What is a normal indication on a megger when checking insulation?

What is a normal indication on a megger when checking  insulation?
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Infinity.
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Related questions

What is the normal indication on a megger when checking insulation?

Description : What is the normal indication on a megger when checking insulation?

Last Answer : infinity

What is the procedure for using a megger to check the insulation of a conductor?

Description : What is the procedure for using a megger to check the insulation of a conductor?

Last Answer : Connect one lead to the insulation and one lead to the conductor. Turn the handcrank until it starts to slip. Note the reading

Which of the conditions listed will indicate the need to clean the insulation on the windings of an electric motor? A. Higher than normal operating temperature. B. Excessive vibration at normal speed. C. Sparking at the brushes. D. High megger readings.

Description : Which of the conditions listed will indicate the need to clean the insulation on the windings of an electric motor? A. Higher than normal operating temperature. B. Excessive vibration at normal speed. C. Sparking at the brushes. D. High megger readings.

Last Answer : Answer: A

When troubleshooting motor controllers, a shorted relay or contactor coil is often indicated by _______________. A. a resistance reading of 'infinity' on an ohmmeter B. charred insulation and/or a blown control fuse C. a reading of 'zero' on a megger from one of the coil's leads to ground D. a higher-than-normal voltage reading across the winding

Description : When troubleshooting motor controllers, a shorted relay or contactor coil is often indicated by _______________. A. a resistance reading of 'infinity' on an ohmmeter B. charred insulation and/or a blown ... of the coil's leads to ground D. a higher-than-normal voltage reading across the winding

Last Answer : Answer: B

A useful instrument for checking A.C. motor performance by measuring possible unbalanced currents is the _____________. A. hand or battery-operated megger B. vibrating-reed frequency meter C. hook-on voltmeter-ammeter D. D'Arsonval iron-vane probe

Description : A useful instrument for checking A.C. motor performance by measuring possible unbalanced currents is the _____________. A. hand or battery-operated megger B. vibrating-reed frequency meter C. hook-on voltmeter-ammeter D. D'Arsonval iron-vane probe

Last Answer : Answer: C

The electrician reports to you that he has obtained low (but above 1 megohm) megger readings on the windings of a deck winch motor. Upon checking the records of that motor, you find the readings have consistently been at that level for the last six yea A. motor be replaced B. windings be dried C. windings be cleaned D. readings are acceptable

Description : The electrician reports to you that he has obtained low (but above 1 megohm) megger readings on the windings of a deck winch motor. Upon checking the records of that motor, you find the readings have ... yea A. motor be replaced B. windings be dried C. windings be cleaned D. readings are acceptable

Last Answer : Answer: D

As a general rule, the first troubleshooting action to be taken in checking faulty electric control devices is to _____________. A. draw a one line diagram of the circuitry B. test all fuses and measure the line voltage C. take megger readings D. insulate the apparatus from ground

Description : As a general rule, the first troubleshooting action to be taken in checking faulty electric control devices is to _____________. A. draw a one line diagram of the circuitry B. test all fuses and measure the line voltage C. take megger readings D. insulate the apparatus from ground

Last Answer : Answer: B

Routine maintenance of dry-type transformers should include ______________. A. preventing the entrance of water from broken pipe lines steam lines B. keeping protective surfaces and insulating bushings free of dirt and conductive debris C. periodic testing of insulation resistance with a megger D. all of the above

Description : Routine maintenance of dry-type transformers should include ______________. A. preventing the entrance of water from broken pipe lines steam lines B. keeping protective surfaces and insulating bushings free of ... debris C. periodic testing of insulation resistance with a megger D. all of the above

Last Answer : Answer: D

Which of the listed conditions could indicate the need for cleaning electrical insulation? A. Low ambient temperature B. Low operating temperature C. High dielectric strength D. Low megger readings

Description : Which of the listed conditions could indicate the need for cleaning electrical insulation? A. Low ambient temperature B. Low operating temperature C. High dielectric strength D. Low megger readings

Last Answer : Answer: D

The need for insulation cleaning may be determined by _____. A. visual inspection for dirt accumulation B. high megger readings C. low operating temperature D. the time period since the last cleaning

Description : The need for insulation cleaning may be determined by _____. A. visual inspection for dirt accumulation B. high megger readings C. low operating temperature D. the time period since the last cleaning

Last Answer : Answer: A

Electrical machinery insulation will break down more rapidly due to _________________. A. low loading of motors and generators B. frequent megger testing C. high temperatures and vibration D. high operating frequencies

