency increases?
Last Answer : Impedance decreases.
Description : How does the addition of a screen grid in a tetrode reduce interelectrode capacitance?
Last Answer : The interelectrode capacitance (cpg) is divided between two series capacitances; thus, cpg is greatly reduced.
Description : What happens to the value of XC as capacitance increases
Last Answer : XC decreases.
Description : state what happens to the electrons in a capacitor circuit when (a) the capacitor is charging and (b) the capacitor is discharging.
Last Answer : a. When the capacitor is charging, electrons accumulate on the negative plate and leave the positive plate until the charge on the capacitor is equal to the battery voltage. b. When the ... the negatively charged plate to the positively charged plate until the charge on each plate is neutral.
Description : What is the relative length of the time constant for the diode capacitor combination in a damper (long or short)?
Last Answer : Short time constant.
Description : How does a capacitor and an inductor react to (a) low frequency and (b) high frequency?
Last Answer : At low-frequency, a capacitor acts as an open and an inductor acts as a short. At high-frequency, a capacitor acts as a short and an inductor acts as an open.
Description : What is the term for the number of times per second that tank circuit energy is either stored in the inductor or capacitor?
Last Answer : Natural frequency or resonant frequency (f r).
Description : When the capacitor is completely discharged, where is the energy of the tank circuit stored?
Last Answer : Inductor magnetic field
Description : If the inductor and capacitor values are increased, what happens to the resonant frequency?
Last Answer : Decreases.
Description : In an a.c. circuit that contains both an inductor and a capacitor, what term is used for the difference between the individual reactances?
Last Answer : Resultant reactance.
Description : What is the term used to refer to the losses which can be traced to the dielectric of a capacitor?
Last Answer : Power losses.
Description : What is the purpose of the synchro capacitor?
Last Answer : To improve overall synchro system accuracy by reducing stator currents.
Description : What are the two main disadvantages of an LC capacitor filter?
Last Answer : Cost and size of the inductor.
Description : What determines the rate of discharge of the capacitor in a filter circuit?
Last Answer : Value of capacitance and load resistance.
Description : In a capacitor filter, is the capacitor in series or in parallel with the load?
Last Answer : Parallel.