What are the two types of circuit protection devices?

What are the two types of circuit protection devices?
by

1 Answer

Answer :

Fuses and circuit breakers
by

Related questions

What are the three types of circuit control devices?

Description : What are the three types of circuit control devices?

Last Answer : Switches, solenoids, and relays.

What are the three conditions that require circuit protection?

Description : What are the three conditions that require circuit protection?

Last Answer : A direct short, excessive current and excessive heat.

How are circuits protections devices connected to the circuit they are intended to protect and why are they connected in this way?

Description : How are circuits protections devices connected to the circuit they are intended to protect and why are they connected in this way?

Last Answer : In series, so total current will be stopped when the device opens.

What are the two types of metallic protection?

Description : What are the two types of metallic protection?

Last Answer : Sheath and armor

What two basic types of magnetic devices are used as error detectors?

Description : What two basic types of magnetic devices are used as error detectors?

Last Answer : E-transformer and control transformers.

State the nature of protection provided for following types of faults; 1) Over voltage 2) Under voltage 3) High air pressure in air circuit 4) Low air pressure in air circuit

Description : State the nature of protection provided for following types of faults; 1) Over voltage 2) Under voltage 3) High air pressure in air circuit 4) Low air pressure in air circuit

Last Answer : Ans:  1) Over voltage: Controlled through tap changing, only an alarm needs to be provided for attention of crew.  2) Under voltage: voltage below 17.5 kV is not desirable. A no volt ... 4) Low air pressure in air crcuit: Relay senses low pressure in air circuit and trips the relevant CB.

What are the electrical protection devices ?

Description : What are the electrical protection devices ?

Last Answer : A device used to protect various parts of an electrical circuit [such as wiring , electrical equipment connected to the circuit and other fittings] from being damaged or even consumed by excess current flowing ... ; ( C) Allows the user to disconnect the circuit from the power supply when required.

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

What types of diagrams are the most convenient from which to learn the basic Functions of a circuit?

Description : What types of diagrams are the most convenient from which to learn the basic Functions of a circuit?

Last Answer : Block or single-line diagram.

What are the three types of circuit breaker trip elements?

Description : What are the three types of circuit breaker trip elements?

Last Answer : Thermal, magnetic, and thermal-magnetic

What are the two most common semiconductor materials used in electronic and electro-optic devices?

Description : What are the two most common semiconductor materials used in electronic and electro-optic devices?

Last Answer : Silicon and gallium arsenide.

Ferrite devices are useful in microwave applications because they possess what properties?

Description : Ferrite devices are useful in microwave applications because they possess what properties?

Last Answer : Magnetic properties and high resistance

What is the name given to a variety of rotary electromechanical, position sensing devices?

Description : What is the name given to a variety of rotary electromechanical, position sensing devices?

Last Answer : The synchro.

What are the three networks used for frequency determining devices?

Description : What are the three networks used for frequency determining devices?

Last Answer : RC, LC, and crystal

Early analog computers were what type of devices?

Description : Early analog computers were what type of devices?

Last Answer : Mechanical or electromechanical.

What is the primary advantage of bulk-effect devices over normal pn-junction semiconductors?

Description : What is the primary advantage of bulk-effect devices over normal pn-junction semiconductors?

Last Answer : Larger microwave power outputs.

Computer-aided layout is used to prepare _______ devices.

Description : Computer-aided layout is used to prepare _______ devices.

Last Answer : Complex.

Why are disk storage devices popular?

Description : Why are disk storage devices popular?

Last Answer : Largely because of their direct access capabilities.

Why are disk storage devices popular?

Description : Why are disk storage devices popular?

Last Answer : Largely because of their direct access capabilities

Whenever data is transferred between devices, it involves the exchange of prearranged signals; what is this process called?

Description : Whenever data is transferred between devices, it involves the exchange of prearranged signals; what is this process called?

Last Answer : Handshaking.

Why are digital multimeters well suited for testing sensitive devices?

Description : Why are digital multimeters well suited for testing sensitive devices?

Last Answer : The current flow through the component is limited to 1 milliamp.

Why do electronic devices use amplifiers?

Description : Why do electronic devices use amplifiers?

Last Answer : To amplify the input signal to a usable level.

Why are shaded-pole motors used to drive only very small devices?

Description : Why are shaded-pole motors used to drive only very small devices?

Last Answer : They have very weak starting torques.