Description : Electrical machinery insulation will break down more rapidly due to _________________. A. low loading of motors and generators B. frequent megger testing C. high temperatures and vibration D. high operating frequencies

Last Answer : Answer: C

Routine maintenance of a ship's service alternator should include ______________. A. changing the pedestal bearing insulation yearly B. megger testing of all rectifying diodes C. lubricating excitation slip rings D. periodic cleaning of the air filters or screens

Description : Routine maintenance of a ship's service alternator should include ______________. A. changing the pedestal bearing insulation yearly B. megger testing of all rectifying diodes C. lubricating excitation slip rings D. periodic cleaning of the air filters or screens

Last Answer : Answer: D

A generator has been exposed to water and is being checked for its safe operation. Therefore, it is necessary to _______________. A. check for shorted coils with a growler B. take moisture readings with a hydrometer C. test insulation values with a megger D. ground the commutator, or slip rings and run it at half load for 12 hours

Description : A generator has been exposed to water and is being checked for its safe operation. Therefore, it is necessary to _______________. A. check for shorted coils with a growler B. take moisture readings with a ... a megger D. ground the commutator, or slip rings and run it at half load for 12 hours

Last Answer : Answer: C

Why is a Megger used for insulation test and not a multi meter?

Description : Why is a Megger used for insulation test and not a multi meter?

Last Answer : With a megger,a voltage of not less than 500 volts DC is used for testing the insulation resistance of windings. With a multi-meter, the voltage used is not more than 3-volts DC. Megger uses high impedance testing and is therefore more accurate than a multi-meter

A megger is to measure insulation resistance of a cable. The cable should be connected to

Description : A megger is to measure insulation resistance of a cable. The cable should be connected to   (a) Battery (b) DC supply (c) AC supply (d) No supply  

Last Answer : majorly in DC as well as AC......but ans is Battery

To measure insulation resistance of equipments of voltage rating upto 440 V the megger generator must generate...

Description : To measure insulation resistance of equipments of voltage rating upto 440 V the megger generator must generate   (a) 220 V (b) 440 V (c) 500 V (d) None of these 

Last Answer : 500 V

An Operator Tells You That Flow Indication Is More? How Would You Start Checking?

Description : An Operator Tells You That Flow Indication Is More? How Would You Start Checking?

Last Answer : 1. First flushing the transmitter. Flush both the impulse lines. Adjust the zero by equalizing if necessary. If still the indication is more then. 2. Check L.P. side for choke. If that is clean then. 3. Check the leaks on L.P. side. If not. 4. Calibrate the transmitter.

An operator tells you that flow indication is more, How would you start checking?

Description : An operator tells you that flow indication is more, How would you start checking?

Last Answer : First flushing the transmitter. Flush both the impulse lines. Adjust the zero by equalizing if necessary. If still the indication is more then. • Check L.P. side for choke. If that is clean then. • Check the leaks on L.P. side. If not. • Calibrate the transmitter.

List the four safety precautions observed when using a megger.

Description : List the four safety precautions observed when using a megger.

Last Answer : a. Use meggers for high-resistance measurement only. b. Never touch the test leads when the handle is being cranked. c. Deenergize and discharge the circuit completely before connecting a megger. d. Disconnect the item being checked from other circuitry, if possible, before using a megger

What is the primary use of a megger?

Description : What is the primary use of a megger?

Last Answer : To measure high resistance.

What method for checking transistors is cumbersome when more than one transistor is bad in a circuit?

Description : What method for checking transistors is cumbersome when more than one transistor is bad in a circuit?

Last Answer : The substitution method.

When checking a diode with an ohmmeter, what is indicated by two high resistance measurements?

Description : When checking a diode with an ohmmeter, what is indicated by two high resistance measurements?

Last Answer : The diode is open or has a high-forward resistance.

List the safety precautions to be observed when checking fuses.

Description : List the safety precautions to be observed when checking fuses.

Last Answer : Turn the power off and discharge the circuit before you remove fuses. Use a fuse puller (an insulated tool) when you remove fuses d. Not acceptable-lower voltage rating e. Direct replacement

You have just checked a 1/500-ampere fuse with an ohmmeter and find it is open. Checking the replacement fuse shows the replacement fuse is open also. Why would the replacement fuse indicate open?

