Description : An electrical component is connected across a 120 volt 60 hertz AC supply. What is the current drawn by the component if the impedance is 200 ohms? A. 0.01 amperes B. 0.60 amperes C. 1.67 amperes D. 100 amperes
Last Answer : Answer: B
Description : Two 100 watt light bulbs are connected in parallel across a 100 volt power supply. The total power developed in the circuit is _______________. A. 200 watts B. 100 watts C. 50 watts D. equal to the product of the amperes times the voltage in each branch
Last Answer : Answer: A
Description : Battery capacities are given in _____________. A. volts B. volt-amperes C. volt-hours D. ampere-hours
Last Answer : Answer: D
Description : The ratio of the effective value of the counter EMF in volts, to the effective value of the current in amperes is called _____________. A. impedance factor B. capacitive reactance C. inductive reactance D. root mean square
Last Answer : Answer: C
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
Description : As shown in the illustration, the function of the switch labeled 'PFSW' is to determine the ______________. EL-0003 A. bus frequency B. reactive volt amperes of the bus C. frequency of either generator D. power factor of either generator
Description : What current is required to light two 75 watt lamps and one 40 watt lamp when connected in series to a 120 volt power source? A. 0.161 amperes B. 0.631 amperes C. 1.583 amperes D. 6.199 amperes
Description : Electric current is the flow of electrons through a conductor. The rate of this flow is measured as ___________. A. volts/watt B. amperes/centimetre C. coulombs/second D. ohms/volt
Description : The ratio of full -load volt-amperes to short-circuit volt-amperes is equal to :
Last Answer : The ratio of full -load volt-amperes to short-circuit volt-amperes is equal to : Z (p.u)
Description : The per unit impedance of a circuit element is 0.30. If the base kV and base MVA are halved, then the new value of the per unit impedance of the circuit element will be: (A) 0.3 (B) 0.6 (C) 0.003 (D) 0.006
Last Answer : 3
Description : The per unit impedance ofa circuit element is 0.15. If the base kV and base MVA are halved, then the new value of the per unit impedance of the circuit element will be?
Last Answer : The per unit impedance ofa circuit element is 0.15. If the base kV and base MVA are halved, then the new value of the per unit impedance of the circuit element will be 0.30.
Description : The distance between a generator and its load is 100 feet. What would be the approximate total voltage drop across a two wire supply cable if the current were 5.5 amperes and the resistance of the wire were 2.525 ohms per 1,000 feet? A. 0.5 volts B. 1.38 volts C. 1.90 volts D. 2.77 volts
Description : For a battery with constant voltage, the reflection coefficient is (a) ∞ (b) – 1 (c) 1 (d) 0
Last Answer : 0
Description : Unit to measure capacity of battery is
Last Answer : Unit to measure capacity of battery is Ampere-hour
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 : Compare BJT common base configuration with common collector configuration on the basis of (i) Current gain (ii) Voltage gain (iii) Input impedance (iv) Output impedance
Last Answer : Parameter Common Base Common Collector Current gain Low (About 1) High (1+β) Voltage gain High 1 Input impedance Low High Output impedance High Low
Description : The best indication about the state of charge on a lead acid battery is given by_______.
Last Answer : The best indication about the state of charge on a lead acid battery is given by specific gravity of electrolyte
Description : The change in base current will be A) 0.66 micro ampere B) 6.6 micro amperes C) 66 micro amperes D) 660 micro amperes.
Last Answer : A) 0.66 micro ampere
Description : Ten Coulombs of charge flowing through a wire per second is equal to: w) 100 Amperes x) 10 Ampere y) 1 Amperes z) 0.1 Amperes
Last Answer : ANSWER: X -- 10 AMPERES
Description : A device which can be used to check the calibration of a circuit breaker is a _________________. A. 500 volt megohmmeter B. portable low voltage high current testing unit C. standard digital multimeter D. clamp-on voltmeter
Description : Two transformers of identical voltages but different capacities are operated in parallel, for satisfactory load sharing: a) Impedances should be equal b) Per unit impedance must be equal c) per unit impedance and X/R ratio must be equal d) Impedance and X/R ratio must be equal
Last Answer : Ans: C
Description : Which of the following precautions should be taken when a blown fuse, rated at 10 amperes, is replaced? A. Short out the fuse before removing it from the circuit. B. Use needle-nose pliers to ... D. Fuses of 10 ampere rating and less are virtually harmless when energized and may be handled freely.
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 : Which of the following precautions should be taken when troubleshooting various power circuits using a common solenoid-type mechanical voltage tester (wiggins)? A. Never use this tester on circuits greater ... voltage expected in the circuit in order to prevent damage from an off-scale reading.
Description : A simply supported beam carries a uniformly distributed load over the whole span.The deflection at the centre is y.If the distributed load per unit length is doubled and also depth of beam is doubled ,then the deflection at the centre would be a.2y b.4y c.y/2 d.y/4.
Last Answer : d.y/4.
