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Instrumentation Engg  papers 03 Questions And Answers No. Question
1  A surface height profile is given by, y = a + b sin  2 p  x
l
(0 x  l) where a, b, l are constants and x is the horizontal coordinate. The roughness of the surface, based on absolute deviation, is
Options  A) 2b
p
B) 4b
p

C) 6b
p
D) 8b
p

2  For N-bit Successive Approximation ADCs, other parameters such as clock frequency remaining constant, the conversion time is proportional to

Options  A) N 2  B) Ö  N

C) log N  D) N

3  The radius of a sphere is given as (40.0 ± 0.5)mm.  The estimated error in its mass is:
Options  A) ± 3.75%  B) ± 1.25%
C) ± 12.5%  D) ± 0/125%

4  A zero error in a vernier caliper is termed as
Options  A) accidental error   B) interference error
C) systematic error
D) random error

5  Given the discrete-time sequence x[n] = [2, 0, -1,-3, 4, 1, -l, X(e j p ) is
Options  A) 8  B) 6 p
C) 8 p  D) 6

6  Linear variable differential transformer has
Options  A) two primary coils connected in phase and a secondary coil  B) two primary coils connected in opposition and a secondary coil
C) one primary coil and two secondary coils connected in phase  D) one primary coil and two secondary coils connected in opposition

7  Position sensor units having a constant sensitivity of lV/mm are used for feedback in number of position controlled system units, each having an overall forward path dc gain of 50. If the random dc bias errors in the outputs of various sensor units are characterized as normal with mean 0 and standard deviation ( s ) 0.01V, for a constant set point of 5V, the true position outputs of the various controlled system units can be characterized as normal with

Options  A) mean of 5.0,  s of 0.01
B) mean of 0.0,  s of 0.01

C) mean of 5.0,  s of 0.0098
D) mean of 4.902,  s of 0.0098

8  The refractive index of the core of an optical fiber is n 1 and that of the cladding is nf If (n 1 – n 2 ) = D n, then the fiber can be made single mode with numerical aperture unchanged by
Options  A) reducing core diameter and increasing D n  B) reducing both core diameter and D n

C) reducing core diameter alone
D) reducing D n alone

9  For a suppressed carrier amplitude modulator (AM-SC) system, the carrier and the modulating inputs are x c (t) = cos w c t and x m (t) = 0.5 sin w m t, respectively. The output of the system is proportional to

Options  A) sin ( w c  + w m ) t – sin ( w c - w m ) t  B) sin ( w c   + w m ) t  +  cos ( w c   - w m ) t
C) (1 + 0.5 sin w m   t) cos w c t  D) (1- 0.5 sin w m t) cos w c t

10  The 3-dB cut-off frequency of a first analog high pas filter is w c  the output will have a phase shift of

Options  A) - p
2
B)
- p
4

C) p
2
D) p
2

11  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

12  A 3 ½ digit nultimeter has an accuracy specification of (± 0.5% of reading ± 5 counts). If the meter reads 2.00 mA on a full scale of 20mA, the worst-case error in the reading is

Options  A) 0.5%  B) 2.5%

C) 3.0%    D) 5.5%

13  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

14  Consider the  following systems:
System 2: G(s) = 1
2(2s+1)

System 1: G(s) = 1
2(5s+1)

The true statement regarding the system is

Options  A) Bandwidth of system 1 is greater than the bandwidth of system 2
B) Bandwidth of system 1 is lower than the bandwidth of system 2

C) Bandwidth of both the systems are the same
D) Bandwidth of both the systems are infinite

15  The transfer function of  a system is  A
s 2  + w 2
The steady-state gain of the system to a unit-step input is
Options  A) A
w 2
B) 0
C) ¥  D) not possible to be determined

16  In 8085 microprocessor, CY flag may be set by the instruction
Options  A) SUB  B) INX
C) CMA  D) ANA

17  V 1 and V 2 are the input voltages of an instrumentation amplifier. The output of the instrumentation amplifier is found to be 100(V 1 – V 2 ) + 10 -4 (V 1 + V 2 ). The gain and the common mode rejection ratio (CMRR) of the instrumentation amplifier respectively are
Options  A) (50, 60 dB)
B) (50, 120 dB)

C) (100, 60dB)
D) (100, 120 dB)

18  The sequence x[n] whose z-transform is X[z] = e (1/Z)  is

Options  A) 1
n!
u[n]  B) 1
-n!
u[-n]
C) (-1) n 1
n!
u[n]  D) 1
-(n+1)!
u[-n-1]

19  The time taken by an ionized atom, of mass m kg and charge e Coulombs, pulsed into a field-free region with V volts, to reach a detector L meters away is
Options  A) 1
L
Ö  m
2eV

B)
L Ö  m
2eV

C) m Ö  L
2eV

D) 2
L
Ö  m
2eV