tuvquestions

TUV Questions
1.	What is true statement of the EU guidelines
a.	Should allow free movement in EU of goods
b.	Only sold/operated in EU
c.	Manufacturer must issue
d.	Declaration of conformity

2.	What the CE mark is
a.	Quality – no
b.	Declaration of conformity – yes
c.	Optional – no
d.	Sold in the EU – yes

3.	Name required measures when a machine is modified
a.	Always attached a new CE mark – no
b.	Prepare documentation – yes
c.	Evaluate performance level of safety fn – no
d.	Inform the operating staff – yes

4.	Which statement true according to EU guideline
a.	Each country creates its own guidelines – no
b.	EU guidelines should guarantee free travel – yes
c.	They are recommendations – no
d.	Guidelines always refer to the application of standards – no

5.	When can a standard presume to conform to European guidelines
a.	When it is listed in the official journal of EU

6.	Name Hierarchy of standards
a.	Consequences of standards C->B->A

7.	Which are true
a.	Standards describe the current technology – yes
b.	ISO must be applied for CE marking – no
c.	Safety related standards are always listed in official journals of EU – no
d.	Standards are technical regulations with recommendations – yes

8.	Name corrective measures for foreseeable misuse
a.	Reconsideration of operating and safety concept – yes
b.	Involvement of safety experts when purchasing – yes
c.	Replacement of staff – no
d.	Installation of e-stop – no

9.	Which is true about risk assessment
a.	An EU declaration of conformity may not be issues in principle without a risk assessment – yes
b.	EN ISO 12100 always describes the identification of hazardous locations as adequate measures – no
c.	Machine must be designed and built under consideration of risk assessment – yes
d.	The purchaser of the machine receives the risk assessment document – no

10.	What is the highest PL that can be achieved with a individual relay or contactor
a.	C

11.	Is Category 2 a single channel structure
a.	No

12.	What are 3 ways to calculate MTTFd
a.	Manufacturers datasheets
b.	Calculate an estimate from Annex C
c.	Annex D
d.	Set to 10 years

13.	Is common cause failure applicable to Category 2
a.	Yes

14.	When is it necessary to use guards (separating protective device) on a machine
a.	When part are ejected – yes
b.	Radiation – yes
c.	At all access points to the machine – no
d.	When using lifting/rotary devices – no

15.	A moveable isolating device (guard locking switch) is configured so hazardous location can be reached before other risk has been minimized. What measures are suitable to reduce the residual risk
a.	Lock – yes
b.	Sign – no
c.	Interlocking device with guard locking – yes
d.	Light curtain – no

16.	Which is true with respect to OSSD
a.	OSSD signals of ESPE are maintained by ESPE itself – yes
b.	OSSD signals connected to safety PLC need no further diagnostics by safety PLC -no
c.	OSSD signals connected to safety PLC need to be monitored by cross checking – yes
d.	Using type-2 ESPE (performance level C) is sufficient to process 1 of the OSSD signals to reach performance level C – no

17.	How many positions does an enabling switch have – 3

18.	Which is true with respect to e-stop
a.	Disconnection of power is also permitted with electronic devices – yes
b.	The power is always disconnected in the event of an e-stop – no
c.	An e-stop can be implement by safe operating stop – no
d.	It is allowed to perform an estop in category 1 stop – yes

19.	What is true with respect to Category 3
a.	Accumulation of faults may not lead to loss of safety function – no
b.	Each fault must be detected before or at the next request of the safety function – yes
c.	The diagnostics for channel 1 may be carried out be other units than the logic unit of channel 2 – yes
d.	All faults must  be detected – no

20.	Which is true
a.	If using module safety plc then it may be necessary to consider each modules individually in PL calc – yes
b.	Safety PLC need no consideration in PL calc – no
c.	It has to be ensured test function for sensors and actuators are activated in the logic – yes
d.	The deactivation of output test within safety PLC may have effects on test of other outputs – yes

