DC current can be controlled by which component?

DC current can be controlled by which component?
by

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Answer :

– Resistance
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DC current can be controlled by which component?

Description : DC current can be controlled by which component?

Last Answer : Resistance

A silicon controlled rectifier (SCR) is a solid state device used to change ________________. A. DC to AC and control relatively low load current B. AC to DC and control relatively high load current C. DC to AC and control relatively high load current D. AC to DC and control relatively low load current

Description : A silicon controlled rectifier (SCR) is a solid state device used to change ________________. A. DC to AC and control relatively low load current B. AC to DC and control relatively high load ... to AC and control relatively high load current D. AC to DC and control relatively low load current

Last Answer : Answer: B

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 the illustration, the component labeled 'EXC' is _______. EL-0003 A. a separate class II regulated DC generator for critical direct current loads B. a generator feeding the FLD winding through the voltage regulator. C. the controller to drive the governor for turbogenerator speed. D. the electronic driver for the switchboard metering circuits

Description : In the illustration, the component labeled 'EXC' is _______. EL-0003 A. a separate class II regulated DC generator for critical direct current loads B. a generator feeding the FLD ... to drive the governor for turbogenerator speed. D. the electronic driver for the switchboard metering circuits

Last Answer : Answer: B

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

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

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

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

A single-phase half-controlled rectifier is driving a separately excited dc motor. The dc motor has a back emf

Description : A single-phase half-controlled rectifier is driving a separately excited dc motor. The dc motor has a back emf constant of 0.5 V/rpm. The armature current is 5 A without any ripple. The armature resistance is 2 Ohm. The ... of the motor will be  (A) 339 rpm (B) 359 rpm (C) 366 rpm (D) 386 rpm

Last Answer : 359

A single-phase fully controlled thyristor bridge ac-dc converter is operating at a firing angle of 25 and an

Description : A single-phase fully controlled thyristor bridge ac-dc converter is operating at a firing angle of 25o and an overlap angle of 10o with constant dc output current of 20 A. The fundamental power factor (displacement factor) at input ac mains is  (A) 0.78 (B) 0.827 (C) 0.866 (D) 0.9

Last Answer : A single-phase fully controlled thyristor bridge ac-dc converter is operating at a firing angle of 25o and an overlap angle of 10o with constant dc output current of 20 A. The fundamental power factor (displacement factor) at input ac mains is 0.78

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

Description : 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

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

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

A separately excited dc motor is required to be controlled, from a 3-phase supply, for its operation in the first...

Description : A separately excited dc motor is required to be controlled, from a 3-phase supply, for its operation in the first quadrant only. The most preferred converter would be  (a) 3-phase fully controlled ... converter with free wheel diode (c) 3-phase dual converter (d) 3-phase half wave converter 

Last Answer : A

What is the order of the characteristic equation of an armature controlled DC motor?

Description : What is the order of the characteristic equation of an armature controlled DC motor?  (A) First order equation (B) Second order equation (C) Zero order equation (D) Third order equation 

Last Answer : third order

Ward - Leonard controlled DC drives are generally used for:

Last Answer : Ward - Leonard controlled DC drives are generally used for:  Heavy duty excavators

Chopper controlled DC motor

Description : Chopper controlled DC motor

Last Answer : Chopper controlled DC motor

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

In a resistance loaded, RC coupled amplifier the dc component is blocked by A) Load resistance RL B) Coupling capacitor, CC C) RB D) The transistor.

Description : In a resistance loaded, RC coupled amplifier the dc component is blocked by A) Load resistance RL B) Coupling capacitor, CC C) RB D) The transistor.

Last Answer : B) Coupling capacitor, CC

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

In a half wave rectifier the rms value of AC component of the waves (a) Zero (b) Equal to DC value (c) More than DC value (d) Less than DC value

Description : In a half wave rectifier the rms value of AC component of the waves (a) Zero (b) Equal to DC value (c) More than DC value (d) Less than DC value

Last Answer : b) Equal to DC value

Which component is mainly used in a DC generator: a.slip ring b. commutator c. magnet d. coil

Description : Which component is mainly used in a DC generator: a.slip ring b. commutator c. magnet d. coil

Last Answer : b. commutator

For a DC motor, what major component in addition to the field winding and the armature winding is necessary? w) a commutator x) a stator y) a battery z) a rotor

Description : For a DC motor, what major component in addition to the field winding and the armature winding is necessary? w) a commutator x) a stator y) a battery z) a rotor

Last Answer : ANSWER: W -- A COMMUTATOR

During 3-phase short circuit on a unloaded alternator, the dc component may be zero in

Description : During 3-phase short circuit on a unloaded alternator, the dc component may be zero in (1) One phase only (2) Any two phases (3) All three phases (4) None of the above 

Last Answer : 1

If the magnetic flux density and current are at right angles, then component of force acting on the conductor is A. BIL cosθ B. BIL sinθ C. BIL tanθ D. BL sinθ

Description : If the magnetic flux density and current are at right angles, then component of force acting on the conductor is A. BIL cosθ B. BIL sinθ C. BIL tanθ D. BL sinθ

Last Answer : BIL sinθ

Electric power is related to A. current in component B. potential difference C. electrical resistance D. both A and B

Description : Electric power is related to A. current in component B. potential difference C. electrical resistance D. both A and B

Last Answer : both A and B

A component that allows only unidirectional current to pass through it is A. resistor B. inductor C. transformer D. diode

Description : A component that allows only unidirectional current to pass through it is A. resistor B. inductor C. transformer D. diode

Last Answer : diode

In a simple dc circuit, voltage equals resistance multiplied by current. This is also considered true in an AC circuit if the what values of the current and voltage are used.

