Description : An AC circuit has capacitance arranged in series. If the line voltage remains constant, the capacitive reactance value can be varied by changing the _____________. A. line frequency B. resistance C. number of commutating poles D. number of interpoles
Last Answer : Answer: A
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 : What is the value of the capacitor in the astern valve position circuit shown in the illustration? EL-0099 A. 100 kFarad B. 0.5 microfarad C. 0.5 millifarad D. 50 kFarad
Last Answer : Answer: B
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 : What is the RC time constant of a series RC circuit that contains a 12-megohm resistor and a 12-microfarad capacitor?
Last Answer : 144 seconds (t=R x C)
Description : The combined effect of inductive reactance, capacitive reactance, and resistance in an AC series circuit is known as _____________. A. reactance B. total reactance C. impedance D. resonance
Description : AC circuits possess characteristics of resistance, inductance, and capacitance. The capacitive reactance of a circuit is expressed in _____________. A. ohms B. mhos C. henrys D. farads
Description : Find the time constant for a R-C circuit for resistance R = 24 kohm and C = 16 microfarad. a) 1.5 millisecond b) 0.6 nanosecond c) 384 millisecond d) 384 microsecond
Last Answer : c) 384 millisecond
Description : The frequency of a wave travelling at a speed of 500 ms-1 is 25 Hz. Its time period will be ______. (i) 20 s (ii) 0.05 s (iii) 25 s (iv) 0.04 s
Last Answer : (iv) 0.04 s
Description : What happens to current flow in a capacitive circuit when the DC voltage across the capacitor is approximately equal to the source voltage?
Last Answer : Capacitor always charges up to the voltage of source. When the capacitor is charged to same as source voltage then there is no current flowing through the capacitor. The current through the capacitor is called displacement current.
Description : What is the impedance of a one microfarad capacitor at 60 Hertz: w) 16,700 ohms x) 2,650 ohms y) 3.8x10-4 ohms z) 6x10-5 ohms
Last Answer : ANSWER: X -- 2,650 OHMS
Description : A series R-L-C Circuit has a resonant frequency of 1000 Hz. If the values of R, L and C are doubled, the new resonant frequency is
Last Answer : A series R-L-C Circuit has a resonant frequency of 1000 Hz. If the values of R, L and C are doubled, the new resonant frequency is 500 Hz
Description : The rotor frequency for a 3 phase 1000 RPM 6 pole induction motor with a slip of 0.04 is________Hz (A) 8 (B) 4 (C) 6 (D) 2
Last Answer : Ans: D Given: N=1000 rpm ; P= 6; s= 0.04; and f = NP/ 120 = 10006/120 = 50 Hz Rotor frequency fr=sf = 0.0450 = 2.0 Hz
Description : The rotor frequency for a 3-phase 6-pole, 1000 r.p.m. induction motor with a slip of 0.04 is (a) 2 Hz (b) 4 Hz (c) 6 Hz (d) 8 Hz
Last Answer : 2hz is rotor frequency
Description : An AC circuit has a capacitive reactance of 30 ohms in addition to an inductive reactance of 40 ohms connected in series. What is the reactance of the circuit? A. 8.37 ohms B. 10.00 ohms C. 50.00 ohms D. 70.00 ohms
Description : The reactance offered by a capacitor to an alternating current of frequency 50 Hz is 10 ohm. If frequency is increased to 100 Hz, the reactance will be (a) 2.5 ohm (b) 5.0 ohm (c) 20.0 ohm (d) 40.0 ohm
Last Answer : Xc = 1/(2*pi*f*c) so when f is double .... Xc will be half ... Ans is 5ohm
Description : The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 Q. If frequency is increased to 100 Hz, reactance becomes_____ohms.
Last Answer : The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 Q. If frequency is increased to 100 Hz, reactance becomes 10 ohms.
Description : A 10 Kg mass suspended by spring of stiffness 1000 N/m. the natural frequency of the system after giving excitation will be A. 0 Hz B. 1.59 Hz C. 2 Hz D. 15.9 Hz
Last Answer : B. 1.59 Hz
Description : Transmission lines when connected to antenna have A. capacitive load B. resistive load whose resistance is less than characteristics impedance C. resistive load at the resonant frequency D. resistive load whose resistance is greater than the characteristic impedance of the line
Last Answer : C. resistive load at the resonant frequency
Description : A coil is wound with 200 feet of No. 16 tinned copper wire and connected to a 12 volt battery. What is the current if the resistance per 1000 feet of No. 16 tinned copper wire is 4.26 ohms? A. 1.14 amps B. 7.04 amps C. 10.22 amps D. 14.08 amps
Last Answer : Answer: D
Description : Decreasing the frequency in a capacitive circuit while maintaining a constant circuit voltage, will result in a/an _____________. A. increase in apparent power B. decrease in circuit current C. decrease in capacitive reactance D. decrease in total impedance
Description : In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will?
Last Answer : In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will be reduced by half.
Description : The electrical diagram shown in the illustration is used to depict a/an ____________. EL-0015 A. resistance circuit B. inductive circuit C. stepdown circuit D. capacitive circuit
Description : Why 0.04 micro farad capacitor is used in a thermistor based fire alarm?
