The efficiency of a chopper can be expected in the range

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

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

Description : 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

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

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

'Marginal efficiency of capital' is - (1) expected rate of return on new investment (2) expected rate of return of existing investment (3) difference between rate of profit and rate of interest (4) value of output per unit of capital invested

Description : 'Marginal efficiency of capital' is - (1) expected rate of return on new investment (2) expected rate of return of existing investment (3) difference between rate of profit and rate of interest (4) value of output per unit of capital invested

Last Answer : (1) expected rate of return on new investment Explanation: The volume of investment depend upon the following two factors: (1) rate of interest: and (2) marginal efficiency of capital. Before ... partly on expectations of future yields and partly on the actual price of the capital good concerned.

The difference in the reservoir level and the lowest point of the water mains is 180 m. The expected pressure due to water hammer is 7.5 kg/cm2 in a pressure conduit of diameter 1 m. Assuming the efficiency of the riveted joints of the pipe as 0.6 and minimum cover 3 mm for corrosion, the thickness of the pipe materials, is (A) 10 mm (B) 15 mm (C) 20 mm (D) 25 mm

Description : The difference in the reservoir level and the lowest point of the water mains is 180 m. The  expected pressure due to water hammer is 7.5 kg/cm2  in a pressure conduit of diameter 1 m.  Assuming the efficiency of the ... , is  (A) 10 mm  (B) 15 mm  (C) 20 mm  (D) 25 mm 

Last Answer : (C) 20 mm

The expected efficiency of a single riveted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased __________ times. (A) Two (B) Four (C) Six (D) Eight

Description : The expected efficiency of a single riveted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased __________ times. (A) Two (B) Four (C) Six (D) Eight

Last Answer : Option A

‘Marginal efficiency of capital’ is (1) expected rate of return on new investment (2) expected rate of return of existing investment (3) difference between rate of profit and rate of interest (4) value of output per unit of capital invested

Description : ‘Marginal efficiency of capital’ is (1) expected rate of return on new investment (2) expected rate of return of existing investment (3) difference between rate of profit and rate of interest (4) value of output per unit of capital invested

Last Answer :  expected rate of return on new investment

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 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.

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.

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.

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)].

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.

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

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.

What are the applications of dc chopper?

Description : What are the applications of dc chopper?

Last Answer : Chopper provides a. High efficiency b. Smooth acceleration c. Fast dynamic response d. Regeneration

What are the applications of dc chopper?

Description : What are the applications of dc chopper?

Last Answer : a. Battery operated vehicles b. Traction motor control in electric traction c. Trolly cars d. Marine hoists e. Mine haulers f. Electric braking.

What is meant by dc chopper?

Description : What is meant by dc chopper?

Last Answer : A dc chopper is a high speed static switch used to obtain variable dc voltage from a constant dc voltage.

What is meant by chopper?

Description : What is meant by chopper?

Last Answer : Chopper converts fixed dc voltage into variable dc voltage

What are the control strategies of chopper?

Description : What are the control strategies of chopper?

Last Answer : The control strategies of chopper are 1. Pulse width modulation PWM (Variable TON, Constant frequency) 2. Frequency modulation (Constant TON or TOFF, Variable frequency) 3. Current Limit Control (CLC)

4-Quadrent operation of chopper I is positive but V is may be positive are negative operates in which quadrant a) 1 and 2 b) 2 and 3 c) 1 and 3 d) 1 and 4

Description : 4-Quadrent operation of chopper I is positive but V is may be positive are negative operates in which quadrant a) 1 and 2 b) 2 and 3 c) 1 and 3 d) 1 and 4

Last Answer : Ans: 1 and 4

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

A DC chopper is used for regenerative braking of a separately excited DC motor. The DC supply

Description : A DC chopper is used for regenerative braking of a separately excited DC motor. The DC supply voltage is 400V. The armature current during regenerative braking is kept constant at 300 A with negligible ripple. For a duty cycle of 60% ... to the DC supply is  (a) 78 kW (b) 58 kW (c) 38 kW (d) 48 kW

Last Answer : 48

A three phase slip ring induction motor with chopper controlled resistance has its torque

Description : A three phase slip ring induction motor with chopper controlled resistance has its torque proportional to   (a) Rotor current (b) Stator resistance (c) Square of rotor current (d) Square root of rotor current 

Last Answer : A three phase slip ring induction motor with chopper controlled resistance has its torque proportional to Square of rotor current

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 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.

Can we use triac in multiquadrant chopper?

