29 views
in Electrical Engineering by
When two alternators A and B are operating in parallel, the increase in steam supply to alternator A will cause the active power output of (1) Alternator A to be decreased and alternator B to be increased (2) Alternators A and B is not affected (3) Alternators A and B is increased (4) Alternator A to be increased and alternator B to be decreased

Related questions

1 answer 11 views

When two alternators are operating in parallel, the cause for circulating current is (A) increase in the excitation of one machine (B) increase in the driving torque of one machine (C) reduction in angular velocity of one machine (D) identical speed/load characteristics of both machines

asked Apr 25, 2018 in Electrical Engineering by Shimroz123
1 answer 13 views

If the excitation of an alternator operating in parallel with other alternators decreased, its: (1) Power factor becomes more leading (2) Output Kw will change (3) Power factor becomes more lagging (4) Power factor becomes unity

asked May 22, 2018 in Alternator by Shimroz123
1 answer 23 views

Two 550 kVA alternator operate in parallel to supply the following loads I. 250 KW at 0.95 p.f. lagging II. 100 KW at 0.85 p.f. leading One machine is supplying 200 KW at 0.9 p.f. lagging. The p.f. of other machine must be

asked Apr 1, 2018 in Electrical Engineering by Shimroz123
1 answer 23 views

While keeping the excitation constant, if the steam supply of an alternator running in parallel with another identical alternator is increased, then (A) It would over-run the other alternator (B) Its rotor will fall back in phase with respect to the other machine (C) Its portion of share in load will increase (D) Its power factor would be decreased.

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 23 views

Two synchronous generators operating in parallel supply a common load of 2.5 MW. The frequency-power characteristics have a common slope of 1 MW/Hz and the no-load frequencies of the generators are 51.5 Hz and 51.0 Hz, respectively. Then the system frequency is (A) 50 Hz (B) 51 Hz (C) 51.25 Hz (D) 51.5 Hz

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 17 views

Two transformers with identical voltage ratings are working in parallel to supply common load. The percentage impedance of one transformer is higher compared to that of other. The load sharing between the two transformer will: (1) Be proportional to their percentage impedance (2) Be independent of their percentage impedance (3) Be inversely proportional of their respective impedance (4) Depend on the resistance to leakage reactance ratio of each transformer

asked May 22, 2018 in Transformer by Shimroz123
1 answer 41 views

Two synchronous generators G1, G2 are operating in parallel and are equally sharing KVAR (Lag) component of load. To shift part of KVAR from G2 to G1, while keeping terminal voltage fixed, the following action must be done

asked May 3, 2018 in Power system by Shimroz123
0 answers 42 views

When two synchronous machines are connected in parallel the synchronizing power tends to (A) accelerate the faster machine (B) retard the faster machine (C) retards the slower machine (D) pull the faster machine out of step

asked Jun 4, 2018 in Synchronous machine by Shimroz123
1 answer 16 views

When two transformer of different kVA rating are connected in parallel they share the load in proportion to their respective kVA rating only when their:

asked May 22, 2018 in Transformer by Shimroz123
1 answer 33 views

Two 220 volt lamps, one of 60 watt and the other of 75 watt are connected in series across a 440 volt supply. The potential difference across 60 watt lamp will be: A) 195 volt B) 220 volt C) 245 volt D) 440 volt

asked Jun 4, 2018 in Electrical Engineering by Shimroz123
1 answer 13 views

A 3-phase induction motor is running at slip ‘s’. If its two supply leads are interchanged, then the operating slip at that instant will be:

asked May 22, 2018 in Induction Machine by Shimroz123
0 answers 8 views

 When alternator excitation increases and machine is operating at lagging power factor then (A) Armature current increases (B) Armature current decreases (C) Armature current remains unchanged (D) Armature voltage remains unchanged

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
1 answer 23 views

Two 3-phase, Y-connected alternators are to be paralleled to a set of common busbars. The armature has a per phase synchronous reactance of 1.7 Ohm and negligible armature resistance. The line voltage of the first machine is adjusted to 3300 V and that of the second machine is adjusted to 3200 V. The machine voltages are in phase at the ... are paralleled. Under this condition, the synchronizing current per phase will be  (A) 16.98 A (B) 29.41 A (C) 33.96 A (D) 58.82 A

asked May 17, 2018 in Alternator by Shimroz123
1 answer 10 views

When two 100 kΩ resistors are connected in parallel, net resistance is

asked May 15, 2018 in Electrical Engineering by Shimroz123
1 answer 38 views

For a two -port reciprocal network, the three transmission parameters are A = 4, B = 7 and C = 5. What is the value of D ?  (a) 9.5 (b) 9.0 (c) 8.5 (d) 8.0

asked Apr 25, 2018 in Electrical Engineering by Shimroz123
0 answers 121 views

Two heater wires of equal length are connected first in series and then in parallel. The ratio of heat generated from series to parallel connection will be (a) 4 : 1 (b) 2 : 1 (c) 1 : 2 (d) 1 : 4

asked May 25, 2018 in Electrical Engineering by Shimroz123
1 answer 19 views

The supply both to field and armature circuits are disconnected simultaneously in a separately excited dc motor and it comes to a standstill in 5 sec. If the armature circuit of this motor is disconnected from supply with field circuit remaining energized, the motor would come to rest in (1) 5 sec (2) 7 sec (3) 4 sec (4) A very long time  

asked Apr 11, 2018 in Electrical Engineering by Shimroz123
2 answers 26 views

How will the total capacitance change, when two capacitors are connected in parallel?

