The candidate who are going to appear for the exam must know that the Railways Technicians Exam will be an objective type question paper consisting of 100 multiple choice questions and the time duration will be given is of 90 minutes for accomplish the written test. On every wrong choice selection their also a negative marking procedure will held according to which 1/3 mark will be deducted from the total scoring marks. The Railway Technician Exam 2012 is soon going to conduct by the Indian Railways recruitment Board and the question paper will be in different languages English, Hindi and the local languages.
Technician Syllabus - The Question paper will includes the following subjects as core subjects on which the various types of question will be asked -
- General Knowledge....click here...
- General Intelligence
- Arithmetic Ability
- Reasoning Ability... click here..
- Technical Ability (Pertained to the applied post)
SIGNALS
1.What does AM mean?
Analog Modulation
2.What frequency range is the High Frequency band?
3 to 30 MHz
3.What does EPROM stand for?
Erasable Programmable Read Only Memory
4.Which is a type of Electrically-Erasable Programmable Read-Only Memory?
Flash
5.What does the term PLC stand for?
Programmable Logic Controller
6.Sometimes computers and cash registers in a foodmart are connected to a UPS system.
What does UPS mean?
Uninterruptable Power Supply
7.Which motor is NOT suitable for use as a DC machine?
Squirrel cage motor
8.What does AC and DC stand for in the electrical field?
Alternating Current and Direct Current
9.What does VVVF stand for?
Variable Voltage Variable Frequency
10. Made from a variety of materials, such as carbon, which inhibits the flow of current ?
Resistor
11.The FFT, a mathematical process, is used extensively in digital signal processing (DSP). For what word does the second "F" in FFT stand?
Fourier
12.The sampling rate, (how many samples per second are stored) for a CD is ?
44.1 kHz
13.Compact discs, (according to the original CD specifications) hold how many minutes of music?
74 mins
14.A given signal's second harmonic is twice the given signal's __________ frequency?
Fundamental
15.A differential amplifier amplifies the ---------- between two input
signals.
Difference
16.The average power (in watts) used by a 20 to 25 inch home color television is...?
70 W
17. If the picture is stretched or distorted up and down like a fun house mirror the circuit to adjust or repair is...?
Vertical
18.The electromagnetic coils on the neck of the picture tube or tubes which pull the electron beam from side to side and up and down are called a...?
yoke
19.The input used by an antenna or cable to a TV set uses frequencies called...?
RF
20.The transformer that develops the high voltage in a home television is commonly called a...?
Flyback
21.Most modern TV's draw power even if turned off. The circuit the power is used in does what function?
Remote control
22.In a color television set using a picture tube a high voltage is used to accelerate electron beams to light the screen. That voltage is about...?
25000 v
23.The NTSC (National Television Standards Committee) is also used in the country of...?
Japan
24. In the United States the television broadcast standard is...?
NTSC
25. Which of the following is an international protocol for lighting control?
DALI
FIND OUT BY YOUR OWN AND POST YOUR ANSWERS...:)
1.Noise of input signal in differential amplifier
a) increases
b) decreases
c) remains the soul
2. Cascaded differential amplifier requires level translator because of
a) impedance matching
b) isolating each stage
c) d.c.shift.
3. In case of constant current bias ,R1 is replaced by diodes D1 & D2 TO
a) increase the input impedance b) improve thermal stability
c) increase gain
4. If CMRR is high ,the wide variation of input within the tolerable
limits of the equipment makes output
a) high
b) low
c) the same
5. For a.c analysis of differential amplifier we use
a) h-parameters
b) r-parameters
c) none of above
6. For an Op-amp based wien Bridge Oscillator , if the
oscillations stops after a few cycles, then the cause is ---------------.
a) the amplifier gain is too high.
b) The loop gain is less than 1.
c) The loop gai is equal to 1.
d) The loop gain is greater than 1.