Description : In a simple dc circuit, voltage equals resistance multiplied by current. This is also considered true in an AC circuit if the what values of the current and voltage are used.

Last Answer : ANSWER: ROOT MEAN SQUARE (RMS) VALUES

The equation, X = A cos(wt + f) (read: X equals A times the cosine of omega t + phi (fee)), can represent an expression for: w) accelerating due to gravity x) uniform straight line motion y) dc current z) a simple harmonic oscillator

Description : The equation, X = A cos(wt + f) (read: X equals A times the cosine of omega t + phi (fee)), can represent an expression for: w) accelerating due to gravity x) uniform straight line motion y) dc current z) a simple harmonic oscillator

Last Answer : ANSWER: Z -- A SIMPLE HARMONIC OSCILLATOR

A transformer works with (1) alternating current only (2) direct current only (3) both AC and DC (4) any signal

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Last Answer : alternating current only

What is a controlled fission or nuclear reactor ?

Description : What is a controlled fission or nuclear reactor ?

Last Answer : Measures need to be taken to convert heat energy generated from nuclear fission into electrical energy so that huge amount of energy is generated in a very short time and the whole process does not ... energy supply is available for a long time. This is called controlled fission or nuclear reactor.

Which of the following men was involved with the first controlled nuclear reaction? w) Linus Pauling x) Nelson Sartoris y) Edward Teller z) Enrico Fermi

Description : Which of the following men was involved with the first controlled nuclear reaction? w) Linus Pauling x) Nelson Sartoris y) Edward Teller z) Enrico Fermi

Last Answer : ANSWER: Z -- ENRICO FERMI

The sky appears blue because – (1) All colours interfere to produce blue (2) In white light, the blue component dominates (3) The atmosphere scatters blue colour more than the others (4) It is actually blue

Description : The sky appears blue because – (1) All colours interfere to produce blue (2) In white light, the blue component dominates (3) The atmosphere scatters blue colour more than the others (4) It is actually blue

Last Answer : (3) The atmosphere scatters blue colour more than the others Explanation: Diffuse sky radiation is solar radiation reaching the Earth's surface after having been scattered from the direct solar beam by ... the atmosphere (approximately 25% of the incident radiation when the sun is high in the Sky.

During the motion of a projectile fired from the earth surface, ______. (1) its kinetic energy remains constant (2) its momentum remains constant (3) vertical component of its velocity remains constant (4) horizontal component of its velocity remains constant

Description : During the motion of a projectile fired from the earth surface, ______. (1) its kinetic energy remains constant (2) its momentum remains constant (3) vertical component of its velocity remains constant (4) horizontal component of its velocity remains constant

Last Answer : (4) horizontal component of its velocity remains constant Explanation: The motion of a projectile is a two-dimensional motion-Horizontal motion and vertical motion-that take place independent ... continuously affects the vertical component, so the vertical motion is a uniformly accelerated motion.

Railway tracks are banked on curves so that : (1) the train may not fall down inwards. (2) the weight of the train may be reduced. (3) necessary centripetal force may be obtained from the horizontal component of the normal reaction due to track. (4) no frictional force may be produced between the wheels and the track.

Description : Railway tracks are banked on curves so that : (1) the train may not fall down inwards. (2) the weight of the train may be reduced. (3) necessary centripetal force may be obtained from the ... normal reaction due to track. (4) no frictional force may be produced between the wheels and the track.

Last Answer : (3) necessary centripetal force may be obtained from the horizontal component of the normal reaction due to track. Explanation: A vehicle moving at a fast speed on a straight rail/ road has ... it experiences an additional force, termed as centripetal force, acting towards the centre of the circle.

Purpose of an optical filter is to – (1) reflect lights of different colours (2) dispense light into component colours (3) refract light of different colours (4) transmit or absorb light of different colours

Description : Purpose of an optical filter is to – (1) reflect lights of different colours (2) dispense light into component colours (3) refract light of different colours (4) transmit or absorb light of different colours

Last Answer : (4) transmit or absorb light of different colours Explanation: Optical filters are devices that selectively transmit light in a particular range of wavelengths, that is, colors, while ... as absorptive filters), fluorescence microscopy, spectroscopy, clinical chemistry, colour stage lighting, etc.

