In dc choppers for chopping period T, the output voltage can be controlled by FM by varying

In dc choppers for chopping period T, the output voltage can be controlled by FM by varying 

 (A) T keeping Ton constant (B) Ton keeping T constant (C) Toff keeping T constant (D) None of the above
by

1 Answer

Answer :

In dc choppers for chopping period T, the output voltage can be controlled by FM by varying T keeping Ton constant

by

Related questions

In d.c. choppers, for periodic time T, the output voltage can be controlled by frequency modulation by varying

Description : In d.c. choppers, for periodic time T, the output voltage can be controlled by frequency modulation by varying

Last Answer : In d.c. choppers, for periodic time T, the output voltage can be controlled by frequency modulation by varying T, keeping ton constant

The voltage output of an AC generator is accurately controlled by _____________. A. changing the sensitivity of the prime mover to large changes in voltage B. varying the reluctance of the air gap C. varying the DC exciter voltage D. shorting out part of the armature windings

Description : The voltage output of an AC generator is accurately controlled by _____________. A. changing the sensitivity of the prime mover to large changes in voltage B. varying the reluctance of the air gap C. varying the DC exciter voltage D. shorting out part of the armature windings

Last Answer : Answer: C

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 

The voltage developed by an AC generator is controlled by varying the ____________. A. speed of the prime mover B. AC excitation to the field C. DC excitation to the field D. DC excitation of the voltage regulator

Description : The voltage developed by an AC generator is controlled by varying the ____________. A. speed of the prime mover B. AC excitation to the field C. DC excitation to the field D. DC excitation of the voltage regulator

Last Answer : Answer: C

In a three phase controlled bridge rectifier with an increase of overlap angles the output dc voltage

Description : In a three phase controlled bridge rectifier with an increase of overlap angles the output dc voltage

Last Answer : In a three phase controlled bridge rectifier with an increase of overlap angles the output dc voltage decreases

The speed of a series wound winch motor is controlled by ____________. A. varying the voltage applied to the motor B. the weight of the load on the cargo boom C. overcurrent protection devices in the motor D. a hydraulic speed-limiting governor

Description : The speed of a series wound winch motor is controlled by ____________. A. varying the voltage applied to the motor B. the weight of the load on the cargo boom C. overcurrent protection devices in the motor D. a hydraulic speed-limiting governor

Last Answer : Answer: A

Pick out the wrong statement. (A) The X-rays cannot be deflected by electric field unlike cathode rays (B) The intensity of X-rays can be measured by ionisation current produced due to the ionisation of gas by X-rays (C) The quality of X-rays can be controlled by varying the anode-cathode voltage (D) Crystal structure of a material can be studied by an electron microscope

Description : Pick out the wrong statement. (A) The X-rays cannot be deflected by electric field unlike cathode rays (B) The intensity of X-rays can be measured by ionisation current produced due to the ... the anode-cathode voltage (D) Crystal structure of a material can be studied by an electron microscope

Last Answer : (C) The quality of X-rays can be controlled by varying the anode-cathode voltage

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

A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc

Description : A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is (A) 4.5 V (B) 6.75 V (C) 9 V (D) 13.5 V

Last Answer : A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is 9 V

What kind of effect is referred to a varying light producing a varying voltage output of a detector? A. Current effect B. Voltage effect C. Resistive effect D. Photovoltaic effect

Description : What kind of effect is referred to a varying light producing a varying voltage output of a detector? A. Current effect B. Voltage effect C. Resistive effect D. Photovoltaic effect

Last Answer : D. Photovoltaic effect

why mosfet is voltage controlled device?

Last Answer : already answered here is mosfet current controlled device?

Explain DC coupled drive circuit with unipolar output.

Description : Explain DC coupled drive circuit with unipolar output.

Last Answer : DC coupled drive circuit with unipolar output: The figure shows the circuit and waveforms

In order to reduce the voltage surges due to current chopping and capacitive current breaking,

Description : In order to reduce the voltage surges due to current chopping and capacitive current breaking, we connect (A) A resistor across the CB contacts. (B) A capacitor across the CB contacts. (C) An inductor across the CB contacts. (D) A switch across the CB contacts

Last Answer : In order to reduce the voltage surges due to current chopping and capacitive current breaking, we connect A resistor across the CB contacts.

