Description : what is DIAC?
Answer : DIAC is a two terminal and four layer device most DIAC have three terminals. DIAC stands for diode for alternating current. It conducts in both direction. It is also used for triggering triac.
Description : Draw symbol & V-I characteristics of (i) LASCR (ii) DIAC (iii) TRIAC
Answer : (i) LASCR: (ii) DIAC: (iii) TRIAC:
Description : Describe triggering circuit for TRIAC using DIAC.
Answer : Triggering circuit for TRIAC using DIAC: DIAC stands for diode alternating current. It's a two terminal four layer bidirectional device. It conducts in both directions. DIAC is used for triggering TRIAC. ... of DIAC to the gate terminal of TRIAC reduces the harmonics.
Description : Explain the need and steps to conduct the reduced voltage running up test on the three phase induction motor.
Answer : The direction of rotation of a D.C. series motor can be changed by interchanging field terminals.
Answer : The direction of rotation of universal motor can be reversed the by reversing the flow of current through either armature winding or field winding.
Answer : Direction of rotation of a split phase motor can be reversed by reversing the connection of either running winding or starting winding.
Description : How can we reverse the direction of rotation of synchronous motor?
Answer : By reversing supply phase sequence we can reverse the direction of rotation of synchronous motor.
Description : In a single-phase induction motor, the operating direction is determined by the ________ A) Rotor B) Stator C) Starting circuit D) None of these
Answer : In a single-phase induction motor, the operating direction is determined by the Starting circuit
Description : What happens when you reverse the direction of the current in an electromagnet?
Answer : When you reverse current direction in an electromagnet, the magnetic poles will also change.
Description : What is the direction of flow of electric current in an electric circuit?
Answer : It flows from anode to cathode (direction of holes flow)
Description : why current flows in opposite direction of electrons?
Answer : Hi team, the current flow is nothing but flow of electrons But the conventional direction I'd opposite to actual current flow . ..
Description : How does AC current change direction?
Answer : This is because the angle at which the magnetic fields cuts across a winding changes its poles thus current has to change dirention .
Description : What is the direction of the induced electric field?
Answer : It is in opposite direction to the one that produced it.
Description : What is the direction of an AC current?
Answer : The magnitude and direction of alternating current is changes with respect to time. So for half cycle it is positive and for next half cycle it is negative.
Description : What is the direction of the induced current?
Description : What is the direction of the electric field?
Answer : Electric field is at right angle widh flow of current (right hand rule).
Description : What is the direction of flow of current?
Answer : Current flows from anode to cathode(opposite direction to flow of electrons)
Description : What is the direction of the flow of electrons?
Answer : Electrons flow cathode to anode or in an oposite direction of convection current flow or holes.
Description : What is the direction of the conventional current flow?
Answer : The conventional current flow in opposite direction of flow of electrons. The electrons flow from negative terminal of battery to positive terminal of battery. And conventional current flow from positive terminal of battery to negative terminal of battery.
Description : In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation, the machine is operating as (1) synchronous motor (2) synchronous generator (3) asynchronous motor (4) asynchronous generator
Answer : In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation, the machine is operating as synchronous generator
Description : Two non-collinear parallel equal forces acting in opposite direction?
Answer : Two non-collinear parallel equal forces acting in opposite direction constitute a couple.
Answer : In case of a shaded pole motor the direction of rotation of the motor is from main pole to shaded pole.
Answer : In repulsion motor direction of rotation of motor is the same as that of brush shift.
Description : The direction of rotation of an inverter fed 3-phase ac motor is reversed by (A) a mechanical reversing switch (B) reversing the input dc link voltage (C) operating the inverter as a rectifier (D) changing the sequence of switching
Answer : The direction of rotation of an inverter fed 3-phase ac motor is reversed by changing the sequence of switching
Answer : The direction of rotation of an hysteresis motor is determined by position of shaded pole with respect to main pole.
Description : What is the direction of flow when charging a capacitor?
Answer : Thyristor conducts when the anode voltage is greater than cathode and when the current provided to Gate.
Answer : Diode conducts when the anode voltage is greater than the cathode voltage.
Description : The -------can conduct current in either direction and is turned-on when the breakover voltage is exceeded A) SCR B) Diac C) SCS D) Traic
Answer : The diac can conduct current in either direction and is turned-on when the breakover voltage is exceeded.
Description : Which one of the following can truthfully be said of non-school, active agencies of social interaction? Options: A) The less education people have, the more they use established recreational ... has proved undesirable D) The community council should conduct activities, not just to co-ordinate them
Answer : B) The largest items of the expenditure for leisure time activities are for those of a passive nature
Description : TRIAC is an ac switch which can be made to conduct on
Answer : TRIAC is an ac switch which can be made to conduct on both half cycle of AC voltage.