Railway tracks are banked on curves so that – (1) Necessary centrifugal force may be obtained from the horizontal component of the weight of the train (2) No frictional force may be produced between the tracks and the wheels of the train (3)Necessary centripetal force may be obtained from the horizontal component of the weight of the train (4) The train may not fall down inwards

Description : Railway tracks are banked on curves so that - (1) Necessary centrifugal force may be obtained from the horizontal component of the weight of the train (2) No frictional force may be produced between the ... the horizontal component of the weight of the train (4) The train may not fall down inwards

Last Answer : (3) Necessary centripetal force may be obtained from the horizontal component of the weight of the train

The component used for tuning a radio is basically a variable – (1) Resistor (2) Condenser (3) Inductor (4) Transformer

Description : The component used for tuning a radio is basically a variable – (1) Resistor (2) Condenser (3) Inductor (4) Transformer

Last Answer : (2) Condenser Explanation: A tuning capacitor or tuning condenser is a variable capacitor used in an electronic circuit of a radio. It usually connects in parallel to a loop antenna and its capacitance may be intentionally and repeatedly changed mechanically or electronically.

A component whose property changes when there is a change in any physical quantity of a device is A. processor B. sensoC. output deviceD. portable devicer

Description : A component whose property changes when there is a change in any physical quantity of a device is A. processor B. sensor C. output device D. portable device

Last Answer : sensor

Horizontal component of a bouncing ball is A. affected by gravityB. unaffected by gravityC. affected by weightD. affected by contact force

Description : Horizontal component of a bouncing ball is A. affected by gravity B. unaffected by gravity C. affected by weight D. affected by contact force

Last Answer : unaffected by gravity

Close inspection of a failed metal part reveals artifacts on the fracture surface commonly referred to as "striations" or "beach marks". This indicates the component failed as a result of: w) Sudden overloading x) Cyclical loading y) Stress corrosion cracking z) None of the above

Description : Close inspection of a failed metal part reveals artifacts on the fracture surface commonly referred to as "striations" or "beach marks". This indicates the component failed as a result of: w) Sudden overloading x) Cyclical loading y) Stress corrosion cracking z) None of the above

Last Answer : ANSWER: X -- CYCLICAL LOADING

For a point charge to feel a net force in a homogeneous magnetic field, which one of the following statements is true? The charge must: w) move parallel to the magnetic lines of flux x) have a component of its motion perpendicular to the lines of flux y) be stationary z) be a positive charge

Description : For a point charge to feel a net force in a homogeneous magnetic field, which one of the following statements is true? The charge must: w) move parallel to the magnetic lines of flux x) have a component of its motion perpendicular to the lines of flux y) be stationary z) be a positive charge

Last Answer : ANSWER: X -- HAVE A COMPONENT OF ITS MOTION PERPENDICULAR TO THE LINES OF FLUX 

A stone weighing 10 Newtons is sitting on the side of a hill that is at a 30o angle with the horizontal. What is the magnitude of the component of the stone's weight parallel to the side of the hill.

Description : A stone weighing 10 Newtons is sitting on the side of a hill that is at a 30o angle with the horizontal. What is the magnitude of the component of the stone's weight parallel to the side of the hill. 

Last Answer : ANSWER: 5 NEWTONS

After a projectile is fired horizontally near the earth's surface, the horizontal component of its velocity, neglecting any air resistance: w) increases steadily x) decreases steadily y) first decreases, then increases z) remains constant

Description : After a projectile is fired horizontally near the earth's surface, the horizontal component of its velocity, neglecting any air resistance: w) increases steadily x) decreases steadily y) first decreases, then increases z) remains constant

Last Answer : ANSWER: Z -- REMAINS CONSTANT 

During the motion of a projectile fired from the earth surface, _______ (1) its kinetic energy remains constant (2) its momentum remains constant (3) vertical component of its velocity remains constant (4) horizontal component of its velocity remains constant

Description : During the motion of a projectile fired from the earth surface, _______ (1) its kinetic energy remains constant (2) its momentum remains constant (3) vertical component of its velocity remains constant (4) horizontal component of its velocity remains constant

Last Answer : horizontal component of its velocity remains constant

Purpose of an optical filter is to (1) reflect lights of different colours (2) dispense light into component colours (3) refract light of different colours (4) transmit or absorb light of different colours

Description : Purpose of an optical filter is to (1) reflect lights of different colours (2) dispense light into component colours (3) refract light of different colours (4) transmit or absorb light of different colours

Last Answer :  transmit or absorb light of different colours

The component used for tuning a radio is basically a variable (1) Resistor (2) Condenser (3) Inductor (4) Transformer

Description : The component used for tuning a radio is basically a variable (1) Resistor (2) Condenser (3) Inductor (4) Transformer

Last Answer : Condenser

Railway tracks are banked on curves so that (1) Necessary centrifugal force may be obtained from the horizontal component of the weight of the train (2) No frictional force may be produced between the tracks and the wheels of the train (3) Necessary centripetal force may be obtained from the horizontal component of the weight of the train (4) The train may not fall down inwards

Description : Railway tracks are banked on curves so that (1) Necessary centrifugal force may be obtained from the horizontal component of the weight of the train (2) No frictional force may be produced between the ... the horizontal component of the weight of the train (4) The train may not fall down inwards

Last Answer : Necessary centripetal force may be obtained from the horizontal component of the weight of the train