An unsaturated dc shunt motor runs at its rated speed when rated voltage is applied to it. If the

Description : An unsaturated dc shunt motor runs at its rated speed when rated voltage is applied to it. If the supply voltage to the motor is reduced by 25%, the speed of the motor  (a) Increases by 25% (b) Remains the same (c) Decreases by 25% (d) Decrease only slightly by an amount less than 25% 

Last Answer : An unsaturated dc shunt motor runs at its rated speed when rated voltage is applied to it. If the supply voltage to the motor is reduced by 25%, the speed of the motor Remains the same

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

One of the FM signal generator control which varies the phase of the modulating voltage applied to the oscillator of the sweep generator A. Band control B. Phase control C. Marker amplitude control D. Sweep output control

Description : One of the FM signal generator control which varies the phase of the modulating voltage applied to the oscillator of the sweep generator A. Band control B. Phase control C. Marker amplitude control D. Sweep output control

Last Answer : B. Phase control

The output voltage V0 of the Schmitt trigger shown in figure swings between +15V and —1 5V. Assume that

Description : The output voltage V0 ofthe Schmitt trigger shown in figure swings between +15V and -1 5V. Assume that the operational amplifier is ideal. The output will change from +1 5 V to -1 5V when the ... slope only C) Vin the positive and negative slopes D) 3 V in the positive and negative slopes

Last Answer : The output voltage V0 ofthe Schmitt trigger shown in figure swings between +15V and —1 5V. Assume that the operational amplifier is ideal. The output will change from +1 5 V to -1 5V when the instantaneous value of the input sine wave is 5 V in the positive slope only

In a 3-phase half-wave rectifier, if per phase input is 200 V, then the average output voltage is

Description : In a 3-phase half-wave rectifier, if per phase input is 200 V, then the average output voltage is   (a) 233.91 V (b) 116.95V (c) 202.56 V (d) 101.28V 

Last Answer : a

How do you make choppers in Strategic assault in iPhone?

Description : How do you make choppers in Strategic assault in iPhone?

Last Answer : I don’t own this game, but here is the developers website contact info. I’m sure they could tell you or maybe have a manual for the game. http://www.xengames.com/support.htm

Capacity of field choppers (chaff cutter) is affected by.... (a) Capacity of the feed mechanism (cross-sectional area) (b) Rate of advance of material through throat considered as to be same linear speed of feed mechanism (c) Density of forage material (d) All of the above

Description : Capacity of field choppers (chaff cutter) is affected by.... (a) Capacity of the feed mechanism (cross-sectional area) (b) Rate of advance of material through throat considered as to be same linear speed of feed mechanism (c) Density of forage material (d) All of the above

Last Answer : (d) All of the above

Capacity of field choppers (chaff cutter) is affected by (a)capacity of the feed mechanism (cross sectional area) (b)Rate of advance of material through throat considered as to be the same linear speed of feed mechanism (c) density of forage material (d) all of the above

Description : Capacity of field choppers (chaff cutter) is affected by (a)capacity of the feed mechanism (cross sectional area) (b)Rate of advance of material through throat considered as to be the same linear speed of feed mechanism (c) density of forage material (d) all of the above

Last Answer : (d) all of the above

Detonation can be controlled by a. varying the compression ratio b. using lean mixture c. retarding the spark timing d. reducing the rpm

Description : Detonation can be controlled by a. varying the compression ratio b. using lean mixture c. retarding the spark timing d. reducing the rpm

Last Answer : ANSWER c. retarding the spark timing

In an AC synchronous motor electric propulsion plant, propeller speed is controlled by varying the _____________. A. prime mover speed B. electric coupling field strength C. number of energized main motor poles D. propulsion generator field strength

Description : In an AC synchronous motor electric propulsion plant, propeller speed is controlled by varying the _____________. A. prime mover speed B. electric coupling field strength C. number of energized main motor poles D. propulsion generator field strength

Last Answer : Answer: A

The speed of a 4-pole induction motor is controlled by varying the supply frequency while maintaining the

Description : The speed of a 4-pole induction motor is controlled by varying the supply frequency while maintaining the ratio of supply voltage to supply frequency (V/f ) constant. At rated frequency of 50 Hz and rated voltage of 400 V ... load torque is constant  (A) 882 rpm (B) 864 rpm (C) 840 rpm (D) 828 rpm

Last Answer : The speed of a 4-pole induction motor is controlled by varying the supply frequency while maintaining the ratio of supply voltage to supply frequency (V/f ) constant. At rated frequency of 50 Hz and rated voltage of 400 ... torque is constant  (A) 882 rpm (B) 864 rpm (C) 840 rpm (D) 828 rpm

The speed of a D.C. motor can be controlled by varying

Description : The speed of a D.C. motor can be controlled by varying  1. Its flux per pole 2. Resistance of armature circuit 3. Applied voltage 4. All of the above

Last Answer : The speed of a D.C. motor can be controlled by varying  1. Its flux per pole 2. Resistance of armature circuit 3. Applied voltage 4. All of the above

Which of the following statements represents an application of a silicon controlled rectifier? A. To provide DC power for a main propulsion motor. B. For use as a voltage reference diode. C. For sensing flame in an automated burner. D. To eliminate power supply hum.

