WorksheetsP90 Equivalency Exam — Worksheet Questions
Total questions: 25
Worksheet time: 13mins
What effect does adding resistance have on a series circuit?
It increases current flow
Its effects can't be measured.
It decreases current flow
It has no effect on a circuit
Technician A says that when jump starting a vehicle at the battery, make the positive (red) connections last and disconnect them first. Technician B says that measuring no-load battery voltage can give a general indication of battery state-of-charge.
Both A and B are correct
Neither A nor B are correct
B is correct
A is correct
Voltage is measured:
in series with the power ON
none of the above
with the voltmeter in series with the circuit
with the voltmeter in parallel with the circuit
Technician A says that a Hall-effect sensor provides a reliable signal even at very low rotational speeds. Technician B says that active wheel speed sensors can sense direction of rotation.
Neither A nor B are correct
Both A and B are correct
B is correct
A is correct
To measure the current draw when a car is at rest, connect a(n) ______ in ______ with the battery
wattmeter, series
voltmeter, parallel
ammeter, series
ohmmeter, series
Which of the following statements is true of an NTC sensor?
as temperature decreases, sensor resistance decreases
as temperature rises, sensor resistance increases
none of the above
as temperature rises, sensor resistance decreases
Technician A says that CAN Bus wires are twisted together for easy identification. Technician B says that CAN Bus wires are twisted together to eliminate the effects electromagnetic interference.
A is correct
B is correct
Neither A nor B are correct
Both A and B are correct
The resistance of a conductor changes by changing its length, material makeup, diameter and ________________?
size of electrons
none of the above
battery
temperature
Series circuits can be characterized as a circuit where:
all of the above
current is the same throughout the circuit
Adding loads increases total circuit resistance and lowers current flow
each load will drop part of the supply voltage
Termination resistors are used in CAN systems for diagnostic reasons.
False
True
Parallel circuits can be characterized as a circuit where:
all of the above
current can be different in each branch of the circuit
Adding loads to this circuit decreases total circuit resistance and increases current flow
all loads have the same voltage available
Which kind of circuit has more than one path for current to flow?
ground
series
parallel
digital
Pins 85 and 86 on a 4-pin relay are:
the control (magnet) circuit
draw a small amount of current
all of the above
should show a resistance
With a voltmeter connected in parallel to the negative starter circuit (from the battery negative post to the engine) the reading changes polarity when the engine starts this would indicate:
That the battery is connected in reverse
That there is an open between the alternator and the battery
That the ground cable has excessive resistance
That the alternator has begun to charge
NTC temperature sensors are semiconductors, what has a PTC temperature behavior?
Zirconium Dioxide
Silica doped with iridium
All metallic conductors
None of the above
What would the resistance of a 280 Ohm and a 75 Ohm resistor connected in parallel be?
62 Ohms
215 Ohms
59.2 Ohms
355 Ohms
Where are the termination resistors of the drive CAN located in a 2012 Panamera?
The DME control unit and the POSIP control unit
The DME control unit and the PSM control unit
None of the above
The PSM control unit and the Gateway
How is the alternator of a 2013 911 Carrera controlled?
By the DME over a LIN buss
By the DME via a BSS buss
By the integrated circuit in the alternator regulator
By the Gateway over a LIN buss
The function of a relay is to:
Isolate components from their power supply
Control a large voltage with a small voltage
Control a large current with a small current
Switch a small current with a large voltage
How is the transport mode for the 991 different from the transport mode of the Cayenne and Panamera?
It shuts off the TP circuits when activated
It turns the TP circuits into 30F circuits when activated
None of the above
It turns the TP circuits into 30SD circuits when activated
Which of the following is not required when performing an open circuit voltage test?
Checking the electrolyte level
Not turning the key on after fully charging the battery
Waiting for 2 hours
Disconnecting the battery
Why do we need to use a special charger that has a charging setting for VRLA (AGM) batteries?
In order to keep the pressure inside the battery below the pressure relief valve opening pressure
None of the above
Due to the fact that they overheat unless the charger cycles
Because they have a high internal resistance
Working on a 2011 Cayenne S, a technician measures 2.7 millivolts across a 10 amp fuse with the key out and all circuits switched off. This would indicate:
None of the above
There is a shorted diode in a relay
No problem this is normal voltage drop
There is approximately 361 m Amps of current flow in that circuit
You are testing the starting system of a 2010 997. The battery tests OK, engine cranks slower than normal and the amp draw is low. What test is indicated?
Voltage drop test for the starter cables
Battery open circuit voltage
Alternator output test
Current draw test
The DIN pin designations for a normally open relay’s switched circuit are:
a) 30 and 87a
b) 30 and 87
c) 85 and 86
d) 30 and 85
