**Description :** State the concept of internal voltage drop.

**Last Answer :** Concept of internal voltage drop: Every practical source offers some opposition to the current due to its internal parts or components. e.g. a 12V battery has electrodes made up of conducting ... internal voltage drop, the terminal voltage of practical voltage source is always less than its emf.

**Description :** What is internal voltage drop and terminal voltage?

**Last Answer :** It is not permissible to just connect the positive terminal to the negative terminal of a cell with a copper wire. It will overheat and get damaged. This happens because the electromotive force (emf) ... than the nominal voltage (emf) of the cell and this lower voltage is called terminal voltage.

**Last Answer :** In order that current should flow without causing excessive heating or voltage drop, the relay contacts should have low contact resistance, be clean and smooth, be of sufficient size and proper shape.

**Description :** In alternator where the voltage drop occurs?

**Last Answer :** In alternator voltage drop occurs in armature resistance, leakage reactance, and armature reactance.

**Description :** Polarity Test of Transformer

**Last Answer :** Polarity Test of Transformer

**Description :** Why phasing out and polarity test is carried out on three phase transformer?

**Last Answer :** The phasing out test is carried out to identify the windings (primary and secondary) of corresponding phase of the three phase transformer. The polarity test is carried out to identify the ... identical polarity of the primary and secondary windings of each phase of the three phase transformer.

**Description :** What is the need of polarity marking in polyphase AC circuits?

**Last Answer :** Need of Polarity Marking in Polyphase AC Circuits: i) Polarity marking of terminals provides reference polarity for better understanding of system, even if the polarity of ac voltage changes ... of current transformers in relay protection circuit and getting desired performance is very difficult.

**Last Answer :** In D.C. generators the polarity of the interpoles is the same as that of the main pole ahead.

**Description :** In MOSFET, the polarity of the inversion layers is the same as that of?

**Last Answer :** In MOSFET, the polarity of the inversion layers is the same as that of majority carriers in the source.

**Description :** Do Zener diodes have polarity?

**Last Answer :** Yes, Zener diode have polarity Anode(+) and Cathode (-). And Zener Diode are connected into circuit with their cathode as positive terminal because they operate in reverse bias mode.

**Description :** A DC voltage source is connected across a series RLC circuit. Under steady-state conditions, the applied DC voltage drops entirely across the

**Last Answer :** A DC voltage source is connected across a series RLC circuit. Under steady-state conditions, the applied DC voltage drops entirely across the C only

**Description :** In the circuit shown the voltage drop across the `15Omega` resistor is `30 V` having the polarity as indicated. The ratio of potential difference acro

**Last Answer :** In the circuit shown the voltage drop across the `15Omega` resistor is `30 V` having the ... difference across `5Omega` and resistance `R` is

**Description :** A network contains linear resistors and ideal voltage sources. If values of all the resistors are doubled then the voltage across each resistor will

**Last Answer :** A network contains linear resistors and ideal voltage sources. If values of all the resistors are doubled then the voltage across each resistor will not change

**Description :** Which of the following theorems enables a number of voltage (or current) source to be combined directly into a single voltage (or current) source. (1) compensation theorem (2) reciprocity theorem (3) superposition theorem (4) Millman's theorem

**Last Answer :** Which of the following theorems enables a number of voltage (or current) source to be combined directly into a single voltage (or current) source. (1) compensation theorem (2) reciprocity theorem (3) superposition theorem (4) Millman's theorem

**Description :** The internal resistances of an ideal current source, and an ideal voltage source are, respectively, (A) 0, ∞ (B) ∞, ∞ (C) ∞, 0 (D) 0,0

**Last Answer :** The internal resistances of an ideal current source, and an ideal voltage source are, respectively, ∞, 0

**Description :** A network is said to be under resonance when the voltage and the current at the network input terminals are (A) in phase (B) out of phase (C) in phase quadrature (D) in phase, and have equal magnitudes

