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Instrumentation Engg  papers 02

Questions And Answers No. Question
1  In an 8085 microprocessor, which one of the following is the correct sequence of the machine cycles for the execution of the DCR M instruction?
Options  A) op-code fetch
B) op-code fetch, memory read, memory write
C) op-code fetch memory read
D) op-code fetch memory write, memory write

2  lim x ®  p /4
sin 2 [ x -  p
4
]
x - p
4

equals

Options  A) 0  B)
1
2

C) 1  D) 2

3  Three DC currents I 1 , I 2 and I 3 meet at a node with I 1 entering and I 2 and I 3 leaving the node.  I 1 and I 2 are measured as 100mA and 99 mA with a ± 1% accuracy. Then the value of I 3 and the accuracy of I 3 are
Options  A) 1 mA ± 2%  B) 199 mA ± 2%
C) 1 mA ± 2%  D) 1 mA ± 199%

4  The input-output characteristic of a Schmidt trigger has a hysteresis band of ± 0.1 V. If the input voltage is 5 sin (1000 p t), the delay between the corresponding zero cross-over points of the output and input signals is
Options  A) 6.37 m s   B) 0.02 m s

C) 63.7 m s   D) 2.0 m s

5  In a spirit level, 2.5mm of movement of the bubble corresponds to a tilt angle of 25 seconds. The radius of curvature of the tube of the spirit level is
Options  A) 52.1 m  B) 34.4 m
C) 26.3 m  D) 15.6 m

6  The loop transfer function of a system is given by G(S)h(s) =  10 e -Ls
s
.    The phase cross-over frequency is 5 rad/s.  The value of the dead time L is
Options  A) p /20  B) p /10
C) - p /20  D) zero

7  An 8-bit microcontroller has an external RAM is the memory map from 8000H to 9FFFH. The number of bytes this RAM can store is
Options  A) 8193   B) 8191

C) 8192   D) 8000

8  Two copper-constantan thermocouples are connected such that the two constantan wires are joined together.  The two copper wires are connected to the input of a low noise chopper stabilized differential amplifier having a gain of 1000.  One of the thermocouple junctions is immersed in a flask containing ice and water in equal proportion.  The other thermocouple is at a temperature T.  If the output of the amplifier is 2.050V, the temperature T is
Options  A) 205°C  B) 102.5°C
C) 51.25°C  D) 50°C

9  The vectored address corresponding to the software interrupt command RST7 in 8085 microprocessor is
Options  A) 0017H  B) 0027H

C) 0038H  D) 0700H

10  For a first order instrument a 5% settling time is equal to
Options  A) three times the time constant  B) two times the time constant

C) the time constant
D) time required for the output signal to reaches 5% of the final value

11  The measurements of a source voltage are 5.9V, 5.7V and 6.1V. The sample standard deviation of the readings is
Options  A) 0.013  B) 0.04
C) 0.115  D) 0.2

12  In an INTEL 8085 microprocessor the ADDRESS-DATA bus and the DATA bus are
Options  A) Non multiplexed  B) Multiplexed
C) Duplicated  D) Same as CONTROL bus

13  The number of comparators required in an 8-bit flash-type AID converter is
Options  A) 256   B) 255

C) (8 + 2)   D) 8

14  An ultrasonic beam of frequency 1 MHz and intensity 0.5 W/cm 2   passes through a layer of soft tissue of thickness t with an attenuation coefficient of 1.18cm -1 .  The ratio of output to input power is 1/e 2 .  The thickness of the tissue is
Options  A) 1 cm  B) 1.695 cm
C) 2.408 cm  D) 3.712 cm

15  A twisted pair of wires is used for connecting the signal source with the instrumentation amplifier, as it helps reducing
Options  A) the effect of external interference  B) the error due to bias currents in the amplifier
C) the loading of the source by the amplifier  D) the common mode voltage

16  The output from a 633 nm He-Ne laser comes out from the mirror with a beam diameter of lmm and diverges to the far field. It is brought to a focus by a convex lens of focal length of 17 mm. The spot size diameter of the beam at the focal point is
Options  A) 20  m m  B) 26  m m

C) 52  m m  D) 13  m m

17  International temperature scale in the range 0-630oC is defined by means of a
Options  A) mercury pressure spring thermometer  B) platinum-platinum.  10% rhodium thermocouple
C) platinum resistance thermometer  D) total radiation pyrometer.

18  A microprocessor has an instruction XOR (r 1  , r 2 ) which performs an Exclusive OR operation of registers r 1 ,r 2 and stores the result in r 1 . After the following instructions are executed
XOR (r 2 , r 1 )

XOR (r 1 ,r 2 )

XOR (r 2 ,r 1 )
Which one of the following is true?

Options  A) Content of register r 1 is half sum of r 1 and r 2
B) Content of register r 2 is half sum of r 1 and r 2

C) Contents of registers r 1 and r 2 remain unaltered  D) Contents of registers r 1 and r 2 are swapped

19  A second order feedback system is found to be oscillating with a high frequency.  The oscillations
Options  A) can be reduced by increasing the proportional action  B) can be reduced by increasing the integral action
C) can be reduced by increasing the derivative action  D) cannot be reduced