Salient-pole rotors may be used in alternators driven by what types of prime movers?

Salient-pole rotors may be used in alternators driven by  what types of prime movers?
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1 Answer

Answer :

Internal combustion engines, water force and electric motors
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Related questions

What are the prime movers used for a) Salient pole alternator, b) Non- salient pole alternator.

Description : What are the prime movers used for a) Salient pole alternator, b) Non- salient pole alternator.

Last Answer : The prime movers used for salient pole alternators are water wheels likeKaplan turbine, Francis turbine, Pelton wheel etc., and diesel or petrol engines. The prime movers used for non-salient pole alternators are steam turbines and gas turbines.

Consider the following statements : 1. Salient pole alternators have small diameters and large axial lengths....

Description : 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 ... 3 only (b) 2 and 4 only (c) 1 and 4 only (d) 2 and 3 only

Last Answer : 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 ... 3 only (b) 2 and 4 only (c) 1 and 4 only (d) 2 and 3 only

What Are The Various Types Of Rotors Used In The Alternators?

Description : What Are The Various Types Of Rotors Used In The Alternators?

Last Answer : Salient pole rotor Non- salient pole rotor and Cylindrical rotor

An 8 pole wound rotor induction motor operating on 60 Hz supply is driven at 1800 r.p.m. by a prime mover in

Description : An 8 pole wound rotor induction motor operating on 60 Hz supply is driven at 1800 r.p.m. by a prime mover in the opposite direction of revolving magnetic field. The frequency of the rotor current is (a) 30 Hz (b) 60 Hz (c) 120 Hz (d) 180 Hz 

Last Answer : 30 Hz As the frequency of the rotor is given by  F= N*P/120 so from the above equation the frequency of the rotor current can be easily calculated  i.e. 1800×8/120=30 Hence the required value of rotor frequency is 30 Hz

Which of the two main types of rotors can have either a single winding or three Y-connected windings?

Description : Which of the two main types of rotors can have either a single winding or three Y-connected windings?

Last Answer : The drum or wound rotor.

Which of the following types of DC motors has its field connected in parallel with its armature? A. Counter EMF B. Shunt C. Salient pole D. Series

Description : Which of the following types of DC motors has its field connected in parallel with its armature? A. Counter EMF B. Shunt C. Salient pole D. Series

Last Answer : Answer: B

What are the two basic types of alternators?

Description : What are the two basic types of alternators?

Last Answer : Rotating armature and rotating field.

Write about prime movers?

Description : Write about prime movers?

Last Answer : Prime mover converts the kinetic energy of water into mechanical energy to produce electrical energy. Pelton wheel turbine, Francis turbine, Kaplan turbine and Propeller turbine are prime movers used in hydraulic power plants.

Write about prime movers?

Description : Write about prime movers?

Last Answer : Prime mover converts the kinetic energy of water into mechanical energy to produce electrical energy. Pelton wheel, turbine, Francis turbine, Kaplan turbine and Propeller turbine are prime movers used in hydraulic power plants.

Write About Prime Movers?

Description : Write About Prime Movers?

Last Answer : Prime mover converts the kinetic energy of water into mechanical energy to produce electrical energy. Pelton wheel, turbine, Francis turbine, Kaplan turbine and Propeller turbine are prime movers used in hydraulic power plants.

What are the steam prime movers?

Description : What are the steam prime movers?

Last Answer : Steam prime movers are machines which convert heat energy in to mechanical energy    OR  Steam prime movers are i) Impulse Type ii) Reaction Type

What two receiver leads are reversed to reverse the rotor's direction of rotation?

Description : What two receiver leads are reversed to reverse the rotor's direction of rotation?

Last Answer : 1 and S3.

What is the relationship between the transmitter and receiver stator voltages when their rotors are in correspondence?

Description : What is the relationship between the transmitter and receiver stator voltages when their rotors are in correspondence?

Last Answer : The voltages are equal and oppose each other.

What type of rotor is used in split-phase motors? A. Drum B. Salient pole C. Squirrel-cage D. Wound-rotor

Description : What type of rotor is used in split-phase motors? A. Drum B. Salient pole C. Squirrel-cage D. Wound-rotor

Last Answer : Answer: C

What are the advantages of salient pole type of construction used for synchronous machines?

Description : What are the advantages of salient pole type of construction used for synchronous machines?

Last Answer : 1. They allow better ventilation. 2 The pole faces are so shaped radial air gap length increases from the pole center to the pole tips so that flux distribution in the air gap is ... 3 Due the variable reluctance, the machine develops additional reluctance power, which is independent of excitation.

