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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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0 answers 32 views

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?

asked Apr 3, 2018 in Lesson 2 Generation, Transmission and Distribution of Electric Power an Overview by Shimroz123
1 answer 39 views

 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

asked Jun 4, 2018 in Alternator by Shimroz123
1 answer 34 views

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

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 16 views

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

asked Mar 26, 2018 in Induction Machine by Shimroz123
1 answer 24 views

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°

asked Apr 25, 2018 in Electrical Engineering by Shimroz123
1 answer 42 views

 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

asked Jun 4, 2018 in Alternator by Shimroz123
1 answer 18 views

At which power factor alternator is said to be overexcited?

asked Mar 18, 2018 in Alternator 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 40 views

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

asked May 17, 2018 in Alternator by Shimroz123
1 answer 31 views

Is the speed of alternator is directly proportional to frequency?

asked Mar 18, 2018 in Alternator by Shimroz123
1 answer 24 views

The power factor of an alternator depends on?

asked Mar 18, 2018 in Alternator by Shimroz123
1 answer 63 views

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

asked Mar 18, 2018 in Alternator by Shimroz123
1 answer 16 views

Which have more free electrons: conductors or insulators? 

asked Jul 1 by Zeeshan
1 answer 28 views

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

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 20 views

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

asked Mar 25, 2018 in Basic concepts by Shimroz123
1 answer 52 views

 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 

asked Jun 4, 2018 in Alternator by Shimroz123
1 answer 14 views

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

asked May 22, 2018 in Alternator by Shimroz123
1 answer 51 views

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

asked May 15, 2018 in Alternator by Shimroz123
1 answer 40 views

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.

asked May 14, 2018 in Alternator by Shimroz123
1 answer 44 views

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

asked Mar 18, 2018 in Alternator by Shimroz123
1 answer 31 views

In alternator where the voltage drop occurs?

asked Mar 18, 2018 in Alternator by Shimroz123
1 answer 21 views

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

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

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

asked May 23, 2018 in Control System by Shimroz123
1 answer 18 views

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

asked Apr 30, 2018 in Electrical Machine by Shimroz123
1 answer 123 views

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

asked Apr 11, 2018 in Computer Engineering by Shimroz123
0 answers 15 views

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

asked Apr 9, 2018 in Electrical Engineering by Shimroz123
1 answer 17 views

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. ?

asked Mar 20, 2018 in DC generator by Shimroz123
1 answer 19 views

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?

asked Mar 20, 2018 in Synchronous machine by Shimroz123
1 answer 18 views

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

asked Apr 26, 2018 in Electrical Engineering by Shimroz123
1 answer 28 views

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

asked Jun 17, 2018 in Synchronous machine by Shimroz123
1 answer 21 views

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

asked Apr 26, 2018 in Control System by Shimroz123
1 answer 15 views

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

asked Apr 12, 2018 in Electrical Engineering by Shimroz123
1 answer 12 views

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

asked May 16, 2018 in Control System by Shimroz123
1 answer 19 views

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

asked Apr 9, 2018 in Electrical Machine by Zeeshan
0 answers 804 views

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

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
1 answer 27 views

Salient pole rotor is use for which speed?

asked Mar 18, 2018 in Alternator by Shimroz123
1 answer 19 views

Which rotor is use for high speed in turbo alternators?

asked Mar 18, 2018 in Alternator by Shimroz123
0 answers 20 views

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

asked Apr 10, 2018 in Computer Engineering by Shimroz123
0 answers 18 views

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 

asked Apr 10, 2018 in Electrical Engineering by Shimroz123
0 answers 44 views

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

asked Apr 10, 2018 in Electrical Engineering by Shimroz123
1 answer 12 views

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

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
2 answers 29 views

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

asked Mar 25, 2018 in Network Analysis by Shimroz123
1 answer 7 views

 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 

asked Jun 17, 2018 in Digital Electronics by Shimroz123
0 answers 24 views

An alternator is feeding an infinite bus bar. Its prime mover is suddenly shut down. The alternator will:  (A) Continue to work as alternator but the direction of rotation will reverse. (B) Come to stand still. (C) Continue to work as synchronous motor and direction of rotation will also be same. (D) Will work as an induction motor.

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
0 answers 22 views

If both the number of turns and core length of an inductive coil are doubled, then its self inductance will be (a) halved (b) doubled (c) quadrupled (d) unaffected

asked May 25, 2018 in Inductance by Shimroz123
1 answer 67 views

The number of chords in the graph of the given circuit will be

asked May 20, 2018 in Network Analysis by Shimroz123

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