The wiring diagram for the motor starting circuit shown in the illustration indicates ______________. EL-0007 A. resistance starting B. reduced voltage starting C. low voltage protection D. low voltage release

Description : The wiring diagram for the motor starting circuit shown in the illustration indicates ______________. EL-0007 A. resistance starting B. reduced voltage starting C. low voltage protection D. low voltage release

Last Answer : Answer: C

Periodic testing of circuit breakers is necessary to assure that a correctly rated and properly installed unit _________________. A. can trip faster as it increases in age B. will continue to provide the original degree of protection C. does not exceed its interrupting capacity D. be able to withstand at least 125% of applied voltage

Description : Periodic testing of circuit breakers is necessary to assure that a correctly rated and properly installed unit _________________. A. can trip faster as it increases in age B. will continue to provide ... not exceed its interrupting capacity D. be able to withstand at least 125% of applied voltage

Last Answer : Answer: B

The circuit shown in the illustration represents a ________. EL-0090 A. battery charging circuit B. synchronous exciter C. depth sounding unit D. cathodic protection system

Description : The circuit shown in the illustration represents a ________. EL-0090 A. battery charging circuit B. synchronous exciter C. depth sounding unit D. cathodic protection system

Last Answer : Answer: D

Which of the listed items will stop a motor due to a reduction in voltage and restart it when the voltage is restored to normal? A. Low voltage protection circuit B. Non-renewable link fuse C. Renewable link fuse D. Low voltage release circuit

Description : Which of the listed items will stop a motor due to a reduction in voltage and restart it when the voltage is restored to normal? A. Low voltage protection circuit B. Non-renewable link fuse C. Renewable link fuse D. Low voltage release circuit

Last Answer : Answer: D

The purpose of a magnetic relay is to _____________. A. open a circuit only in the event of overload B. remotely open and close contacts C. provide overcurrent protection during starting D. relay voltages at increased power

Description : The purpose of a magnetic relay is to _____________. A. open a circuit only in the event of overload B. remotely open and close contacts C. provide overcurrent protection during starting D. relay voltages at increased power

Last Answer : Answer: B

The type of control circuit that will not permit automatic restarting after power is restored, following a power failure is called _____________. A. low voltage protection B. low voltage release C. overload lockout D. reduced voltage restart

Description : The type of control circuit that will not permit automatic restarting after power is restored, following a power failure is called _____________. A. low voltage protection B. low voltage release C. overload lockout D. reduced voltage restart

Last Answer : Answer: A

Fuses placed in series with a thermal trip-type circuit breaker are used for _____________. A. time-delay protection B. short-circuit protection C. short duration surge protection D. sustained overload protection

Description : Fuses placed in series with a thermal trip-type circuit breaker are used for _____________. A. time-delay protection B. short-circuit protection C. short duration surge protection D. sustained overload protection

Last Answer : Answer: B

The main difference between a motor control circuit containing low voltage protection and low voltage release is that the latter contains _____________. A. a magnetic operating coil B. normally open line contacts C. thermal-overload protection D. a momentary-contact start button

Description : The main difference between a motor control circuit containing low voltage protection and low voltage release is that the latter contains _____________. A. a magnetic operating coil B. normally open line contacts C. thermal-overload protection D. a momentary-contact start button

Last Answer : Answer: D

A low-voltage protection circuit is used in electric motor starting equipment to _____________. A. trip circuit contactors when the motor overspeeds due to low voltage B. trip circuit contactors when the motor develops a short circuit due to low voltage C. allow the motor to restart automatically on restoration of voltage without manually resetting D. prevent the motor from restarting automatically on restoration of voltage

Description : A low-voltage protection circuit is used in electric motor starting equipment to _____________. A. trip circuit contactors when the motor overspeeds due to low voltage B. trip circuit ... voltage without manually resetting D. prevent the motor from restarting automatically on restoration of voltage

Last Answer : Answer: D

Protection against sustained overloads occurring in molded-case circuit breakers is provided by a/an __________. A. overvoltage release B. thermal acting trip C. thermal overload relay D. current overload relay

Description : Protection against sustained overloads occurring in molded-case circuit breakers is provided by a/an __________. A. overvoltage release B. thermal acting trip C. thermal overload relay D. current overload relay

Last Answer : Answer: B

A molded-case circuit breaker provides protection against short circuits by using a/an ________________. A. electromagnet B. shading coil C. arc quencher D. burn away strip

Description : A molded-case circuit breaker provides protection against short circuits by using a/an ________________. A. electromagnet B. shading coil C. arc quencher D. burn away strip

Last Answer : Answer: A

Which of the following is the least expensive protection for overcurrent is low voltage system ? (a) Rewireable fuse (b) Isolator (c) Oil circuit breaker (d) Air break circuit breaker (e) None of the above

Description : Which of the following is the least expensive protection for overcurrent is low voltage system ? (a) Rewireable fuse (b) Isolator (c) Oil circuit breaker (d) Air break circuit breaker (e) None of the above

Last Answer : (a) Rewireable fuse

A thermal protection switch can protect against (a) short-circuit (b) temperature (c) overload (d) over voltage

Description : A thermal protection switch can protect against (a) short-circuit (b) temperature (c) overload (d) over voltage

Last Answer : (c) overload

Foldback current limiting has the advantage of A) Better pass transistor protection for long term overloads B) A defined turn on point C) Circuit simplicity D) All of the above.

