| 1 |
An oscilloscope screen displays a line inclined
at 45°. Its Y-input is a sine wave of frequency f then the X-input
should be
|
| Options |
| A) sine wave of frequency f and 0° phase shift
with the Y-input |
B) sine wave of frequency f and 45° phase shift
with the Y-input
|
| C) sine wave of frequency f and 90° phase shift
with the Y-input |
D) saw-tooth wave of frequency f |
|
|
|
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| 2 |
If the Fourier transform of x[n] is X(ejw)
then the Fourier transform of (-l)n x[n] is |
| Options |
| A) (-j)w X(ejw) |
B) (-l)w X(ejw)
|
C) X(e(j(w -p))
|
D)
(X(ejw))
|
|
|
|
| Correct Answer |
C |
|
| 3 |
One method of measuring the radius of an arc
(r) is to allow a roller of radius (r) to oscillate to and fro on
the arc and measure the average time per oscillation, T seconds .
The roller will then have a linear acceleration of 2g/3 where g is
acceleration due to gravity in such an experiment, the value of
radius of arc can be found from the expression: |
| Options |
| A) (T2g/6p2)+r |
B) (T2g/6p2)-r |
| C) (T2g/6p2) |
D) (6r2/T2g) |
|
|
|
| Correct Answer |
A |
|
| 4 |
The following terms used in the context of an
instrument are numbered as shown :
(1) accuracy, (2) sensitivity, (3) precision and (4) resolution
Match these with their possible definitions listed below
P. Repeatability of readings on successive observations
Q. Smallest perceptible change in the output
R. Deviation of the output from the true value
S. Minimum value of the input from the true value
T. Ratio of the change in the instrument reading to the change in
the measured variable. |
| Options |
| A) 1-P, 2-Q, 3-R, 4-S |
B) 1-S, 2-Q, 3-P, 4-T |
| C) 1-R, 2-T, 3-P, 4-Q |
D) 1-T, 2-Q, 3-P, 4-R |
|
|
|
| Correct Answer |
C |
|
| 5 |
Which one of the following is derived unit (NOT
a basic unit) in SI system?
|
| Options |
| A)
Candela
|
B)
coulomb
|
| C) Kelvin |
D) mol.
|
|
|
|
| Correct Answer |
C |
|
| 6 |
An amplifier of gain 10, with a gain-bandwidth
product of 1 MHz and slew rate of 0.1 V/ms
is fed with a10 KHz symmetrical square wave of ± 1 V amplitude.
Its output will be |
| Options |
| A) ± 10 V amplitude square wave |
B) ± 2.5 V amplitude square wave |
| C) ± 10 Vamplitude triangular wave |
D) ± 2.5 V amlitude triangular wave |
|
|
|
| Correct Answer |
C |
|
| 7 |
V1 and V2 are the input
voltages of an instrumentation amplifier. The output of the
instrumentation amplifier is found to be 100(V1 – V2)
+ 10-4 (V1 + V2). 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)
|
|
|
|
| Correct Answer |
C |
|
| 8 |
The sequence x[n] whose z-transform is X[z] = e(1/Z) is
|
| Options |
| A)
u[n] |
B)
u[-n] |
| C) (-1)n
u[n] |
D)
u[-n-1] |
|
|
|
|
| 9 |
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 |
|
|
|
| Correct Answer |
B |
|
| 10 |
The clock frequency of a timer-counter is
10MHz. The timer-counter is used in the period mode and the
input to the timer-counter is a square wave of frequency 2 kHz. The
display of the timer-counter will show a value |
| Options |
| A) 200 |
B) 2000 |
| C) 5000 |
D) 50000 |
|
|
|
| Correct Answer |
C |