Test online for seamans about EE, Management Level (CES v6.0)

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Правильні відповіді:
1

“Protective discrimination” means the progressive grading of sizes or tripping times of:

Ваша відповідь правильна:

Line fuses and overcurrent relays.
2

The figures show a graphical symbol for a particular electronic component and a typical working characteristic for the same component. Which component?

Правильну відповідь:

Silicon controlled rectifier (SCR).

Ваша відповідь:

Tunnel diode.
3

Ordinary thyristors (SCR) must often be protected against reverse overvoltage transients. This is because they can be damaged by over-voltage, even if it is of extremely short duration. These SCRs have been given such over-voltage protection, but only one of them is correct. Which one is it?

Ваша відповідь правильна:

Figure 1.
4

Diodes are widely used in rectification, or the conversion of alternating current to direct current. The sinusoidal input voltage V(in) is applied to the circuit shown. Which of the output voltages is correct?

Ваша відповідь правильна:

Figure 1.
5

What could the wheelman be asked to do, to help in the preparations to leave the berth and go to sea?

Ваша відповідь правильна:

Test the steering by putting the wheel hard over both ways.
6

This circuit consists of a voltage source V, a change-over switch S, a resistor R and a capacitor C. The voltage/time figures 1 to 4 show changes in the voltage V(C) when the switch S is suddenly shifted from position 1 to 2 at time t = 0. Only one of the diagrams is correct. Which?

Ваша відповідь правильна:

Figure 1.
7

This circuit consists of a current source I, a change-over switch S, a resistor R and a capacitor C. The current/time figures 1 to 4 show possible changes in the current I when the switch S is suddenly shifted from position 1 to 2 at time t = 0. Which diagram is correct?

Правильну відповідь:

Figure C.

Ваша відповідь:

Figure A.
8

Where is the “FORECASTLE” in the figure?

Ваша відповідь правильна:

The Forecastle is indicated by B.
9

This circuit shows a transformer with two windings, N (1) = 2 000 and N (2) = 1 000 turns, on a common magnetic circuit. Assume that there are no energy losses in the transformer itself. Calculate the output voltage V (2) when the input voltage is V (1) = 100 Volt.

Ваша відповідь правильна:

V (2) = 50 V.
10

Which cell voltage is required to trickle charge a lead acid battery?

Ваша відповідь правильна:

2,15 V.
11

During an anchoring operation, what does the bridge team mean when they ask “How is the chain leading”?

Ваша відповідь правильна:

The bridge would like to know the direction of the anchor cable from the hawse pipe.
12

What do you call the wide rung on a pilot ladder that prevents the ladder from twisting?

Правильну відповідь:

The wide rung on a pilot ladder that prevents it from twisting is called a “Spreader”.

Ваша відповідь:

The wide rung on a pilot ladder that prevents it from twisting is called a “Wide step”
13

On the diagram, what is the area at the forward end of the vessel shown by the letter “A”? It is normally raised by one deck above the main deck.

Ваша відповідь правильна:

Fo’csle or Forecastle.
14

Where is the “PORT QUARTER”, in the figure?

Ваша відповідь правильна:

The Port quarter is D in the figure.
15

Which is the “CAPSTAN” in the figure?

Ваша відповідь правильна:

The Capstan is indicated by A in the figure.
16

The pressure inlet to a pressure gauge is varied from zero to full scale and back to zero again. The output (indicating pressure) versus true pressure is shown in the diagram.The non-coincidence (mismatch) of loading and unloading curve is due to internal friction in the instrument. What do we call this phenomenon?

Правильну відповідь:

Hysteresis.

Ваша відповідь:

Threshold.
17

In a PID controller it is possible to change the setting of the Proportional band (P), the Reset time (I) and the Rate time (D). Please indicate which curve shows the typical response to a step change in input, if the setting of the reset time is too small.

Ваша відповідь правильна:

Figure 3.
18

What is name of the machine shown, used to heave on the ropes during mooring and unmooring?

Ваша відповідь правильна:

Winch.
19

In fresh water tank we are using a pressure transmitter with a range of 0-0,5 bar/4-20 mA for level measurement. The transmitter is installed 30 centimetres from the bottom of the tank, and the tank is 5 meters high. What will the output from the transmitter be when the tank is empty?

Правильну відповідь:

4 mA.

Ваша відповідь:

2,8 mA.
20

Can a ZENER BARRIER be installed in a hazardous area?

Правильну відповідь:

No, as only the output from the barrier is intrinsically safe this is not allowed.

Ваша відповідь:

Yes, that’s what the zener barrier is made for.
21

The inductance which will induce an EMF of 1 Volt in a conductor when the current is changing at a rate of 1 Amp per second, is defined as:

Ваша відповідь правильна:

One Henry.
22

Which of the following methods may a diode may be tested by?