Description : Which of the following statements represents an application of a silicon controlled rectifier? A. To provide DC power for a main propulsion motor. B. For use as a voltage reference diode. C. For sensing flame in an automated burner. D. To eliminate power supply hum.

Last Answer : Answer: A

Modulation means A. Varying of information B. Utilization of a single transmission channel to carry multiple signals C. Varying of some parameters of a carrier such as its amplitude to transmit information D. Transmit pulses in DC form on a copper wire

Description : Modulation means A. Varying of information B. Utilization of a single transmission channel to carry multiple signals C. Varying of some parameters of a carrier such as its amplitude to transmit information D. Transmit pulses in DC form on a copper wire

Last Answer : C. Varying of some parameters of a carrier such as its amplitude to transmit information

The output voltage of a 440 volt, 60 Hz AC generator is controlled by the ______________. A. load on the alternator B. load on the prime mover C. speed of the prime mover D. exciter output voltage

Description : The output voltage of a 440 volt, 60 Hz AC generator is controlled by the ______________. A. load on the alternator B. load on the prime mover C. speed of the prime mover D. exciter output voltage

Last Answer : Answer: D

The frequency output of an operating alternator is controlled by the _____________. A. relative speed of the rotor poles B. number of turns of wire in the armature coil C. strength of the magnets used D. output voltage

Description : The frequency output of an operating alternator is controlled by the _____________. A. relative speed of the rotor poles B. number of turns of wire in the armature coil C. strength of the magnets used D. output voltage

Last Answer : Answer: A

The output voltage of a 440 volt, 60 hertz, AC generator is controlled by the _____________. A. prime mover speed B. exciter output voltage C. load on the alternator D. number of poles

Description : The output voltage of a 440 volt, 60 hertz, AC generator is controlled by the _____________. A. prime mover speed B. exciter output voltage C. load on the alternator D. number of poles

Last Answer : Answer: B

How is output voltage controlled in practical alternators?

Description : How is output voltage controlled in practical alternators?

Last Answer : By varying the voltage applied to the field windings.

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.

The drying time between fixed moisture content within diffusion controlled 'falling rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid). (A) √T (B) T (C) T 2 (D) T

Description : The drying time between fixed moisture content within diffusion controlled 'falling rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid). (A) √T (B) T (C) T 2 (D) T

Last Answer : (C) T

A single phase, half-wave, controlled rectifier has 400 sin (314 t) as the input voltage and R as the load...

Description : A single phase, half-wave, controlled rectifier has 400 sin (314 t) as the input voltage and R as the load. For a firing angle of 60° for the SCR, the average output voltage is   (a) 240/π (b) 400/π (c) 300/π (d) 200/π 

Last Answer : C

What is "strategic control"? a) Control over the production process within an organization, in the sense of determining how the employees of an organization perform their work. b) The process by which one entity influences, to varying degrees, the behaviour and output of another entity through informal mechanisms. c) Control over the means and methods on which the whole conduct of an organization depends. d) Control over the production process within an organization, in the sense of determining how informal practices are performed.

Description : What is "strategic control"? a) Control over the production process within an organization, in the sense of determining how the employees of an organization perform their work. b) The ... production process within an organization, in the sense of determining how informal practices are performed.

Last Answer : Control over the means and methods on which the whole conduct of an organization depends.

In the illustration, the component VR2 on the A1 AMPLIFIER MODULE is _________. EL-0060 A. a zener diode to regulate the +9 volt power supply from common B. a variable resistor diode to control the output to terminal 1 that controls the input to terminal 10 C. a zener diode that regulates the voltage to terminal 2 at 9.1 volts DC D. a tunnel diode with a breakdown voltage of 6.6 Volts DC

Description : In the illustration, the component VR2 on the A1 AMPLIFIER MODULE is _________. EL-0060 A. a zener diode to regulate the +9 volt power supply from common B. a variable resistor diode to control the output to terminal ... 2 at 9.1 volts DC D. a tunnel diode with a breakdown voltage of 6.6 Volts DC

