Explain three phase half wave controller or three phase unidirectional controller.
Last Answer : Three phase half wave controller or unidirectional controller:
Show More
239 views
1 answer
asked
Mar 8, 2018
by
anonymous

Explain Three Phase Bidirectional Delta Connected Controller.
Last Answer : Three Phase Bidirectional Delta Connected Controller:
Show More
483 views
1 answer
asked
Mar 7, 2018
by
anonymous
.jpg)
Draw single phase full wave mid-point converter for inductive load. Draw input and output waveforms for it.
Last Answer : Circuit Diagram: Waveforms:
Show More
536 views
1 answer
asked
May 21, 2020
by
anonymous

Give the operation of single phase full wave bridge controlled converter with RL load with a neat diagram. Also draw its waveform.
Last Answer : Single phase fully control bridge converter with RL load: 1. During positive half cycle of input voltage, T1 and T2 are forward biased and during negative half cycle, T3 and T4 are forward biased. Therefore, T1-T2 ... cycle till the firing of next pair of SCRs as shown in the waveform.
Show More
886 views
1 answer
asked
Jul 25, 2019
by
anonymous

List different starting methods of three phase synchronous motor. Explain any one of them.
Last Answer : Different Starting Methods of Three Phase Synchronous Motor: As synchronous motor is not self starting, different methods of starting are as follows: 1) By using an Induction (Pony) motor 2) ... . The rotor gets pulled into synchronism and starts running at constant speed as a synchronous motor.
Show More
158 views
1 answer
asked
May 7, 2020
by
anonymous

Explain the need and steps to conduct the reduced voltage running up test on the three phase induction motor.
Show More
219 views
0 answers
asked
Apr 16, 2020
by
anonymous

Explain the principle of ON-OFF control and phase control of AC voltage controller with suitable circuit and waveforms.
Last Answer : The integral cycle control (on-off control) and phase angle control are the two types of AC voltage controller. The principle of ON-OFF control: The on-off control is also called an integral cycle ... control. In phase control, the switch is on for some period of each cycle.
Show More
3.5k views
1 answer
asked
Feb 14, 2018
by
anonymous

Explain full wave bridged rectifier with the help of circuit diagram and input output waveform.
Last Answer : 1. In positive half cycle (0 to Π): The end A of the secondary winding becomes positive and end B negative. This makes diode D1 and D4 forward biased while diode D2 and D3 are reverse biased. These two diodes will ... D2 and D3 when it is conducting is as follows. B - D2 - RL - D3 - A
Show More
162 views
1 answer
asked
Sep 5, 2018
by
anonymous
.jpg)
Explain three phase bridge inverter.
Last Answer : Three phase bridge inverter: Three phase bridge inverter converts DC voltage input to three-phase variable frequency variable voltage output. DC voltage source can be a DC source or output of the rectifier. ... in proper sequence. The switch may be thyristor or IGBT etc.
Show More
470 views
1 answer
asked
Feb 19, 2018
by
anonymous

Describe the gate circuit for a single phase full converter.
Show More
71 views
0 answers
asked
Mar 11, 2018
by
anonymous
.jpg)
single phase full converter
Last Answer : single phase full converter
Show More
121 views
1 answer
asked
Nov 16, 2017
by
anonymous

three phase to single phase cycloconverter
Last Answer : three phase to single phase cycloconverter
Show More
514 views
1 answer
asked
Nov 16, 2017
by
anonymous

Explain with neat circuit diagrams the procedures to perform no load and blocked rotor tests on three phase induction motor.
Show More
131 views
0 answers
asked
Apr 16, 2020
by
anonymous

Explain power relations in three phase circuit.
Show More
88 views
0 answers
asked
Mar 11, 2018
by
anonymous

Is it possible for a soil to consist only of one phase?
Show More
1 view
0 answers

What is the operation of three phase induction motor
Show More
6 views
0 answers

THREE PHASE INDUCTION MOTORS MCQ
Last Answer : 101. Insertion of resistance in the stator of an induction motor (a) increases the load torque (b) decreases the starting torque (c) increases the starting torque (d) none of the above Ans: b
Show More
323 views
3 answers

Why is a capacitor used in a single phase motor and not in three phase motor ?
Last Answer : In 1-phase induction motor capacitor work is generate the auxiliary winding current than excite the main winding to rotor starts rotate. After rotor start rotating about 75% of their speed than auxiliary ... emf to start the motor.so,in 3-phase induction motor is self start induction motor.
Show More
261 views
6 answers
asked
Sep 2, 2019
by
anonymous

