Description : To what standards should a technician restore electronic assemblies?
Last Answer : Manufacturer's standards.
Description : Which of the substances listed should be applied to battery terminals to help prevent corrosion? A. Zinc chromate B. Naval jelly C. Lead peroxide D. Petroleum jelly
Last Answer : Answer: D
Description : Which of the listed procedures should be carried out to prevent moisture damage to electrical apparatus during extended periods of idleness? A. Fill the motor housing with CO2 to inert the space. B. Strap ... C. Place heat lamps in the motor housings. D. Cover the equipment with a canvas tarpaulin.
Last Answer : Answer: C
Description : Which of the following procedures should be used to maintain a large electric motor during periods of inactivity? A. A thin layer of air-drying varnish should be applied on the windings. B. ... periodically to remove carbon dust. D. Space heaters should be used to prevent condensation of moisture.
Description : An electrostatic voltmeter in which an assembly of figure-8-shaped metal plates rotates between the plates of a stationary assembly when a voltage is applied betweeen the assemblies.
Last Answer : Kelvin voltmeter
Description : List two causes of damage to ESD-sensitive electronic components
Last Answer : Esd, improper stowage, and improper handling.
Description : In applications where electronic waveforms are displayed on a CRT screen, the input signal is normally applied to what CRT element?
Last Answer : The vertical-deflection plate.
Description : What structurally large, low-resistance conductor is connected in parallel with the meter movement to prevent damage?
Last Answer : Shunt.
Description : Before servicing the device indicated as 'A' in panels #1 and #3 of the illustration, the device labeled 'CT' must __________. EL-0003 A. have the disconnected leads taped to prevent ... D. have one lead grounded to discharge static electricity for the prevention of damage to electronic components
Description : When a solid-state component of an electronic circuit is mounted to a metallic mass, the general purpose of that mass is to ____________. A. prevent vibration damage to delicate components B. prevent ... damage to solid-state components C. dissipate stray magnetic currents D. act as a heat sink
Description : When troubleshooting electronic equipment, you should use a high impedance multimeter ________________. A. to prevent excess current flow through the meter that would damage it B. for AC measurements only ... being tested D. so as not to load down the circuit and obtain erroneous voltage readings
Description : The Modulus of Elasticity for a material refers to: w) the ability of a material to resist corrosion x) the ratio of stress over strain y) the maximum load over the cross sectional area z) none of the above
Last Answer : ANSWER: X -- THE RATIO OF STRESS OVER STRAIN
Description : What three things prevent a CT rotor from turning when voltages are applied to its stator windings?
Last Answer : The rotor is specially wound, it is never connected to an ac supply, and its output is always applied to a high-impedance load.
Description : Moisture in freon refrigeration system causes (a) ineffective refrigeration (b) high power consumption (c) freezing automatic regulating valve (d) corrosion of whole system
Last Answer : Ans: c
Description : Aluminum is a very light metal which resists a) scratch b) moisture c) temperature d) corrosion
Last Answer : d) corrosion
Description : Why it is sometimes necessary to preheat the base material before welding? a) To remove oil and grease b) To remove moisture from inside the material c) To prevent the possible risk of cracking d) Not required if using cellulosic electrodes as these will provide enough heat
Last Answer : c) To prevent the possible risk of cracking
Description : Material used inside the breather to prevent moisture entering the transformer is
Last Answer : Material used inside the breather to prevent moisture entering the transformer is silica gel
Description : Ceramic nuclear metals compared to solid nuclear metals have (A) Higher melting points (B) Low strength at high temperature (C) More chances of radiation damage (D) Poorer corrosion resistance
Last Answer : (A) Higher melting points
Description : Damage to metal surface by mechanical action is called (A) Pitting (B) Corrosion (C) Erosion (D) None of these
Last Answer : Option C
Description : Is it true Elastic deformation occurs when a material deforms as stress is applied?
Last Answer : Yes
Description : Pick out the correct statement. (A) Stainless steel is nothing but chromium coated steel (B) Hardening of a soft metal can be done by alloying it with another metal or non-metal (C) ... its temporary distortion under the action of applied stress (D) Rusting of iron is not electrochemical in nature
Last Answer : (B) Hardening of a soft metal can be done by alloying it with another metal or non-metal
Description : Stress concentration is caused due to A. Variation in properties of material from point to point in a member B. Pitting at points or areas at which loads on a member are applied C. Abrupt change of section D. All of the above
Last Answer : D. All of the above
Description : Moisture damage, as a result of condensation occurring inside of the cargo winch master switches, can be reduced by __________________. A. installing a light bulb in the pedestal stand B. coating the ... epoxy sealer C. venting the switch box regularly D. using strip heaters inside the switch box
Description : Stored grains can be saved from insect damage, if the grain moisture content is — (A) 10% (C) 10% (D) None of these
Last Answer : (C) 10%
Description : In order to prevent the corrosion of iron pipes they are often coated with a layer of zinc. This process is termed as: A. Electroplating B. Annealing C. Galvanization D. Vulcanization
Last Answer : ANSWER: C
Description : In order to prevent the corrosion of iron pipes, they are often coated with a layer of zinc. This process is termed as (a) electroplating (b) annealing (c) galvanization (d) vulcanization
Last Answer : Ans:(c)
Description : The process of covering water pipes made of Iron with Zinc layer to prevent corrosion is called – (1) Zinc plating (2) Alloy formation (3) Vulcanization (4) Galvanization
Last Answer : (4) Galvanization Explanation: Galvanization is the process of applying a protective zinc coating to steel or iron, in order to prevent rusting.
