CHECK YOUR PROGRESS ANSWERS

ENGINEERING 3

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		b. Allows current to move through it
2. Insulator		c. Will not allow current flow
3. Fuse		d. Will melt with current overload
4. Resistance		a. The opposition to current flow

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

Name the components of the simple circuit labelled below:

A= battery B= fuse

C= switch D= light globe

E= resistor

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

Match the term with the description:

1. Volt		b. A unit of electrical potential difference
2. Amp		c. A unit of electrical current flow
3. Watt		d. A unit of electrical power
4. Ohm		a. A unit of electrical resistance

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 is12 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 vessel’s 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 won’t

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 hydrometer.

It is used for testing the specific gravity of battery acid.

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 vessel’s generator set:

STEP 1 Start up the gen set

STEP 2 Check the gen set indicator shows its line is active

STEP 3 Switch over to the gen set

STEP 4 Disconnect the shore power

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 guards.

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		c. Removal of all services into a space
2. Lockout		a. Physical barriers erected to prevent entry
3. Gas free certificate		b. Issued only by a competent person
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 circuit breakers.

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

Faulty electrical equipment must be isolated and tagged:

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 link both battery banks when one bank has gone flat.

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 it 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	___________________________________________________________ ___________________________________________________________