7.In all types of differential amplifier DC operating point
p) is not equal
q) is equal
r) is dependent on application
8. A single supply operational amplifier is
a) LM 318
b) MC 414
c) LM 324
9. The cascode amplifier is composed of direct coupled
a) CE-CB configuration
b) CC-CC configuration
c) CC-CB configuration
10. Input bias current is always is ________.
a) greater
b) equal
c) less than input offset current
11. If input frequency is exceed the slew rate the output will
be________.
a) distorted
b) not distorted
c) amplified
12. The operational amplifier can be nulled by _________.
a) using an offset voltage compensating network
b) using an error minimizing resistance
c) cutting off the power supplies
13. Open loop configuration of operational amplifier is not need for
_________.
a) linear operation
b) nonlinear operation
c) none of above
14. Slew rate is defined by________
a) dv/dt(max)
b) di/dt(max
c) none of the above
15. The slew rate has _______
a) positive temperature coefficient
b) negative temperature coefficient
c) none of the above
16. Operational amplifier offset voltage due to input bias circuit can be significantly
reduced if we use
a) offset compensatory network
b) offset minimizing resistance
17. The standard supply voltage for an ordinary operational amplifier is
_________
a) 15 volts
b) 13 volts
c) 12 volts
18. The input offset voltage _______ with negative feedback .
a) increases
b) decreases
c) does not change
19. Specified value of CMRR for 741 opamp is ________.
a) 30 dB
b) 40 dB
c) 90 dB
20. 741 opamp is a chip of type _________.
a) industrial
b) military
c) commercial
21. voltage follower is a special case of __________.
a) inverting configuration
b) non-inverting configuration
c) difference configuration
22. frequency response of differetiator is same as that of ______.
a) high pass filter
b) low pass filter
c) band pass filter
23. frequency response of integrator is same as that of ______.
a) high pass filter
b) low pass filter
c) band pass filter
24. voltage shunt configuration is nothing but ________
a) inverting configuration
b) non-inverting configuration
c) difference configuration
25. voltage series configuration is nothing but ________
a) inverting configuration
b) non-inverting configuration
c) difference configuration
26. the type of feedback used for closed loop configuration is _______
a) positive feedback
b) negative feedback
c) none of the above
27. instrumentation amplifier is used to amplify the output of
__________.
a) speaker
b) transducer
28. basic differentiator fails to work at ________.
a) low frequency
b) high frequency
c) medium frequency
29. basic integrator fails to work at ________.
a) low frequency
b) high frequency
c) medium frequency
30. In which of the following is an operational amplifier (op-amp)
used?
a) oscillators
b) filters
c) instrumentation circuits
d) all of the above
31. What is the difference output voltage of any signals applied to
the input terminals?
a) the differential gain times the difference input voltage
b) The common-mode gain times the common input voltage
c) the sum of the differential gain times the difference input
voltage and the common-mode gain times the common
input voltage
d) the difference of the differential gain times the difference
input voltage and the common-mode gain times the
common input voltage
32. What is the difference voltage if the inputs are an ideal in-
phase signal?
b) the differential gain times the input signal
c) the common-mode gain times twice the input signal
d) the common-mode gain times the input signal
33. The larger the value of CMRR, the closer the output voltage is to the difference input times the
difference gain with the common-mode signal being rejected
a) True
b) False
34. What is the voltage gain of the unity follower?
a) 0
b) 1
c) –1
d) infinity
35. What is the scale multiplier (factor) of a basic integrator?
a) R/C
b) C/R
c) –RC
d) –1/RC
36. Which of the following is (are) the result of gain reduction by a
feedback?
a) The amplifier voltage gain is a more stable and precise value.
b) The input impedance of the circuit is increased over that of the op-amp alone.
c) The output impedance is reduced over that of the op- amp alone.
d) all of the above
37. third order Butterworth low pass filter has upper cut off frequency of 1KHz.The gain of the
filter drops by -------- if frequency is increased to 2KHz.
a) 6db
b) 18 db
c) 20 db
d) 60 db.
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