What happens when a sine wave signal is input to a non-inverting op-amp circuit if the feedback resistor is open?

output at only positive and negative saturation

If a diode in a bridge rectifier opens, the observable symptom is:

increased ripple and decreased dc output under load

the opposite diode in the bridge will fail

What indication is observed when ohmmeter testing a good fuse?

low resistance in one direction and high resistance in the other direction

approximately 1K ohms in both directions

If a transistor in Class A amplifier is replaced and the emitter and collector leads of the replacement are accidentally reversed, the most likely consequence would be:

a gain that is less than normal

What resistance indications should be obtained when testing a functional diode with an analog meter having sufficient voltage at its terminals?

high resistance in one direction and low resistance in the other

low resistance in both directions

high resistance in both directions

no indication since an analog meter generally will not turn on a diode junction.

The indications shown on Figure 4 were obtained using a logic probe. What conclusion can be drawn from these indications?

the circuit is not functioning properly

the circuit is functioning properly

the circuit is probably functioning properly but, an oscilloscope test is necessary to confirm this

the circuit is probably not functioning properly, but an oscilloscope test is necessary to confirm this

A 60 Hz signal found everywhere in a circuit when using an oscilloscope usually means:

there is a bad scope lead ground

there is a shorted diode in the power supply

the scope should be switched to dc coupling

the outlet the unit is plugged into is wired incorrectly

If the circuit of Figure 5 is functioning correctly and a 10 mVpp sine wave is connected to C1 the waveform at the emitter should be:

about the same amplitude as the signal on the collector

approximately β times the base signal

In Figure 5, about how much emitter current would be expected?

there is not enough information given to calculate

How is the voltmeter connected to measure the voltage developed by the current through a component?

by removing the component and replacing it with the voltmeter

by momentarily opening the component and measuring its voltage

An ohmmeter test across the anode-cathode (positive lead to anode and negative lead to cathode and with the gate unconnected) of an out of circuit SCR shows low resistance. What would you conclude?

it is defective, probably shorted

cannot make final conclusion until a power test is performed

What precautions should be taken when using an oscilloscope to make hot chassis measurements?

the unit under test should be powered through an isolation transformer

the technician should wear a ground strap

hot components should be removed with grounded soldering tools

A switching power supply should initially be tested:

by reducing the main power frequency

The input impedance of an oscilloscope is generally:

adjustable with the triggering source control

adjustable with the triggering level control

When using the X10 on the sweep speed control (sec/div) the technician must:

multiply the sec/div reading by 10

multiply the volts/div reading by 10

divide the volts/div reading by 10

divide the sec/div reading by 10

Which of the following is not indicated by a logic probe?

the magnitude of a voltage in the indeterminate region

a voltage in the logic high region

a voltage in the logic low region

a voltage in the indeterminate region

When used for making voltage measurements, which of the following voltmeter input impedances provides for the least amount of circuit loading?

the impedance of the meter does not determine loading

When a number of signals are connected to a common bus, a tristate buffer might be used to:

interface different types of IC

condition slow signal transition time

What function does the optocoupler serve in a solid state relay (SSR)?

optocouplers are not found in SSRs

With an asserted level on clear and an unasserted level on set, if the J input of a JK flip flop is high and the K input is high, what is the Q output after the next clock pulse?

the opposite of its pre-clock state

In Figure 9, if C3 opens:

the gain of the amplifier will decrease

the transistor will be subjected to high current

the gain of the amplifier will increase

the transistor will go into cutoff

CET Section III

Authored by Andrew Waller

Other

University

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MULTIPLE CHOICE QUESTION

30 sec • 20 pts

When looking at waveforms in a switching power supply which of the following should not be done?

look at waveforms in the primary circuit and the secondary circuit with one probe and with its ground lead connected to the respective ground

look at the control signal of the switching device

connect one probe ground lead to hot ground and the other to cold ground

vary the input AC voltage

MULTIPLE CHOICE QUESTION

30 sec • 20 pts

What Vcc should be observed in TTL circuits?

3 V to 15 V

5 V

12 V

+/- 15 V

MULTIPLE CHOICE QUESTION

30 sec • 20 pts

If a unit under test is dead what is the most logical area to check first?

the power supply

the output device

divide the unit in half and begin in the middle

begin at the input and trace to the output

MULTIPLE CHOICE QUESTION

30 sec • 20 pts

To look at a high frequency, high magnitude waveform across a component(s), neither side of which is at chassis common, the oscilloscope would be used:

in the AC coupling mode

in the DC coupling mode

in the invert/add mode

by plugging the oscilloscope into an isolation transformer

MULTIPLE CHOICE QUESTION

30 sec • 20 pts

If a defective Hall-effect sensor is suspected check:

the continuity of the coil in the device

that current is being supplied to the device

that the window in the device is not dirty and light is being blocked

that the internal magnetic bias in the sensor is strong enough

MULTIPLE CHOICE QUESTION

30 sec • 20 pts

Refer to Figure 1. The output of this circuit will be:

nearly the same pp signal as the input with the opposite phase

nearly the same pp signal as the input with the same phase

a larger pp signal than the input with the opposite phase

a larger pp signal than the input with the same phase

MULTIPLE CHOICE QUESTION

30 sec • 20 pts

On the schematic of the unit you are testing you note that the word reset on the microprocessor has an overbar. The condition on that pin, at power up would be expected to be:

low and stay low

high and stay high

low and then go high

high and then go low

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CET Section III

When looking at waveforms in a switching power supply which of the following should not be done?

What Vcc should be observed in TTL circuits?

If a unit under test is dead what is the most logical area to check first?

To look at a high frequency, high magnitude waveform across a component(s), neither side of which is at chassis common, the oscilloscope would be used:

If a defective Hall-effect sensor is suspected check:

Refer to Figure 1. The output of this circuit will be:

On the schematic of the unit you are testing you note that the word reset on the microprocessor has an overbar. The condition on that pin, at power up would be expected to be:

What happens when a sine wave signal is input to a non-inverting op-amp circuit if the feedback resistor is open?

If a diode in a bridge rectifier opens, the observable symptom is:

What might be used in a triac circuit to lessen the chance of turn on by a sharp increase in the off-state voltage.

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