問題一覧
1
Moisture accumulating in electric motors and generators windings having a cold insulation resistance greater than 50,000 ohms may be baked out with internal heat. This heat can be developed by
feeding current into the windings at low voltage
2
What is the degree of exactness of measurement when compared to the expected value of the variable being measured?
Precision
3
What is the word used in measurement where the degree of exactness compared to the expected value of the variable is being measured?
Accuracy
4
When reading electrical motor controller diagrams, it helps to know that
current paths in the power circuit are drawn as heavy lines and in control circuit as lighter lines
5
Electrical analogous quantity for dash-pot in force-current analogy is
Conductance
6
A temperature instrumentation system to an engine room console consists of a resistance temperature detector (RTD), a measuring bridge circuit, and a meter (or alarm circuit). Which of the following statements is true concerning the measuring bridge circuit?
The resistance bridge is said to be balanced when its output voltage is zero
7
A semiconductor that decreases in resistance with an increase in temperature is known as?
thermistor
8
An instrument used to detect and measure the presence of electrical current is generally called
galvanometer
9
Which of the following id the electrical analogous element for displacement in force-voltage analogy?
Charge
10
How are precision and reproducibility related?
they are the same
11
Transient state analysis deals with
Nature of Response
12
In order to check the performance of a transistor removed from its circuit, the instrument to be used should be a/an
ohmmeter or transistor tester
13
While trouble shooting a circuit in an engine room central control console, a resistor is suspected of being faulty. Which of the following precautions must be observed if an ohm meter is to be use to check its value?
Resistor circuit must be de-energized and at least one end of the component isolated
14
When shipboard electrical distribution circuits are connected in parallel, additional parallel circuits will cause the total circuit resistance to
increase, causing a decrease in the line voltage
15
What is being measured when the middle area of an ohmmeter scale is used?
in measuring circuits
16
Which type of meter requires its own power source?
ohmmeter
17
What does the variable resistance placed in the rotor circuit of a wound-rotor induction motor provide?
speed control
18
Weighting function is in terms of
Laplace transforms of impulse response
19
What is used to allow an ammeter to measure different ranges?
Series Resistors
20
Adding a pole to a system transfer function in terms of compensator represents a compensator
Lag