HIGH VOLTAGE OPERATIONAL LEVEL EXIT EXAM QUESTIONS AND ANSWERS 1.0

  • Which among the following are the typical HV system voltage used in the marine field ?
  1. 2.6 KV
  2. 3.2 KV
  3. 6.4 KV
  4. 11 KV                      *
  • Brushless generators are designed to operate without the use of
  1. Brushes
  2. Slip rings
  3. Commutators
  4. All of the above                  *
  • The fault current is exceptionally low for __________
  1. HV supplies                   *
  2. LV supplies
  3. Both HV and LV
  4. None of these
  • The induced voltage across a stationary conductor in a steady magnetic field is zero
  1. True                         *
  2. False
  • The HV switches can be operated by _______
  1. Anyone
  2. Authorised person only                  *
  3. Chief engineer only
  4. None of these
  • High voltage switchboard can be earthed down using two methods circuit earthing and ______
  1. Resonant earthing
  2. Busbar earthing                  *
  3. Resistance earthing
  4. None of the above
  • 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                     *
  • How is COVID-19 passed on ?
  1. Through droplets that come your mouth and nose when you cough or breathe out               *
  2. In sexual fluids, including semen, vaginal fluids or anal mucous
  3. By drinking unclean water
  4. All of the above
  • The __________ are commonly used for measurements of peak values of high voltages
  1. Sphere gaps                *
  2. Voltage difference
  3. Current
  4. None
  • The physical separation of two parts of a device or equipment is called as ________
  1. Enclosure
  2. Isolation               *
  3. Insulation
  4. Segregation
  • Which allow to equalize power factor of two alternator ?
  1. Governor
  2. Automatic voltage regulator                   *
  3. Syncroscope
  4. None of these
  • Circuit breakers and disconnects are used to de energize a high voltage source
  1. True
  2. False                   *
  • Ground occur in the electrical machinery as a result of insulation failure
  1. Deteration through moisture
  2. Excessive heat
  3. External period of vibration
  4. All of the above             *
  • Arc interruption is done by __________
  1. High resistance interruption
  2. Low resistance interruption
  3. Both a and b                  *
  4. None of the above
  • If a cable becomes wet or it absorbs moisture, it will develop _______  resistance
  1. Low insulation resistance                        *
  2. High insulation resistance
  3. Same as before
  4. None of the above
  • Ionization in circuit breakers is facilitated by ________
  1. Increase of field strength
  2. Increase of men free path
  3. High temperature
  4. All of these                         *
  • ________– contains the shipyard’s description of operations regarding the vessels’s HV equipment
  1. Preliminary operation manual                *
  2. High voltage operation manual
  3. Performance manual
  4. Equipment manual
  • Regulation for design and installation of marine high voltage systems are governed by the _____________
  1. International association of classification societies                  *
  2. International maritime union
  3. United maritime association
  4. Marine electrical association
  • The vacuum circuit breaker is applicable only for­­­­­­___________ voltage systems
  1. Very low
  2. Low
  3. Medium                      *
  4. High
  • The proof test voltage of class 1 in selecting rubber gloves is _______
  1. 2500 AC / 10000 DC
  2. 10000 AC / 40000 DC                      *
  3. 5000 AC / 10000 DC
  4. 1000 AC / 20000 DC
  • Low voltage circuit breakers have rated voltage less than ______
  1. 220 V
  2. 440 V
  3. 1000 V             *
  4. 10000 V
  • Arcing does not occur in heavy current flow to earth during an earth fault or short circuit fault
  1. True
  2. False                     *
  • Air blast circuit breakers are preferred for ________
  1. Short duty
  2. Intermittent duty
  3. Repeated duty                           *
  4. All of these
  • Which of the following is false with regard to electric shock  ?
  1. When high voltage of about 50 volt is applied through the human body it results in heart fibrillation
  2. Electric shock occurs when a person touches an improperly insulated dead conductor                        *
  3. The human body has a resistance and impedance to the flow of electrical current
  4. The impedance of the body of a person depends on the voltage applied
  • A fuse that blows often should be replaced only with a fuse of
  1. The recommended current and voltage rating                               *
  2. Higher current and voltage rating
  3. Higher current and lower voltage rating
  4. Lower current and higher voltage rating
  • The extremely light and heat produced by the arc is known as ________
  1. Arc flash                  *
  2. Arc blast
  3. Arc quench
  4. Arc light
  • With regard to flow of current through the body 0.015 A is the ________ current
  1. Tickling
  2. Let go                      *
  3. Dangerous
  4. Lethal
  • PI test is conducted for low voltage generators
  1. True
  2. False                   *
  • What is polarisation index ?
  1. Ratio of 10 min resistance to 1 minute insulation resistance                             *
  2. Ratio of 1 min resistance to 10 minute insulation resistance
  3. Ratio of 5 min resistance to 25 minute insulation resistance
  4. None of these
  • Bathrooms should be adequately ventilated to avoid accumulation of explosive gases  Usually generated in the operation of batteries
  1. True              *
  2. False

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