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NPCIL for Electrical & Electronics Engineering stream old papers

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Re: NPCIL for Electrical & Electronics Engineering stream old papers
Yes sure, here I am providing the NPCIL for Electrical & Electronics Engineering stream old papers. There are objective types of the questions available.
Q. which logic gate has the output is compliment of its input ——— a) OR b) AND c) NOT d) XOR Ans: NOT Q.no.of 2input multiplexers needed to construct a 210 input multiplexer……. a) 12 b) 31 c) 20 d) 16 Q.By adding inverters to the inputs and output of a AND gate we can obtain …………… a) OR b) AND c) NOT d) XOR Ans: XOR Q.how many NAND gates are needed to realize OR gate ————– a) 1 b) 2 c) 3 d) 4 Ans: 3 Q.which is the first integrated logic family ————— a) RTL b) DTL c) TTL d) none of these Q. Which logic gate has output high if and only if all inputs are low ———? a) NOR b) NAND c) XNOR d) AND Ans: NAND Q.According to Boolean algebra 1+A+B+C = a) A b) A+B+C c) 1 d) none of these Ans: 1 Q. If a=0x6db7 and b=0x2ae9 then what is the value of a”b————– a) binary number for 1001.1101? b) decimal number for 19? c) excess3 code for 29? Q.what is the value of A’+1 ? a) A b) A’ c) 1 d) none of these Ans: 1 Q.2 in 4 bit number one bit indicates sign of the number then the locations are from a) 8 to 8 b) 7 to 7 c) 16 to 16 d) None Q.Avalanche photo diode is used when compared to PIN diode bcz a)larger band width b)high sensitivity C)—— d)——– Q.some non zero DC voltage is to RC low pass circuit then the DC voltage in the output contains a) Same as in input b) Higher than input c) Zero d) Slightly increases Q.if the output of the gate is always high then the gates applied to this logic are 0,0 a) NAND and EXNOR b) NAND and NOR c) AND and XNOR d) OR and XOR Ans:a Q.Thermal Run away is not possible in FET bcz the flow of a)minority careers b)Transconductance c)_____ d)none Ans : minority careers Q.which of the following is/are true about 1′s and 2′s compements: i)In 1′s complement form. 0 has two representations ii)in 1′s complement, the magnitude of lowest number is equal to the magnitude of highest number iii)In 2′s complement, 0 has two representations a) i only b) i and ii c) iii only d) all of these Q.In the hybrid parameter model of a transistor reverse transfer voltage ratio and forward transfer current ratio are respectively given by: a) h11 and h21 b) h12 and h11 c) h21 and h11 d) None of these Q.The largest negative no can be represented with 8 bits in 2′s compliment representation? a)256 b)255 c)127 d)128 Ans: 128 Q. How many NAND gates required to implement AB+CD+EF a) 1 b) 2 c) 3 d) 4 Ans: 4 Q. Transparent latch is seen in which type of flip flop a) SR FF b) D FF c) JK FF d) D FF Ans: D FF Q. Odd parity generator uses which logic? a) Digital b) Analog c) Sequential d) none Q. Which type of ADC is fastest? a) SARC b) Counter type c) Intigrated type d) Flash ANS: Flash/Parallel Q. Which one of the following is fastest read/writable memory? a) PROM b) EEPROM c) Flash d) none Ans: Flash 8. In array programming which one is used a) SISD b) PISD c) MISD d) None Q.Which one of the following has high I/p impedance a) CC b) CB c) CE d) None Q. The maximum time allowed time for each flip flop for a mod 10 synchronous counter if each flip flop delay is 25ns. a) 25 ns b) 50 ns c) 100 ns d) none Q. The resolution for a DAC is given by 0.4% then no. of bits of DAC is a) 8 bits b) 16 bits c) 32 bits d) none Ans: 8 bits 41) The chip capacity is 256 bits, then the no.of chips required to build 1024 B memory Is a) 32 b) 16 c) 15 d) 4 Q. Which of the following are correct? 1)A flipflop is used to store 1bit of information 2)Race around condition occurs in JK flip flop when both the inputs are 1 3)Master slave flip flop is used to store 2 bits of information 4)A transparent latch consists of a D flip flop a) 1,2,3 b) 1,3,4 c) 1,2,4 d) 2,3,4 Ans: 1,2,4 Q. output resistance of ideal OP AMP is a) 0 b) 1 c) infinite d) very high ANS: 0 Q. CMRR of an OP AMP is given as 80db and Ad is 20000.Value of Acm will be a) 4 b) 8 c) 2 d) 1 Ans: 2 Q.Si,Ge lie in ……..block of periodic table a) III b) V c) IV A d) IV B Ans: IV A Q.to obtain 10 mV resolution on 5 V range how many bit DAC is to be used a) 4 b) 8 c) 16 d) 32 Q.% resolution of a 10 bit ADC a) 1.588% b) 0.392% c) 0.0978% d) 0.0244% Ans: 0.0978% Q.Efficiency of half wave rectifier a) 45% b) 50% c) 86% d) 100%
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Re: NPCIL for Electrical & Electronics Engineering stream old papers
As you want I am here giving you old placement paper of Nuclear Power Corporation of India Limited (NPCIL) for Electronics Engineering stream students.
