Gasco Tes.pdf

WRITTEN TEST FOR INSTRUMENT TECHNICIAN

Ref.: TSTF/Inst. Technicians - Rev. 1 Date:

IDNo.:

Name: . C.^ ^PH^ . J^'^^^.^'^'^

Location:

Subject: Questionnaire for Instrument Technician

Time: 60 Minutes

1. HSE 2. ESD/PLC 3. FIELD 4. TURBINES/COMPRESSORS

Evaluation:

ITEM 1. HSE 2. ESD/PLC 3. FIELD 4. TURBINES/COM PRESSORS REMARKS

Assessment

Recommendations/Remarks:

Instrument Technician Questionnaire - TSTF Page 1 of 13

Win7

ZAMRONI

WRITTEN TEST FOR . INSTRUMENT TECHNICIAN


1. HSE:

H-1 Define and explain b r i e f l y the f o l l o w i n g methods of pr o t e c t i o n :

1- Ex d

2- Ex e .....\'^5.....^rp.^5^. P.

WRITTEN TEST FOR . i INSTRUMENT TECHNICIAN ^ ^ k - > \

Ref.: TSTF/Inst. Technicians - ifev. / Date:

H-3 What is area classification and what meant by zone 0, zone 1 and zone 2? . \ i \ \ \V, P

.'2;0M ...0

_ ion^__. y _5?.^?.c?.'^.^.. !\.^ 9^ 0... *...!..^?.^.. .V!f[. .cx.^ b^ ! .V.^.^.vi ... .?.(|.w':.f .'c^t

H-4 What i s the permit to work? Describe your r o l e and r e s p o n s i b i l i t y i n PTW system.

... V^... ..^H.\b.9 .Vi.V^^ :

Instrument Technician Questionnaire - TSTF

Page 3 of 13

WRITTEN TEST FOR , i INSTRUMENT TECHNICIAN > \

mm Ref.: TSTF/Inst. Technicians - Rev. 1

Date: 2. E S D / P L C : E-1 There i s a closed tank with 4 l e v e l switches: LSH, LSHH, LSL, and LSLL. The bottom i s connected to 2 pumps A & B. LSH s t a r t s A^' pump. LSHH annunciates alarm & also s t a r t s ^B' pump. LSL stops both pumps. Should they f a i l to stop & LSLL actuates, a l alarm annunciates locks of both pumps. The pumps w i l l only r e s t a r t a f t e r being reset. 1- Draw a two-line r e l a y c o n t r o l schematic. 2- Draw an equivalent l o g i c block schematic

(USE EXTERNAL PAPER TO ANSWER QUESTION E-1)

E-2 Assume that a c o n t r o l valve regulates steam flow to a process and that high temperature makes the rea c t i o n hazardous. The usual pneumatically operated c o n t r o l valve u t i l i s e s the f o l l o w i n g a c t i o n f o r f a i l - s a f e operation.

A i r to Open b. A i r to Close c. 3 PSI to f u l l y open d. 15 PSI to f u l l y c lose. e. None of the above

E-3: What are the main modules i n a PLC and t h e i r function u.. . .mam.. ...7... .s,sci\u%.... hh... .. )fJ^.\.

E - 4 . D e s c r i b e b r i e f l y the ^ f o l l o w i n g terms [I '-

a. RAM.

.. ^QD.ioh ....h CCi.^>... ^ ^r^^S

.. Wnirio.r^ ..... y j!^-.. .y.Wi... .. .s^ .^ iVr.h... .. .. .p.^t^ .^^ c.,. .so....

...l9L^9.f.>(...S^Cll...V\^ S b. ROM

..!kQ.d....0.o.Vj..b.'^ ins)r.'; neo?.Qrvc.... D^y.. .vf.Ql?. ... ^ .

1\

I t a l i a n r e s t a u r a n t

c N I G H T l l F l ST> LE

1 ^

1 4

r / f^r'ft 1

A I A '^N C G A

L O B B Y L O U N G E

JL. L INGKAR M E G A K U N I N G A N K A V . E I . l N O . l MEGA K U N I N G A N , J A K A R T A 12950. INDONESIA. Tel. 62 21 2551 8888 - Fax. 62 21 2551 8889

WRITTEN TEST FOR . i INSTRUMENT TECHNICIAN 4 ^ 1 ^ > \

mm Ref.: TSTF/Inst. Technicians - Rev. 1 Date:

0. EPROM.

..)^.i...Uf


mii(sf Ref.: TSTF/Inst. Technicians - Rev. 1 Date:

Scan time

E-5. Give the name, t r u t h table and output Boolean equation for each of the fo l l o w i n g l o g i c gates: ( A & B are the inputs, and Y i s the output)

M T D c 0 0 \ C \ P

1 ^ 1 ^ o 0

0 : \ 1 0 \ \ \

o \ 0


Page 6 of 13


Ref.: TSTF/Inst. Technicians - Rev. I Date:

mii(sf E-6. Which t r u t h table represents the OR elementary l o g i c function?