Description : You have just checked a 1/500-ampere fuse with an ohmmeter and find it is open. Checking the replacement fuse shows the replacement fuse is open also. Why would the replacement fuse indicate open?

Last Answer : The ohmmeter causes more than 1/500 ampere through the fuse when you check the fuse, thus it opens the fuse.

What stripping tool would NOT be used to strip glass braid insulation?

Description : What stripping tool would NOT be used to strip glass braid insulation?

Last Answer : Hot-blade stripper.

What materials are commonly used as cushions between cable insulation and metallic armor?

Description : What materials are commonly used as cushions between cable insulation and metallic armor?

Last Answer : Jute and Asphalt coverings.

State the reasons that the Navy is getting away from the use of asbestos insulation.

Description : State the reasons that the Navy is getting away from the use of asbestos insulation.

Last Answer : Breathing asbestos fibers can cause lung disease and/or cancer

Define insulation resistance.

Description : Define insulation resistance.

Last Answer : The resistance to current leakage through the insulation.

If the insulation of a conductor was being measured in figure1-51 (A), would the reading indicate a good insulation?

Description : If the insulation of a conductor was being measured in figure1-51 (A), would the reading indicate a good insulation?

Last Answer : Yes.

What instrument is used for measuring the insulation resistance of cables?

Description : What instrument is used for measuring the insulation resistance of cables?

Last Answer : Megohmmeter (megger).

Sparking at the brushes of a running motor could be an indication of _____________. A. normal operation B. a dirty commutator C. increased brush capacity D. water vapor absorption

Description : Sparking at the brushes of a running motor could be an indication of _____________. A. normal operation B. a dirty commutator C. increased brush capacity D. water vapor absorption

Last Answer : Answer: B

Which of the following conditions indicates a short circuited capacitor when checking its condition with an ohmmeter? A. The capacitor shows charging, but the final resistance reading is appreciably less than normal. B. The reading is practically zero and remains there. C. The capacitor shows no charging action, but indicates a very high resistance. D. The pointer moves quickly to the low resistance side of the scale, then slowly recedes toward infinity.

Description : Which of the following conditions indicates a short circuited capacitor when checking its condition with an ohmmeter? A. The capacitor shows charging, but the final resistance reading is appreciably less ... moves quickly to the low resistance side of the scale, then slowly recedes toward infinity.

Last Answer : Answer: B

While giving CPR which of the following is considered: a. It achieves 30% of cardiac output with 60 compressions per minute. b. It achieves normal blood oxygen levels with 12 reseparations per minute. c. You have to check compression point by thumbing before starting compression. d. Cardiac output has to be monitored regularly by checking radial pulse.

Description : While giving CPR which of the following is considered: a. It achieves 30% of cardiac output with 60 compressions per minute. b. It achieves normal blood oxygen levels with 12 reseparations ... starting compression. d. Cardiac output has to be monitored regularly by checking radial pulse.

Last Answer : c. You have to check compression point by thumbing before starting compression.

While giving CPR which of the following is correct: A. It achieves 30% of cardiac output with 60 compressions per minute B. It achieves normal blood oxygen levels with 12 reseparations per minute C. You have to check compression point by thumping before starting compression D. Cardiac output has to be monitored regularly by checking radial pulse.

Description : While giving CPR which of the following is correct: A. It achieves 30% of cardiac output with 60 compressions per minute B. It achieves normal blood oxygen levels with 12 ... thumping before starting compression D. Cardiac output has to be monitored regularly by checking radial pulse.

Last Answer : C. You have to check compression point by thumping before starting compression

The reading at 'M' on the megger scale illustrated, is ____. EL-0044 A. 7.1 meg ohms B. 71 meg ohms C. .71 meg ohms D. 200,000,000 ohms

Description : The reading at 'M' on the megger scale illustrated, is ____. EL-0044 A. 7.1 meg ohms B. 71 meg ohms C. .71 meg ohms D. 200,000,000 ohms

Last Answer : Answer: A

When testing for blown fuses in a three-phase supply circuit to a motor, you should first ___________________. A. apply the megger across the tops of the line fuses B. apply an ammeter diagonally across the top of the first line fuse and the bottom of the third line fuse C. apply the voltage tester across the bottoms of the line fuses D. ensure the circuit is de-energized, and then use a continuity tester

Description : When testing for blown fuses in a three-phase supply circuit to a motor, you should first ___________________. A. apply the megger across the tops of the line fuses B. apply an ammeter diagonally across ... of the line fuses D. ensure the circuit is de-energized, and then use a continuity tester