Sample paper : 1. Power diode is generally made from a) Silicon b) Germanium c) Both d) None of these 2. When the both junction of NPN diode is reverse biased, then the diode is in which mode a) Active b) Cutoff c) Saturation d) inverted 3. Which transistor mode gives the inverted output a) Common Emitter b) Common Base c) Common Collector d) None of these 4. Which coupling gives the higher gain in case of amplifier a) Capacitor coupling b) Impedance coupling c) Transformercoupling 5. Which distortion is least objectionable in audio amplification a) Phase b) Frequency c) Harmonic d) Intermediation 6. A narrow band amplifier has a band pass nearly…………of central frequency a) 33.3% b) 10% c) 50% 7. Phase shift oscillator consists a) RL b) RC c) RLC 8. Multivibrater Produces a) Sine wave b) Square wave c) Smooth wave d) sawtooth 9. Convert the 101101 Binary number into octal no a) 65 b) 55 c) 51 d) 45 Ans: 55 10. 10 in BCD a) 10100 b) 1100 c) 010111 d) None of these Ans: None of these 11. Which PNP device has a terminal for synchronizing purpose a) SCS b) Triac c) Diac d) SUS 12. output resistance of ideal OP AMP is a) 0 b) 1 c) infinite d) very high ANS: 0 13. Free electron exists in which band a) 1 b) 2 c) 3 d) Conduction band 14. Ripple factor of half wave rectifier a) 1.21 b) 0.48 c) 0.5 15. Transistor that can be used in enhancement mode a) NPN b) UJT c) JFET d) MOSFET 16. Following contributes to harmonic distortion in Amplifier a) +Ve feedback b) –Ve feedback c) Defective active device 17. High cutoff frequency a) CB b) CC c) CE 18. Which is used as data selector? a) Encoder b) Decoder c) modulator d) Demodulator 19. Read write capable memory a) RAM b) ROM c) Both d) None of these 20.the radix or base of hexadecimal number system is ———– a) 8 b) 16 c) 5 d) none of these Ans: 16 21.the no of 1’s in the binary representation of the expression 162*9+162*7+16*5+3 are a) 10 b) 23 c) 6 d) 4 22. the no of latches in F/F are —— a) 1 b) 2 c) 3 d) 4 23.how many flipflops are required to construct Mod 12 counter a) 5 b) 4 c) 12 d) none Ans: 4 24. which logic gate has the output is compliment of its input ——— a) OR b) AND c) NOT d) XOR Ans: NOT 25.no.of 2input multiplexers needed to construct a 210 input multiplexer……. a) 12 b) 31 c) 20 d) 16 26.By adding inverters to the inputs and output of a AND gate we can obtain …………… a) OR b) AND c) NOT d) XOR Ans: XOR 27.how many NAND gates are needed to realize OR gate ————– a) 1 b) 2 c) 3 d) 4 Ans: 3 28.which is the first integrated logic family ————— a) RTL b) DTL c) TTL d) none of these 29. Which logic gate has output high if and only if all inputs are low ———? a) NOR b) NAND c) XNOR d) AND Ans: NAND 30.According to Boolean algebra 1+A+B+C = a) A b) A+B+C c) 1 d) none of these Ans: 1 31. If a=0x6db7 and b=0x2ae9 then what is the value of a”b————– a) binary number for 1001.1101? b) decimal number for 19? c) excess3 code for 29? 32.what is the value of A’+1 ? a) A b) A’ c) 1 d) none of these Ans: 1 33.2 in 4 bit number one bit indicates sign of the number then the locations are from a) 8 to 8 b) 7 to 7 c) 16 to 16 d) None 34.Which of the following are correct? 1)A flipflop is used to store 1bit of information 2)Race around condition occurs in JK flip flop when both the inputs are 1 3)Master slave flip flop is used to store 2 bits of information 4)A transparent latch consists of a D flip flop a) 1,2,3 b) 1,3,4 c) 1,2,4 d) 2,3,4 Ans: 1,2,4 35.some non zero DC voltage is to RC low pass circuit then the DC voltage in the output contains a) Same as in input b) Higher than input c) Zero d) Slightly increases 36.if the output of the gate is always high then the gates applied to this logic are 0,0 a) NAND and EXNOR b) NAND and NOR c) AND and XNOR d) OR and XOR Ans:a 37.Thermal Run away is not possible in FET bcz the flow of a)minority careers b)Transconductance c)_____ d)none Ans : minority careers 38.which of the following is/are true about 1’s and 2’s compements: i)In 1’s complement form. 0 has two representations ii)in 1’s complement, the magnitude of lowest number is equal to the magnitude of highest number iii)In 2’s complement, 0 has two representations a) i only b) i and ii c) iii only d) all of these 39.In the hybrid parameter model of a transistor reverse transfer voltage ratio and forward transfer current ratio are respectively given by: a) h11 and h21 b) h12 and h11 c) h21 and h11 d) None of these 40.The largest negative no can be represented with 8 bits in 2’s compliment representation? a)256 b)255 c)127 d)128 Ans: 128 41. How many NAND gates required to implement AB+CD+EF a) 1 b) 2 c) 3 d) 4 Ans: 4 42. Transparent latch is seen in which type of flip flop a) SR FF b) D FF c) JK FF d) D FF Ans: D FF 43. Odd parity generator uses which logic? a) Digital b) Analog c) Sequential d) none 44. Which type of ADC is fastest? a) SARC b) Counter type c) Intigrated type d) Flash ANS: Flash/Parallel 45. Which one of the following is fastest read/writable memory? a) PROM b) EEPROM c) Flash d) none Ans: Flash 46. In array programming which one is used a) SISD b) PISD c) MISD d) None 47.Which one of the following has high I/p impedance a) CC b) CB c) CE d) None 48. The maximum time allowed time for each flip flop for a mod 10 synchronous counter if each flip flop delay is 25ns. a) 25 ns b) 50 ns c) 100 ns d) none 49. The resolution for a DAC is given by 0.4% then no. of bits of DAC is a) 8 bits b) 16 bits c) 32 bits d) none Ans: 8 bits 50. The chip capacity is 256 bits, then the no.of chips required to build 1024 B memory Is a) 32 b) 16 c) 15 d) 4
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