| 1 |
A surface height profile is given by, y = a + b
sin
(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 |
|
|
|
| Correct Answer |
A |
|
| 2 |
For N-bit Successive Approximation ADCs, other
parameters such as clock frequency remaining constant, the
conversion time is proportional to
|
| Options |
|
|
|
| Correct Answer |
B |
|
| 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% |
|
|
|
| Correct Answer |
B |
|
| 4 |
A zero error in a vernier caliper is termed as |
| Options |
| A) accidental error |
B) interference error |
C) systematic error
|
D) random error |
|
|
|
| Correct Answer |
B |
|
| 5 |
Given the discrete-time sequence x[n] = [2, 0,
-1,-3, 4, 1, -l, X(ejp) is |
| Options |
|
|
|
| Correct Answer |
C |
|
| 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 |
|
|
|
| Correct Answer |
D |
|
| 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
|
|
|
|
| Correct Answer |
C |
|
| 8 |
The refractive index of the core of an optical
fiber is n1and that of the cladding is nf If (n1
– n2) = Dn, then the fiber
can be made single mode with numerical aperture unchanged by |
| Options |
| A) reducing core diameter and increasing Dn |
B) reducing both core diameter and Dn
|
C) reducing core diameter alone
|
D) reducing Dn alone |
|
|
|
| Correct Answer |
D |
|
| 9 |
For a suppressed carrier amplitude modulator (AM-SC) system, the
carrier and the modulating inputs are xc (t) = cos wc
t and xm (t) = 0.5 sin wm
t, respectively. The output of the system is proportional to
|
| Options |
| A) sin (wc +
wm) t – sin (wc
- wm) t |
B) sin (wc
+ wm) t +
cos (wc -wm)
t |
| C) (1 + 0.5 sin wm
t) cos wc t |
D) (1- 0.5 sin wm
t) cos wc t |
|
|
|
| Correct Answer |
B |
|
| 10 |
The 3-dB cut-off frequency of a first analog high pas filter is wc the
output will have a phase shift of
|
| Options |
|
|
|
| Correct Answer |
B |