MTNL Placement Papers of 2015

Question 1:

What changes would be necessary for block C if FM signals are to be received –

A. Block becomes redundant
B. An 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 color 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 warfare from the sync pulses is-

A. the keyed AGC amplifier
B. a clipper
C. an integrator
D. a sawtooth current

Ans. D

Question 10:

Bandwidth 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

You can also see: HSBC Placement Papers

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

You can also see: Motorola Placement Papers

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


About MTNL

Mahanagar Telephone Nigam Limited (MTNL) is a state-owned telecommunications service provider in the metro cities of Mumbai and New Delhi. MTNL was set up on 1st April 1986 by the Government of India to upgrade the quality of telecom services, expand the telecom network, introduce new services. The Government of India currently holds 100% stake in the company.

MTNL is providing telecommunications beyond boundaries through its Joint Ventures and Subsidiaries. MTNL is present in Nepal through its Joint Venture United Telecom Limited (UTL) and in Mauritius through its 100% subsidiary Mahanagar Telephone Mauritius Limited (MTML).