Description : The burden value in Potential Transformer (PT) should be ______ to achieve low errors in PT: A) low B) high C) medium D) infinite
Last Answer : The burden value in Potential Transformer (PT) should be high to achieve low errors in PT:
Description : As shown in the illustration, a 'pitch cutback' feature is incorporated in the system. This circuit reduces pitch amount to prevent engine overload when it senses ____________. EL-0095 A. pitch error of ... servo' C. excessive propeller speed or fuel to either engine D. only one engine on the line
Last Answer : Answer: C
Description : Which technique can be used to achieve input and output coverage? It can be applied to human input, input via interfaces to a system, or interface parameters in integration testing. A. Error Guessing B. Boundary Value Analysis C. Decision Table testing D. Equivalence partitioning
Last Answer : D. Equivalence partitioning
Description : Which technique can be used to achieve input and output coverage? It can be applied to human input, input via interfaces to a system, or interface parameters in integration testing. a) Error Guessing b) Boundary Value Analysis c) Decision Table testing d) Equivalence partitioning
Last Answer : d) Equivalence partitioning
Description : What is Value Added Tax (VAT)? (1) A simple, transparent, easy to pay tax imposed on consumers (2) A new initiative taken by the Government to increase the tax-burden of high income groups (3) A ... like, surcharge, turnover tax, etc. (4) A new tax to be imposed on the producers of capital goods
Last Answer : (3) A single tax that replaces State taxes like, surcharge, turnover tax, etc. Explanation: A value added tax (VAT) is a form of consumption tax. A VAT is like a sales tax in that ... under the single tax system based primarily or exclusively on one tax, typically chosen for its special properties.
Description : What is Value Added Tax (VAT) ? (1) A simple, transparent, easy to pay tax imposed on consumers (2) A new initiative taken by the Government to increase the tax-burden of high income groups (3) A ... like, surcharge, turnover tax, etc. (4) A new tax to be imposed on the producers of capital goods
Last Answer : A single tax that replaces State taxes like, surcharge, turnover tax, etc.
Description : Erratic operation of the devices represented in the diagrams shown in the illustration could be traced to ____________. EL-0092 A. improper contact at 'R' slip rings or 'S' connections B. a low three- ... . improper contact at 'S' slip rings or 'R' connections D. a high three-phase voltage supply
Last Answer : Answer: A
Description : If both the 'high level' and 'low level' alarms come on for the same address of a centralized control console, the most likely problem is a/an ____________. A. sensor failure B. failed alarm C. low level D. extremely high level
Description : Operational amplifiers, used primarily in analog circuits, are characterized by ____________. A. high input impedance, high gain and low output impedance B. high input impedance, high gain and high output ... gain and high output impedance D. low input impedance, high gain and low output impedance
Description : The final step in testing a circuit for a ground involves the use of a megohmmeter. A grounded switch or cable will be indicated by a megohmmeter reading of ____________. A. 'zero' B. infinity C. steady in the high range D. unsteady in the low range
Description : The purpose of a short circuit forcing module (short time trip) installed in a branch line is to provide ____________. A. high speed clearance of low impedance short circuits in the branch B. ... C. isolation of short circuits by selective tripping of branch circuit breakers D. all of the above
Last Answer : Answer: D
Description : Point out the correct statement. a) Except for tightly managed SaaS cloud providers, the burden of resource management is still in the hands of the user b) Cloud computing vendors run very reliable ... barrier to entry cannot be accompanied by a low barrier to provisioning d) All of the mentioned
Last Answer : Cloud computing vendors run very reliable networks
Description : . ____________ refers to distributed computing, in which a group of computers from multiple locations are connected with each other to achieve a common objective. A. Virtualization B. SOA C. Grid Computing D. Utility Computing Ans : C
Last Answer : . Grid Computing
Description : The main disadvantage of 'Radio' as an Advertisement medium is ____________ 1. No visual information 2. Narrow coverage 3. High cost 4. All of these 5. None of these
Last Answer : No visual information
Description : Which performance parameter is the minimum amount of optical power required to achieve a specific bit-error rate (BER) in digital systems or a given signal-to-noise ratio (SNR) in analog systems?
Last Answer : Receiver sensitivity.