Last Answer : Need answer
Description : What is the reference frequency of CCIT phosphomeric noise measurement? A. 800 Hz B. 1000 Hz C. 1500 Hz D. 3400 Hz
Last Answer : A. 800 Hz
Description : A frequency of 3000 Hz has how many octaves above 1000 Hz? A. 1.6 octaves B. 2.1 octaves C. 1 octave D. 3 octaves
Last Answer : A. 1.6 octaves
Description : What is the reference frequency of CCITT psophometric noise measurement? A. 800 Hz B. 1500 Hz C. 3400 Hz D. 1000 Hz
Description : A car having a mass of 1000 kg deflects its springs 4 cm under its load. Determine the natural frequency of the car in vertical direction. A 5 Hz B 4.67 Hz C 9.8 Hz D 2.49 Hz
Last Answer : D 2.49 Hz
Description : A car having a mass of 1000 kg deflects its springs 4 cm under its load. Determine the natural frequency of the car in vertical direction. A 5 HzB 4.67 Hz C 9.8 Hz D 2.49 Hz
Description : A car having a mass of 1000 kg deflects its springs 4 cm under its load. D Determine the natural frequency of the car in vertical direction. (A)5 Hz (B) 4.67 Hz (C) 9.8 Hz (D) 2.49 Hz
Last Answer : (D) 2.49 Hz
Description : If the frequency spectrum of a signal has a bandwidth of500 Hz with thehighest frequency at 600 Hz, what shouldbe the samplingrate, according to the Nyquist theorem? A) 200 samples/s B) 500 samples/s C) 1000 samples/s D) 1200 samples/s
Last Answer : 1200 samples/s
Description : What causes high-frequency flutter (above 1000 Hz)?
Last Answer : Fixed parts of a tape transport, such as fixed tape guides and magnetic heads.
Description : What causes low-frequency flutter (below 1000 Hz)?
Last Answer : Rotating parts of a tape transport, such as irregular tape reels, sticking guides and pinch rollers, and capstans
Description : In a four stroke I.C engine completing 3000rpm the natural frequency of vibration of the exhaust valve should be a. 1200 Hz b. 1000 Hz c. 600 Hz d. 120 Hz
Last Answer : b. 1000 Hz
Description : The frequency of an AC generator is controlled by the _____________. A. rheostat B. governor C. exciter D. capacitor
Description : One of the following is a possible cause of an abrupt frequency variation in a self exited transmitter oscillator circuits resulting to a poor frequency stability to hold a constant frequency ... capacitor in the oscillator D. Loose connections in the oscillator, amplifier, or antenna circuits.
Last Answer : D. Loose connections in the oscillator, amplifier, or antenna circuits.
Description : An `L-C-R` series circuit with `100Omega` resistance is connected to an `AC` source of `200V` and angular frequency `300rad//s`. When only the capacit
Last Answer : An `L-C-R` series circuit with `100Omega` resistance is connected to an `AC` source of `200V` and ... and the power dissipated in the `L-C-R` circuit
Description : In an AC circuit, the inductive reactance of a coil varies with the _______________. A. resistance of the circuit B. frequency of the circuit C. voltage of the circuit D. current of the circuit
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 : What is the purpose of a capacitor in an AC circuit?
Last Answer : Every AC supply is not ideal AC it contains DC component so to provide restriction to DC component in supply we have to use Capacitor
Description : Calculate damping ratio from the following data: mass = 200Kg ω = 20rad/s damping coefficient = 1000 N/m/s a) 0.03 b) 0.04 c) 0.05 d) 0.06
Last Answer : b) 0.04
Description : Find the dissipation factor when series resistance is 5 ohm and capacitive resistance is 10 unit. a) 2 b) 0.5 c) 1 d) 0
Last Answer : b) 0.5
Description : If the values of 'C' and 'R' shown in the illustration were 1 microfarad and 100 kOhms respectively, at what listed time would 'C' be considered fully charged? EL-0086 A. 0.1 second B. 0.2 second C. 0.5 second D. 5 seconds
Description : If the values of 'C' and 'R' shown in the illustration were 1 microfarad and 100 kOhms, which of the listed time intervals would equal one 'time constant'? EL-0086 A. 0.1 second B. 0.2 second C. 0.5 second D. 5.0 seconds
Description : If the values of 'C' and 'R' shown in the illustration were 1 microfarad and 3 Megohms respectively, at what listed time would 'C' be considered fully charged? EL-0086 A. 0.33 second B. 3 seconds C. 6 seconds D. 15 seconds
Description : If the values of C and R shown in the illustration were 1-microfarad and 3- Megohms respectively, which of the listed intervals would equal one 'time constant'? EL-0086 A. 0.33 second B. 3 seconds C. 6 seconds D. 15 seconds
Description : The effective capacitance of four, 5-microfarad capacitors connected in series is: w) 0.20 microfarad x) 0.5 microfarad y) 1.0 microfarad z) 1.25 microfarad
Last Answer : ANSWER: Z -- 1.25 MICROFARAD
Description : if voltage is 230 Volts , frequency is 50 Hz and current is 1 ampere then what will be the resistance?
Last Answer : As V = 230v and I = 1A Therfore by ohm's law V =IR R = V/I =230/1 =230 ohm
Description : If the electricity represented by the wave form in 'B' were applied to the left side of the illustrated circuit, the output on the right side would be ____________. EL-0064 A. direct current with the ... lower lead D. clipped to a value equal to the square root of 3 times the input voltage value
Description : Assuming a standard 60 Hz. input to the circuit shown in the illustration, the ripple frequency would be ____________. EL-0085 A. 30 Hz B. 60 Hz C. 90 Hz D. 120 Hz