# what is firing angle?

what is firing angle?

Firing angle is the angle at which the sin angle is delaying to start the waveform.

Firing angle is time in electrical degrees from the instant the valve voltage is positive to the application of firing pulse to the valve (start of conduction). Also called delay angle.

## Related questions

Description : What is meant by firing angle of thyristor?

Answer : The point at which SCR is triggered is known as firings angle of thyristor.

Description : Define: i) Firing angle ii) Conduction angle

Answer : (i) Conduction Angle (β): Conduction angle is defined as the angle between the instant the SCR is triggered or turned on and the instant at which the SCR is turned off. Assuming that the SCR ... maximum average output voltage to the angle when the SCR is actually triggered or fired by gate pulse.

Description : When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is

Answer : When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is √3/2

Description : What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value ?

Answer : 90° will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value.

Description : What is the maximum value of torque angle in synchronous motor?

Answer : The maximum value of torque angle in synchronous motor is 90 degrees electrical.

Description : What is power factor angle?

Description : Explain the concept of lagging and leading phase angle by waveform.

Answer : i) Leading phase angle :  When two ac quantities of same frequency do not attain their respective zero or peak values simultaneously, then the quantities are said to be out-of-phase quantities. The ... Similarly, in the second diagram, the voltage is said to be lagging the current by  Φ.

Description : How to find total impedance Z, current I and Impedance angle ?

Answer : How to find total impedance Z, current I and Impedance angle ?

Description : Phase margin is the amount of angle to make the system  (1) Oscillatory (2) Stable (3) Unstable (4) Exponential

Answer : Phase margin is the amount of angle to make the system Unstable

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

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

Description : Torque angle for the synchronous machine is the angle between (A) stator magnetic field and rotor magnetic field (B) stator magnetic field and net magnetic field in the air gap (C) rotor magnetic field and net magnetic field in the air gap (D) excitation voltage and impedance voltage drop

Answer : Torque angle for the synchronous machine is the angle between rotor magnetic field and net magnetic field in the air gap

Description : The product of apparent power and cosine of the phase angle between circuit voltage and current is?

Answer : In parllpar reasonans RLC circuit the current is

Description : The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of______degrees.

Answer : The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of 45 degrees.

Description : Two waves of the same frequency have opposite phase when the phase angle between them is?

Answer : Two waves of the same frequency have opposite phase when the phase angle between them is 180°.

Description : Tangent of angle of friction is equal to?

Answer : Tangent of angle of friction is equal to coefficient of friction.

Description : Angle of friction is the?

Answer : Angle of friction is the angle between normal reaction and the resultant of normal reaction and the limiting friction.

Answer : If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is 10°.

Answer : The coupling angle or load angle of synchronous motor is defined as the angle between the rotor and the stator poles of opposite polarity.

Description : The synchronous motor will develop maximum power when the load angle is?

Answer : The synchronous motor will develop maximum power when the load angle is 900.

Description : In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load, the input source current is (A) sinusoidal current (B) constant dc current (C) continuous rectangular pulses (D) alternating rectangular pulses

Answer : In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load, the input source current is alternating rectangular pulses

Description : Regenerative breaking of ac-dc converter fed dc motor is possible when firing delay angle of SCRs is (A) 30° (B) 60° (C ) 90° (D) 120°

Description : A separately excited d.c. motor fed from single phase full converter with firing angle 60° runs at 1000 r.p.m. If motor is connected to single phase semiconverter with the same firing angle of 60°, it would run at (a) 2000 rpm (b) 1850 rpm (c) 1500 rpm (d) 1000 rpm

Description : A single-phase fully controlled thyristor bridge ac-dc converter is operating at a firing angle of 25o and an overlap angle of 10o with constant dc output current of 20 A. The fundamental power factor (displacement factor) at input ac mains is  (A) 0.78 (B) 0.827 (C) 0.866 (D) 0.9

Answer : A single-phase fully controlled thyristor bridge ac-dc converter is operating at a firing angle of 25o and an overlap angle of 10o with constant dc output current of 20 A. The fundamental power factor (displacement factor) at input ac mains is 0.78

Description : In static Kramer drive, motor turns ratio is 0.6, the firing angle is 120o. The motor slip is   (a) 0.633 (b) 0.533 (c) 0.833 (d) 0.733

Answer : In static Kramer drive, motor turns ratio is 0.6, the firing angle is 120o. The motor slip is 0.833

Description : A single phase fully controlled thyristor bridge ac -dc converter is operating at a firing angle of 25 degree and an overlap angle 10 degree with constant dc output current of 20A. The fundamental power factor (displacement factor) at input ac mains is : (A) 0.78 (B) 0.827 (C) 0.866 (0) 0.9

Answer :  If firing angle in SCR increases, output is Decreases

Description : After firing as SCR, the gating pulse is removed. The current in the SCR will  1. remain the same 2. immediately fall to zero 3. rise up 4. None

Answer : After firing as SCR, the gating pulse is removed. The current in the SCR will remain the same

Description : Select firing order for 4 – Cylinder engine with justification.

Answer : Firing orders for 4 cylinder engine: 1-3-4-2 The firing order must be considered on the basis of engine vibrations and engine cooling. Also the firing order affects the balancing of engine ... sufficient travel time to exhaust gases. So that development of high back pressure would be avoided.

Description : State the common firing orders used in 4 cylinder engine.