Why is a three phase denoted by R, Y, B ?
Last Answer : phase 1 ,R =Red colour cable terminal, phase 2 Y=Yellow colour terminal cable,Phase 3 B=Blue colour cable terminal, N =Neutral. For identification.
Show More
250 views
2 answers
asked
Aug 18, 2019
by
anonymous
.jpg)
State any four advantages of three phase induction motor.
Last Answer : Advantages of three phase induction motor https://youtu.be/27OIOCKN05U
Show More
137 views
2 answers
asked
Jul 30, 2019
by
anonymous

Define balanced and unbalanced load in three phase circuit.
Last Answer : Balanced Load: When all the imedances of 3 phases are equal in magnitude and of same nature then load is said to be balanced. Unbalanced Load: When all the imedances of 3 phases are not equal in magnitude and of different nature then load is said to be unbalanced.
Show More
257 views
1 answer
asked
Sep 6, 2018
by
anonymous

State any four applications of three phase circuits.
Last Answer : The application of three phase circuits are 1. Three phase circuit is used for power transmission over long distances. 2. Three phase circuit can produce rotating magnetic field 3. Three phase ... three phase Motors and Transformers. 4. Three phase circuit is used for power converters circuits.
Show More
248 views
1 answer
asked
Aug 12, 2018
by
anonymous

Draw the waveform of three phase AC supply voltage.
Show More
212 views
0 answers
asked
Aug 11, 2018
by
anonymous

State advantages of three phase over single phase.
Last Answer : Advantages of 3-phase system over 1-phase system: - 1. More output: For the same size, output of poly-phase machines is always higher than single phase machines. 2. Smaller size: For ... are self- starting: The three phase ac motors are self starting, while single phase induction motor are not.
Show More
2.9k views
4 answers
asked
Aug 11, 2018
by
anonymous
.jpg)
The slip of 400 V, three phase, 4 -pole induction motor when rotating at 1440 rpm is
Last Answer : The slip of 400 V, three phase, 4 -pole induction motor when rotating at 1440 rpm is 4 percent
Show More
362 views
1 answer
asked
Apr 29, 2018
by
anonymous

When a V-V three phase transformer system is converted into a Δ-Δ system, increase in capacity of the system is (A) 86.6% (B) 50% (C) 57.7% (D) 73.2%
Last Answer : When a V-V three phase transformer system is converted into a Δ-Δ system, increase in capacity of the system is 73.2%
Show More
132 views
1 answer
asked
Apr 28, 2018
by
anonymous

In a three-phase supply floating neutral is undesirable because it way give rise to?
Last Answer : In a three-phase supply floating neutral is undesirable because it way give rise to unequal line voltages across the load.
Show More
116 views
1 answer
asked
Mar 25, 2018
by
anonymous

Three phase synchronous motor will have how many sliprings?
Last Answer : Three phase synchronous motor will have two sliprings.
Show More
95 views
1 answer
asked
Mar 18, 2018
by
anonymous

How is a three phase cage induction motor self starting?
Last Answer : Any type of induction motor is self starting. Because the reason for torqe production require two flux displaced by some angle theta.If theta is constant with time then torqe will be constant;if ... torqe also pulsating. In induction motor this angle theta is not pulsating.so it is self starting
Show More
159 views
1 answer
asked
Mar 17, 2018
by
anonymous

What is mean by plugging in three phase induction motor?
Last Answer : Plugging in three-phase induction motor means interchanging of any two phases of a stator for quick stopping.
Show More
153 views
1 answer
asked
Mar 3, 2018
by
anonymous
.jpg)
What is a three phase connection?
Last Answer : RYB, 440 volt/phase
Show More
132 views
1 answer
asked
Dec 22, 2017
by
anonymous

how can we reverse the direction of rotation of three phase induction motor ?
Last 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.
Show More
137 views
1 answer
asked
Oct 4, 2017
by
anonymous

Explain MCB and ELCB with connection diagram supplying single phase load.
Last Answer : OR OR Explanation: * MCB provides short circuit protection. * MCB provides overload protection * ELCB provides earth fault protection. * MCB is in series with ... occurs, the ELCB cuts off the power within the time of 0.1 sec. automatically to protect the personnel.
Show More
582 views
1 answer
asked
May 7, 2020
by
anonymous
.jpg)
Draw & explain operation of phase detector.
Last Answer : In phase detector, the op-Amp basically acts as a zero crossing detector. If a sine wave is applied at the i/p, we get square wave at the op-Amp o/p (at point ... to two channel of the CRO. The time duration between the pulses corresponding to voltages represent the phase between them.
Show More
127 views
1 answer
asked
May 2, 2020
by
anonymous

