Deck 4: Oscilloscopes and Dsos

Question 1

A signal showing the voltage of a battery displayed on an analog oscilloscope is being discussed. Technician A says that the display will show one horizontal line above the zero line. Technician B says that the display will show a line sloping upward from zero to the battery voltage level. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Answer 1

A

Question 2

A TP sensor signal voltage is being observed using a digital storage oscilloscope. The pattern on the scope occasionally rises to the source voltage level. What does this indicate?

A) Normal operation
B) A momentary short in the TP sensor
C) A momentary open circuit
D) A fault with the scope leads

Answer 2

B

Question 3

Two technicians are discussing pulse train signals. Technician A says that a pulse train is a DC signal waveform that goes above and below zero volts. Technician B says that a pulse train is a DC voltage that turns on and off in a series of pulses and they do not go below zero. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Answer 3

B

Question 4

Which type of oscilloscope displays all voltages without taking samples?

A) Complex
B) Analog
C) Digital
D) None of these

Question 5

Technician A says that analog scopes use an LCD display. Technician B says that digital scopes may use a CRT display. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question 6

A digital storage oscilloscope is set to begin displaying a waveform when a certain voltage is detected. This minimum voltage is called ________.

A) threshold
B) trigger
C) trip
D) None of these

Question 7

A typical DSO display screen is arranged in an ________ grid.

A) 6 × 8
B) 8 × 10
C) 8 × 8
D) None of these

Question 8

Technician A says that voltage is usually indicated on the horizontal display axis. Technician B says that time is usually indicated on the horizontal display axis. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question 9

________ the time base setting reduces the number of samples per second.

A) Increasing
B) Dividing
C) Decreasing
D) None of these

Question 10

A time base setting of 1ms/div will show a total time of ________ on the scope display

A) 100 ms
B) 1 ms
C) 10 ms
D) None of these

Question 11

Which is the correct voltage division setting for testing a throttle position sensor?

A) 1V
B) 3V
C) 5V
D) 10V

Question 12

Which of these is measured as a percentage?

A) Pulse width
B) Duty cycle
C) Dwell
D) None of these

Question 13

Which of these terms is a measure of the actual on-time measured in milliseconds?

A) Period
B) Pulse width
C) Frequency
D) Amplitude

Question 14

A DSO and a ________ are useful tools when diagnosing a fuel pump circuit.

A) hose clamp
B) current clamp
C) vacuum transducer
D) test light

Question 15

With the scope set as shown, the maximum voltage to be measured is ________ and the time displayed will be ________.

A) 8 volts; 500mS
B) 1 volt; 1 second
C) 1 volt; 500 mS
D) None of these