# the division of active power amongst alternators running in parallel depends upon

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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)

## Related questions

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

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

The degree of protection by ground wire depends upon the a. Arcing angle b. Shielding angle c. Power factor d. All of above

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

The rate of rise of transient recovery voltage (TRV) depends upon the circuit (a) power factor (c) frequency (b) voltage (d) breaking current

The speed of a synchronous motor depends upon  (1) supply voltage (2) supply frequency (3) number of poles (4) both supply frequency and number of poles

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Hysteresis loss in a transformer depends upon: -  a) both voltage and frequency b) voltage alone c) frequency alone d) none of these

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.

Frequency of oscillation of an AMV depends upon  1. RC values of the circuit 2. Collector load resistors 3. Transistor 4. Width of input pulse

Name the types of generators (alternators) used in (1) thermal plant and (2) in hydel power plant.

The diameter of conductor used in LT 660 V grade power cables depends on

The size of a conductor used in power cables depends on the:  (A) operating voltage  (C) current to be carried (B) power factor (D) type of insulation used

The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is?

The sensitivity of a closed loop system to gain changes and load disturbances depends upon (a) forward gain (b) loop gain (c) frequency (d) all the above

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

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The ratio of active power to apparent power is known as____ factor.

The RRRV depends upon

A single-phase ac voltage source has 200 V rms and a system connected consumes an active power of 300 W. What is the reactive power consumed by the system if 2.5 A rms current is drawn ?  (a) 100 VAR (b) 200 VAR (c) 300 VAR (d) 400 VAR

Write the factors on which capacity of parallel plate condenser depends.

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

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In voltage source converter based HVDC transmission system the active power is controlled by changing (A) phase angle of the converter ac input voltage (B) supply frequency of the converter ac input voltage (C) magnitude of the converter ac input voltage (D) DC voltage at the inverter terminals

Power factor of running induction motor is better when (1) Running at half load (2) Full load (3) ¾ of load (4) None of the above

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

The active power of a synchronous generator can be varied mainly by (a) changing field excitation (b) changing of prime mover speed (c) both (a) and (b) (d) none of the above

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Which amongst the following has a negative coefficient of temperature for resistance?  a) Copper b) Lead c) Carbon d) Aluminium

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The power loss in a transmission line depends on (a) current in the line. (b) resistance of the line. (c) length of the line. (d) All of the above

Consider the following statements :  1. Salient pole alternators have small diameters and large axial lengths.  2. Cylindrical rotor alternators have a distributed winding.  3. Cylindrical rotor alternators are wound for large number of poles.  4. Salient pole alternators run at speeds slower than cylindrical rotor machines.  Which of the above statements are correct ?  (a) 1 and 3 only (b) 2 and 4 only (c) 1 and 4 only (d) 2 and 3 only

The capital cost of a power plant depends on  (1) Total installed capacity only. (2) Total number of units only. (3) Total installed capacity and number of units as well. (4) Neither the installed capacity nor number of units