Answer : Firing order: The sequence in which the power impulses occur in an engine is called the firing order. Firing order for 4 cylinder engine.(Any one) 1-3-4-2 OR 1-2-4-3 OR 1-4-3-2

Description : Do you have the stomach to fire people? Have you had experience firing many people?

Answer : TRAPS: This innocent question could be a trap door which sends you down a chute and lands you in a heap of dust outside the front door. Why? Because its real intent is not just to see if ... s better for all concerned to act decisively in getting rid of offenders who won't change their ways.

Description : Why does a cannon recoil after firing ? (1) Conservation of energy (2) Backward thrust of gases produced (3) Newton’s third law of motion (4) Newton’s first law of motion

Answer : Newton’s third law of motion

Description : A bullet is fired from a rifle which recoils after firing. The ratio of kinetic energy of the rifle to that of the bullet is (1) zero (2) one (3) less than one (4) more than one

Description : What is meant by local attraction? How will you suspect local attraction at the field ? state its effect on included angle.

Answer : Local attraction: It is the deviation or deflection of magnetic needle from its normal position under influence of external magnetic forces is called as local attraction. Suspect of local attraction ... The needle is affected by local attraction therefore it does not give a corrected angle

Description : A projectile is fired into the air at an angle of 23 degrees. At what other angle would this projectile have the same range if air resistance is neglected? w) 46 degrees x) 60 degrees y) 67 degrees z) 68 degrees

Description : A stone weighing 10 Newtons is sitting on the side of a hill that is at a 30o angle with the horizontal. What is the magnitude of the component of the stone's weight parallel to the side of the hill.

Description : Assume a ray of light is incident on a smooth reflecting surface at an angle of incidence of 15 degrees to the normal. What is the angle between the incident ray and the reflected ray?

Description : What bond angle is associated with sp3 (read: S - P - hybrid orbitals?

Description : What bond angle is associated with sp2 hybrid orbital

Description : What bond angle is associated with sp hybrid orbitals

Description : 1. Whose prior consent can the Money Bills be introduced in the State Legislature? 2. If one wants to throw a cricket ball to the maximum distance, then at which angle should he throw it ? ... world's best cod-fishing ground? 20. In which century did the famous Chinese pilgrim Fahien visit India?

Answer : Answer : 1. Governor 2. 45° 3. Production and income methods 4. Chaitra 5. Khudai Khidmatgars 6. Sri Lanka 7. Natural experiment 8. Kerala High Court 9. Coriolis force 10. Lord Buddha 11. ... groundnut 17. R. K. Shanmukham Chetty 18. Temperature inversions 19. North-east Atlantic 20. 5th century AD

Description : Consider a triangle A(0, 0), B(1, 1), C(5, 2). The triangle has to be rotated by an angle of 450 about the point P(-1, -1). What shall be the coordinates of the new triangle? (A) A'=(1, √2-1), B'=(-1, 2√2-1), C'=(3√2-1, ... 3√2-1, (9/2)√2-1) (D) A'=(√2-1, -1), B'=(-1, 2√2-1), C'=(3√2-1, (9/2)√2-1)

Answer : (C) A'=(-1, √2-1), B'=(-1, 2√2-1), C'=(3√2-1, (9/2)√2-1)

Description : Consider a unit square centred at origin. The coordinates of the square are translated by a factor (1/2, 1) and rotated by an angle of 90o . What shall be the coordinates of the new square ? (A) (-1/2, 0), (-1/2, 1), (-3/2, 1), (-3/2, ... , 1), (-3/2, 0) (D) (-1/2, 0), (1/2, 1), (-3/2, 1), (-3/2, 0)

Answer : (A) (-1/2, 0), (-1/2, 1), (-3/2, 1), (-3/2, 0)

Description : What is the angle between instantaneous displacement and acceleration during the retarded motion  (a) Zero (b) π/4 (c) π/2. (d) π.

Description : What is the power factor of a cable of loss angle “ө”?  (A) sin ө (B) cos ө (C) tan ө (D) Independent of ө

Description : What happens to the angle between current and voltage, when a small capacitance is added in series with a highly inductive circuit?  (A) Increases (B) Remains same as earlier angle (C) Decreases (D) Becomes indeterminant

Description : Define: (i) Trail , (ii) Caster angle

Answer : i) Trail: Trail refers to distance between imaginary point where the steering axis intersect the ground and the centre of tyre contact point. Measured length between the imaginary point and centre of front tyre ... in the plane of the wheel is called the caster angle. It ranges from 20 to 80.

Description : Write type of chip formed with following factors. (i) High rake angle (ii) High cutting speed (iii) Small depth of cut (iv) Low cutting speed (v) Large depth of cut (vi) Low rake angle

Answer : (i) High rake angle : Continuous chips (ii) High cutting speed : Continuous chips (iii) Small depth of cut : Continuous chips (iv) Low cutting speed :Continuous chips with built up edge (v) ... cut : Continuous chips with built up edge (vi) Low rake angle :Continuous chips with built up edge

Description : With neat sketch, explain the included angle method of plotting compass traverse.

Answer : 1. Calculate all included angles of the traverse from observed bearings of the lines. e.g. <A, <B, <C, <D, <E  2. Check sum of included angles as equal to ( ... coincide with starting station (in case of closed traverse). If there is closing error, it needs to be corrected.

Description : Driving force can be increased by: (A) Decrease in amount of material on slope (B) Increase in slope angle (C) Decrease in slope angle (D) None of these

Answer : (B) Increase in slope angle

Description : _______ is the angle of a fault plane w.r.t. vertical. (A) Hade (B) Throw (C) Heave (D) Dip