1 Answer

Answer :

The resistance of a 230 V, 100 W lamp is 529 Ω.

Related questions

Last Answer : The resistance of a 100 W, 200 V lamp is 400 ohm.

Last Answer : The ratio of the resistance of a 100 W, 220 V lamp to that of a 100 W, 110 V lamp will be nearly 4.

Description : A filament bulb `(500 W, 100 V)` is to be used in a `230 V` main supply. When a resistance `R` is connected in series, it works perfectly and the bulb

Last Answer : A filament bulb `(500 W, 100 V)` is to be used in a `230 V` main supply. When a resistance `R` is ... Omega` B. `46 Omega` C. `26Omega` D. `13 Omega`

Description : A series combination of resistance 100 ohm and capacitance 50µf is connected in series to a 230 V, 50HZ supply. Calculate (i) Capacitive reactance (ii) Current (iii) Power factor (iv) Power consumed 

Last Answer : For RC series circuit

Description : Three 60 W bulbs are in parallel across the 230 V power line. If one bulb burns out

Last Answer : Three 60 W bulbs are in parallel across the 230 V power line. If one bulb burns out the other two bulbs will remain glowing

Description : Current in a 60 W light bulb when it is connected to a 230 V power supply is A. 0.26 A B. 1.5 A C. 2.6 A D. 3.9 A

Last Answer : 0.26 A

Description : A d.c. voltage of 230 V is imposed on an unloaded 230 V, 50 Hz transformer, it will (A) give high secondary voltage (B) burn out (C) give secondary voltage as per k (D) None of these

Last Answer : A d.c. voltage of 230 V is imposed on an unloaded 230 V, 50 Hz transformer, it will burn out

Description : A 230 V/460 V single-phase transformer operating at 20 A and unity power factor has primary referred resistance of 0.2 Ω and reactance of 0.5 Ω. The approximate primary induced emf is (A) 216 V (B) 226 V (C) 234 V (D) 236 V

Last Answer : A 230 V/460 V single-phase transformer operating at 20 A and unity power factor has primary referred resistance of 0.2 Ω and reactance of 0.5 Ω. The approximate primary induced emf is 226 V

Description : The meter constant of a single-phase 230 V induction watt hour meter is 400 revolutions per kWh. The speed of the meter disc for a current of 10 A of 0.9 pf lagging will be

Last Answer : The meter constant of a single-phase 230 V induction watt hour meter is 400 revolutions per kWh. The speed of the meter disc for a current of 10 A of 0.9 pf lagging will be 13.80 rpm

Description : One single-phase energy meter operating on 230 V and 5 A for 5 hours makes 1940 revolutions. Meter constant is 400 rev/kWh. The power factor of the load is

Last Answer : One single-phase energy meter operating on 230 V and 5 A for 5 hours makes 1940 revolutions. Meter constant is 400 rev/kWh. The power factor of the load is 0.8

Last Answer : A heater is rated as 230 V, 10 kW, A.C. The value 230 V refers to r.m.s. voltage.

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 : Which of the following statements is true if a 100 watt lamp and a 75 watt lamp are connected in parallel across a 100 volt power supply? A. The 75 watt lamp will draw as much current as the 100 ... Current flow will be the same across each lamp. D. The 75 watt lamp will have a higher resistance.

Last Answer : Answer: D

Description : If 200w, 100 w and 60 w lamps connected in series with 230V AC , which lamp glow brighter? Each lamp voltage rating is 230V.

Last Answer :  Each bulb when independently working will have currents (W/V= I)  For 200 Watt Bulb current (I200) =200/230=0.8696 A  For 100 Watt Bulb current (I100) =100/230=0.4348 A  ... current through it. So minimum power dissipated across it as min current X equal Voltage across =s min power dissipation

Description : Two electric bulbs rated 50 W and 100 W are glowing at full powr, when used in parallel with a battery of emf 120 V and internal resistance 10 `Omega`

Last Answer : Two electric bulbs rated 50 W and 100 W are glowing at full powr, when used in parallel with a battery of emf 120 V ... power, is A. 6 B. 4 C. 2 D. 8

Description : Ionisation potential applied across the electrodes of electrostatic tar precipitator is around (A) 230 V AC (B) 60 KV AC (C) 230 V DC (D) 60 KV DC

Last Answer : (D) 60 KV DC

Description : Ionisation potential employed in the industrial electrostatic precipitator is of the order of (A) 30 to 70 kV DC (B) 30 to 70 kV AC (C) 230 V AC (D) 230 V DC

