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January 29th, 2016, 01:09 PM
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Join Date: Mar 2012
Re: Bharat Electronics Limited Probationary Engineer previous year question papers

The previous years question paper for the Bharat Electronics Limited Probationary Engineer recruitment examination is as given below:

BEL Technical Questions

1. What is the resolution of a digital-to-analog converter (DAC)?
A. It is the comparison between the actual output of the converter and its expected output.
B. It is the deviation between the ideal straight-line output and the actual output of the converter.
C. It is the smallest analog output change that can occur as a result of an increment in the digital input.
D. It is its ability to resolve between forward and reverse steps when sequenced over its entire range.
Ans:C

2. Mod-6 and mod-12 counters are most commonly used in:
A. frequency counters
B. multiplexed displays
C. digital clocks
D. power consumption meters
Ans:C

3. A series of gradually decreasing sine wave oscillations is called:
A. Ringing
B. slew
C. overshooting
D. undershooting
Ans:A

4. Pinch-off voltage VP for an FET is the drain voltage at which
A. significant drain current starts flowing
B. drain current becomes zero
C. all free charges get removed from the channel
D. avalanche break down takes place
Ans:C

5. Compared to bipolar transistor, a JFET has
A. lower input impedance
B. higher voltage gain
C. higher input impedance and high voltage gain
D. higher input impedance and low voltage gain
Ans

6. A common instrument used in troubleshooting a digital circuit is a(n) ________.
A. logic probe
B. oscilloscope
C. pulser
D. all of the above
Ans

7. How many valence shell electrons are there in semiconductor atoms?
A. 16
B. 8
C. 4
D. 2
Ans:C

8. Kirchhoff's current law for parallel circuits states that the:
A. sum of all branch voltages equals zero
B. total circuit resistance is less than the smallest branch resistor
C. sum of currents into a junction is equal to the difference of all the branch currents
D. sum of the total currents flowing out of a junction equals the sum of the total currents flowing into that junction
Ans

9. A parallel circuit is also used as a divider for:
A. Conductance
B. voltage
C. power
D. current
Ans

10. What is a characteristic of a secondary cell?
A. rechargeability
B. not rechargeable
C. a dry cell
D. non-liquid
Ans:A

11. Telex is a

A Telephone Service between various subscribers

B Tele printer Service between various subscribers

C Television Service between various subscribers

D Telegraph Service between various subscribers

Ans: B

12. Data can be changed from special code to temporal code by using

A. Shift registers
B. counters
C. Combinational circuits
D. A/D converters.

Ans: A

13. in digital ICs, Schottky transistors are preferred over normal transistors because of their

A. Lower Propagation delay.
B. Higher Propagation delay.
C. Lower Power dissipation.
D. Higher Power dissipation.

Ans: A

14. Which TTL logic gate is used for wired ANDing

A. Open collector output
B. Totem Pole
C. Tri state output
D. ECL gates

Ans: A

15. The number of point to point links required in a fully connected network for 50

entities is

A. 1250
B. 1225
C. 2500
D. 50

Ans: C

16. Telephone companies normally provide a voltage of __________to power

telephones.

A. +24 volts DC
B. -24 volts DC
C. +48 volts DC
D. -48 volts DC.

Ans: D

17. The situation when both transmitter and receiver have to work in tandem is referred

to as

A. parallel
B. serial
C. synchronous
D. asynchronous

Ans: C

18. The ________is a circuit-switched network, while the ______is a packet-switched

network.

A. Telephone, ATM
B. SONET and FDDI
C. Satellite, Telephone
D. FDDI and SONET

Ans: A

19. ISDN handles data pertaining to

A. All digital services
B. Speech and Video
C. Computer data only
D. Speech only
Ans:A

20. Typical human voice is centered around ________Hz.

A. 200-400
B. 280-3000
C. 400-600
D. 1400-1800
Ans: B


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