Ripple in output current of a step-down chopper feeding RLE load is maximum, when duty cycle is equal to:

Ripple in output current of a step-down chopper feeding RLE load is maximum, when duty cycle is equal to: 

(1) 1 (2) 0.5

(3) 0.75 (4) 0.33
by

2 Answers

Answer :

Ripple in output current of a step-down chopper feeding RLE load is maximum, when duty cycle is equal to: 0.5

by

Answer :

Ripple in output current of step down Chopper feeding a RLE load is maximum, when duty cycle is equal to 0.5
by

Related questions

A chopper operating at a fixed frequency is feeding an R-L load. As they duty ratio of the chopper is increased...

Description : A chopper operating at a fixed frequency is feeding an R-L load. As they duty ratio of the chopper is increased from 25% to 75%, the ripple in the load current.

Last Answer : Remains constant.

The ripple content of load current of a converter feeding RL load is decided by

Description : The ripple content of load current of a converter feeding RL load is decided by  A) Load resistance alone B) Load inductance alone C) Both load resistance and load inductance D) Neither resistance nor inductance

Last Answer : The ripple content of load current of a converter feeding RL load is decided by Both load resistance and load inductance

In dc choppers per unit ripple is maximum when duty cycle is

Description : In dc choppers per unit ripple is maximum when duty cycle is   (a) 0.2 (b) 0.5 (c) 0.7 (d) 0.9

Last Answer : In dc choppers per unit ripple is maximum when duty cycle is 0.5 

Write down the expression for the average output voltage for step down and step up chopper.

Description : Write down the expression for the average output voltage for step down and step up chopper.

Last Answer : Average output voltage for step down chopper is VO= αVS. Average output voltage for step up chopper is VO= αVSx [1/ ( 1- α)].

Write down the expression for average output voltage for step up chopper.

Description : Write down the expression for average output voltage for step up chopper.

Last Answer : Average output voltage for step down chopper V0= Vs, αis the duty cycle 1- α

Write down the expression for average output voltage for step down chopper.

Description : Write down the expression for average output voltage for step down chopper.

Last Answer : Average output voltage for step down chopper V0 = αVs, αis the duty cycle

A three phase fully controlled bridge converter is feeding a load drawing a constant and ripple free load

Description : A three phase fully controlled bridge converter is feeding a load drawing a constant and ripple free load current of 10 A at a firing angle of 30o. The approximate Total harmonic Distortion (%THD) and the rms value of fundamental component ... (B) 31% and 7.8 A (C) 66% and 6.8 A (D) 66% and 7.8 A

Last Answer : A three phase fully controlled bridge converter is feeding a load drawing a constant and ripple free load current of 10 A at a firing angle of 30o. The approximate Total harmonic Distortion (%THD) and the rms value of fundamental component of input current will respectively be 31% and 7.8 A

A single-phase full-bridge diode rectifier delivers a load current of 10A, which is ripple free.

Description : A single-phase full-bridge diode rectifier delivers a load current of 10A, which is ripple free. Average and rms values of diode currents are respectively   (a) 10A, 7.07A (b) 5A, 10A (c) 5A, 7.07A (d) 7.07A, 5A

Last Answer : A single-phase full-bridge diode rectifier delivers a load current of 10A, which is ripple free. Average and rms values of diode currents are respectively 5A, 7.07A

The ripple voltage in the output of a single phase half wave rectifier with 10 V rectified dc

Description : The ripple voltage in the output of a single phase half wave rectifier with 10 V rectified dc voltage with resistive load and without filter will be • 12.1 volt • 1.21 volt • 0.482 volt • 4.82 volt

Last Answer : The ripple voltage in the output of a single phase half wave rectifier with 10 V rectified dc voltage with resistive load and without filter will be 12.1 volt

In a half-wave rectifier, if an a.c supply is 60 Hz. Then what is the a.c ripple at output?

Description : In a half-wave rectifier, if an a.c supply is 60 Hz. Then what is the a.c ripple at output? (A) 30 Hz (B) 60 Hz (C) 20 Hz (D) 15 Hz

Last Answer : In a half-wave rectifier, if an a.c supply is 60 Hz. Then what is the a.c ripple at output? (A) 30 Hz (B) 60 Hz (C) 20 Hz (D) 15 Hz

If the electricity represented by the wave form in 'B' were applied to the left side of the illustrated circuit, the output on the right side would be ____________. EL-0064 A. direct current with the top lead positive with repect to the lower lead B. direct current, half wave rectified with a ripple frequency of 60 hz C. direct current with the top lead negative with repect to the lower lead D. clipped to a value equal to the square root of 3 times the input voltage value

Description : If the electricity represented by the wave form in 'B' were applied to the left side of the illustrated circuit, the output on the right side would be ____________. EL-0064 A. direct current with the ... lower lead D. clipped to a value equal to the square root of 3 times the input voltage value

Last Answer : Answer: C

What is meant by step-up and step-down chopper?

