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ENGINEERING 3†† †††††††††††††††††††††††††††††††(printable pdf) †††††††††††††(answers)

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TDMMR3007B††††††††† 1 Operate and carry out basic service checks on small vessel marine propulsion systems

TDMMR3107B††††††††† 2 Operate and carry out basic servicing on auxiliary systems

TDMMR3207B††††††††† 3 Operate and carry out basic routine servicing of marine extra low/low voltage electrical systems

 

ELECTRICAL SYSTEMS

Question 1 (1 Mark) Validates to TDMMR3207B element 1a

Electricity can be generated electro-chemically and electro-magnetically.

TRUE

FALSE

 

 

Question 2 (1 Mark) Validates to TDMMR3207B element 1a

The electrolyte in a lead-acid battery is?

a.             hydrochloric acid

b.             sulphuric acid

c.             diluted nitric acid

d.             diluted sulphuric acid

 

Question 3 (1 Mark) Validates to TDMMR3207B element 1a

Match the term with the description:

1. Conductor

 

a. The opposition to current flow

2. Insulator

 

b. Allows current to move through it

3. Fuse

 

c. Will not allow current flow

4. Resistance

 

d. Will melt with current overload


Question 4 (1 Mark) Validates to TDMMR3207B element 1a

Name the components of the simple circuit labelled below:

A=_______________________††††††††††††††† B=_______________________

C=_______________________††††††††††††††† D=_______________________

†††††††††††††††††† ††††††††††††††††E=_______________________

Question 5 (1 Mark) Validates to TDMMR3207B element 1a

Match the term with the description:

1. Volt

 

a. A unit of electrical resistance

2. Amp

 

b. A unit of electrical potential difference

3. Watt

 

c. A unit of electrical current flow

4. Ohm

 

d. A unit of electrical power


Question 6 (1 Mark) Validates to TDMMR3207B element 1a

The lead acid battery shown below has six two volt cells internally connected in

series. The voltage available from this charged battery is _____________ volts.

Question 7 (1 Mark) Validates to TDMMR3207B element 1a

Draw the electrical leads, correctly connected, that will be required to fully light the test 12 volt light globe from two 12 volt batteries shown below.

Question 8 (1 Mark) Validates to TDMMR3207B element 1a

This circuit in Question 7 is said to be a series circuit.

TRUE

FALSE


Question 9 (1 Mark) Validates to TDMMR3207B element 1a

Draw the electrical leads, correctly connected, that will be required to fully light the test 24 volt light globe from two 12 volt batteries shown below.

Question 10 (1 Mark) Validates to TDMMR3207B element 1a

These circuits are said to be a series/parallel circuits.

TRUE

FALSE

 

Question 11 (1 Mark) Validates to TDMMR3207B element 1b

Batteries should be installed in a vessel:

a.             high up above the water line in case of swamping

b.             low down to increase the stability of the vessel

c.             where they can be vented to the atmosphere

d.             at a height where they are easily checked avoiding back injuries

 

Question 12 (1 Mark) Validates to TDMMR3207B element 1b

When a fuse blows you should replace it with:

a.             a higher capacity fuse

b.             a lower capacity fuse

c.             the same capacity fuse

d.             a piece of rolled up silver foil


Question 13 (1 Mark) Validates to TDMMR3207B element 1b

If the battery leads of a small vesselís 12 volt electrical circuitry were reversed

a.             the fuses would blow

b.             it does not matter

c.             electrical motors will operate normally but the radio wonít

d.             electrical system damage and personal injury may result

 

Question 14 (1 Mark) Validates to TDMMR3207B element 1c

The instrument shown below is called a_______________________.

It is used for_____________________________________________.

 

Question 15 (1 Mark) Validates to TDMMR3207B element 1c

The specific gravity of a battery cell that is fully discharged is described as:

a.             1100

b.             1250

c.             1150

d.             1200


Question 16 (1 Mark) Validates to TDMMR3207B element 1d

The 240 volt switching unit shown below indicates that there is current in the shore power line. Describe the procedures to switch over to the vesselís generator set:

STEP 1____________________________________________________

STEP 2____________________________________________________

STEP 3____________________________________________________

STEP 4____________________________________________________

 

Question 17 (1 Mark) Validates to TDMMR3207B element 1d

When connecting shore power at a jetty in the rain, great care must be taken to fully insert the plug before switching on the electrical socket because:

a.             you could slip

b.             the plug may be swollen and not fit properly

c.             the damp may act as an insulator

d.             you could be electrocuted


Question 18 (1 Mark) Validates to TDMMR3207B element 2a

If the ammeter reads negative and the voltmeter is dropping a likely cause is a:

a.             slipping alternator drive belt

b.             over revving alternator

c.             open circuit

d.             flat battery

 

Question 19 (1 Mark) Validates to TDMMR3207B element 2a

Moving machinery pulleys and drives must be fitted with a ________________.

 

Question 20 (1 Mark) Validates to TDMMR3207B element 2b

If an alternator diode fails the voltage indicator will read zero.

TRUE

FALSE

 

 

Question 21 (1 Mark) Validates to TDMMR3207B element 3a

The gas given off by a battery when it is being charged is?†

a.             explosive

b.             ozone

c.             chlorine

d.             toxic

 

Question 22 (1 Mark) Validates to TDMMR3207B element 3b

Salt water used to top the battery electrolyte if nothing else is available.

TRUE

FALSE


Question 23 (4 Marks) Validates to TDMMR3207B element 3c

With reference to confined spaces, match the description on the right, with the correct item on the left:

1. Isolation

 

a. Physical barriers erected to prevent entry

2. Lockout

 

b. Issued only by a competent person

3. Gas free certificate

 

c. Removal of all services into a space

4. Permit to work

 

d. Required conditions of entry

 

Question 24 (1 Mark) Validates to TDMMR3207B element 3d

The switches on the 240 volt panel shown below are called_______________.

 

Question 25 (1 Mark) Validates to TDMMR3207B element 3d

Faulty electrical equipment must be_______________and________________:


Question 26 (1 Mark) Validates to TDMMR3207B element 3d

Of the three battery switches at the bottom of this 24 volt switch board the middle

one is only used to_____________________________________________.

 

Question 27 (4 Marks) Validates to TDMMR3207B element 3e

A fire control plan is summarised by the phrase to FIRE-

Find the problem, Inspect/isolate it, Report and the Extinguish.

Write a brief plan for the damage that I have found for you.

F

An electrical fire has broken out in the 240 volt switchboard.

I

___________________________________________________________

___________________________________________________________

R

___________________________________________________________

___________________________________________________________

E

___________________________________________________________

___________________________________________________________

†††††††††††††††††††††††††††††††††† Ranger Hope © 2008 (contains reworked material courtesy of ANTA)