MTNL Placement Paper 2016 With Solution
Question 1:
What changes would be necessary in block C if FM signals are to be received –
A. Block becomes redundant
B. A FM detector would be required
C. A high frequency signal generator
D. An additional local oscillator will be needed
Ans. B
Question 2:
In the equatorial plane only Geosychronous satellite are launched because it is the only plane which provides –
A. 24 hour orbit
B. stationary satellite
C. global communication
D. zero-gravity environs
Ans. B
Question 3:
Radio Broadcasting is an example of –
A. space multiplexing
B. time multiplexing
C. frequency multiplexing
D. none of the above
Ans. C
Question 4:
PAM signals can be demodulation by using a –
A. Low pass filters (LPE) alone
B. A Schmitt trigger followed by a LPF
C. A differentiator followed by a LPF
D. A clipper circuit by a LPF
Ans. D
Question 5:
In an FDM receiver channels can be separated by using –
A. AND gates
B. Band pass
C. differentiation
D. Integration
Ans. A
Question 6:
The most common modulation system used for telegraphy is-
A. frequency shift keying
B. two – tone modulation
C. pulse code modulation
D. single tone modulation
Ans. A
Question 7:
Use of varoctor diode in generation of modulated segial be-
A. FM generation only
B. 100AM generation only
C. PM generation only
D. both PM and AM generation
Ans. A
Question 8:
In colour picture tube shadow mask is used to
A. reduce x-ray emission
B. ensure that each beam strikes only its own dots
C. increase screen brightness
D. provide degaussing for the screen
Ans. C
Question 9:
The circuit that separates composite video warefore from the sync pulses is-
A. the keyed AGC amplifar
B. a clipper
C. an integrator
D. a sawtooth current
Ans. D
Question 10:
Band width of microwaves is-
A. 1GHz -10 ^ 3 GHz
B. 1GHz -100 GHz
C. 1 GHz -10 GHz
D. 1 GHz – 10 ^ 6 GHz
Ans. A
Question 11:
In transverse Magnetic mode-
A. no electric line is in direction of propagation
B. no magnetic line is in direction of propagation
C. bath magnetic & electric lines are is direction of propagation
D. neither magnetic nor electric lines in direction of propagation
Ans. B
Question 12:
Signal transmission in sky wave propagation is due to –
A. Refraction of wave
B. Reflection of wave
C. Pierus through Inosphere
D. None
Ans. B
Question 13:
According to Barkhausen Criterion Phase shift of signal should be –
A. 60 degree
B. 90 degree
C. 180 degree
D. 360 degree
Ans. D
Question 14:
The transmission does not have –
A. Partition noise
B. Flicker noise
C. resistance
D. Short noise
Ans. A
Question 17
The main disadvantage of Diode-Transistor logic (DTL) is its-
A. greater speed
B. slower speed
C. average speed
D. none of the above
Ans. B
Question 18
Time delay Dt in digital signals in an SIS O shift register is given by –
A. Dt = N ‘ Fc
B. Dt = N ‘ 1/Fc
C. Dt = 1/N ‘ Fc
D. Dt = N ‘ 1/Fc
Ans. B
Question 19:
The output Qn is 1 in a JK flip flop and it does not change when clock pulse is applied) The possible combination of Jn and Kn can be -(y denotes don’t care)
A. y and 0
B. y and 1
C. 0 and y
D. 1 and y
Ans. A
Question 20:
Basic memory cell of dynamic RAM consists of –
A. a flip flop
B. a transistor acting as a capacitor
C. a transistor
D. a capacitance
Ans. B
Question 21:
The 2’s complement of 1000 base 2 is –
A. 0111
B. 0101
C. 1000
D. 0001
Ans. C
Question 22:
Master slave flip-flop is made up of –
A. two flip flops connected in series
B. two flip flops connected in parallel
C. a debouncer circuit
D. a-D- latch
Ans. A
Question 23:
Number of nybbles making one byte is –
A. 2
B. 4
C. 8
D. 16
Ans. A
Question 24:
The intrinsic impedance of free space-
A. is independent of frequency
B. decreases with increase of frequency
C. increases with increase of frequency
D. varies as square root of frequency
Ans. A
Question 25:
A system consists of 12 poles and 2 zeroes. Its high frequency asymptote in its magnitude plot has a slope of –
A. -200 dB/decade
B. -240 dB/decade
C. -230 dB/decade
D. -320 dB/decade
Ans. A
Question 28:
Considering the conditions-
1. High loop gain
2. Less ringing
3. Greater damping
4 Negative dB gain margin
System stability requirements would include
A. 1 and 3
B. 1, 2 and 3
C. 1 and 4
D. 2, 3 and 4
Ans. D
Question 30:
Varoctor diode has non linearity of –
A. capacitance
B. Inductance
C. Resistance
D. Is a linear device
Ans. A