Description : What is meant by step-up and step-down chopper?

Last Answer : In a step- down chopper or Buck converter, the average output voltage is less than the input voltage. In a step- up chopper or Boost converter, the average output voltage is more than the input voltage.

A step-down chopper, fed from a 120 volt DC source, operates a DC motor whose armature e.m.f. and

Description : A step-down chopper, fed from a 120 volt DC source, operates a DC motor whose armature e.m.f. and armature resistance are 100 volt and 0.5Ω respectively. With the magnitude control ratio 0.6, the quadrant of operation DC motor is  (a) First (b) Second (c) Third (d) Fourth

Last Answer : A step-down chopper, fed from a 120 volt DC source, operates a DC motor whose armature e.m.f. and armature resistance are 100 volt and 0.5Ω respectively. With the magnitude control ratio 0.6, the quadrant of operation DC motor is First

Capacitors are used on the output of the power supply in today's consoles to _____________. A. filter out 'ripple' B. prevent overloads C. act as a permanent load D. decrease the average value of the output voltage

Description : Capacitors are used on the output of the power supply in today's consoles to _____________. A. filter out 'ripple' B. prevent overloads C. act as a permanent load D. decrease the average value of the output voltage

Last Answer : Answer: A

Each flip-flop in a 4-bit ripple counter introduces a maximum delay of 40 n sec. The maximum clock frequency

Description : Each flip-flop in a 4-bit ripple counter introduces a maximum delay of 40 n sec. The maximum clock frequency is (a) 2.65 MHz (b) 6.25 MHz (c) 5.26 MHz (d) 6.52 MHz 

Last Answer : Each flip-flop in a 4-bit ripple counter introduces a maximum delay of 40 ns. The maximum clock frequency is 6.25MHz. nff  * Tdelay = 4*40 =160ns so, max. frequency = 1/ (200*10-9 ) = 6.25MHz          

A dc chopper is fed from a constant voltage mains the duty ratio of chopper is progressively increased while

Description : A dc chopper is fed from a constant voltage mains the duty ratio of chopper is progressively increased while the chopper feeds an RL load. The per unit current ripple would  (1) increase progressively  (2 ... 0.5 and then increase  (4) increase to a maximum value at α = 0.5 and then decrease

Last Answer : A dc chopper is fed from a constant voltage mains the duty ratio of chopper is progressively increased while the chopper feeds an RL load. The per unit current ripple would increase to a maximum value at α = 0.5 and then decrease

A single phase fully controlled bridge converter supplies a load drawing constant and ripple free load current,

Description : A single phase fully controlled bridge converter supplies a load drawing constant and ripple free load current, if the triggering angle is 30o, the input power factor will be  (A) 0.65 (B) 0.78 (C) 0.85 (D) 0.866

Last Answer : A single phase fully controlled bridge converter supplies a load drawing constant and ripple free load current, if the triggering angle is 30o, the input power factor will be 0.78

An FET is a better chopper than a BJT because it has

Description : An FET is a better chopper than a BJT because it has (A) lower offset voltage (B) higher series ON resistance (C) lower input current (D) higher input impedance

Last Answer : An FET is a better chopper than a BJT because it has lower offset voltage

The efficiency of a chopper can be expected in the range

Description : The efficiency of a chopper can be expected in the range

Last Answer : The efficiency of a chopper can be expected in the range 92 to 99 percent.

The ripple factor in an LC filter.

Description : The ripple factor in an LC filter.   (A) Increases with the load current (B) Increases with the load resistance (C) Remains constant with the load current (D) Has the lowest value

Last Answer : The ripple factor in an LC filter. Has the lowest value

Ripple factor for a half wave rectifier is ....

Description : Ripple factor for a half wave rectifier is  a. 1.65 b. 1.45 c. 1 d. 1.21 

Last Answer : Ripple factor for a half wave rectifier is 1.21

A step voltage E is applied to a series R-L circuit. The rate of change of current is maximum at t = _:

Description : A step voltage E is applied to a series R-L circuit. The rate of change of current is maximum at t = _:  (1) Zero (2) Infinity (3) L/R (4) R/L 

Last Answer : A step voltage E is applied to a series R-L circuit. The rate of change of current is maximum at t = Zero.