Last Answer : Yes, we can use triac in the multi-quadrant chopper.

Explain two quadrant chopper.

Description : Explain two-quadrant chopper.........

Last Answer : Two quadrant chopper:  There are two semiconductor controllable switches in the two-quadrant chopper. Two quadrant type A chopper: The figure shows the type A chopper. Both the switch never turn on at ... 2 are turned on then Vo=Vs. When chopper 1 and chopper 2 are off then Vo=-Vs.

In a thyristor D.C. chopper, which type of commutation results in best performance ?

Description : In a thyristor D.C. chopper, which type of commutation results in best performance ?

Last Answer : voltage commutation

Chopper controlled DC motor

Description : Chopper controlled DC motor

Last Answer : Chopper controlled DC motor

What is antenna bandwidth? A. Antenna length divided by the number of elements B. The angle between the half-power radiation points C. The angle formed between two imaginary lines drawn through D. The frequency range over which an antenna can be expected to operate satisfactorily

Description : What is antenna bandwidth? A. Antenna length divided by the number of elements B. The angle between the half-power radiation points C. The angle formed between two imaginary lines drawn through D. The frequency range over which an antenna can be expected to operate satisfactorily

Last Answer : D. The frequency range over which an antenna can be expected to operate satisfactorily

What is meant by the term antenna bandwidth A. Antenna length divided by the number of elements. B. The angle between the half-power radiation points C. The frequency range over which and antenna can be expected to perform well D. The angle formed between two imaginary line drawn through the ends of the elements

Description : What is meant by the term antenna bandwidth A. Antenna length divided by the number of elements. B. The angle between the half-power radiation points C. The frequency range over which and antenna ... perform well D. The angle formed between two imaginary line drawn through the ends of the elements

Last Answer : C. The frequency range over which and antenna can be expected to perform well

A cash-and-carry wholesaler would be expected to 1. provide transportation 2. handle high turnover products 3. provide credit 4. carry a wide variety of products 5. provide a wide range of services

Description : A cash-and-carry wholesaler would be expected to 1. provide transportation 2. handle high turnover products 3. provide credit 4. carry a wide variety of products 5. provide a wide range of services

Last Answer : handle high turnover products

In the December customer survey, a product would not receive a perfect score of 100 if a. it was priced at the bottom of the expected range. b. it was perfectly positioned. c. it had an MTBF at the middle of the expected range. d. it had 100% awareness. e. it had ideal age for segment.

Description : In the December customer survey, a product would not receive a perfect score of 100 if a. it was priced at the bottom of the expected range. b. it was perfectly positioned. c. it had an MTBF at the middle of the expected range. d. it had 100% awareness. e. it had ideal age for segment.

Last Answer : c. it had an MTBF at the middle of the expected range.

A cash -and -carry wholesaler would be expected to A)provide transportation. B)handle high turnover products. C)provide credit. D)carry a wide variety of products. E)provide a wide range of services.

Description : A cash -and -carry wholesaler would be expected to A)provide transportation. B)handle high turnover products. C)provide credit. D)carry a wide variety of products. E)provide a wide range of services.

Last Answer : B)handle high turnover products

What is the efficiency of Class-B amplifier?

Description : What is the efficiency of Class-B amplifier?  A) 68.50% B) 78.50% C) 88.50% D) 98.50%

Last Answer : What is the efficiency of Class-B amplifier?  A) 68.50% B) 78.50% C) 88.50% D) 98.50%

Rectification efficiency of a full wave rectifier without filter is nearly equals to:

Description : Rectification efficiency of a full wave rectifier without filter is nearly equals to:  (1) 51% (2) 61% (3) 71% (4) 81%

Last Answer : Rectification efficiency of a fullwave rectifier without filter is nearly equals to: 81%

In any transmitting antenna system, efficiency primarily depends upon

Last Answer : In any transmitting antenna system, efficiency primarily depends upon radiation resistance.

In a CB amplifier the maximum efficiency could be

Last Answer : In a CB amplifier the maximum efficiency could be 25%.

Why the range of efficiency in transformers higher than those of other electrical machines?

Description : Why the range of efficiency in transformers higher than those of other electrical machines?

Last Answer : Transformers operate at higher efficiency when compared to other electrical machines.This is due to the absence of mechanical losses which is due to the absence of moving parts

What is the range of efficiency of transformers?

Description : What is the range of efficiency of transformers?

Last Answer : A:The efficiency of the transformer will be in the range of 94% to 99%. Among the available electrical machines the transformer has the highest efficiency