Hello sir, I need M.S.E.B (Mahadiscom) Sub Engineer Sample question paper for electrical engineering. Can you provide me with that?

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MAHA DISCOM Model Questions for Electrical Engineering

1. Find the Fourier sine transform of f(x), where
f(x) = f(x) 1,0<x<a { 0, x>a
(a) 2/p (cos st / s) (b) 2/p (1 - cos as / s)
(c) 2 (1 - cos as) (d) None of these
2. A random variable X with uniform density in the interval 0 to 1 is Quantized as follows:
If 0 X 0.3, xq = 0
If 0.3 X 1, xq = 0.7
Where Xq is the quatized value of x
The root mean square value of the quantization noise is
(a) 0.573 (b) 0.198
(c) 2.205 (d) 0.266

There analog signals, having bandwidth 1200 Hz, 600 Hz and 600 Hz, are sampled at their respective Nyquist rates, encoded with 12 bit words, and time division multiplexed. The bit rate for the multiplexed signal is
(a) 115.2 kbps (b) 28.8 kbps
(c) 57.6 kbps (d) 38.4 kbps
Solution : The three analog Signals having BW 1200 Hz, 600Hz and 600 Hz are sampled at their respective Nyquist rate i.e. at 2400, 1200, 1200 sample/sec respectively.
The total of (2400 + 1200 + 1200) = 4800 sample/sec
The Bit rate = n. fs = (4800 sample/sec) x 12 = 57.6 Kbps
Where n = number of bit in a symbol
5. Find the correct match between group 1 and group 2.
Group I
P - [1 + km (t)] A sin (wct)
Q - km (t) A sin (wct)
R - A sin [ w'c + k]'-¥ m (t) dt
S - A sin [wct + k ' -¥ m (t) dt]
Solution :
Group II
W - Phase modulation
X - Frequency modulation
Y - Amplitude modulation
Z - DSB-SC modulation
Which of the following analog modulation scheme requires the minimum transmitted power and
minimum channel bandwidth?
(a) VSB (b) DSB-SC
(c) SSB (d) AM
7. A device with input x(t) and output y(t) is characteristic by : y (t) = x2(t). An FM signal with frequency deviation of 90 KHz modulation signal bandwidth of 5 KHz is applied to this device. The bandwidth of the output signal is
(a) 370 KHz (b) 190 KHz
(c) 380 KHz (d) 95 KHz
A carrier is phase modulated (PM) with frequency deviation of 10 KHz by a single tone frequency of 1 KHz. If the single tone frequency is increased to 2 KHz, assuming that phase deviation remains unchanged, the bandwidth of the PM signal is
(a) 21 kHz (b) 22 kHz
(c) 42 kHz (d) 44 kHz

Mahadiscom Model paper Electrical Engineering