What are the disadvantages of load commutated chopper?

Description : What are the disadvantages of load commutated chopper?

Last Answer : a. For high power applications, efficiency becomes very low because of high switching losses at high operating frequencies. b. Freewheeling diode is subjected to twice the supply voltage. c ... other pair is commutated. This can be realized by sensing the capacitor current that is alternating.

What are the advantages of load commutated chopper?

Description : What are the advantages of load commutated chopper?

Last Answer : a. Commutating inductor is not required. b. It is capable of commutating any amount of load current. c. It can work at high frequencies in the order of kHz. d. Filtering requirements are minimal.

If the inductance of a choke-input filter is increased, will the output ripple voltage amplitude (Er) increase or decrease?

Description : If the inductance of a choke-input filter is increased, will the output ripple voltage amplitude (Er) increase or decrease?

Last Answer : Decrease.

In step down transformer, the AC output gives the current _________ than the input current.

Description : In step down transformer, the AC output gives the current _________ than the input current.

Last Answer : more

A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction

Description : A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is  (A) magnetizing (B) demagnetizing (C) cross-magnetizing (D) ineffective

Last Answer : A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is demagnetizing 

A 3 -phase, fully controlled, converter is feeding power into a DC load at a constant current of 150 A, the rms

Description : A 3 -phase, fully controlled, converter is feeding power into a DC load at a constant current of 150 A, the rms value of the current flowing through each thyristor of the converter is

Last Answer : Please show the solution for this question

In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of?

Description : In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of?

Last Answer : In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of less than 15A.

What are the advantages of current commutated chopper?

Description : What are the advantages of current commutated chopper?

Last Answer : a. The capacitor always remains charged with the correct polarity. b. Commutation is reliable as load current is less than the peak commutation current ICP. c. The auxiliary thyristor TA is naturally commutated as its current passes through zero value.

A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty - cycle is equal to:

Description : A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty - cycle is equal to: A. 25% B. 50% C. 1% D. 100%

Last Answer : A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty - cycle is equal to:  25%

What is the maximum current allowed to be drawn from the secondary of a 2 KVA step-down transformer with a turns ratio of four to one if connected across a 440 volt line? A. 1.1 amps B. 4.5 amps C. 18.1 amps D. 22.7 amps

Description : What is the maximum current allowed to be drawn from the secondary of a 2 KVA step-down transformer with a turns ratio of four to one if connected across a 440 volt line? A. 1.1 amps B. 4.5 amps C. 18.1 amps D. 22.7 amps

Last Answer : Answer: C

What is the maximum allowable primary current of a 2 KVA step-down transformer with a four to one turns ratio if connected across a 440 volt line? A. 1.1 amps B. 4.5 amps C. 18.1 amps D. 27.7 amps

Description : What is the maximum allowable primary current of a 2 KVA step-down transformer with a four to one turns ratio if connected across a 440 volt line? A. 1.1 amps B. 4.5 amps C. 18.1 amps D. 27.7 amps

Last Answer : Answer: B

The component labeled 'CR1' in the circuit shown in the illustration __________________. EL-0085 A. varies its anode/cathode polarity depending on 'RL' current B. rectifies the varying voltage from the collector of 'Q1' C. acts as a low capacitive reactance to smooth ripple D. establishes a constant reference voltage for the base of 'Q1'

Description : The component labeled 'CR1' in the circuit shown in the illustration __________________. EL-0085 A. varies its anode/cathode polarity depending on 'RL' current B. rectifies the varying voltage from the ... reactance to smooth ripple D. establishes a constant reference voltage for the base of 'Q1'

Last Answer : Answer: D

The output of a diesel engine can be increased without increasing the engine speed or size in the following way A. feeding more fuel B. increasing the flywheel size C. heating intake air D. supercharging

Description : The output of a diesel engine can be increased without increasing the engine speed or size in the following way A. feeding more fuel B. increasing the flywheel size C. heating intake air D. supercharging

Last Answer : ANSWER : D

If output voltage is greater than input voltage, then transformer is A. step up B. step down C. faulty D. fatal

Description : If output voltage is greater than input voltage, then transformer is A. step up B. step down C. faulty D. fatal

Last Answer :  step up

The frequency stability of the oscillator output is maximum in _____.

