FUNCTION -5 (ELECTRICAL)

91. Local action in a nickel-cadmium battery is offset by _____________.
    1. separating the positive and negative plates with plastic spacers
    2. separating the positive and negative plates with resin impregnated spacers
    3. adding a small amount of lithium hydroxide to the electrolyte
    4. trickle charging

ANS.: D

92. The freezing point of the electrolyte in a fully charged lead-acid battery will be _____________.
    1. higher than in a discharged battery
    2. lower than in a discharged battery
    3. the same as in a discharged battery
    4. higher than in a discharged battery, but the specific gravity will be less

ANS.: B

93. Which of the following represents the accepted method of cleaning dust and foreign particles from electrical equipment while limiting damage to electric components?
    1. Carefully wiping off the components with a soft cotton rag.
    2. Blowing a high velocity stream of compressed air rapidly across the component
    3. Using a vacuum cleaner to remove debris from the components.
    4. Using carbon tetrachloride as a cleaning solvent to clean the components

ANS.: C

94. Regarding an AC generator connected to them am electrical bus; as the electric load and power factor vary, a corresponding change is reflected in the generator armature reaction. These changes in armature reaction are compensated for by the _____________.
    1. governor speed droop setting
    2. voltage regulator
    3. balance coil
    4. phase-balance relay

ANS.: B

95. In an induction motor, rotor currents are circulated in the rotor by _______
    1. slip rings and brushes
    2. an armature and brushes
    3. inductive reaction of the rotating stator field
    4. external variable resistors

ANS.: C

96. An electrical device which prevents an action from occurring until all other required conditions are met is called a /an ___________.
    1. limit
    2. monitor
    3. modulator
    4. interlock

ANS.: D

97. A circuit breaker and a fuse have a basic similarity in that they both _______
    1. can be reset to energize the circuit
    2. should open the circuit when overloaded
    3. will burn out when an over current flow develops
    4. all of the above

ANS.: B

98. The electrolyte in a lead-acid storage battery consists of distilled water and _____________.
    1. hydrogen chloride
    2. calcium chloride
    3. sulphuric acid
    4. muriatic acid

ANS.: C

99. The full torque electric brake on an electric cargo winch functions to _____________.
    1. act as a backup brake in the event the mechanical brake should fail
    2. automatically hold the load as soon as current to the machine is shut off
    3. automatically govern the lowering speed of the load
    4. automatically govern the hoisting speed of the load

ANS.: B

100. When troubleshooting most electronic circuits, “loading effect” can be minimized by using a voltmeter with a/an ____________.
     1. input impedance much greater than the impedance across which the voltage is being measured
     2. input impedance much less than the impedance across which the voltage is being measured
     3. sensitivity of less than 1000 ohms/volt
     4. sensitivity of more than 1000 volts/ohm

ANS.: A

101. An electric tachometer receives the engine speed signal from a _______________.
     1. small generator mounted on the engine
     2. bimetallic sensing device
     3. stroboscopic sensing device
     4. vibrating reed meter generating a voltage proportionate to engine speed

ANS.: A

102. A semiconductor that decreases in resistance with an increase in temperature is known as a ___________.
     1. resistor
     2. thermistor
     3. diode
     4. thermopile

ANS.: B

104. An operating characteristic appearing on the name plates of shipboard AC motors is _____________.
     1. the type of winding
     2. input kilowatts
     3. temperature rise
     4. locked rotor torque

ANS.: C

105. Low horsepower, polyphase, induction motors can be started with full voltage by means of ___________.
     1. compensator starters
     2. autotransformer starters
     3. across-the-line starters
     4. primary-resistor starters

ANS.: C

106. Moisture damage, as a result of condensation occurring inside of the cargo winch master switches, can be reduced by _______________.
     1. installing a light bulb in the pedestal stand
     2. coating the switch box internals with epoxy sealer
     3. venting the switch box regularly
     4. using strip heaters inside the switch box

ANS.: D

107. Where a thermal-acting breaker is required to be used in an area of unusually high, low, or constantly fluctuating temperatures, an ambient compensating element must be used. This element consists of a ______________.
     1. cylindrical spring on the contact arm
     2. conical spring on the contact arm
     3. second bimetal element
     4. second electromagnet

ANS.: C

109. The electrolyte used in a nickel-cadmium battery is distilled water and ______________.
     1. diluted sulfuric acid
     2. potassium hydroxide
     3. lead sulfate
     4. zinc oxide

ANS.: B

110. Which of the damages listed can occur to the components of a winch master control switch, if the cover gasket becomes deteriorated?
     1. Overheating of the winch motor.
     2. Contamination of lube oil.
     3. Sparking at the winch motor brushes.
     4. Rapid corrosion of switch components.

ANS.: D

111. An accidental path of low resistance, allowing passage of abnormal amount of current is known as a/an ____________.
     1. open circuit
     2. short circuit
     3. polarized ground
     4. ground reference point

ANS.: B

112. A resistance in a circuit of unknown value is to be tested using the voltmeter/ammeter method. Therefore, the meters should be connected with _____________.
     1. both meters in series with the resistance
     2. both meters in parallel with the resistance
     3. the ammeter in series and the voltmeter in parallel with the resistance
     4. the ammeter in parallel and the voltmeter in series with the resistance

ANS.:  C

113. SOLAS regulations state that a normal source for emergency loads and power on a cargo vessel must be supplied from ____________.
     1. emergency generator supply to the emergency switchboard
     2. emergency generator supply to the main switchboard
     3. battery supply to the main switchboard
     4. ship’s service generator via the emergency switchboard

ANS.: D

114. A storage battery for an emergency lighting and power system must have the capacity to _____________.
     1. close all watertight doors twice
     2. open all watertight doors four times
     3. open and close all watertight doors in six consecutive cycles within a 20 second period
     4. none of the above

ANS.: A

115. SOLAS regulations require emergency diesel engine starting systems to have sufficient capacity to provide power for at least ____________.
     1. three continuous starting sequences
     2. six consecutive cranking cycles
     3. nine repeated starts under load
     4. twelve cranking periods of 5 seconds

ANS.: B

116. Which of the following statements is a Safety regulation concerning emergency generator diesel engines? (SOLAS / Cargo Ship Safety Construction Rules)
     1. The fuel must have a flash point not less than 750F.
     2. Emergency diesel engines must be capable of operating under full load in not less than 30 seconds after cranking.
     3. The starting battery must produce 12 consecutive cranking cycles.
     4. Emergency diesel engines must operate satisfactorily up to a 22.50 list

ANS.:  D

117. While on watch in the engine room at sea with only one ship’s service shaft generator on line, the entire plant suddenly blacks out without warning. After restoring power, the cause for this casualty could be attributed to which of the following faults?
     1. The micro switch at the generator speed trip vibrated open, allowing the main breaker to open via the under voltage trip.
     2. Someone pushed the trip button to the “shore power” breaker.
     3. The main air compressor suddenly stopped.
     4. The standby generator started automatically and became motorized

ANS.:  A

118. The function of a rectifier is similar to that of a _______.
     1. trap
     2. regulating valve
     3. check valve
     4. Filter

ANS.: C

119. The basic control action of a magnetic amplifier depends upon _____________.
     1. variations in the load capacitance
     2. changes in inductance
     3. type of core material
     4. construction of the core

ANS.: B

120. The seven segment arrangement for numerical display on consoles, test meters and other applications can be either ________________.
     1. UJT or BJT
     2. BCD or OCD
     3. JFET or IGFET
     4. LED or LCD

ANS.: D