asked May 29, 2018 in Capacitor by Shimroz123
0 answers 323 views

The purpose of following program fragment  b = s + b;  s = b - s;  b = b - s;  where s and b are two integers is to  (1) transfer the contents of s to b (2) transfer the contents of b to s (3) exchange the contents of s and b (4) negate the contents of s and b

asked Apr 10, 2018 in Computer Engineering by Shimroz123
0 answers 10 views

There are two bearings. Bearing A, rotating at 5000RPM and Bearing B, rotating at 200 RPM. How will you lubricate the above bearings?  A) Bearing A with Oil & Bearing B with Grease B) Bearing B with Oil & Bearing A with Greas C) Both with Oil D) Both with Grease

asked Apr 9, 2018 in Electrical Engineering by Shimroz123
1 answer 22 views

A minimum clearance of 6.3 m to ground is required for overhead lines when operating voltages are :  (A) less than 66 kV (B) lie between 66 kV and 110 kV (C) more than 165 kV (D) lie between 110 kV and 165 kV

asked Apr 30, 2018 in Electrical Engineering by Shimroz123
1 answer 22 views

When four resistances of 2W 1W; 5W 2W; 10W 5W and 15W 10 W are connected in parallel, the greatest power is absorbed by • 2 W, 1 W • 5 W, 2 W • 10 W, 5W • 15 W, 10 W

asked May 13, 2018 in Electrical Engineering by Shimroz123
1 answer 48 views

Two 100W, 200V lamps are connected in series across a 200V supply. The total power consumed by each lamp will be in Watts

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 43 views

Two parallel conductors are separated by a distance, d carrying a current, I in the same direction. The magnetic field along a line running parallel to the conductors and midway between them is (A) zero (B) proportional to I (C) proportional to d (D) proportional to the permeability of the medium. 

asked Jun 4, 2018 in Electrical Engineering by Shimroz123
2 answers 23 views

Three lamps are connected in parallel across a 120 Volt source. If one lamp burns out, the remaining two will be: A. Glow dimmer B. Glow brighter C. Not light D. Glow with the same brightness as before

asked Apr 12, 2018 in Electrical Engineering by Shimroz123
0 answers 16 views

the division of active power amongst alternators running in parallel depends upon (1) speed-load characteristics of prime mover (2) V-I characteristics of alternator (3) Excitation voltages of alternators (4) Both (b) and (c) 

asked Apr 11, 2018 in Electrical Engineering by Shimroz123
1 answer 11 views

Three capacitors 15µf, 18µf and 12µf are connected in a circuit. Find equivalent capacitance when they are connected in – 1) Series 2) Parallel

asked Sep 2, 2018 by Shimroz123
1 answer 25 views

Two transformers operating in parallel will share the load depending upon their

asked May 12, 2018 in Transformer by Shimroz123
0 answers 19 views

What is the nature of supply current in parallel RC circuit with reference to the voltage?  (A) In phase (B) Lags by 90 degree (C) Leads by 90 degree (D) Compensates and becomes zero 

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
1 answer 11 views

The three non -inductive loads of 5 kW, 3 kW and 2 kW are connected in a star network between R, Y and B phases and neutral. The line voltage is 400 V. The current in the neutral wire is nearly (a) 11 A (b) 14 A (c) 17 A (d) 21 A

asked Apr 25, 2018 in Electrical Engineering by Shimroz123
0 answers 18 views

When ‘n’ resistances each of value ‘r’ are connected in parallel, then the resultant resistance is ‘x’. When these ‘n’ resistances are connected in series, total resistance is  (A) n2X (B) X/n (C) n2/X (D) nX2

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
1 answer 9 views

 When A = 0., B = 0, C = 1 then in two input logic gate we get gate  (A) XOR gate (B) AND gate (C) NAND gate (D) NOR gate

asked May 17, 2018 in Digital Electronics by Shimroz123
0 answers 440 views

A 220 V, 200 W bulb and a 220 V, 100 W bulb are connected in series across a 220 V supply, the power consumed by them will be (a) 33.3 W (b) 66.6 W (c) 100 W (d) 300 W

asked May 25, 2018 in Electrical Engineering by Shimroz123
1 answer 23 views

When a V-V three phase transformer system is converted into a Δ-Δ system, increase in capacity of the system is (A) 86.6% (B) 50% (C) 57.7% (D) 73.2%

asked Apr 28, 2018 in Electrical Engineering by Shimroz123
1 answer 18 views

What is the slip (as a percentage) when a 6 pole single phase induction motor operating on 220 V and 60 Hz is rotating at speed of 1140 rpm? A) 60% B) 5% C) 10% D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 24 views