21.	Which safety standard is responsible for drives
a.	EN 61800-5-2

22.	Which safety functions corresponds to stop categories EN 60204-1
a.	STO
b.	SS1
c.	SS2

23.	What are the appropriate measures to achieve the safety function STO
a.	Contactor between power supply and drive – yes
b.	Fuses in power supply phases of drive system – no
c.	Safe pulse inhibit – yes
d.	Setpoint selection via control PLC – no

24.	Which manufacturer data is required for safety function if you consider the drives as subsystem for determining the PL and there are no category requirements
a.	DC – no
b.	PFHd – yes
c.	CCF – no
d.	PL – yes

25.	Which standard defines the qualitative requirements for the complete lifecycle of safety related software
a.	IEC 1131 – no
b.	EN ISO 61800 – no
c.	EN ISO 13849-1 and 13849-2 - yes
d.	EN ISO 12100-1 – no

26.	What maximum performance level can be achieved using the safety related embedded software (SRESW) in accordance with EN ISO 13849-1
a.	PLb - no
b.	PLc - no
c.	PLd - yes
d.	PLe – no

27.	How can software faults be avoided
a.	Training – yes
b.	Redundant hardware – no
c.	Time management – yes
d.	Certified functional modules -yes

28.	The validation plan must contain the following
a.	Tools which are used for validation (test equipment) – yes
b.	All technical documents - no
c.	Operating conditions – yes
d.	List of safety functions – yes

29.	What forms part of the documentation of validation in accordance with 13849-2
a.	Manual of all components used in the machine – no
b.	Validation plan – yes
c.	Logs of the test records – yes
d.	Safety information for usage and possible limitations for the user – yes

30.	What must a validation show
a.	A validation must contain an analysis – yes
b.	A validation must show each SRP/CS subsystem meets the requirement of 13849-1 – yes
c.	The validation is limited to checking the safety function and the eschewed PL – no
d.	The validation must always be carried out through analysis and testing – no

31.	What must be noted about the response under fault conditions
a.	All the faults and failures are recorded in a list in EN ISO 13849-2 – no
b.	An FMEA (failure mode and effect analysis) must be carried out for faults and failures that are not listed in EN ISO 13849-2 – yes
c.	EN ISO 13849-1 defines common faults and failures – yes
d.	Further cases must be taken into account in addition to faults and failures according to 13849-2 – yes

32.	Which statements are correct
a.	The validation should be performed by the same person who is in charge of the design – no
b.	During the validation a check is made whether the system solution meets the user requirements – yes
c.	Using the IFA systema software covers all aspects of validation – no
d.	A component can be well tried for one application but unsuitable for another application – yes

33.	Give some examples of safety modules according to Annex V of the machinery directive MRL 2006/42/EC
a.	Pressure cut off valve against pressure intensification – no
b.	Logic unit to guarantee safety function -yes
c.	Ropes, chains, belts – no
d.	Pull-wire – yes

34.	Name the consequences of a thermal hazard (check the formulas)
a.	Frostbite – yes
b.	Bruising – no
c.	Dehydration – yes
d.	Mutation – no

35.	EN ISO 12100 describes the iterative process for risk reduction including risk assessment. Which measure must be carried out before the start of the process?
a.	Check: is there a C type standard for this machine? – yes
b.	No measure – no
c.	Check: is there a B type standard for this machine? – no
d.	Check: is there an A type standard for this machine – no

36.	Which of the name measures are proven safety principles
a.	Overdimensioning/safety factor – yes
b.	Positive mechanical action/operation – yes
c.	Use of de-energisation principle – no
d.	Protection against unexpected start-up – no

37.	Determination of the risk and the associated PLr. Which statements apply
a.	If in doubt, the higher value should be user for parameters S, F and P – yes
b.	The same PLr applies to all risks of a machine – no
c.	The risk graph of EN SIO 13849-1 only makes one possible option available for determining the PLr. Other options are also permitted. – yes
d.	The exact level of frequency of exposure to the hazard is required to determine the PLr. – no

38.	Which component can be used to implement a safety function
a.	Two-hand operator console - yes
b.	Contactor - yes
c.	Standard PLC – yes
d.	Laser scanner - yes