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In alternator where the voltage drop occurs?
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In alternator voltage drop occurs in armature resistance, leakage reactance, and armature reactance.

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Description :

In an alternator at lagging power factor the generated voltage per phase as compared to that at unity power factor?

Answer :

In an alternator, at lagging power factor the generated voltage per phase as compared to that at unity power factor must be more than terminal voltage.

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Description :

The magnitude of various voltage drops that occur in an alternator depends on?

Answer :

The magnitude of various voltage drops that occur in an alternator depends on load current.

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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.

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Description :

State the concept of internal voltage drop.

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. 

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Description :

What is internal voltage drop and terminal voltage?

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.

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To determine the polarity of the voltage drop across a resistor, it is necessary to know?

Answer :

To determine the polarity of the voltage drop across a resistor, it is necessary to know direction of current through the resistor.

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How do you fix voltage drop?

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Description :

State working principle of alternator. State the meaning self and separate excitation. 

Answer :

Working principle of alternator: When a conductor is moved in magnetic field or a magnetic field moved with respect to conductor, according to Faraday's law of electromagnetic induction, the conductor ... like battery or shaft-mounted exciter, then the excitation is said to be separate excitation.

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Description :

Explain the construction of alternator with neat diagram.

Answer :

Diagram: Construction of three phase alternator: Construction wise, an alternator generally consists of field poles placed on the rotating fixture of the machine i.e. rotor as shown in the ... of rotor used in construction of alternator, 1. Salient pole type. 2. Cylindrical rotor type. 

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Description :

Is the speed of alternator is directly proportional to frequency?

Answer :

Yes, speed of alternator is directly proportional to frequency.

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At which power factor alternator is said to be overexcited?

Answer :

At leading power factor alternator is said to be overexcited.

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Description :

The power factor of an alternator depends on?

Answer :

The power factor of an alternator depends on load.

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Description :

Define armature reaction in an alternator. Explain the effect of armature reaction at various P.F. of loads of alternator.

Answer :

Armature Reaction: The effect of armature flux on main flux is called as armature reaction.  Armature Reaction at Various Power Factors: When armature is loaded, the armature flux modifies ... lagging p.f. For capacitive loads the effect of flux is partly distorting and partly strengthening.

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Description :

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.

Answer :

While keeping the excitation constant, if the steam supply of an alternator running in parallel with another identical alternator is increased, then Its portion of share in load will increase

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Description :

What causes diodes to fail in alternator?

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Description :

Draw equivalent circuit of alternator.

Answer :

Equivalent circuit of alternator

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Description :

Alternator

Answer :

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Description :

What is the frequency of an alternator which has 2 poles and makes 3600 revolutions per minute? A) 3600 HZ B) 60 Hz C) 120 Hz D) None of these

Answer :

What is the frequency of an alternator which has 2 poles and makes 3600 revolutions per minute? A) 3600 HZ B) 60 Hz C) 120 Hz D) None of these

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Description :

The fractional-pitch used for eliminating 7th harmonic from the emf wave of an alternator is (A) 2/3 (B) 5/6 (C) 7/8 (D) 6/7

Answer :

The fractional-pitch used for eliminating 7th harmonic from the emf wave of an alternator is 6/7

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Description :

Answer :

An alternator coupled to a hydraulic turbine runs at slow speed, as compared to others.

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Description :

Drop in alternator frequency is corrected by: (1) Damper winding (2) Increased prime mover output (3) Automatic voltage regulator (4) None of these

Answer :

Drop in alternator frequency is corrected by: Increased prime mover output

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Description :

Minimum voltage regulation occurs when the power factor of the load is?

Answer :

Minimum voltage regulation occurs when the power factor of the load is leading.

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Description :

When 7/0.029 V.I.R cable is carrying 20 A, a drop of 1 V occurs every 12 m. The voltage drop in a 100 m run of this cable when it is carrying 10 A is nearly  (a) 4.2 V (b) 3.2 V (c) 1.2 V (d) 0.42 V

Answer :

When 7/0.029 V.I.R cable is carrying 20 A, a drop of 1 V occurs every 12 m. The voltage drop in a 100 m run of this cable when it is carrying 10 A is nearly 1.2 V

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Description :

 In an alternator if the winding is short pitched by 60 electrical degrees, its pitch factor will be: A) 1.0 B) 0.866 C) 0.75 D) 0.50

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 In an alternator if the winding is short pitched by 60 electrical degrees, its pitch factor will be: A) 1.0 B) 0.866 C) 0.75 D) 0.50

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Description :

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

Answer :

If the excitation of an alternator operating in parallel with other alternators decreased, its: Power factor becomes more leading

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Description :

A field excitation of 20 A in a certain alternator results in an armature current of 400 A in short circuit and a terminal voltage of 2000 V on open circuit. The magnitude of the internal voltage drop within the machine at a load current of 200 A is  (A) 1 V (B) 10 V (C) 100 V (D) 1000 V

Answer :

A field excitation of 20 A in a certain alternator results in an armature current of 400 A in short circuit and a terminal voltage of 2000 V on open circuit. The magnitude of the internal voltage drop within the machine at a load current of 200 A is 1000 V

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An 8-pole alternator runs at 750 rpm and supplies power to a 6-pole induction motor which has a full load slip of 3 percent. The full load speed of the induction motor will be: 970 rpm

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Description :

 The driving power from the prime-mover driving the alternator is lost but the alternator remains connected to the supply network; the field supply also remains on. The alternator will: A) get burnt B) behave as an induction motor but will rotate in the opposite direction C) behave as a synchronous motor and will rotate in the same direction D) behave as a synchronous motor but will rotate in a reverse direction to that corresponding to generator action 

Answer :

The driving power from the prime-mover driving the alternator is lost but the alternator remains connected to the supply network; the field supply also remains on. The alternator will: behave as a synchronous motor and will rotate in the same direction

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Which alternator will have more number of poles ? (a) coupled to steam turbine (b) coupled to gas turbine (c) coupled to hydraulic turbine (d) None of the above 

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A 8 pole alternator rotates at 750 r.p.m. Its frequency is

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A 60 Hz, 2 pole alternator should run at • a. 3000 r.p.m. c. 1500 r.p.m. • b. 3600 r.p.m. d. 1800 r.p.m.

Answer :

A 60 Hz, 2 pole alternator should run at 3600 r.p.m.

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State the advantages of use of high voltage in transmission of Electric power. 

Answer :

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image
Answer :

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

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State standard voltage in India for the following : (i) Generation Voltage (ii) Primary Transmission Voltage

Answer :

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 An independent voltage source in series with an impedance ZS=R+jXS delivers a maximum average power to a load impedance ZL when ZL = R-jXS

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A diode in which the change in reverse bias voltage varies the capacitance is called as A) Varactor diode B) Switching diode C) Tunnel diode D) Zener-diode  

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A diode in which the change in reverse bias voltage varies the capacitance is called as Varactor diode

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A change of 4% in the supply voltage to an induction motor will produce a change of approximately

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A change of 4% in the supply voltage to an induction motor will produce a change of approximately 8% in the rotor torque

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The permissible voltage variation in transmission and distribution system is:  (A) ± 0.1% (B) ± 1% (C) ±10% (D) ± 25%

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The permissible voltage variation in transmission and distribution system is: ±10%

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A 3-phase voltage source inverter operates in 180° conduction mode with a star connected resistive load. If input dc voltage is 100 V, then the peak to peak output line voltage is : 200 V

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Answer :

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