Description : A circuit has a resistance of 200 ohms. The resistance of the circuit can be reduced to 120 ohms by adding which of the following to the circuit. w) 80 ohm resistor in series x) 150 ohm resistor in parallel y) 240 ohm resistor in series z) 300 ohm resistor in parallel
Last Answer : ANSWER: Z -- 300 OHM RESISTOR IN PARALLEL
Description : An LED is operated on a 12 volt automobile circuit. The voltage drop across the LED is 2 volts and the current must be limited to 50 milliamps to prevent its overheating and destruction. What size resistor must be used? w) 60 ohms x) 100 ohms y) 120 ohms z) 200 ohms
Last Answer : ANSWER: Z -- 200 OHMS
Description : Two identical resistors are connected in parallel and consume 200 watts together. A third identical resistor is added in parallel. The total power consumed is: w) 100 watts x) 200 watts y) 300 watts z) 400 watts
Last Answer : ANSWER: Y -- 300 WATTS
Description : A 10 ohm and a 20 ohm resistor are connected in parallel to a current source. What fraction of the current flows through the 20 ohm resistor? w) 1/2 x) 1/3 y) 2/3 z) 3/4
Last Answer : ANSWER: X -- 1/3
Description : A 20 ohm resistor and a 60 ohm resistor are connected in parallel to a voltage source. If the current in the 60 ohm resistor is one ampere, the current in the 20 ohm resistor will be: w) 1/3 ampere x) 2/3 ampere y) 1 ampere z) 3 amperes
Last Answer : ANSWER: Z -- 3 AMPERES
Description : A series circuit consists of a two ohm RESISTOR and a one ohm INDUCTOR. The relationship between current and voltage is: w) current will lag by 30 degrees. x) current will lag by 26 degrees. y) current will lead by 26 degrees. z) current will lead by 30 degrees.
Last Answer : ANSWER: X -- CURRENT WILL LAG BY 26 DEGREES.
Description : A five ohm and a ten ohm resistor are connected in parallel, what single resistance is "equivalent" to this combination?
Last Answer : ANSWER: 3 AND 1/3 OHM
Last Answer : A metal resistor has resistance of 10 ohm at 0°C and 11 ohms at 160°C, the temperature coefficient is 0.000625 /°C.
Description : Four equal resistors are connected in parallel, each resistor has an ohmic value of 100 ohms, what is the equivalent resistance?
Last Answer : 25 ohms
Description : A resistor of value R/2 is connected in parallel with a resistor of value R/3. The voltage drop across the parallel combination is V. The total current supplied by the voltage source is: w) 2 V/R (read: 2 V over R) x) 3 V/R (read: 3 V over R) y) 4 V/R (read: 4 V over R) z) 5 V/R (read: 5 V over R)
Last Answer : ANSWER: Z -- 5 V/R
Description : Four amperes of current are measured through a 24 ohms resistor connected across a voltage source. How much voltage does the source produce? A.960 V B.9.6 V C.96 V D.8 V
Last Answer : Four amperes of current are measured through a 24 ohms resistor connected across a voltage source. How much voltage does the source produce? A.960 V B.9.6 V C.96 V D.8 V
Description : Why not high resistance for earth fault than using grounding transformer & resistor 0.45 ohms?
Last Answer : It is mechanically unwide. Difficult to manufacture.