Explain the concept of lagging and leading phase angle by waveform.
Last 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.
Show More
378 views
1 answer
asked
Apr 27, 2020
by
anonymous

Explain the procedure to perform Short Circuit test on single phase transformer with circuit diagram.
Show More
113 views
0 answers
asked
Apr 27, 2020
by
anonymous

Draw and explain RC phase shift Oscillator.
Last Answer : Circuit diagram of RC phase shift oscillator: WORKING: * Circuit consists of a single stage amplifier in common emitter configuration & RC phase shifting network. * R1, R2, RE provides biasing & CE ... . * The phase shift around the loop is 3600 only at one precise frequency.
Show More
743 views
2 answers
asked
Sep 4, 2018
by
anonymous

Write short notes on 3 phase AC system.
Show More
120 views
0 answers
asked
Aug 11, 2018
by
anonymous

Temperature controller using SCR
Last Answer : Temperature controller using SCR The temperature control circuit is used to regulate the temperature. Figure shows the temperature control circuit using thermostat as temperature detector and SCR as ... half-cycle and heater gets connected to source to produce heat and raise the temperature.
Show More
415 views
1 answer
asked
Oct 13, 2019
by
anonymous

Draw and explain pneumatic proportional controller.
Last Answer : Explanation : Basic : Proportional control is one in which the process input is change in direct proportion to the error(t) controls the output so that the manipulated variable and the error has proportional relation. ... the MV and SP reference value called as error Given as : Error = SP - MV
Show More
121 views
1 answer
asked
Jul 21, 2019
by
anonymous

Explain Keypad controller.
Last Answer : Keypad Controller: It's a device which interfaces between the computer and keyboard. That is a input device and used for transfer the data to connected device.
Show More
305 views
2 answers
asked
Jan 24, 2018
by
anonymous

Draw a neat diagram of 1Ф half wave controlled converter with RL load. Give its operation.
Last Answer : Single phase fully controlled half wave converter: The circuit diagram of single-phase half-wave controlled rectifier with RL load and without freewheeling diode is shown in Fig. (a). The SCR T is ... , when again pulse is applied, the SCR is turned on & the above cycle is repeated.
Show More
3.0k views
2 answers
asked
Jul 25, 2019
by
anonymous

What is the purpose of auxiliary controller in substation?
Last Answer : The systems of substation auxiliaries ensure operation of substations providing internal consumers of substations with operating direct and alternating currents. Any breakdown (loss) of auxiliary systems ... whole substation, as well as serious problems during its subsequent putting into operation.
Show More
93 views
1 answer
asked
Sep 1, 2019
by
anonymous

Define Integral controller. State their advantages
Last Answer : Advantages of integral control action: 1) Improves steady state response 2) Removes offset error in the process variable. 3) Eliminates steady state error
Show More
94 views
1 answer
asked
Aug 16, 2019
by
anonymous

When to select P-I controller? Give any two application of P-I controller.
Last Answer : Selection of P-I controller: The PI mode of controller is commonly selected for slow-to- moderate speed processes. Fast response of the system is not required. Large disturbances and ... an issue. As a adaptive controller for flow process. Real time pressure control process.
Show More
52 views
1 answer
asked
Aug 9, 2019
by
anonymous

A Unified Power Flow Controller (FACTS controller) is a voltage source converter based (A) Inter-phase power controller (B) Static Compensator (C) Combination of series and shunt compensators (D) Solid-state series compensator
Last Answer : A Unified Power Flow Controller (FACTS controller) is a voltage source converter based Combination of series and shunt compensators
Show More
111 views
1 answer
asked
Apr 28, 2018
by
anonymous

What is an electronic controller?
Show More
63 views
0 answers
asked
Mar 10, 2018
by
anonymous

Explain the operation of full bridge converters with their different operating modes. State its advantages and disadvantages.
Last Answer : Full bridge converter: Full bridge converter provides isolation between input and output. Full bridge converter is used for step up or step down the input voltage. Full bridge converter consists of four power semiconductor ... Require filter on both input and output.
Show More
256 views
1 answer
asked
Feb 12, 2018
by
anonymous

Draw full bridge & half bridge configuration with common cathode.
Last Answer : Half Bridge Configuration: Full Bridge Configuration:
Show More
309 views
1 answer
asked
Oct 13, 2019
by
anonymous

A four -quadrant operation requires two full converters connected in (1) Series (3) Back to back (2) Parallel (4) Series Cascade
Last Answer : A four-quadrant operation requires two full converters connected in Parallel
Show More
883 views
1 answer
asked
Apr 30, 2018
by
anonymous
