BEL technical question paper
Bel sample electronics solves question paper
1. Match the following List I with List II
List I List II
1. PType Semiconductor a) Aluminium
2. Intrinsic Semiconductor b) Phosphorus
3. Trivalent c) Impure Semiconductor
4. Pentavalent d) Pure Semiconductor
a) 1d, 2a, 3c, 4
b) 1c, 2d, 3a, 4b -Answer
c) 1a, 2d, 3b, 4c
d) 1b, 2d, 3a, 4c
2. Hall effect used to measure
a) Electric field intensity
b) Capacitance
c) Conductivity of material -Answer
d) None of the above
3. Following truth table is correspond to
a) OR gate -Answer
b) AND gate
c) NAND gate
d) XNOR gate
4. Which one of the following gate is called as Universal gate
a) AND gate
b) XNOR gate
c) OR gate d
d) NAND gate -Answer
a) Half adder -Answer
b) Fulladder
c) Half subtractor
d) Full subtractor
6. The binary number 1010 is equivalent to the decimal number
a) 5
b) 6
c) 10 -Answer
d) 11
7. For what condition Buchholz relay gives an alarm?
a) Transformer tank below oil levels detected -Answer
b) Transformers tank above oil level detected
c) No oil detected
d) None of the above
8. The unit of conductivity is
a) Ohmmetre
b) Siemens/metre -Answer
c) Celcius
d) None of the above
9. A 50HZ 20 poles alternator will run at
a) Greatest speed
b) Smallest speed -Answer
c) Moderate speed
d) None of the above
10. A Stepup transformer used to increase
a) Frequency
b) Current
c) Voltage -Answer
d) None of the above
11. The LASCR operates like a
a) Varactor
b) Latch -Answer
c) Photo diode
d) LED
12. A negativeresistance, microwave device for oscillator application is
a) IMPATT diode
b) Step Recovery diode -Answer
c) Gunn diode
d) Schottky diode
13. The IMPATT diode operates at frequency range between
a) 10 100 -Answer
b) 20 200 GHZ
c) 5 500 GHZ
d) 2 50 GHZ
14. Slip for 3phase Induction motor is
Answer-C