Description : What is the SI unit of electric current? (1) Amperes (2) Coulombs (3) Joules (4) Watts
Last Answer : (1) Amperes Explanation: The SI unit for measuring an electric current is the am pere, which is the flow of electric charge across a surface at the rate of one coulomb per second.
Description : If voltage across a bulb rated 220 volt-100 watt drops by `2.5 %` of its value, the percentage of the rated value by which the power would decrease is
Last Answer : If voltage across a bulb rated 220 volt-100 watt drops by `2.5 %` of its value, the percentage of the rated value ... 20%` B. `2.5%` C. `5%` D. `10%`
Description : Two transformers operating in parallel will share the load depending upon their (A) Rating. (B) Leakage reactance. (C) Efficiency. (D) Per-unit impedance.
Last Answer : Ans: A Transformers having higher kVA rating will share more load.
Description : The capacity of a battery is measured in (a) Watts (b) Watt-hours (c) Amperes (d) Ampere-hours
Last Answer : Amper-hours
Description : When cells are arranged in parallel:
Last Answer : When cells are arranged in parallel: current capacity increases
Description : A battery of 40 V and three capacitors of 1000 μF, 500 μF and 100 μF are all connected in (I) parallel and (II) series. The ratio of total charge stored in case I to that in case II is approximately (a) 3 : 64 (b) 64 : 3 (c) 160 : 3 (d) 104 : 5
Last Answer : A battery of 40 V and three capacitors of 1000 μF, 500 μF and 100 μF are all connected in (I) parallel and (II) series. The ratio of total charge stored in case I to that in case II is approximately 104 : 5
Description : The condition of electrolyte in a battery is measured in terms of
Last Answer : The condition of electrolyte in a battery is measured in terms of specific gravity
Description : A 120 Ah capacity battery can deliver a current of 8A for a period of
Last Answer : A 120 Ah capacity battery can deliver a current of 8A for a period of 15
Description : Which gas is produced during charging of a lead-acid battery
Last Answer : Hydrogen gas is produced during charging of a lead-acid battery
Description : Indicate the false statement A. The noise generated in a resistance or the resistive component of any impedance is random. B. Random noise power is proportional to the bandwidth over which is measured ... exist D. All formula referring to random noise are applicable only to the value of such noise.
Last Answer : C. A random voltage across the resistor does not exist
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
Description : A load with an impedance of 440 ohms is connected across the secondary of the device 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
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 : A current of 4 amperes flowing for 45 minutes deposits 1.062 gm of metal at cathode. Calculate the equivalent weight of the metal. (Given 1 Faraday = 96500 C)
Last Answer : Given: c : 4 amperes t : 45 minutes : 45 x 60 = 2700 seconds w : 1.062 gm 1 Faraday : 96500 C To calculate: Eq. Weight (CE) According to Faraday's first law: w = z c t Therefore, z = w / ct ... g/c Now, C.E. = 96500 x E.C.E. C. E. = 96500 x 0.00009833 C.E. = 9.4888 gm
Description : Unit of resistance is – (1) volt² x ampere (2) volt/ampere (3) ampere/volt (4) volt x ampere
Last Answer : (2) volt/ampere Explanation: An ohm (0) is the SI derived unit of electrical resistance. By definition, a conductor has an electrical resistance of one ohm when a constant potential difference of one volt applied ... ampere (WA) is the SI derived unit, which is equal to ohm by definition 0 = V/A.
Description : The base of a right triangular prism is an equilateral triangle. If the height is halved and each side of the base is doubled, find the ratio of the -Maths 9th
Last Answer : 1 : 2 Let each side of the base of the original prism be a units and the height of the prism be h units. Then Required ratio = Vol. of original prismVol. of new prismVol. of original ... )2×h3√4×(2a)2×h234×(a)2×h34×(2a)2×h2 = 2a2h4a2h2a2h4a2h = 1 : 2.
Description : Pick out the wrong statement. (A) Longer tubes are less expensive per unit heat transfer area as compared to shorter tubes (B) A cost index is merely a number for a given year ... butt welded joints are less expensive compared to lap welded joints, because squaring of plates is not necessary
Last Answer : (D) Plates with butt welded joints are less expensive compared to lap welded joints, because squaring of plates is not necessary
Description : Gauss' law of electricity, Gauss' law of magnetism, Faraday's law of induction, and Amperes' law form the basic equations of electromagnetism. This combination is collectively known as: w) Coulomb's equations x) Volta's equations y) Fermi's equations z) Maxwell's equations
Last Answer : ANSWER: Z -- MAXWELL'S EQUATIONS
Description : The rate at which electrical energy is used is measured in w) volts x) amperes y) joules z) watts
Last Answer : ANSWER: Z -- WATTS
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 : 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 : 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 : 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 : If the resistance of a circuit is cut in half and the applied voltage is kept constant, the current flow will be _____________. A. doubled B. quadrupled C. unchanged D. cut in half
Description : In an AC dynamo, the speed at which the coil rotates is doubled. How would this affect a) the frequency of output voltage b) the maximum output voltage?
Last Answer : a) Frequency is doubled b) Maximum output voltage is doubled.