Description : What is the resistance value indicated by the multimeter scale illustrated, if the range switch is set at R X 100, and the needle is at the position indicated by the letter 'Y'? EL-0047 A. 220 ohms B. 240 ohms C. 2,400 ohms D. 24,000 ohms
Last Answer : Answer: C
Description : 24 cells of emf `1.5 V` each having internal resistance of 1 ohm are connected to an external resistance of `1.5` ohms. To get maximum current,
Last Answer : 24 cells of emf `1.5 V` each having internal resistance of 1 ohm are connected to an external ... in series and 4 such rows are connected in parallel
Description : Liquid "X" is at equilibrium with its vapor in a cylinder and piston apparatus. When the volume of the space above the liquid is 50 ml and the temperature 25!, the vapor pressure of "X" is 120 torr. What will the ... 25!C? Some liquid is always present. w) 30 torr x) 60 torr y) 120 torr z) 240 torr
Last Answer : ANSWER: Y -- 120 TORR
Description : A load with an impedance of 440 ohms is connected across the secondary of the transformer illustrated. If the input voltage is 110 VAC and the step-up ratio is 10 to 1, what will be the primary current? EL-0055 A. 2.5 amps B. 25 amps C. 250 amps D. current cannot be determined with information given
Last Answer : Answer: B
Description : A 5 kilogram mass is lifted at constant velocity from a shop floor by a rope that passes through a pulley attached to the shop's ceiling. Neglecting the mass of the rope and friction in the pulley, what is the approximate tension in the rope? w) 100 newtons x) 50 newtons y) 25 newtons z) 5 newtons
Last Answer : ANSWER: X -- 50 NEWTONS
Description : A flywheel rotating at 5 revolutions per second is brought to rest by a constant torque in 10 seconds. How many revolutions does the flywheel make while coming to a stop? w) 25 x) 50 y) 75 z) 100
Last Answer : ANSWER: W -- 25
Description : A light ray traveling from glass into air strikes the glass-air surface at an angle 50 degrees to the normal. If the critical angle for the glass-air combination is 42 degrees, the percentage of light reflected from the surface is w) 6 x) 25 y) 38 z) 100
Last Answer : ANSWER: Z -- 100
Description : When 2,4 and 6 ohms resistor are connected in parallel their resultant equivalent resistance will be A. 12ohm b. 11/12ohm C. 12/11ohm d. None
Last Answer : C. 12/11ohm
Description : An ammeter with an internal resistance of 50 ohm(s) is used to measure a current thorugh a lod resistor Rl = 1 kohm(s). Determine the percentage error of the reading due to ammeter insertion.
Last Answer : 50/(50+1k)*100 = 4.76%
Description : If the energy is supplied from a source, whose resistance is 1 ohm, to a load of 100 ohms the source will be?
Last Answer : If the energy is supplied from a source, whose resistance is 1 ohm, to a load of 100 ohms the source will be a voltage source.
Description : Three unequal resistor in parallel are equivalent to a resistance `1` ohm If two of them are in the ratio `1:2` and if no resistance value is fraction
Last Answer : Three unequal resistor in parallel are equivalent to a resistance `1` ohm If two of them are in the ratio `1:2` and ... in ohm is A. 4 B. 6 C. 8 D. 12
Description : 52 A transformer has 1000 primary turns, connected to 250V ac supply. To get 400V secondary voltage the no of secondary turns should be A. 1600 B. 250 C. 400 D. 1250
Last Answer : A. 1600
Description : Why 6.6 kV transformer is resistance grounded by 10 ohms and current limited to 400 A?
Last Answer : a) To reduce burning and melting in faulted switchgear or machine. b) To reduce mechanical stresses in equipment. c) To reduce the electrical hazards by stray ground fault currents in the ground ... screen in 6.6 kV XLPE (cross-linked polyethylene). Therefore the cost of the cable decreases.
Description : A carbon resistor has a resistance of 50 ohms, and a tolerance of 5 percent. What are the colors of bands one, two, three, and four, respectively?
Last Answer : The bands are green, black, black, and gold.
Description : A coil is wound with 400 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. 4.8 amps B. 7.06 amps C. 10.65 amps D. 11.27 amps
Description : Average power dissipated in resistor if sinusoidal p.d of peak value 25 V is connected across a 20 Ω resistor is A. 15.6 W B. 15 W C. 16 W D. 17 W
Last Answer : 15.6 W
Description : What voltage would be measured across the 45 ohm resistor?
Last Answer : Not enough information. But if you know the current, you can useOhm's Law (just multiply the resistance times the current).