What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
0 answers 14 views

For a two port symmetric bilateral network, if A= 3Ω and B = 1Ω, the value of parameter C will be  (A) 4s (B) 6s (C) 8s (D) 16s

asked Apr 5, 2018 in Electrical Engineering by Zeeshan
1 answer 18 views

Two transformers are to be operated in parallel such that they share load in proportion to their kVA ratings. The rating of the first transformer is 500 kVA ratings. The rating of the first transformer is 500 kVA and its pu leakage impedance is 0.05 pu. If the rating of second transformer is 250 kVA, its pu leakage impedance is  (A) 0.20 (B) 0.10 (C) 0.05 (D) 0.025

asked May 17, 2018 in Transformer by Shimroz123
0 answers 21 views

A large transformer operating at no load draws an exciting current Io of 5A, when the primary is connected to a 120 V, 60 Hz source. From a wattmeter test, it is known that iron losses are equal to 180 W. Calculate the reactive power absorbed by the core.  (A) 600 var (B) 572 var (C) 180 var (D) 360 var 

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
1 answer 26 views

When the phase difference between two sinusoidal quantities is 90° they are said to be ______ A) Phase right angle B) Phase quadrature C) Phase sinuright D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
0 answers 86 views

 When The dc converter in figure shown has a resistance load of R = 10 Ω and the input voltage is Vs 220 V the converter switch remains on, its voltage drop is Vo -2 V. The chopping frequency is fI K sW Vs If the duty cycle is 50%, determine: (a) the average output voltage V (b) the RMS output voltage Vo (c) the converter efficiency (d) the effective input resistance of the converter

asked Apr 26 by Hussein
1 answer 28 views

What happens to the voltage in the secondary when the frequency of the supply in the primary is decreased? A) It increases B) It decreases C) It remains the same D) Cannot say unless the actual percentage increase in the frequency is known

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
0 answers 18 views

When the SCR conducts, the forward voltage drop will   (a) 0.7 V at all load current (b) 2 to 2.5 V at all load current (c) increases slightly with load current (d) remains constant with load current 

asked Apr 10, 2018 in Electrical Engineering by Shimroz123
1 answer 87 views

There resistors of 3Ω, 10Ω, and 15Ω are connected in parallel to a 30 V circuit the current that will flow through the 3Ω resistor is 

asked Mar 29, 2018 in Electronics Engineering by Shimroz123
1 answer 35 views

What would be the total power drawn from the supply, when two heaters, rated at 1000 W, 250 V each are connected in series across a 250 V, 50 Hz supply?  (A) 1000 W (B) 500 W (C) 250 W (D) 2000 W

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
1 answer 24 views

Which two values are plotted on a B-H curve graph : -  a) reluctance and flux density b) permeability and reluctance c) magnetizing force and permeability d) flux density and magnetizing force

asked Apr 11, 2018 in Electrical Engineering by Shimroz123
1 answer 18 views

When three resistors with unequal values are connected in parallel, _______ A) The current across the resistors is the same  B) The voltage drop across the resistors is the same C) The voltage drops across the resistors is proportional to the resistance of each resistor D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123

Welcome to electronics2electrical.com here you can ask questions related to electrical, electronics, mechanical, telecommunication, instrumentation, computer, mathematics, physics etc.
Be respectful to all the members. Do not copy and paste the answers from other websites which have copyright content. While asking question give full details about it.

Categories

Most popular tags

power motor dc circuit transformer voltage current used system phase resistance factor synchronous load ac energy induction electric generator series frequency between speed capacitor use electrical meter line difference control type mosfet transmission magnetic plant high single instrument bjt unit source advantages function diode and machine winding field define torque parallel amplifier supply shunt thyristor motors electricity arduino maximum time relay armature problem value on transformers types coil diagram state flow ratio material three formula starting direction theorem method emf operating efficiency digital wave microprocessor test instruments inductance loss measure operation connected signal low applications effect single-phase network temperature working constant losses different law wattmeter measuring compare controlled breaker drive device logic rc full switch flux wire resistivity disadvantages free of materials machines angle force converter conductor transistor gain open protection scr core measurement number bridge principle generators reactance circuits negative the friction iron loop short pole battery conservation steam resistors hysteresis computer using analog lines secondary station gate a rectifier inverter linear induced relays nuclear capacitance basic characteristics design direct work rotor electronics ammeter forces diesel damping rlc connection factors capacitors minimum insulation moving regulation running self systems air fault range main stability quality starter igbt eddy alternator ideal rl average 3-phase plants arc thermal error fuzzy biasing dielectric pressure balanced superposition errors copper rotation feedback impedance measured electronic electrons charge inductive transfer explain start off back curve over solar is three-phase tariff locomotive peak bias zener engineering commutator surge conductors rating universal potentiometer density permanent mechanical transducer capacity memory adc excitation two fuse pure harmonics application semiconductor inductor internal pmmc reaction welding resonance traction permeability breakers rms designed electromagnetic si generation brushes switching capacitive shaded rate 1 distribution resistor methods delta star oscillator reluctance simplification algebra 8085 boolean weston dynamometer insulating strength installation definition fuel heating earth units
...