**Last Answer :** A network is said to be under resonance when the voltage and the current at the network input terminals are in phase

**Description :** An ideal voltage source has?

**Last Answer :** An ideal voltage source has zero internal resistance.

**Description :** For a voltage source?

**Last Answer :** For a voltage source terminal voltage cannot be higher than source e.m.f.

**Description :** An ideal voltage source should have?

**Last Answer :** An ideal voltage source should have zero source resistance.

**Description :** Source transformation Replace the circuit with voltage source in series with a single resistor

**Last Answer :** Source transformation Replace the circuit with voltage source in series with a single resistor

**Description :** The voltage drop, for constant voltage transmission is compensated by installing (a) inductors (b) capacitors (c) synchronous motors (d) all of above (e) none of the above

**Last Answer :** (c) synchronous motors

**Description :** Self induced voltage across an inductance

**Last Answer :** Self induced voltage across an inductance

**Description :** An SSB transmitter produces a peak-to-peak voltage of 200 V across a 100 Ω antenna load. What is the Peak Envelope Power? A) 49.98 W B) 79.98 W C) 99.96 W D) 199.93 W

**Last Answer :** An SSB transmitter produces a peak-to-peak voltage of 200 V across a 100 Ω antenna load. What is the Peak Envelope Power? A) 49.98 W B) 79.98 W C) 99.96 W D) 199.93 W

**Description :** What is the RMS voltage in a series RL circuit, if the voltage across R and L is 256 V and 192 V respectively? A) 320 V B) 448 V C) 64 V D) None of these

**Last Answer :** What is the RMS voltage in a series RL circuit, if the voltage across R and L is 256 V and 192 V respectively? A) 320 V B) 448 V C) 64 V D) None of these

**Description :** When the voltage across a battery is measured using a D.C potentiometer, the reading shows 1.08 V. But when the same voltage is measured using a Permanent Magnet Moving Coil (PMMC) voltmeter, the voltmeter reading shows 0.99 ... resistance of the battery, in Ohm , is (A) 150 (B) 100 (C) 50 (D) 200

**Last Answer :** When the voltage across a battery is measured using a D.C potentiometer, the reading shows 1.08 V. But when the same voltage is measured using a Permanent Magnet Moving Coil (PMMC) voltmeter, ... resistance of the voltmeter is 1100 Ohm , the internal resistance of the battery, in Ohm , is 100

**Description :** Two resistances Rl and Ri are connected in series across the voltage source where Rl>Ri. The largest drop will be across?

**Last Answer :** Two resistances Rl and Ri are connected in series across the voltage source where Rl>Ri. The largest drop will be across Rl.

**Description :** An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms?

**Last Answer :** An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms, both resistance and inductance carry equal currents.

**Last Answer :** The voltage appearing across the contacts after opening of the circuit breaker is called recovery voltage.

**Description :** A linear network has a current input 4cos(ω t + 20º)A and a voltage output 10 cos(ωt +110º) V. Determine the associated impedance.

**Last Answer :** Solution

**Description :** What would be the voltage drop across the series resistor of the circuit shown in the illustration if the source is 30 volts, the resistance of R1 is 10 ohms, R2 is 10 ohms and R3 is 10 ohms? EL-0032 A. 5 volts B. 10 volts C. 20 volts D. 30 volts

**Last Answer :** Answer: C

**Description :** In a simple series circuit, the entire source voltage will drop across ______________. A. the resistor next to the negative terminal B. a short circuit C. the resistor next to the positive terminal D. an open circuit

**Last Answer :** Answer: D

**Description :** Which of the following statements concerning a simple parallel resistance circuit is correct? A. The voltage drop across each resistor is the same. B. The total current flow equals the reciprocal ... resistances. D. The total voltage equals the sum of the individual voltages across each resistance.

