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 : effect of inductance and capacitance on performance of transmission line.
Last Answer : Following are the effect on performance of transmission line: 1. Due to inductance (L) voltage drop in transmission line produces. 2. Capacitor (C) draws charging current ... , transmission line efficiency, voltage regulation & also power factor of transmission line gets affected.
Description : What is capacitance?
Last Answer : Capacitance is the capacity of element to store electric charge in it. The unit of capacitance is Farad.
Description : Energy stored in electrostatic field of capacitance formula
Last Answer : Energy stored in electrostatic field of capacitance formula
Description : Capacitance
Last Answer : Capacitance formula
Description : The time constant of the capacitance circuit is defined as the time during which voltage?
Last Answer : The time constant of the capacitance circuit is defined as the time during which voltage rises to 63.2% of its final steady value.
Description : What is the reciprocal of capacitance?
Last Answer : The reciprocal of capacitance is called elastance, and its unit is the reciprocal farad, also called the daraf.
Description : Calculate the value of equivalent capacitance of the combination.
Last Answer : Calculate the value of equivalent capacitance of the combination
Description : Explain estimation of channel capacitance of CMOS.
Last Answer : Capacitance estimation: The dynamic response i.e. switching speed of MOS system depends on capacitance associated with the MOS devices which are formed by different layers in MOS transistors ... are due to three dimensional, distributed charge voltage relations within the device structure.
Description : A diode in which the change in reverse bias voltage varies the capacitance is called as A) Varactor diode B) Switching diode C) Tunnel diode D) Zener-diode
Last Answer : A diode in which the change in reverse bias voltage varies the capacitance is called as Varactor diode
Description : Capacitance is the ability of a body to store an__________. (A) electrical charge (B) electric current (C) voltage (D) All of the above
Last Answer : Capacitance is the ability of a body to store an electrical charge
Description : For 11 kV line the capacitance per km per phase will be of the order of: (A) 1 Farad (B) 0.1 Farad (C) 0.01 Farad (D) 0.01 microF
Last Answer : For 11 kV line the capacitance per km per phase will be of the order of: 0.01 Farad
Last Answer : Shunt capacitance is neglected while considering short transmission line.
Last Answer : Yes BJT have internal capacitances.
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
Last Answer : Answer: C
Description : 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50'. What number is missing? -Riddles
Last Answer : 22
Description : The current through a flashlight bulb is 40 mA and the total battery voltage is 4.5 V. The resistance of the bulb is approximately? A.112 ohms B.11.2 ohms C.1.2 ohms D.18 ohms
Last Answer : 112ohm
Description : If reading the AC voltage from a typical wall outlet, the range switch of the device illustrated should be set to ___________. EL-0047 A. 1,000 V B. 250 V C. R X 10,000 D. 10 ma/amps
Last Answer : Answer: B
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 : 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 : 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 : The amount of current in a resistor needs to be changed from 120 mA to 160 mA by changing the 24 V source, the new voltage will be: A. 8 V B. 320 V C. 3.2 V D. 32 V
Last Answer : The amount of current in a resistor needs to be changed from 120 mA to 160 mA by changing the 24 V source, the new voltage will be: 32 V
Description : An emf of 120 V causes a current of 3A to flow in a circuit how much energy is supplied by the source in 12 seconds. A. 4130 J B. 4310 J C. 4320 J D. None of these
Last Answer : An emf of 120 V causes a current of 3A to flow in a circuit how much energy is supplied by the source in 12 seconds. 4320 J
Description : When reading AC current with the multimeter shown in the illustration and you are unsure of the range, the range switch should be set to ___________. EL-0047 A. 10 MA/ 10 AMP with leads in the (-10 A ... leads in the (-COMMON) and (+10 A) jacks D. unable to measure AC current with this multimeter
Last Answer : Answer: D
Description : When attempting to measure AC current with the device shown and you are unsure of the range, the range switch should be set to __________. EL-0047 A. 10 MA / AMPS with leads in the (-10 A) and ... (-COMMON) and (+10 A) jacks D. unable to accurately measure AC current with this device as illustrated
Description : If there is a reduction in the normally supplied frequency to a 120/240 volt, threephase AC current motor from 60 hertz to 55 hertz, the motor would _____________. A. run at a slower speed B. operate at a lower current C. overheat D. trip off the line
Last Answer : Answer: A
Description : Basically, a magnetic amplifier is a saturable reactor with the addition of _____________. A. AC to the bias winding B. variable capacitance to all windings C. eddy current protectors D. a rectifier in the load circuit
Description : What is the relation between voltage and current in AC circuit containing only capacitance?
Last Answer : Current (I) is leading the voltage by 90°. I = V/XC amps. XC = 1/2πfC ohms. P = I * V * cosϕ watts. (Where cosϕ is 90 because current is leading the voltage by 90°. So cosϕ 90° = 0) ∴ P = I * V * 0 = 0 watts.
Description : What would happen if a DC motor was supplied with AC ?
Last Answer : With three phase induction motor, humming and not rotate, but if single phase universal motor like air blower, home mixture, motor run on constant speed..speed variation not possible...
Description : Total instantaneous power supplied by a 3-phase ac supply to a balanced R-L load is
Last Answer : Total instantaneous power supplied by a 3-phase ac supply to a balanced R-L load is constant
Description : In a contest, four fruits (an apple, a banana, an orange, and a pear) have been placed in four closed boxes (one fruit per box). People may guess which fruit is in which box. ... How many people have guessed three fruits correctly, and how many people have guessed four fruits correctly? -Riddles
Last Answer : It is not possible to guess only three fruits correctly: the fourth fruit is then correct too! So nobody has guessed three fruits correctly and 123-43-39-31 = 10 people have guessed four fruits correctly.
Description : In a contest, there are four fruits (an apple, a banana, an orange, and a pear) which have been placed in four closed boxes (one fruit per box). People may guess which fruit is ... guessed two correctly. How many people guessed three correctly and how many people guessed all four correctly? -Riddles
Last Answer : It is not possible to only get three correct because the fourth would also be correct. Therefore, the answer would be (123-43-39-31 = 10) 10 people guessed all four correctly.
Description : Find the median of the values 37, 31, 42, 43, 46, 25, 39, 45, 32. -Maths 9th
Last Answer : Arranging the data in ascending order, we have 25, 31, 32, 37, 39, 42, 43, 45, 46 Here, number of observations = 9 (odd) Median = value of (9+1 / 2)th Observation = Value of 5th Observation = 39
Description : The median of the data 18, 42, 31, 25, 26, 38 and 43 is _______.
Last Answer : The median of the data 18, 42, 31, 25, 26, 38 and 43 is _______. A. 31 B. 26 C. 25 D. 18
Description : What is 31.43 rounded to the nearest thenth?
Last Answer : It is 31.4 when rounded to the nearest tenth
Description : Find the orbital angular moment of a dipole with angular velocity of 1.6m/s and radius 35cm(in 10-31 order) a) 1.78 b) 8.71 c) 7.18 d) 2.43
Last Answer : a) 1.78
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.
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 : 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 : 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 : 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 : 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