In a salient pole synchronous machine (usual symbols are used): (A) xq > xd (B) xq = xd (C) xq < xd (D) 0

Description : In a salient pole synchronous machine (usual symbols are used): (A) xq > xd (B) xq = xd (C) xq < xd (D) 0

Last Answer : Ans: C Since reluctance on the q axis is higher, owing to the larger air gap, hence xq < xd

If the field circuits of an unloaded salient pole synchronous motor gets suddenly open circuited, then (A) The motor stops. (B) It continues to run at the same speed. (C) Its runs at the slower speed. (D) It runs at a very high speed.

Description : If the field circuits of an unloaded salient pole synchronous motor gets suddenly open circuited, then (A) The motor stops. (B) It continues to run at the same speed. (C) Its runs at the slower speed. (D) It runs at a very high speed.

Last Answer : Ans: B The motor continues to run at the same speed because synchronous motor speed does not depend upon load, Nα f.

A salient pole synchronous motor is running at no load. Its field current is switched off. The motor will (A) come to stop. (B) continue to run at synchronous speed. (C) continue to run at a speed slightly more than the synchronous speed. (D) continue to run at a speed slightly less than the synchronous speed.

Description : A salient pole synchronous motor is running at no load. Its field current is switched off. The motor will (A) come to stop. (B) continue to run at synchronous speed. (C) continue to run at ... more than the synchronous speed. (D) continue to run at a speed slightly less than the synchronous speed.

Last Answer : (B) continue to run at synchronous speed.

A three phase, salient pole synchronous motor is connected to an infinite bus. It is operated at no load a

Description : A three phase, salient pole synchronous motor is connected to an infinite bus. It is operated at no load a normal excitation. The field excitation of the motor is first reduced to zero ... First increases and then decreases steeply (C) First decreases and then increases steeply (D) Remains constant

Last Answer : B

The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole)

Description : The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole)  (A) has q -axis current only (B) has d -axis current only (C) has both d and q axis currents (D) cannot be divided between q and d axis currents

Last Answer : The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole) has d -axis current only

Slip test is performed to determine : (A) Slip in an induction motor vtkgi Xd and Xq in a salient pole alternator

Description : Slip test is performed to determine :  (A) Slip in an induction motor  (B) Xd and Xq in a salient pole alternator  (C) Synchronous impedance in an alternator  (D) Positive and negative sequence impedances of an alternator

Last Answer : Slip test is performed to determine :  Xd and Xq in a salient pole alternator 

The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and

Description : The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is (A) 0.25 pu (B) 0.5 pu (C) 1.0 pu (D) 1.5 pu

Last Answer : The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is 0.5 pu

The power factor angle and torque angle of a salient pole synchronous generator drawing a current of 1.0 pu

Description : The power factor angle and torque angle of a salient pole synchronous generator drawing a current of 1.0 pu from a lagging load are 45o and 15o, respectively. The direct axis and quadrature axis currents, respectively, are (A) 0.5 pu ... pu, 0.5 pu (C) 0.707 pu, 0.707 pu (D) 0.5 pu, 0.5 pu

Last Answer : The power factor angle and torque angle of a salient pole synchronous generator drawing a current of 1.0 pu from a lagging load are 45o and 15o, respectively. The direct axis and quadrature axis currents, respectively, are 0.866 pu, 0.5 pu

If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will?

Last Answer : If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will stop.

Salient pole rotor is use for which speed?

Description : Salient pole rotor is use for which speed?

Last Answer : Salient pole rotor is use for low and medium speed prime movers.

what will happen when excitation of an unloaded salient pole synchronous motor suddenly gets disconnected?

Description : what will happen when excitation of an unloaded salient pole synchronous motor suddenly gets disconnected?

Last Answer : When excitation of an unloaded salient pole synchronous motor suddenly gets disconnected the motor will stop.

What generator characteristics must be considered when alternators are synchronized for parallel operation?

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Last Answer : Output voltage, frequency, and phase relationships.

How is output voltage controlled in practical alternators?

Description : How is output voltage controlled in practical alternators?

Last Answer : By varying the voltage applied to the field windings.

In single-phase alternators, in order for the voltages induced in all the armature windings to add together for a single output, how must the windings be connected?

Description : In single-phase alternators, in order for the voltages induced in all the armature windings to add together for a single output, how must the windings be connected?

Last Answer : In series.

How are alternators usually rated?

Description : How are alternators usually rated?

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Most large alternators have a small dc generator built into them. What is its purpose?

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A 6 pole 3-phase wound-rotor induction machine is driven by another machine at 1800 rpm. The rotor of the ...

Description : A 6 pole 3-phase wound-rotor induction machine is driven by another machine at 1800 rpm. The rotor of the induction machine is connected to a 50Hz system. If the mechanical rotation of the rotor is in the same direction as the rotor winding flux rotation, then frequency of the stator voltage will be

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