Last Answer : Answer: D

The reading at 'M' on the megger scale shown in the illustration, is __________. EL-0044 A. 7.1 meg ohms B. .71 meg ohms C. 71 meg ohms D. 200,000,000 ohms

Description : The reading at 'M' on the megger scale shown in the illustration, is __________. EL-0044 A. 7.1 meg ohms B. .71 meg ohms C. 71 meg ohms D. 200,000,000 ohms

Last Answer : Answer: A

The reading at 'Z' on the megger scale shown in the illustration is ____________. EL-0044 A. 30,000 ohms B. 300,000 ohms C. 3,000,000 ohms D. 30,000,000 ohms

Description : The reading at 'Z' on the megger scale shown in the illustration is ____________. EL-0044 A. 30,000 ohms B. 300,000 ohms C. 3,000,000 ohms D. 30,000,000 ohms

Last Answer : Answer: C

The reading at 'K' on the megger scale shown in the illustration, is ______________. EL-0044 A. 400 ohms B. 4,000 ohms C. 40,000 ohms D. 400,000 ohms

Description : The reading at 'K' on the megger scale shown in the illustration, is ______________. EL-0044 A. 400 ohms B. 4,000 ohms C. 40,000 ohms D. 400,000 ohms

Last Answer : Answer: D

The reading at 'C' on the megger scale illustrated, is ________. EL-0044 A. 200,000 ohms B. 2,000,000 ohms C. 20,000,000 ohms D. 200,000,000 ohms

Description : The reading at 'C' on the megger scale illustrated, is ________. EL-0044 A. 200,000 ohms B. 2,000,000 ohms C. 20,000,000 ohms D. 200,000,000 ohms

Last Answer : Answer: C

The reading at 'V' on the megger scale shown in the illustration, is __________. EL-0044 A. 40 meg ohms B. 0.40 meg ohms C. 4.0 kilo ohms D. 40,000 ohms

Description : The reading at 'V' on the megger scale shown in the illustration, is __________. EL-0044 A. 40 meg ohms B. 0.40 meg ohms C. 4.0 kilo ohms D. 40,000 ohms

Last Answer : Answer: D

The reading at 'P' on the megger scale shown in the illustration, is __________. EL-0044 A. 15 meg ohms B. 1.5 meg ohms C. 1.5 kilo ohms D. 150,000 ohms

Description : The reading at 'P' on the megger scale shown in the illustration, is __________. EL-0044 A. 15 meg ohms B. 1.5 meg ohms C. 1.5 kilo ohms D. 150,000 ohms

Last Answer : Answer: B

Discharge switches are often located on hand-driven meggers. The purpose of these switches is to discharge capacitive charges stored in the _____________. A. megger hand generator B. megger movement coils C. tested equipment while conducting test D. tested equipment after testing

Description : Discharge switches are often located on hand-driven meggers. The purpose of these switches is to discharge capacitive charges stored in the _____________. A. megger hand generator B. megger movement coils C. tested equipment while conducting test D. tested equipment after testing

Last Answer : Answer: D

If the pointer on a megger fails to return to 'zero' when not being used, the _____________. A. megger is out of calibration B. megger is operating normally C. hairsprings are burned out D. pointer probably stuck in that position

Description : If the pointer on a megger fails to return to 'zero' when not being used, the _____________. A. megger is out of calibration B. megger is operating normally C. hairsprings are burned out D. pointer probably stuck in that position

Last Answer : Answer: B

A suspected 'open' in a motor field can be tested by using a/an ____________. A. potentiometer B. megger C. wattmeter D. ammeter

Description : A suspected 'open' in a motor field can be tested by using a/an ____________. A. potentiometer B. megger C. wattmeter D. ammeter

Last Answer : Answer: B

To determine if a stator coil is grounded, you should use a/an _____________. A. ammeter B. ground detection lamp C. magneto D. megger

Description : To determine if a stator coil is grounded, you should use a/an _____________. A. ammeter B. ground detection lamp C. magneto D. megger

Last Answer : Answer: D

If the pointer fails to return to zero when a megger is disconnected, the _____________. A. pointer is stuck B. hair springs are burned out C. megger is out of calibration D. megger is operating normally

Description : If the pointer fails to return to zero when a megger is disconnected, the _____________. A. pointer is stuck B. hair springs are burned out C. megger is out of calibration D. megger is operating normally

Last Answer : Answer: D