Last Answer : Answer: C

In the illustration, the component VR1 on the A1 AMPLIFIER MODULE is _________. EL-0060 A. a zener diode to regulate the +9 volt power supply from common B. a variable resistor diode to control the output to terminal 9 that controls the input to terminal 10 C. a zener diode that regulates the voltage to terminal 9 at 6.6 volts DC D. a tunnel diode with a breakdown voltage of 6.6 Volts DC

Description : In the illustration, the component VR1 on the A1 AMPLIFIER MODULE is _________. EL-0060 A. a zener diode to regulate the +9 volt power supply from common B. a variable resistor diode to control the output to ... terminal 9 at 6.6 volts DC D. a tunnel diode with a breakdown voltage of 6.6 Volts DC

Last Answer : Answer: A

In the illustration, the component VR1 on the A1A1 PCB is _________. EL-0060 A. a zener diode to regulate the +9 volt power supply B. a variable resistor diode to control the output to terminal 9 that controls the input to terminal 10 C. a zener diode that regulates the voltage to terminal 9 at 6.6 volts DC D. a tunnel diode with a breakdown voltage of 6.6 Volts DC

Description : In the illustration, the component VR1 on the A1A1 PCB is _________. EL-0060 A. a zener diode to regulate the +9 volt power supply B. a variable resistor diode to control the output to terminal 9 that controls ... terminal 9 at 6.6 volts DC D. a tunnel diode with a breakdown voltage of 6.6 Volts DC

Last Answer : Answer: C

The output voltage of a three-phase alternator is regulated by the _____________. A. AC voltage to the armature B. AC voltage to the field C. DC voltage to the armature D. DC voltage to the field

Description : The output voltage of a three-phase alternator is regulated by the _____________. A. AC voltage to the armature B. AC voltage to the field C. DC voltage to the armature D. DC voltage to the field

Last Answer : Answer: D

Why Does Curving The Pole Faces In A Dc Machines Contributes To A Smoother Dc Output Voltage From It?

Description : Why Does Curving The Pole Faces In A Dc Machines Contributes To A Smoother Dc Output Voltage From It?

Last Answer : For having smoother output voltage from DC machines its commutation must be as ideal as possible. In order to have good commutation the flux density in the air gap must decrease gradually from maximum value under the center of the pole to zero on.

What two factors can cause output dc voltage to change?

Description : What two factors can cause output dc voltage to change?

Last Answer : Ac line voltage and a change in load resistance.

Why does using ac vice dc bias voltage result in a stronger output signal?

Description : Why does using ac vice dc bias voltage result in a stronger output signal?

Last Answer : Because an ac bias voltage of the proper frequency and level places the input signal away from both steps in the magnetism curve. The result is two undistorted output signals that are combined into one strong output.

What component causes a generator to produce dc voltage rather than ac voltage at its output terminals?

Description : What component causes a generator to produce dc voltage rather than ac voltage at its output terminals?

Last Answer : A commutator

The output from a full wave rectifier is (a) A pulsating uni-directional current (b) A DC voltage (c) Zero (d) An AC voltage

Description : The output from a full wave rectifier is (a) A pulsating uni-directional current (b) A DC voltage (c) Zero (d) An AC voltage

Last Answer : a) A pulsating uni-directional current

An AC supply of 230 V is applied to half wave rectifier circuit. A transformer turns ratio is 20 : 1. Find i) Output DC voltage (ii) Peak Inverse Voltage (PIV)

Description : An AC supply of 230 V is applied to half wave rectifier circuit. A transformer turns ratio is 20 : 1. Find i) Output DC voltage (ii) Peak Inverse Voltage (PIV)

Last Answer : Solution:

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

State classification of Phase controlled rectifiers.

Description : State classification of Phase controlled rectifiers.

Last Answer : Classification of phase controlled rectifiers:

Single-phase mid-point controlled rectifier with RL load

Description : Single-phase mid-point controlled rectifier with RL load

Last Answer : Single-phase mid-point controlled rectifier with RL load : The circuit configuration of single-phase midpoint controlled rectifier is shown in the figure. During positive half-cycle of ... some part of next positive half-cycle of voltage with reversed polarity can appear across load.

Single-phase Midpoint controlled rectifier with Resistive load

Description : Single-phase Midpoint controlled rectifier with Resistive load

Last Answer : Single-phase Midpoint controlled rectifier with Resistive load:  1) During positive half cycle of AC supply, a is positive with respect to b , this makes T1 forward biased and T2 is reverse ... voltage reverses the polarity and T2 is turned off. The operation is as shown in waveforms.

Give the operation of single phase full wave bridge controlled converter with RL load with a neat diagram. Also draw its waveform.

Description : 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.