Last Answer : (A) 30 to 70 kV DC

Description : The voltage of the single phase supply to residential consumers is (a) 110 V (b) 210 V (c) 230 V (d) 400 V

Last Answer : (c) 230 V

Description : The voltage of the single phase supply to residential consumers is (a) 110 V (b) 210 V (c) 230 V (d) 400 V

Last Answer : (c) 230 V

Description : An AC supply of 230 V is applied to half wave rectifier circuit. A transformer turns ratio is 20 : 1. Find i) Output DC voltage (ii) Peak Inverse Voltage (PIV)

Last Answer : Solution:

Description :  An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V 

Last Answer :  An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V 

Description : A single-phase, 230 V, 50 Hz ac mains fed step down transformer (4:1) is supplying power to a half-wave uncontrolled ac-dc converter used for charging a battery (12 V dc) with the series current limiting resistor being 19.04 Ohm. The charging current is  (A) 2.43 A (B) 1.65 A (C) 1.22 A (D) 1.0 A

Last Answer : A single-phase, 230 V, 50 Hz ac mains fed step down transformer (4:1) is supplying power to a half-wave uncontrolled ac-dc converter used for charging a battery (12 V dc) with the series current limiting resistor being 19.04 Ohm. The charging current is 1.0 A

Description : The locked rotor current in a 3-phase, star connected 15 , kW 4 , pole 230 V , 50 Hz induction motor at rated conditions is 50 A. Neglecting losses and magnetizing current, the approximate locked rotor line current drawn when the motor ... Hz supply is  (A) 58.5 A (B) 45.0 A (C) 42.7 A (D) 55.6 A

Last Answer : The locked rotor current in a 3-phase, star connected 15 , kW 4 , pole 230 V , 50 Hz induction motor at rated conditions is 50 A. Neglecting losses and magnetizing current, the approximate locked rotor line current drawn when the motor is connected to a 236 , V 57 Hz supply is 45.0 A 

Description : A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is (A) 4.5 V (B) 6.75 V (C) 9 V (D) 13.5 V

Last Answer : A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is 9 V

Description : In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load, the input source current is (A) sinusoidal current (B) constant dc current (C) continuous rectangular pulses (D) alternating rectangular pulses

Last Answer : In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load, the input source current is alternating rectangular pulses

Description : The low voltage winding of a 400/230 V, 1-phase, 50 Hz transformer is to be connected to a 25 Hz, the supply voltage should be

Last Answer : The low voltage winding of a 400/230 V, 1-phase, 50 Hz transformer is to be connected to a 25 Hz, the supply voltage should be 115 V.

Description : The Lamp resistance of a mini-torch light, operating on 1.5 volts is classified as _____________resistance. A. Low B. Medium C. High D. None of these 

Last Answer : The Lamp resistance of a mini-torch light, operating on 1.5 volts is classified as Medium resistance.

Description : The hot resistance of a tungsten lamp is about 10 times the cold resistance. Accordingly, cold resistance of a 100 W, 200 V lamp will be

Last Answer : The hot resistance of a tungsten lamp is about 10 times the cold resistance. Accordingly, cold resistance of a 100 W, 200 V lamp will be 40 ohm.

Description : A lamp of 100W at 200V is supplied current at 100 volts. It will be equivalent to the lamp of:   a. 50W b. 40W c. 25W d. 10W 

Last Answer : A lamp of 100W at 200V is supplied current at 100 volts. It will be equivalent to the lamp of: 25W

Description :  If shunt generator delivers 100 A at 200 V, and the resistance of the shunt field and armature are 100 ohm and 0.01 ohm respectively, the generated e.m.f. will be : -  a) 212 V b) 205 V c) 210 V d) 201.02 V

Last Answer :  If shunt generator delivers 100 A at 200 V, and the resistance of the shunt field and armature are 100 ohm and 0.01 ohm respectively, the generated e.m.f. will be : - 201.02 V

Description : A 1mA D' Arsonval movement has resistance of 100 Ω. It is to be converted to a 10 V voltmeter. The value of multiplier resistance is  (A) 999 Ω (B) 9999 Ω (C) 9900 Ω (D) 990 Ω 

Last Answer : C) Rs = (10/1x10^-3) - 100 Rs = 9900

Description : When a voltage of 132 VDC is applied to the illustrated circuit with a resistance of 10,230 ohms the current will be ________. EL-0018 A. 0.012 amps B. 77.5 milliamps C. 10,362 amps D. 0.792 amps

Last Answer : Answer: A

Description : When a voltage of 124 VDC is applied to the illustrated circuit with a resistance of 10,230 ohms the current will be________. EL-0018 A. 0.012 amps B. 82.50 amps C. 10.354 amps D. 0.8439 amps

