# Which alternator will have more number of poles ?

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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

## Related questions

In a hydel power station, the number of poles of an alternator is 24. At what rpm the alternator must be driven to produce 50 Hz voltage?

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

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

The number of poles in a phase induction motor at 50 Hz and running at 1500 rpm will be?

A permanent magnet stepper motor with 8 poles in stator and 6 poles in rotor will have a step angle of (a) 7.5° (b) 15° (c) 30° (d) 60°

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: A) 1000 rpm B) 920 rpm C) 950 rpm D) 970 rpm

At which power factor alternator is said to be overexcited?

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

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

Is the speed of alternator is directly proportional to frequency?

The power factor of an alternator depends on?

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

Which have more free electrons: conductors or insulators?

Which motor have more efficiency, synchronous motor or induction motor?

The substances which have a large number of free electrons and offer a low resistance are called?

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

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

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

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.

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

In alternator where the voltage drop occurs?

which of the following induction motor will have the least shaft diameter? (a) 20 HP, 2880 rpm (b) 20 HP, 1440 rpm (c) 20 HP, 960 rpm (d) 20 HP, 730 rpm

In root locus plot, a point on the real axis lies on the locus, if the number of open loop poles plus zeros on real axis to the a) left of the point is odd b) left of the point is even . c) right of the pointis odd d) right of the point is even

The number of poles of 8/6 stepper motor can be :

An 1.8° step, 4 -phase stepper motor has 40 teeth on 8 poles of the stator. The number of rotor teeth for their rotor will be: (A) 40 (B) 50 (C) 100 (D) 80

A 50 Hz, 3—phase induction motor has a full load speed of 1440 rpm. The number of poles of the motor is:   (A)4 (8)6 (0)12  (D)8

For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f. ?

When the stator windings are connected in such a fashion that the number of poles are made half, the speed of the rotor of a synchronous motor?

lf the wire which is vertical to this page has electron flow downwards the conductor will have

The number of electrical degrees ‘passed through’ in one revolution of a 6-pole synchronous alternator is: A) 360 degree B) 720 degree C) 1080 degree D) 2160 degree

lf the poles of system are lying on the imaginary axis in s-plane, then the system will be

When the north poles of two bar magnets are brought close together, there will be: A. no force B. a downward force C. a force of attraction D. a force of repulsion

The driving point impedance with poles at ω = 0(zero) and ω = ∞ (infinity) must have the  (a) s term in the denominator and an excess term in the numerator (b) s term in the numerator and an excess term in the denominator (c) s term in the numerator and equal number of terms in the numerator and denominator (d) s term in the denominator and equal number of terms in the numerator and denominator

The phase sequence of a three-phase alternator will reverse if  A) The field current is reversed keeping the direction of rotation same. B) The field current remains the same but the direction of rotation is reversed C) The field current is reversed and also the direction of rotation is reversed D) None of the above

In river crossing, hilly terrain, modern HV lines have span more than (a) 50 m (c) 500 m (b) 100 m (d) 800 m

Salient pole rotor is use for which speed?

Which rotor is use for high speed in turbo alternators?

Which of the following is a group of one or more attributes that uniquely identifies a row?  (1) Key (2) Tuple (3) Determinant (4) Relation

Which of the following test is carried out to ensure the sufficient strength of insulation between two or more conductors to avoid leakage between them ?   (a) Testing of insulation resistance between wiring and earth (b) Testing of insulation resistance between conductors (c) Testing of polarity of single phase switch (d) Testing of earth continuity path

Which portion of the transmission system is more prone to faults ?   (a) Alternator (b) Transformer (c) Overhead lines (d) Underground cables

The noise is more dominant in which of the following:  (1) PAM (2) PWM (3) PPM (4) FSK

A network which contains one or more than one source of e.m.f. is known as?

For a NAND gate, when one or more inputs are low then the output will be A) Low B) High C) Alternately high and low D) High or low depending on relative magnitude of inputs