Правильну відповідь:

Use a Digital Multi-Meter set to check forward voltage and reverse current blocking.

Ваша відповідь:

Use a Digital Multi-Meter set to measure ohms in forward and reverse directions.
23

When starting three phase induction motors which of the following starting methods will immediately apply rated voltage to the machine?

Ваша відповідь правильна:

Direct on Line.
24

The picture shows the component parts of a fluorescent light (items 10 to 14) above a circuit diagram (items 1 to 9). Between which terminals of the circuit should the ballast (or choke) be connected?

Ваша відповідь правильна:

1 and 9.
25

A cable has a resistance of 100 milli-ohms. It supplies a 300 A load over a distance of 100 metres. What is the voltage drop along it’s length?

Ваша відповідь правильна:

30 Volts.
26

In a closed loop control system the error signal is derived from which of the following?

Ваша відповідь правильна:

The demand and the feedback signal.
27

A thermistor which provides feedback for a thermal control system is suspected to have failed. Assuming there is no available direct/identical replacement for thermistor, which of the following methods may be used to prove it has failed?

Правильну відповідь:

Disconnect the thermistor lead from the controller and replace with a mV source.

Ваша відповідь:

Disconnect the thermocouple lead from the controller and replace with a mA source.
28

A galley hot plate uses a Nichrome / Magnesium Oxide heating element and is to be tested before being put into service for the first time. An insulation resistance test yields a reading of 0,3 M Ohm. Which action should be taken?

Ваша відповідь правильна:

Apply reduced voltage to the element for a few minutes. Then retest and if ok put into service.
29

A High Breaking Capacity fuse found in a Main High Voltage Switchboard will typically have fault level rating of?

Ваша відповідь правильна:

40 kA.
30

When there is a need to interrupt current flow in a high voltage system it may be very difficult to quench the electrical arc which is generated at the circuit breaker contacts. Which of the following arcing media is commonly found in high voltage marine switchgear?

Ваша відповідь правильна:

Vacuum.
31

Three earth lamps indicate (under no test mode) – bright – bright – dark. Which of the following is indicated by this condition?

Ваша відповідь правильна:

No faults on the system but a failed lamp.
32

Continuity testing of a delta connected three phase induction motor yields the following results; U – V = 3 ohms, V – W = 3 ohms, W – U = 6 ohms. Which of the following is the likely condition?

Ваша відповідь правильна:

Open circuit winding between W and U.
33

The continuity resistance of a 100 m long × 25 sq. mm cable (rated at 100 A) is to be checked. Which of the following results would you anticipate?

Ваша відповідь правильна:

Between 0,1 and 1,0 Ohm.
34

A 250 V contactor has been fitted to a 220 V supply. Which of the following symptoms might be observed?

Ваша відповідь правильна:

Contactor chattering (vibrating).
35

Which of the following is the minimum acceptable value of insulation resistance for High Voltage equipment?

Ваша відповідь правильна:

100 M Ohms.
36

When selecting switchgear to work with High Voltage it is important to use an appropriate arc quenching medium. What is meant by arc quenching medium?

Ваша відповідь правильна:

The gas, liquid or vapour which will minimise creation of an electric arc as contacts open.
37

High Voltage systems rely on the installed protective equipment being able to interrupt any fault in the system. Throughout the system, the fault level has been calculated, and under no circumstances must the system be modified to exceed this fault level. What is meant by fault level?

Правильну відповідь:

The amount of apparent power that could flow into any fault at any point in the electrical network.

Ваша відповідь:

The current level flowing into a symmetrical short circuit fault between all three phases.
38

What type of Ex equipment is suitable for installation in Zone 0 hazardous area?

Правильну відповідь:

Ex i.

Ваша відповідь:

Ex a.
39

When we are measuring salinity with a salinometer, the type of sensing device is:

Ваша відповідь правильна:

Electrodes.
40

In an automatic temperature control system, operating with a PID controller which of the following settings or parameter adjustments may result in system oscillation?

Правильну відповідь:

Gain too high.

Ваша відповідь:

Gain too low.
41

What are the main elements for Process Control?

Ваша відповідь правильна:

Process, Sensor, Final control element and Controller.
42

Following shows circuitry of a peak detector. What is the output voltage curve, Vo if Vi is a sinusoidal input curve?

Ваша відповідь правильна:

Vo will be the same sinusoidal curve but at a lesser amplitude.
43

When selecting switchgear to work with High Voltage it is important to use an appropriate arc quenching medium. What is meant by arc quenching medium?

Ваша відповідь правильна:

The gas, liquid or vapour which will minimise creation of an electric arc as contacts open.
44

A 250 V contactor has been fitted to a 220 V supply. Which of the following symptoms might be observed?