Inputs Output b. Inputs Output B A Y B A Y 0 0 1 0 0 0 0 1 1 0 1 1 1 0 1 1 0 1 1 1 0 1 1 0

Inputs Output d. Inputs Output A B Y B A Y 0 0 0 0 0 1 0 1 1 0 1 0 1 0 1 1 0 0 1 1 1 1 1 0

E-7

B

E-8 . a. 3 b. 12 (g)l9 d. 21

Write the truth table and the final Boolean equation:

\

4;^ 1. \ ^ The decimal equivalent of 10011 binary i s :

Instrument Technician Questionnaire - TSTF Page 7 of 13

WRITTEN TEST FOR INSTRUMENT TECHNICIAN mm


3. FIELD:

F - l I f a pr o p o r t i o n a l band i s set so that 50% of the input gives a f u l l range of output, the pr o p o r t i o n a l gain i s :

a. 0.5 b . 4 . 0 s)^. c. 1.0 ^ Q. 2.0 e. None of the above

F-2 104F i s equal t o : a. 25C

(b). 4 0C c . 50C d . 80C e. None of the above

F-3 In below diagram, which of the fo l l o w i n g heights i s equal to the pressure applied to the manometer well?

Pressure

Reference level

a . H (p. H-E c . H+E d . 1^ (H + E)

F-4 What i s the di f f e r e n c e between absolute pressure and gauge pressure?

.A^M^.. .^rf.m^^.... .r-... .^.Q^^.G... .^.''.^.5.^*:f.>;?. ... ..


makf Ref.: TSTF/Inst. Technicians - Rev. I Date:

F-5 The dead band of an instrument i s : a. The band or seal that prevents the instrument from _ being tampered with by unauthorised persons, (jz. The range of values f o r which the instrument gives

inaccurate readings. c. The s i z e of the increment i n d i c a t e d by the d i v i s i o n s

on the scale of the instrument. d. The range of values, which an input s i g n a l may be

changed with no observable change i n output. e. None of the above

F-6 This input-output graph represents which type of instrument error?

f i f ^ ^

iwvr

a. Span b . ZERO S h i f t

Non- l inea r d. d. L inear e. Non of the above

F-7 A 0-^ 0 PSIG pressure gauge i s being c a l i b r a t e d . S t a r t i n g at 0 PSI, the t e c h n i c i a n applies a pressure of 15 PSI. The gauge reads 1419-PSIG. Then the technician applies 30 PSI, when the supply pressure i s returned to 15 PSI, the reading i s 15.2 PSIG. What type of error might these readings i n d i c a t e ?

a. Hysterics error . Span error c. Zero s h i f t e r r o r d. L i n e a r i t y e r r o r e. None of the above

InstrLiment Technician Questionnaire - TSTF Page 9 of 13



F-8 The temperature range of a transmitter i s 0-200. output s i g n a l range i s 3-15 PSIG. What would be expected output s i g n a l f or an input temperature of 150?

a. 6 PSIG b. 9 PSIG c. 11.25 PSIG d. 12 PSIG ^ None of the above

A mm The the

F-9 Describe the function of each s i g n a l l i n e ?

^ ^ ^

FIO A pneumatic pressure tr a n s m i t t e r i s c a l i b r a t e d to a pressure range of ICQ to 500 PSI. The s i g n a l output i s 10.2 PSI. What i s the measured pressure i n PSI?

a. 272 PSI b. 340 PSI c. 267 PSI

333 PSI e. None of the above

F-11 A turbine flow meter produces an output i n the form of pulses. The t o t a l number of pulses i s : a. Inversely p r o p o r t i o n a l to flow ^ D i r e c t l y p r o p o r t i o n a l to t o t a l flow c. P r o p o r t i o n a l to the square root of flow d. Propo r t i o n a l to the square of flow e. None of the above


Page 10 of 13

WRITTEN TEST FOR , i INSTRUMENT TECHNICIAN 4^1^ > \

madf Ref.: TSTF/Inst. Technicians - Rev. 1 Date: F-12 Name f i v e d i f f e r e n t types of flow meters:

a. .to.d.. ',...C:T...V....W.en.\Hf.r(...4 ..IH.I?^ b. .r^ \?.r. c. ..y^ .^ V^?x.....t^ .Ver

d. .. .^ .V Vp.m .^ i). .V. 9..... ^ Ww. .v:f\.^ r 8. .. h'^.V."*. .'^ 'f'.'?f .I'^ lv^ . T.

F-13 A d i f f e r e n t i a l pressure t r a n s m i t t e r i s c a l i b r a t e d 0 to 80 inches of water and transmits a 4 to 20 mA DC s i g n a l . This t r a n s m i t t e r i s placed across an o r i f i c e p l a t e , which i s s i z e d to create 80 inches of water d i f f e r e n t i a l at 6 gallons per minute. What i s the flow rate when the s i g n a l i s 13 mA DC?

a . 4.5 gpm b. 3.9 gpm c. 3.4 gpm d. 4.9 gpml e. None of the above

F-14 What i s the d i f f e r e n c e between flow to open and f a i l to open c o n t r o l valve \ ^ , .... ^ VM ... ... .


mii(sf Ref.: TSTF/Inst. Technicians - Rev. 1 Date:

5. TURBINES/COMPRES SORS

T-1 What i s the function of the a x i a l displacement probe and where i t i s i n s t a l l e d ? , . ,i

....^'\...r.'^^^^^...[.'?\}^^

T-2 In a gas turbine, what ij-fe

T-3. What are the d i f f e r e n t parameters used to co n t r o l the gas turbine f u e l gas t h r o t t l e valve?

T-4. For variable-speed centrifugal compressor with characteristic curves shown bellow, is operating at point A on 100% speed.

Explain briefly the compressor behaviour when A approaches and reaches B.

ACTUAL INLET-VOLUME FLOW Q


Page 13 of 13

Gasco Tes.pdf

Documents

Transcript of Gasco Tes.pdf