Тест по Engine Department about Electrical Electronic & Control (CES v6.0)

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Правильные ответы:
1

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?

Ваш ответ правильный:

4,6 V.
2

A triac is used to provide temperature control of an oven. The galley complain that the oven only reaches approximately 50 % of demanded temperature. Which of the following is a likely cause?

Ваш ответ правильный:

One of the main switching elements in the triac has failed.
3

Which of the following measures is to be taken when working with batteries?

Ваш ответ правильный:

Recharge batteries immediately after discharge.
4

Which of the following is an application of a piezoelectric sensor?

Ваш ответ правильный:

Accelerometer.
5

What is the minimum starting requirement of an emergency generator?

Ваш ответ правильный:

2 separate starting devices each with stored energy capable for at least 3 consecutive starts.
6

When considering instrumentation systems, what is the meaning of the expression “dead-band”?

Ваш ответ правильный:

The controller will not react to a process change in this range.
7

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

Ваш ответ правильный:

1 M Ohms.
8

In tanker operations, there will be some areas and zones where flammable or explosive vapour, gas or dust may be expected. Such areas are classified as hazardous. What is meant by hazardous area Zone 1?

Правильный ответ:

Flammable mixture is not continuously present, but will be present during normal operations.

Ваш ответ:

Flammable mixture would not normally be present or it would be present for a short period only.
9

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

Ваш ответ правильный:

Use a Digital Multi-Meter set to measure ohms in forward and reverse directions.
10

When performing electrical testing of a three phase motor, insulation resistance measurements may be influenced by which of the following?

Ваш ответ правильный:

Temperature, humidity and surface contamination.
11

Flow irregularities in pipes are not caused by:

Ваш ответ правильный:

Straight pipe.
12

Which of the following is not a mode of a closed loop control?

Ваш ответ правильный:

Manual.
13

A Multimeter is not suitable to measure:

Ваш ответ правильный:

Power.
14

Continuity testing of a delta connected three phase induction motor yields the following results; U1-V1 = 4 ohms, V1-W1 = 4 ohms, W1-U1 = 4 ohms. What is the value of continuity resistance for each winding ie. U1-U2?

Ваш ответ правильный:

6 ohms.
15

Which of the following functions does the diode shown here perform?

Ваш ответ правильный:

Return inductive current to supply at switch off.
16

Which of the following is an application of an capacitive sensor?

Правильный ответ:

Barometer.

Ваш ответ:

Tachometer.
17

Some ships generate electrical power at 440 Volts, 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?

Ваш ответ правильный:

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.
18

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

Ваш ответ правильный:

Gain too high.
19

What are the main elements for Process Control?

Ваш ответ правильный:

Process, Sensor, Final control element and Controller.
20

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

Ваш ответ правильный:

Vo will be the same sinusoidal curve but at a lesser amplitude.
21

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?

Ваш ответ правильный:

The gas, liquid or vapour which will minimise creation of an electric arc as contacts open.
22

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

Ваш ответ правильный:

Contactor chattering (vibrating).
23

The 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.

Ваш ответ правильный:

V (2) = 50 V.
24

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?

Ваш ответ правильный:

Figure A.
25

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

Ваш ответ правильный:

2,15 V.
26

When the cable length exceeds approx. 10 meters we normally have to in case of a Pt 100, in some way compensate for the cable resistance. Do we also have to do this if we choose to use a T802 temperature sensor?

Ваш ответ правильный:

No.
27

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?

Ваш ответ правильный:

The amount of apparent power, that would be drawn from the generating plant, when a short circuit occurs at the bus bars.
28

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?

Правильный ответ:

Between 0,1 and 1,0 Ohm.

Ваш ответ:

Between 0,1 and 1,0 M Ohm.
29

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

Ваш ответ правильный:

Direct on Line.
30

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?

Ваш ответ правильный:

Short circuit winding between W and U.
31

What is the advantage of a transmitter with a narrow measurement range?

Ваш ответ правильный:

Better linearity and increased accuracy.
32

How can a lead-acid type battery be checked to confirm if it is fully charged or not?

Ваш ответ правильный:

Measure the relative density (specific gravity) of the electrolyte.
33

When polarity of the incoming power line is reversed, what happens to the DC motor?

Ваш ответ правильный:

Motor rotates in the reverse direction.
34

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?

Ваш ответ правильный:

Figure 1.
35

This figure shows a transformer, with two windings, N(1) = 2 000 and N(2) = 1 000 turns, on a common magnetic circuit. Assume that there is no energy loss in the transformer itself. Calculate the current l(2) when the current l(1) = 2 A.

Ваш ответ правильный:

l(2) = 2 A.
36

What should be the healthy continuity resistance of a 220 V, 2,2 kW, 10 A heating element, when checked near to it’s rated operating temperature?

Ваш ответ правильный:

22 Ohms.
37

Which electronic component or system is this graphical symbol illustrating?

Ваш ответ правильный:

Bandpass filter.
38

Can a ZENER BARRIER be installed in a hazardous area?

Ваш ответ правильный:

No, as only the output from the barrier is intrinsically safe this is not allowed.
39

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?

Ваш ответ правильный:

Vacuum.
40

The circuit shows a full-wave bridge rectifier. Which electronic component should be connected between “a” and “b” in order to obtain reduced ripple voltage to the load RL.

Ваш ответ правильный:

Capacitor.
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