Last Answer : Answer: A

Description : When a voltage of 112 VDC is applied to the circuit illustrated with a resistance of 10,230 ohms the current will be________. EL-0018 A. .010 amps B. .913 amps C. 103 m amps D. 934 m amps

Last Answer : Answer: A

Description : When a voltage of 110 VDC is applied to the circuit illustrated with a resistance of 10,230 ohms the current will be________. EL-0018 A. 0.0107 amps B. 93 amps C. 10,340 amps D. .951 amps

Last Answer : Answer: A

Description : When a voltage of 115 VDC is applied to the illustrated circuit with a resistance of 10,230 ohms the current will be _______ EL-0018 A. 88.95 milliamps B. 103.45 milliamps C. 11.24 milliamps D. 0.91 amps

Last Answer : Answer: C

Description : The filament of an electric lamp becomes white hot but the lead-in wires holding the filament are only slightly heated because they (a) have smaller current passing through them (b) have very low resistance (c) have higher melting point (d) are made of black iron

Last Answer : Ans:(b)

Description : The purpose of choke in a fluorescent lamp is – (1) to increase the current flow (2) to decrease the current flow (3) to decrease the resistance (4) to decrease the voltage momentarily

Last Answer : (2) to decrease the current flow Explanation: The choke primarily serves to limit current flow to the correct level for the tube. It also can be used during startup to provide an inductive 'kick' forming a momentary highervoltage pulse to start the lamp.

Description : A lamp is provided with 110 volts and draws a current of 0.8 amps. What is the resistance of the lamp? A. 12.2 ohms B. 88.0 ohms C. 122.2 ohms D. 137.5 ohms

Last Answer : Answer: D

Description : A lamp has a source voltage of 110 volts and a current of 0.9 amps. What is the resistance of the lamp? A. 0.008 ohms B. 0.08 ohms C. 12.22 ohms D. 122.22 ohms

Last Answer : Answer: D

Description : The purpose of choke in a fluorescent lamp is : (1) to increase the current flow (2) to decrease the current flow (3) to decrease the resistance (4) ro decrease the voltage momentarily

Last Answer :  to decrease the current flow

Description : If an incandescent lamp of 80 ohms resistance takes a current of 0.75 ampere, what voltage is required to light it? A.45 volts B.60 volts c.23 volts D.None of these

Last Answer : V=IR    = 80*0.75     = 60 volts

Description : In a lamp load when more than one lamp are switched on the total resistance of the load?

Last Answer : In a lamp load when more than one lamp are switched on the total resistance of the load decreases.

Description : Char value of Kerosene is the amount of charred oil deposition on the wick obtained after burning it in a standard wick lamp at a standard rate for 24 hours. Char value of a good quality kerosene should be less than __________ mg/kg of kerosene. (A) 1 (B) 20 (C) 100 (D) 500

Last Answer : (B) 20

Description : A potential difference of V = 100 ± 2 volt, when applied across a resistance R gives a current of 10 ± 0.5 ampere.

Last Answer : A potential difference of V = 100 2 volt, when applied across a resistance R gives a current of 10 ... percentage error in R given by R = V/I.

Description : In the circuit shown the cells `A` and `B` have negligible resistance. For `V_(A) = 12 V, R_(1) = 500 Omega` and `R = 100 Omega`, the galvanometer `(G

Last Answer : In the circuit shown the cells `A` and `B` have negligible resistance. For `V_(A) = 12 V, R_(1) = 500 Omega` and ` ... A. 4 V B. 2 V C. 12 V D. 6 V

Description : A galvanometer has a coil of resistance `100 Omega` and gives a full-scale deflection for `30 mA` current. If it is to work as a voltmeter of `30 V` r

Last Answer : A galvanometer has a coil of resistance `100 Omega` and gives a full-scale deflection for `30 mA` current. ... Omega` C. `1000 Omega` D. `1800 Omega`

Description : When a resistance of 100`Omega` is connected in series with a galvanometer of resistance R, then its range is V. To double its range, a resistance of

Last Answer : When a resistance of 100`Omega` is connected in series with a galvanometer of resistance R, then its range ... 800`Omega` C. 900`Omega` D. 100`Omega`

Description : A wire of length 100 cm is connected to a cell of emf 2 V and negligible internal resistance. The resistance of the wire is `3 Omega`. The additional

Last Answer : A wire of length 100 cm is connected to a cell of emf 2 V and negligible internal resistance. The ... B. `47Omega` C. `57Omega` D. `35Omega`