Description : The purpose of an impressed current cathodic protection system aboard ship is to _______________. A. prevent corrosion of the hull, propeller, rudder and line shafting B. neutralize the vessel's ... the presence of salt air D. maintain a minimum constant alternator load to prevent overheating
Last Answer : Answer: A
Description : __________ is added in stainless steel to prevent inter crystal corrosion. (A) Vanadium (B) Niobium (C) Chromium (D) Nickel
Last Answer : (B) Niobium
Description : In order to prevent the corrosion of iron pipes they are often coated with a layer of zinc. This process is termed as------? A. Electroplating B. Annealing C. Galvanization (Answer) D. Vulcanization
Last Answer : C. Galvanization (Answer)
Description : In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used (A) In low range of temperature differences (B) In high range of temperature differences (C) Because of its low cost (D) To prevent corrosion of the tube bundles
Last Answer : (B) In high range of temperature differences
Description : Presence of a certain minimum quantity of fluorine is desirable in potable water to prevent (A) Dental cavities (B) Scale formation (C) Water-borne disease (D) Corrosion
Last Answer : (A) Dental cavities
Description : . Plasticisers are added to paints to (A) Make it corrosion resistant (B) Make glossy surface (C) Give elasticity & prevent cracking of the film (D) Increase atmospheric oxidation
Last Answer : (C) Give elasticity & prevent cracking of the film
Description : . Carboxymethyl cellulose (CMC) is added in detergents to (A) Prevent redeposition of soil on cleaned surface (B) Act as optical brightening agent (C) Inhibit corrosion in washing machines made of aluminium (D) None of these
Last Answer : (A) Prevent redeposition of soil on cleaned surface
Description : The process of covering water pipes made of Iron with Zinc layer to prevent corrosion is called : (1) Zinc plating (2) Alloy formation (3) Vulcanization (4) Galvanization
Last Answer : Galvanization
Description : The asbestos cement sewers are A. Light in weight B. Not structurally strong to bear large compressive stress C. Susceptible to corrosion by sulphuric acid D. All the above
Last Answer : ANS: D
Description : The objective of caulking in a riveted joint is to make the joint (A) Free from corrosion (B) Stronger in tension (C) Free from stress (D) Leak-proof
Last Answer : (D) Leak-proof
Description : Identify the false statement (A) Martensitic steels are less susceptible to pitting corrosion than austenitic steels (B) Pitting corrosion is usually very localised (C) Hydrogen embrittlement is facilitated by tensile stress (D) Stress corrosion cracking is facilitated by tensile stress
Last Answer : (A) Martensitic steels are less susceptible to pitting corrosion than austenitic steels
Description : Which of the following is an example of stress corrosion? (A) Season cracking of brass (B) Caustic embrittlement of steel (C) Both (A) & (B) (D) Neither (A) nor (B)
Description : What phenomenon will result if the glass fiber is exposed to long periods of high humidity? ∙ A. stress fatigue ∙ B. core corrosion ∙ C. stress corrosion ∙ D. cladding corrosion
Last Answer : stress corrosion
Description : What steps can be taken to avoid stress corrosion cracking (SCC) in steel vessels used for storing anhydrous ammonia?
Last Answer : The U.S. National Board of Pressure Vessel Inspectors recommends the following in one of their classic articles: 1. Pressure vessels should be fully stress relieved or fabricated with heads that ... at least 0.2 percent water to inhibit SCC. Source: National Board of Pressure Vessel Inspectors
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
Description : Are there any electronic gadgets available that measure moisture and other soil factors in a garden?
Last Answer : Yes there is the HQRP 4-Pin Moisture Analizer Gauge Tester.
Description : Which of the following statements describes the significance of ambient temperature in relation to the service life of electronic components? A. Ambient temperature should be as high as possible to drive ... is kept low. D. A reduced ambient temperature causes a corresponding reduced service life.
Last Answer : Answer: B
Description : The internal molecular attraction of a soil, the cohesion (A) Decreases as the moisture content increases (B) Increases as the moisture content decreases (C) Is more in well compacted clays (D) Depends upon the external applied load
Last Answer : Answer: Option C
Description : The main purpose of an electric space heater installed in a large AC generator is to _____________. A. keep the lube oil warm for quick starting B. prevent moisture from condensing in the ... is shutdown C. prevent the windings from becoming brittle D. prevent acidic pitting of the slip rings
Description : Which of the listed devices may be installed on a large diesel-electric alternating current propulsion generator? A. Temperature detector coils inserted in the stator slots for measuring stator temperature. B. ... . C. Electric space heaters to prevent condensation of moisture. D. All of the above.
Description : The main purpose of an electric space heater installed in a large AC generator is to _____________. A. prevent the windings from becoming brittle B. prevent moisture from condensing in the windings during ... C. prevent acidic pitting of the slip rings D. keep the lube oil warm for quick starting
Description : Electric strip heaters are used in motor controllers to _____________. A. prevent freezing of movable contacts B. keep the components at their design ambient temperature C. prevent condensation of moisture D. minimize resistance in internal circuits
Description : Which of the following precautions should you take when securing propulsion generators and motors for an extended period of time? A. Disconnect the brush pigtails from their contacts and circulate air ... Lift the brushes from commutator collector rings and circulate cool dry air through the units.