QUESTIONAIRE FOR INSTRUMENT MECHANICS

OBJECTIVE QUESTIONS

1.      The two metal alloy elements in "K" type thermocouple is    (B)

(a)  Copper            -           Constantan

(b)  Chromel           -           Alumel

(c)  Platinum           -           Rhodium

(d) Chromel            -           Constantan

       2.      The resistance of PT-100 RTD is     (C)

      (a)    100 ohms at ambient temp.

      (b)   0 ohms at 100 ^c

      (c)    100 ohms at 0 ^c

      (d)   None of the above

3.      The gain of a PID controller is "1", Then proportional band is    (B)

(a)    0%

(b)   100%

(c)    50%

(d)   1%

4.      The square root output of a flow transmitter when the input is 25% of the calibrated range is    (D)

(a)    5%

(b)   25%

(c)    62.5%

(d)   50%

5.      In Honeywell  TDC - 3000 DCS, the controller should be put in  ----------mode while configuration a data point.     (B)

(a)    Auto mode

(b)   Manual mode

(c)    Cascade mode

(d)   Auto -cascade mode

6.      If Pressure Transmitter is calibrated in the range 0-60 kg/cm², what is the output (in terms of 4-20 mA) when the input is 22.5 kg/cm²       (A)                      

(a)    10        mA              

(b)   12        mA

(c)    8          mA

(d)   16        mA

7.      The type of Thermocouple for "Iron-Constantan" element is   (D)

(a)    T          Type

(b)   K         Type

(c)    R          Type

(d)   J           Type   

8.      What is the unit of CV in control valves    (D)

(a)    Liters / Minute

(b)   M3 / Hour

(c)    Gallons / Hour

(d)   None of the above

9.      What is Beta Ratio on orifice flow calculation   (A)

(a)    Orifice dia / Pipe ID

(b)   Pipe ID / Pipe OD

(c)    Orifice dia / Pipe Od

(d)   Orifice dia / 2

10.  The output of a Turbine flow meter is in  (B)

(a)    Milliamperes

(b)   Pulses

(c)    Ohms

(d)   Millivolts

11.  The drawback in Proportional only controller is    (B)

(a)    Dead band

(b)   Offset

(c)    Oscillatory response

(d)   All of the above

12.  The output of a two input AND gate when both of the inputs are 1 is     (B)

(a)    0

(b)   1

(c)    10

(d)   None of the above

13.  The flow and the Differential Pressure across an Orifice Plate are   (B)

(a)    Inversely Proportional

(b)   Directly Proportional

(c)    Not related with each other

(d)   Insufficient data

14.  In a Reverse Action Controller, the controller output increases when process value is ---------- set point   (B)

(a)    More than

(b)   Less than

(c)    Equal to

(d)   None of the above

15.  Zener Barrier is used for (A)

(a)    To make the instruments intrinsically safe

(b)   To make the instruments explosion proof

(c)    To save energy

(d)   To make the instrument respond fast