Description : DIAC DIAC DIAC
Answer : A Diac is an AC switch
Description : A positive sloped supply curve for a product represents (a) Supply will move with movement in the price in the opposite direction; (b) Supply will move with the movement in the price in the same direction; (c) Both ; (d) None
Answer : (b) Supply will move with the movement in the price in the same direction;
Description : If there is to be a change in velocity, there MUST be a change in w) speed only x) direction only y) either speed or direction z) both speed and direction
Answer : ANSWER: Y -- EITHER SPEED OR DIRECTION
Description : When a charge moves through an electric circuit in the direction of an electric force it does one of the following four things. Does it: w) lose potential energy and gain kinetic energy x) ... lose kinetic energy y) lose both potential and kinetic energy z) gain both potential and kinetic energy
Answer : ANSWER: W -- LOSE POTENTIAL ENERGY AND GAIN KINETIC ENERGY
Description : A Superfast train overtakes two persons walking along a railway track. The first one walks at 9 km/hr. The other one walks at 10.8 km/hr. The train needs 16.8and 17seconds respectively to overtake them. ... are walking in the same direction as the train? A) 250 kmph B) 487kmph C) 162kmph D) 312kmph
Answer : ANSWER:C Explanation: Given that the first one walks at 9 km/hr convert the speed in the unit of m/sec 9 km/hr = (9*5/18) m/s = 5/2 m/s = 2.5 m/s Another one walks at 10.8 km/hr ... the speed in the unit of km/hr Speed of the train = (45*18/5)kmph Speed of the train = 162 km/ hr
Description : A train overtakes two girls walking along a railway track. The first girl walks at 9 km/hr. The other girl walks at 10.8 km/hr. The train needs 16.8 and 17 seconds respectively to overtake them. What is the speed of the ... in the same direction as the train? A) 25 m/s B) 45 m/s C) 30m/s D) 40m/s
Answer : ANSWER:B Explanation: First girl speed = 9km/hr = 9 * 5 / 18 m/s = 5/2 m/s = 2.5 m/s second girl speed = 10.8 km/hr = 10.8 * 5/18 m/s = 54/18 = 3 m/s Let the speed of the train ... x - 3) * 17 16.8x - 42 = 17x - 51 0.2x = 9 x = 45 Therefore the speed of the train is 45 m/s
Description : Two vectors are said to be equal if (1) only their magnitudes are same (2) only their directions are same (3) both magnitude and direction are same (4) magnitudes are same but directions are opposite
Answer : both magnitude and direction are same
Description : The direction of inducted e.m.f. can be found with the help of (a) Fleming’s right hand rule (b) Kirchhoff’s voltage law (c) Lenz’s law (d) Laplace’s law
Description : Direction of rotation of three phase induction motor can be reversed by (a) interchanging connections of any two phases (b) disconnecting any one phase (c) (a) and (b) both (d) None of the above
Answer : The direction of rotation of 3-phase induction motor is reversed by Changing the phase sequence of supply. OR The direction of rotation of 3-phase induction motor is reversed by inter-changing any two phase connections of motor terminals with supply terminals.
Description : how can we reverse the direction of rotation of three phase induction motor ?
Answer : The direction of rotation of three phase induction motor can be reversed by plugging i.e by changing any two out of three phases of the supply to the stator of the Induction motor terminal.
Description : Diamond has each of the following properties except: w) extreme hardness x) ability to conduct electricity y) high melting point z) tendency to burn in air
Answer : ANSWER: X -- ABILITY TO CONDUCT ELECTRICITY
Description : The purpose of value education is best served by focusing on (A) Cultural practices prevailing in the society. (B) Norms of conduct laid down by a social group (C) Concern for human values (D) Religious and moral practices and instructions.
Answer : (C) Concern for human values
Description : Most of the Universities in India (A) conduct teaching and research only (B) affiliate colleges and conduct examinations (C) conduct teaching/research and examinations (D) promote research only
Answer : Answer: C Most of the Universities in India conduct teaching/research and examinations.
Description : 1. With which India's progress has been reasonably satisfactory in connection? 2. Critical criteria for the location of an aluminium plant in India are the availability of which things? 3. From which ... . What is the mean of Epigraphy? 20. Entamoeba histolytica is found in which part of man?
Answer : Answer : 1. Growth of GNP 2. Bauxite and electricity 3. Central Asia 4. Above 80 dB 5. State Election Commission 6. Copper 7. Centigrade 8. Divyavadana 9. Chennai 10. Henry Ford 11. Physalia 12. Argon ... . 6.2 1018 16. Taxation 17. Punjab 18. Krishna-I 19. The study of inscriptions 20. Intestine
Description : Diamond does not conduct electricity, because (1) It’s structure is very compact (2) It is of crystalline nature (3) There are only carbon atoms present in it (4) No free electrons are present in it
Answer : No free electrons are present in it
Description : The etymological meaning of the word logic is A) the science of mind B) the science of thought C) the science of conduct D) the science of beautyody .
Answer : B) the science of thought