問題一覧
1
Which of the following statements is false? When two metal electrodes are
used in a simple cell, the one that is higher in the electrochemical series:
Acts as an anode
2
In normal operation an n-p-n transistor connected in common-base
configuration has:
Select one:
The emitter at a lower potential than the base
3
In the figure below, a voltmeter connected across R_L reads zero. Most
probably:
the base collector junction of the transistor has gone open circuit
4
In the crankshaft position sensor in the figure below, the induced voltage
across the coils is caused by
a tab passing through the magnetic field
5
A logic probe is placed on the output of a gate and the display indicator is
dim. A pulser is used on each of the input terminals, but the output
indication does not change. What is wrong?
Select one:
The output of the gate appears to be open.
6
Which of the following statements is false?
Select one:
The Q-factor at resonance in a parallel circuit is the voltage magnification
7
If you have an RC and an RL differentiator with equal time constants sitting
side-by-side and you apply the same input pulse to both;
Select one:
you cant tell the difference by observing the output waveforms
8
A sudden decrease in a total current into a parallel circuit may indicate:
Select one:
Either an open resistor or a drop in source voltage
9
When an IC has two rows of parallel connecting pins, the device is referred
to as a:
Select one:
DIP
10
A network designed to pass signals with frequencies between two specified
cut-off frequencies is called a ____ filter.
Select one:
a. low-pass
b. high-pass
c. band-stop
d. band-pass
c
11
Which of the following choices meets the minimum requirement needed to
create specialized waveforms that are used in digital control and
sequencing circuits?
Select one:
a. Basic gates, a clock oscillator, a repetitive waveform generator, and
a Johnson shift counter
b. Basic gates, a clock oscillator, and a De Morgan pulse generator
c. Basic gates, a clock oscillator, and a Johnson shift counter
d. Basic gates, a clock oscillator, and a repetitive waveform generator
d
12
An advantage of an auto-transformer is that:
Select one:
a. It reduces capacitance between turns
b. Iron losses are reduced
c. Copper loss is reduced
d. It gives a high step-up ratio
c
13
When checking out a series resistive circuit, you find that the current is
higher that it should be. You should look for:
Select one:
a. A short
b. Both a short and a low resistive value
c. An open circuit
d. A low resistive value
b
14
When the frequency of the source voltage is increased, the impedance of a
parallel RC circuit ____.
Select one:
a. increases
b. cannot be determined
c. does not change
d. decreases
d
15
Pentavalent impurities:
Select one:
a. introduce holes when added to a semiconductor material
b. are introduced by adding aluminum atoms to a semiconductor
material
c. have three valency electrons
d. increase a condition of a semiconductor material
d
16
Which of the following statements relating to operational amplifiers is true?
Select one:
a. It has a low open-loop voltage gain at low frequency, a high input
impedance and low output impedance
b. It has a high open-loop voltage gain at low frequency, a high input
impedance and low output impedance
c. It has a high open-loop voltage gain at low frequency, a low input
impedance and high output impedance
d. It has a high open-loop voltage gain at low frequency, a low input
impedance and low output impedance
b
17
In a series RC circuit, 10 V rms is measured across the resistor and 10 V rms
is also measured across the capacitor. The voltages are measured at a
certain frequency. To make the resistor voltage greater than the capacitor
voltage, the frequency
Select one:
a. is held constant
b. must be decreased
c. must be increased
d. has no effect
b
18
The speed of a d.c. motor may be increased by:
Select one:
a. Increasing the armature current
b. Decreasing the applied voltage
c. Decreasing the field current
d. Increasing the field current
d
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100問 • 1年前問題一覧
1
Which of the following statements is false? When two metal electrodes are
used in a simple cell, the one that is higher in the electrochemical series:
Acts as an anode
2
In normal operation an n-p-n transistor connected in common-base
configuration has:
Select one:
The emitter at a lower potential than the base
3
In the figure below, a voltmeter connected across R_L reads zero. Most
probably:
the base collector junction of the transistor has gone open circuit
4
In the crankshaft position sensor in the figure below, the induced voltage
across the coils is caused by
a tab passing through the magnetic field
5
A logic probe is placed on the output of a gate and the display indicator is
dim. A pulser is used on each of the input terminals, but the output
indication does not change. What is wrong?
Select one:
The output of the gate appears to be open.
6
Which of the following statements is false?
Select one:
The Q-factor at resonance in a parallel circuit is the voltage magnification
7
If you have an RC and an RL differentiator with equal time constants sitting
side-by-side and you apply the same input pulse to both;
Select one:
you cant tell the difference by observing the output waveforms
8
A sudden decrease in a total current into a parallel circuit may indicate:
Select one:
Either an open resistor or a drop in source voltage
9
When an IC has two rows of parallel connecting pins, the device is referred
to as a:
Select one:
DIP
10
A network designed to pass signals with frequencies between two specified
cut-off frequencies is called a ____ filter.
Select one:
a. low-pass
b. high-pass
c. band-stop
d. band-pass
c
11
Which of the following choices meets the minimum requirement needed to
create specialized waveforms that are used in digital control and
sequencing circuits?
Select one:
a. Basic gates, a clock oscillator, a repetitive waveform generator, and
a Johnson shift counter
b. Basic gates, a clock oscillator, and a De Morgan pulse generator
c. Basic gates, a clock oscillator, and a Johnson shift counter
d. Basic gates, a clock oscillator, and a repetitive waveform generator
d
12
An advantage of an auto-transformer is that:
Select one:
a. It reduces capacitance between turns
b. Iron losses are reduced
c. Copper loss is reduced
d. It gives a high step-up ratio
c
13
When checking out a series resistive circuit, you find that the current is
higher that it should be. You should look for:
Select one:
a. A short
b. Both a short and a low resistive value
c. An open circuit
d. A low resistive value
b
14
When the frequency of the source voltage is increased, the impedance of a
parallel RC circuit ____.
Select one:
a. increases
b. cannot be determined
c. does not change
d. decreases
d
15
Pentavalent impurities:
Select one:
a. introduce holes when added to a semiconductor material
b. are introduced by adding aluminum atoms to a semiconductor
material
c. have three valency electrons
d. increase a condition of a semiconductor material
d
16
Which of the following statements relating to operational amplifiers is true?
Select one:
a. It has a low open-loop voltage gain at low frequency, a high input
impedance and low output impedance
b. It has a high open-loop voltage gain at low frequency, a high input
impedance and low output impedance
c. It has a high open-loop voltage gain at low frequency, a low input
impedance and high output impedance
d. It has a high open-loop voltage gain at low frequency, a low input
impedance and low output impedance
b
17
In a series RC circuit, 10 V rms is measured across the resistor and 10 V rms
is also measured across the capacitor. The voltages are measured at a
certain frequency. To make the resistor voltage greater than the capacitor
voltage, the frequency
Select one:
a. is held constant
b. must be decreased
c. must be increased
d. has no effect
b
18
The speed of a d.c. motor may be increased by:
Select one:
a. Increasing the armature current
b. Decreasing the applied voltage
c. Decreasing the field current
d. Increasing the field current
d