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 : When troubleshooting most electronic circuits, 'loading effect' can be minimized by using a voltmeter with a/an ___________________. A. input impedance much greater than the impedance across which the voltage ... sensitivity of less than 1000 ohms/volt D. sensitivity of more than 1000 volts/ohm
Last Answer : Answer: A
Description : A 10,000-watt motor operates an elevator weighing 5000 newtons. Assuming no frictional losses, how high is the elevator raised in 10 seconds. Is it raised: w) 2 meters x) 20 meters y) 50 meters z) 100 meters
Last Answer : ANSWER: X -- 20 METERS
Description : Which one of the following is the way in which a galvanometer is converted into a voltmeter? Is it by connecting: w) a high resistance coil in parallel with its moveable coil x) a low resistance ... coil in series with its moveable coil z) a low resistance coil in series with its moveable coil
Last Answer : ANSWER: Y -- A HIGH RESISTANCE COIL IN SERIES WITH ITS MOVEABLE COIL
Description : What is the resistance value indicated by the multimeter scale illustrated, if the range switch is set at R X 1 and the needle is at the position indicated by the letter 'Y'? EL-0047 A. 2.2 ohms B. 24 ohms C. 240 ohms D. 2,400 ohms
Description : What law describes the force between two stationary electrically charged objects? w) Ampere's law x) Coulomb's law y) Kirchoff's Rules (pron: kir-koff rules) z) Ohm's law
Last Answer : ANSWER: X -- COULOMB'S LAW
Description : The force acting between two point charges can be computed using which of the following laws? w) Ohm's Law x) Ampere's Law y) Coulomb's Law z) Newton's Second Law.
Last Answer : ANSWER: Y -- COULOMB'S LAW
Description : To convert a galvanometer to a voltmeter, you should add a: w) high resistance in series x) high resistance in parallel y) low resistance in series z) low resistance in parallel
Last Answer : ANSWER: W -- HIGH RESISTANCE IN SERIES
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 : Which one of the following laws best describes the operation of an electric generator? w) Ampere's Law x) Gauss' Law y) Ohm's Law for Conductors z) Faraday's Law of Induction
Last Answer : ANSWER: Z -- FARADAY'S LAW OF INDUCTION
Description : Induced electric currents can be explained using which of the following laws? w) Gauss's Law x) Faraday's Law y) Ohm's Law z) Ampere's Law
Last Answer : ANSWER: X -- FARADAY'S LAW
Description : Electric current may be expressed in which one of the following units? w) coulombs/volt x) joules/coulomb y) coulombs/second z) ohms/second
Last Answer : ANSWER: Y -- COULOMBS/SECOND
Description : A flywheel connected to a punching machine has to supply energy of 400 Nm while running at a mean angular speed of 20 rad/s. If the total fluctuation of speed is not exceed to in kgm 2 is 1. 25 2. 50 3. 100 4. 125
Last Answer : 1. 25
Description : What is the phase angle of an ohm inductor in series with an ohm resistor connected to a 5 KHz source?
Last Answer : You need to provide values of resistor and inductor etc to find the phase angle.
Description : The density of lead is 12 grams per cm3. A lead brick has a mass of 1.5 kilograms. Its dimensions are 10 cm by 5 cm by 4 cm. Is it: w) More than 75% hollow x) Between 50 and 75% hollow y) Between 25 and 50% hollow z) Between 0 and 25% hollow
Last Answer : ANSWER: Y -- BETWEEN 25 AND 50% HOLLOW
Description : The magnetizing reactance of a 4 kV/ 400 V, 50 Hz single-phase transformer on low voltage side is 35 Ω. The magnetizing reactance on the high voltage side is (A) 0.35 Ω (B) 3.5 Ω (C) 350 Ω (D) 3500 Ω
Last Answer : 3500
Description : The approximate average yearly rainfall in centimeters for the United States is: w) 25 centimeters x) 50 centimeters y) 75 centimeters z) 100 centimeters
Last Answer : ANSWER: Y -- 75 CENTIMETERS
Description : 50 The equivalent resistance of the primary of the transformer having K = 5, R1 = 0.1 ohm when referred to secondary becomes .....ohm A. 0.5 B. 0.02 C. 0.004 D. 2.5
Last Answer : A. 0.5
Description : A round viewing window with a 20 centimeter diameter is installed in a tank at the Shedd Aquarium. It is 5 meters below the water surface. The force on the window is approximately: w) 1,500 Newtons x) 10,000 Newtons y) 25,000 Newtons z) 50,000 Newtons
Last Answer : ANSWER: W -- 1,500 NEWTONS
Description : If a sled has a constant acceleration of 2 meters per second squared and starts from rest, the distance in meters that it will have covered after 5 seconds is: w) 10 meters x) 20 meters y) 25 meters z) 50 meters
Last Answer : ANSWER: Y -- 25 METERS
Description : The half-life of an isotope of an element is 5 days. The mass of a 10 gram sample of this isotope remaining after 20 days is: w) 0.312 grams x) 0.625 grams y) 1.25 grams z) 2.50 grams
Last Answer : ANSWER: X -- 0.625 GRAMS