Ваша відповідь правильна:

Contactor chattering (vibrating).
45

This circuit consists of a current source I, a change-over switch S, a resistor R and a capacitor C. The current/time figures 1 to 4 show possible changes in the current I when the switch S is suddenly shifted from position 1 to 2 at time t = 0. Which diagram is correct?

Правильну відповідь:

Figure A.

Ваша відповідь:

Figure D.
46

Which cell voltage is required to trickle charge a lead acid battery?

Ваша відповідь правильна:

2,15 V.
47

An important quantity which is useful in circuit analysis is known as conductance G (Siemens). Which of the formulas express the conductance for this circuit?

Ваша відповідь правильна:

G = 1/R.
48

A 5 V DC source has an internal impedance of 0,2 ohms. When a load of 2,3 ohms is applied what voltage will be measured at the source terminals?

Ваша відповідь правильна:

4,6 V.
49

What principle of measurement are viscosity controllers usually based upon?

Правильну відповідь:

Measurement of differential pressure.

Ваша відповідь:

I don’t know.
50

What is the maximum current that a 15 V, 3 Watt Zener diode can handle without damage?

Ваша відповідь правильна:

0,2 A.
51

The inductance, which will induce an EMF of 1 Volt in a conductor, when the current is changing at a rate of 1 Amp per second, is defined as:

Ваша відповідь правильна:

One Henry.
52

The typical current gain for a common emitter transistor is:

Ваша відповідь правильна:

10-200.
53

The instrument most widely used for testing of semiconductor diodes is:

Ваша відповідь правильна:

Multi-meter.
54

A 6-Volt DC relay is to be used with a 12-Volt power supply. The relay requires a current of 0,1 Amp. What is the series resistance required?

Ваша відповідь правильна:

60 Ohm.
55

In the diagram, which letter is pointing to the area of the ship known as the “STERN”?

Ваша відповідь правильна:

The Stern area is indicated by C.
56

Some ships generate electrical power at 440 V, but then step up this voltage to supply specific electrical equipment. One common example, may be to feed a large bow thruster. Why is this done?

Правильну відповідь:

A large bow thruster will draw very large currents at low voltage. Being typically remote from the generator, significant voltage drops would occur at low voltage.

Ваша відповідь:

The shipyard could not purchase a High Voltage generating plant at the time of manufacture, so they used what was available at the time.
57

When work must be done on High Voltage equipment, it is vital that the equipment is earthed (grounded) after isolation procedures have been carried out. Why is this?

Правильну відповідь:

To ensure that no energy remains in the system, and that it cannot be recharged by external influences.

Ваша відповідь:

To ensure that it is dead, even if there was a flaw in the isolation procedure.
58

When selecting switchgear to work with High Voltage it is important to use an appropriate arcing medium. What is meant by arcing medium?

Ваша відповідь правильна:

The gas, liquid or vapor, which will minimize creation of an electric arc as contacts open.
59

Sometimes an early warning of failure in High Voltage switchboards may be an unpleasant smell. If the switchboard uses gas circuit breakers, which of the following may indicate a potential problem?

Ваша відповідь правильна:

Rotten eggs.
60

Why could dirty and oily areas of the deck be dangerous?

Ваша відповідь правильна:

They may cause people to slip over and hurt themselves.
61

What do you understand by “Bitter end”?

Ваша відповідь правильна:

Bitter end means: the end link of an anchor cable that is secured within the chain locker.
62

In the diagram, which letter is indicating the position “MIDSHIPS”?

Ваша відповідь правильна:

Midships is indicated by B in the figure.
63

When keeping a lookout, what would be the correct understanding of the question “What is the aspect of the other ship”?

Правильну відповідь:

The question is requesting some indication of what lights or part of the vessel is seen.

Ваша відповідь:

The question is requesting some idea of how far away the other ship is from your own ship.
64

What is understood by the term “take the helm”?

Ваша відповідь правильна:

Take over the steering of the ship.
65

Would there ever be the need for two lookouts on the Bridge watch?

Правильну відповідь:

Yes, possibly whne there is dense fog and heavy traffic.

Ваша відповідь:

Every night there should be two lookouts, one on each bridge wing.
66

If the order is given to a mooring deck to “make fast”, what would happen?

Правильну відповідь:

Make fast means to apply a lashing to a coiled mooring rope.

Ваша відповідь:

Make fast means to set very quickly.
67

What is a ship’s “Gangway”?

Ваша відповідь правильна:

A Gangway is a portable means of access between the ship and the shore.
68

What is meant by the term “bunkers”?

Ваша відповідь правильна:

It means the number of available bunk spaces available on the vessel.
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