**Last Answer :** Answer: A

**Description :** If current of 20 mA is passing through op-amp and voltage drop across series resistor is 10 V then value of resistance is A. 500Ω B. 400Ω C. 300Ω D. 200Ω

**Last Answer :** 500Ω

**Description :** If the current was increased to 4 amps, what would be the voltage drop across each resistor in the circuit described in question 17?

**Last Answer :** E1 = 80 volts. E2 = 240 volts. E3 = 320 volts

**Description :** What is the voltage drop across the resistor in an RC charging circuit when the charge on the capacitor is equal to the battery voltage?

**Last Answer :** Zero.

**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 :** 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 :** If the rms voltage drop across a 15 kilt resistor is 16 V, the peak current through the resistor is : - a) 15 mA b) 1.5 mA c) 10 mA d) 1 mA

**Last Answer :** If the rms voltage drop across a 15 kilt resistor is 16 V, the peak current through the resistor is : - 1.5 mA

**Description :** A uniformly-loaded D.C. distributor is fed at both ends with equal voltages. As compared to a similar distributor fed at one end only, the drop at the middle point is (a) one-fourth (b) one-third (c) one-half (d) twice (e) none of the above

**Last Answer :** (a) one-fourth

**Last Answer :** Req= (1/1200 +1/560 + 1/2.1)^-1 = 2.1 ohms RT= 2.1 + 7.8 = 9.9 ohms IT = V/R = 24/9.9 = 2.4 A Veq= R I = 2.1 2 ... 7.8 = 12.096 w = 44.928 w _________________________________________ By: Ellis-Junior Kamatjipose [email protected]

**Description :** As shown in the illustration, the direction of electron flow through the component is _______. EL-0079 A. from terminal 'B' to terminal 'A' B. from terminal 'A' to terminal 'B' C. determined by the polarity of the applied voltage D. opposite from that in a resistor

**Last Answer :** Answer: B

**Description :** Determine the voltage drop across the resistance `R_(1)` in the circuit given in Fig. 4.55 with `epsilon=90 V, R_(1)=5 k Omega, R_(2)=5k Omega, R_(3)=

**Last Answer :** Determine the voltage drop across the resistance `R_(1)` in the circuit given in Fig. 4.55 with `epsilon=90 V, ... k Omega " and " R_(4)=10 k Omega`.

**Description :** Why does surge impedance loading (SIL) increase with increase in voltage level?

**Last Answer :** Answer: SIL varies as the square of the operating voltage, so SIL increases with increase in voltage level

**Description :** Electro-mechanical voltage regulators are generally used in (a) reactors (b) generators (c) transformers (d) all of the above

**Last Answer :** (b) generators

**Description :** When an alternator connected to the bus-bar is shut down the bus-bar voltage will (a) fall (b) rise (c) remain unchanged (d) none of the above

**Last Answer :** (c) remain unchanged

**Description :** The frequency of voltage generated, in case of generators, can be increased by (a) using reactors (b) increasing the load (c) adjusting the governor (d) reducing the terminal voltage (e) none of the above

**Last Answer :** (c) adjusting the governor

**Description :** When the interconnector between two stations has large reactance (a) the transfer of power will take place with voltage fluctuation and noise (b) the transfer of power will take place with least loss ... out of step be¬cause of large angular displacement between the stations (d) none of the above

**Last Answer :** (c) the stations will fall out of step be¬cause of large angular displacement between the stations

**Description :** For transmission of power over a distance of 500 km, the transmission voltage should be in the range (a) 150 to 220 kV (b) 100 to 120 kV (c) 60 to 100 kV (d) 20 to 50 kV

**Last Answer :** (a) 150 to 220 kV

**Description :** Constant voltage transmission entails the following disadvantage (a) large conductor area is required for same power transmission (b) short-circuit current of the system is increased (c) either of the above (d) none of the above

**Last Answer :** (b) short-circuit current of the system is increased

**Description :** In a tap changing transformer, the tappings are provided on (a) primary winding (b) secondary winding (c) high voltage winding (d) any of the above

**Last Answer :** (b) secondary winding