Description : Foldback current limiting has the advantage of A) Better pass transistor protection for long term overloads B) A defined turn on point C) Circuit simplicity D) All of the above.

Last Answer : A) Better pass transistor protection for long term overloads

Which of the following is the demerit of a 'constant voltage transmission system' ? (a) Increase of short-circuit current of the system (b) Availability of steady voltage at all loads at the line terminals (c) Possibility of better protection for the line due to possible use of higher terminal reactants (d) Improvement of power factor at times of moderate and heavy loads (e) Possibility of carrying increased power for a given conductor size in case of long-distance heavy power transmission

Description : Which of the following is the demerit of a 'constant voltage transmission system' ? (a) Increase of short-circuit current of the system (b) Availability of steady voltage at all loads at ... of carrying increased power for a given conductor size in case of long-distance heavy power transmission

Last Answer : (a) Increase of short-circuit current of the system

Which of the following is the demerit of a 'constant voltage transmission system' ? (a) Increase of short-circuit current of the system (b) Availability of steady voltage at all loads at the line terminals (c) Possibility of better protection for the line due to possible use of higher terminal reactants (d) Improvement of power factor at times of moderate and heavy loads (e) Possibility of carrying increased power for a given conductor size in case of long-distance heavy power transmission

Description : Which of the following is the demerit of a 'constant voltage transmission system' ? (a) Increase of short-circuit current of the system (b) Availability of steady voltage at all loads at ... of carrying increased power for a given conductor size in case of long-distance heavy power transmission

Last Answer : (a) Increase of short-circuit current of the system

What is the purpose of Overload Protection in a motor circuit?

Description : What is the purpose of Overload Protection in a motor circuit?

Last Answer : Ans. The Overload Protection is used in a motor circuit to protect it from sustained over currents.

Explain with neat sketch overload protection for power circuit of locomotive.

Description : Explain with neat sketch overload protection for power circuit of locomotive.

Last Answer : Overload Protection for Power Circuit of Locomotive:  1. To protect the main power circuit from overload, the thermal overload relays are used. 2. The overload is sensed by the ... overload relay OLR3 operates for overload fault on traction motor due to the flashover of traction motors. 

Explain with necessary diagram the earth fault protection of power and auxiliary circuit.

Description : Explain with necessary diagram the earth fault protection of power and auxiliary circuit.

Last Answer : i) Earth fault protection for power circuit in Loco: When any earth fault occurs in the traction power circuit the fault current flows through the relay coil as the battery negative is ... temporarily by isolating the relay which connects the star point to earth through a high resistance.

Draw a neat sketch of earth fault protection of auxiliary circuit of electric loco. State the function of relay and isolating resistance.

Description : Draw a neat sketch of earth fault protection of auxiliary circuit of electric loco. State the function of relay and isolating resistance.

Last Answer : Ans: Earth fault protection for auxiliaries in Loco: Function of relay: The earth fault occurring anywhere in the auxiliary circuit gets monitored by the relay which acts to trip the main CB. Function of ... star point to earth through a high resistance so that the relay operation is avoided.

A series inductor is normally added in a thyrister circuit for achieving protection against:

Description : A series inductor is normally added in a thyrister circuit for achieving protection against:

Last Answer : A series inductor is normally added in a thyrister circuit for achieving protection against: high di/dt

A fuse in a motor circuit provides protection against?

Last Answer : A fuse in a motor circuit provides protection against short-circuit and overload.

What is the band of frequencies called that is included between the two points at which current falls to 70 percent of its maximum value in a resonant circuit?

Description : What is the band of frequencies called that is included between the two points at which current falls to 70 percent of its maximum value in a resonant circuit?

Last Answer : Bandwidth of the circuit

A two-cavity klystron without a feedback path will operate as what type of circuit?

Description : A two-cavity klystron without a feedback path will operate as what type of circuit?

Last Answer : Amplifier.

Name the two series circuits that exist in a diode circuit.

Description : Name the two series circuits that exist in a diode circuit.

Last Answer : Filament and plate.

A series circuit consists of two resistors in series. R1 = 25 ohms and R2 = 30 ohms. The circuit current is 6 amps. What is the (a) source voltage, (b) voltage dropped by each resistor, (c) total power, and (d) power used by each resistor?

Description : A series circuit consists of two resistors in series. R1 = 25 ohms and R2 = 30 ohms. The circuit current is 6 amps. What is the (a) source voltage, (b) voltage dropped by each resistor, (c) total power, and (d) power used by each resistor?

Last Answer : (a) 330 volts. (b) E1 = 150 volts. E2 = 180 volts. (c) 1.98 kilowatts. (d) P1 = 900 watts. P2 = 1.08 kilowatts component but in a parallel circuit total current divides among the available paths.