Description : The ground detection system, shown in the illustration for a low-voltage, threephase system has a ground in line 'A'. Therefore, lamp 'A' will burn ____________. EL-0009 A. dimly or be out, and lamps 'B' and ... and 'C' will burn dimly or be out D. brightly, and lamps 'B' and 'C' will burn normally
Description : An open occurring within the field rheostat of an AC generator can be detected by short circuiting its terminals and observing a ____________. A. negative deflection of the wattmeter pointer B. ... of the wattmeter pointer C. buildup of alternator voltage D. low, but constant alternator voltage
Description : Moisture accumulating in electric motors and generator windings having a cold insulation resistance greater than 50,000 ohms may be baked out with internal heat. This heat can be developed by ____________. ... an electric welder and feeding it into the armature while running the motor at full speed
Description : An open armature connection in a DC propulsion motor could be caused by ____________. A. low-load operation B. clogged ventilation ducts C. sparking at the brushes D. a grounded shunt field coil
Last Answer : Answer: B
Description : When insulation failure produces a low resistance current path between two conductors, the resulting condition is known as ____________. A. an open B. a short circuit C. a ground D. a surge
Description : Undervoltage trips are frequently installed on switchboard circuit breakers to trip ____________. A. out generators in the event of severe arcing or sparking B. out generators when there is reversal of power ... , but continues to run D. out generators when there is low voltage in the main circuit
Description : A megohmmeter is connected to each end of an individual motor winding. A low ohm reading indicates ____________. A. an open coil B. a loose coil C. good continuity D. a dirty coil
Description : When you check the specific gravity of the battery electrolyte with a hydrometer, it should be kept in mind that ____________. A. the battery is fully charged when the indicator floats low in ... taken immediately after water is added to the cell D. temperature has no effect on hydrometer readings
Description : Humming or buzzing of electric contacts is a symptom of ____________. A. low voltage on the operating coil B. power failure to the operating coil C. a control circuit ground D. a control circuit overload
Description : To test fuses in an energized circuit, you should use a ____________. A. low voltage light bulb B. megohmmeter C. voltmeter D. resistance meter
Description : When using an ohmmeter to test a semiconductor diode, you find a low resistance in both the forward and reverse bias directions. This indicates that the diode has a/an ____________. A. open B. short C. good resistive quality D. good capacitive quality
Description : Although saturable reactors are extremely useful in some applications, their gain is low because of ____________. A. core hysteresis losses B. inductive reactance in the control winding C. IR drop throughout the load winding D. all of the above
Description : Routine maintenance of dry-type transformers should include ____________. A. cleaning the windings, if accessible, with a vacuum cleaner or very low pressure air B. measuring and recording the winding ... . making sure that the units are close to bulkheads or corners to protect them from damage
Description : An accidental path of low resistance, allowing passage of abnormal amount of current is known as a/an ____________. A. open circuit B. short circuit C. polarized ground D. ground reference point
Description : Difference between Current Transformer (CT) and Potential Transformer (PT)
Last Answer : Current Transformers (CT) and Potential Transformers (PT) are used to measure the current and voltage in a circuit of the order of hundreds of amperes and volts respectively. A CT has large number of ... and flux density vary over a wide range whereas in PT, they vary over a limited range only
Description : What are the checks on CT & PT?
Last Answer : a) Polarity checks b) Insulation checks c) Ratio checks d) Knee point voltage (only for PS class CT)- magnetising characteristic test.
Description : What is the purpose of CT & PT?
Last Answer : For transformation of current, voltage to a lower level for the purpose of Measurement, Protection and Control.
Description : Why PT fuse fails protection?
Last Answer : Mho relays will mal-operate if PT voltage is lost to the relay, so tripping blocked by sensing PT fuse failure.
Description : What is the equation for resistance measurement of PT 100 thermocouple?
Last Answer : °C = (R-100) / 0.39
Description : What is the rating of generator PT fuse?
Last Answer : 24 kV, 3.15 Amps.
Description : Why AVR changes over to manual on AVR PT fuse failure?
Last Answer : Because loss of feedback to voltage corrector.
Description : What is the difference between PT and normal transformer?
Last Answer : Burden of PT is less and burden of normal transformer is high.
Description : Draw a neat sketch and explain the use of CT and PT for measurement of power in a single-phase circuit?
Last Answer : If wattmeter of proper range is not available or if voltage and current ranges are high we can usr CT and PT of suitable ratio. Connect the CT and PT as shown in figure. The reading of wattmeter can be multiplied by the ratio to get the actual power.
Description : The boundary of the protective zone is determined by the (A) Location of CT (B) sensitivity of relay used (C) Location of PT (D) None of these
Last Answer : Ans: B The boundary of the protective zone is determined by the sensitivity of relay used. If the relay is more sensitive, the protective zone will be increased.
Description : If overloading a DC machine becomes necessary in an emergency, you should ____________. A. cool the machine with portable blowers and fans B. hold thermal overload relays open with blocks of ... the windings for cooling D. increase the residual magnetism value of windings to reduce eddy currents
Description : If the electricity represented by the wave form in 'B' were applied to the left side of the illustrated circuit, the output on the right side would be ____________. EL-0064 A. direct current with the ... lower lead D. clipped to a value equal to the square root of 3 times the input voltage value
Description : You are testing the insulation in an AC generator with a megohmeter. The resistance value of a dry, clean winding will ____________. A. continue to rise as the test potential is maintained, ... fairly steady after 5 to 7 minutes D. stabilize after approximately 2 to 4 minutes of fluctuation
Description : In the illustration, moving the engine room reference in the direction indicated will _________. SE-0002 A. cause a positive signal to be sent to the ahead function generator creating a more ... the ahead valve to open until the negative signal exceeds the low lube oil pressure override signal
Description : When 2 or more bits in a data unit has been changed during the transmission, the error is called ____________ A. random error B. burst error C. inverted error D. double error
Last Answer : B. burst error
Description : In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be (a) high, of the order of 25° (b) as low as possible (3 to 11°C) (c) zero (d) any value
Last Answer : Ans: b
Description : Which of the following statements is correct for any closed loop system ? (a) All the co-efficients can have zero value (6) All the co-efficients are always non-zero (c) Only one of the static error co-efficients has a finite non-zero value (d) None of the above
Last Answer : Ans: C
Description : The decomposition of A into B is represented by the exothermic reaction, A ⇌ 2B. To achieve maximum decomposition, it is desirable to carry out the reaction. (A) At high P and high T (B) At low P and high T (C) At low P and low T (D) At high P and low T
Last Answer : (C) At low P and low T
Description : According to Coast Guard Regulations (46 CFR), a battery installation must be in a room that is only for batteries or a box on deck. This would be termed a ____________. A. small installation B. moderate installation C. large installation D. high amp/hour capacity installation
Description : When using a megohmmeter to determine which shunt field coil is grounded in a DC machine, you must ____________. A. insulate the field frame from the ship's hull B. disconnect each shunt ... C. use a motor driven high capacity megohmmeter D. remove all main line lead connections before testing
Description : Etched or burned bands on the contact faces of the brushes in a direct current generator can be caused by ____________. A. high mica segments B. copper drag on the commutator C. brushes improperly positioned D. copper embedded in the brushes