Description : The frequency stability of the oscillator output is maximum in _____.   (a) Crystal oscillator (b) Phase shift oscillator (c) LC oscillator (d) Wien bridge oscillator 

Last Answer : The frequency stability of the oscillator output is maximum in Crystal oscillator. 

In a three phase half wave rectifier feeding resistive load, if the input source is a three phase 4 wire system

Description : In a three phase half wave rectifier feeding resistive load, if the input source is a three phase 4 wire system and line to line voltage is 100 V. The supply frequency is 400 Hz. The ripple frequency at the output is: (1) 400 Hz (2) 800 Hz (3) 1200 Hz (4) None of these

Last Answer : In a three phase half wave rectifier feeding resistive load, if the input source is a three phase 4 wire system and line to line voltage is 100 V. The supply frequency is 400 Hz. The ripple frequency at the output is: 1200 Hz

A stand alone engine driven synchronous generator is feeding a partly inductive load. A capacitor is now

Description : A stand alone engine driven synchronous generator is feeding a partly inductive load. A capacitor is now connected across the load to completely nullify the inductive current. For this operating condition.  ... left unaltered (D) the field current has to be reduced and fuel input left unaltered

Last Answer : A stand alone engine driven synchronous generator is feeding a partly inductive load. A capacitor is now connected across the load to completely nullify the inductive current. For this operating condition.  the field current has to be reduced and fuel input left unaltered

Define: i) Input Offset Voltage ii) Input offset Current iii) Input Bias Current iv) Output offset voltage

Description : Define: i) Input Offset Voltage ii) Input offset Current iii) Input Bias Current iv) Output offset voltage

Last Answer : Definition of parameters of OPAMP is follows:  i) Input Offset Voltage: Input offset voltage is defined as the voltage that must be applied between the two input terminals of an OPAMP to null or ... to ground) and output voltage is obtained non zero such voltage is output offset voltage of opamp.

What do you think about Price Chopper?

Description : What do you think about Price Chopper?

Last Answer : Never heard of it.

How can I become a better food chopper?

Description : How can I become a better food chopper?

Last Answer : this is what i learned: make sure you hold the knife with your thumb on one side of the handle and the rest of your fingers on the other side - don't rest any fingers on the edge of the ... it - it gives you a lot more control over the knife, which will increase your speed, agility and efficiency

i have a chines made mini chopper bike and i cant find a websit that sells parts for it

Description : i have a chines made mini chopper bike and i cant find a websit that sells parts for it

Last Answer : Need Answer

I am looking for a good blender chopper that is dishwasher safe. Any suggestions?

Description : I am looking for a good blender chopper that is dishwasher safe. Any suggestions?

Last Answer : One of the best dishwasher safe blender/chopper is the Kitchen Aid 5-Speed Metallic Blender. They are a little more expensive than the average blender but they last a long time and really take a beating.

Is there any benefit to using an onion chopper instead of a knife?

Description : Is there any benefit to using an onion chopper instead of a knife?

Last Answer : Yes, using an onion chopper instead of a knife will save you a lot of time. It might also save you a few tears!

How can I keep from crying when using an onion chopper?

Description : How can I keep from crying when using an onion chopper?

Last Answer : To avoid crying while chopping an onion, you must first remove the bottom portion of the onion. This is where the roots come out and is the place that contains tear-inducing agents. You must remove it correctly or else you'll still cry.

Price Chopper Coupons?

Description : Price Chopper Coupons?

Last Answer : In todayï ½s tough economy, saving money is more important than ever. Cut out unnecessary luxuries from your budget, go without, and change your spending habits. One new spending habit to adopt is ... for everyday items. Check out http://www2.pricechopper.com/coupons/ and start saving money today.

What are the different types of chopper with respect to commutation process?

Description : What are the different types of chopper with respect to commutation process?

Last Answer : a. Voltage commutated chopper. b. Current commutated chopper. c. Load commutated chopper.

What is meant by PWM control in dc chopper?

Description : What is meant by PWM control in dc chopper?

Last Answer : In this control method, the on time Ton is varied but chopping frequency is kept constant. The width of the pulse is varied and hence this type of control is known as PulseWidth Modulation (PWM).

What is meant by FM control in a dc chopper?

Description : What is meant by FM control in a dc chopper?

Last Answer : In frequency modulation control, the chopping frequency f (or the chopping period T) is varied. Here two controls are possible. a. On-time T onis kept constant b. Off period T offis kept constant.