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1st March 2015, 04:21 PM
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| Re: Nuclear Power Corporation of India Ltd Executive Trainee previous year question p
The Nuclear Power Corporation of India Limited (NPCIL) invites applications from Engineering Graduates to join NPCIL as Executive Trainee. You are asking for the Nuclear Power Corporation of India Ltd Executive Trainee previous year question paper. Here I am uploading a file that contains the NPCIL Executive Trainee previous year question paper. You can download this from here. Q. Power diode is generally made from a) Silicon b) Germanium c) Both d) None of these Q. 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 Q. Which transistor mode gives the inverted output a) Common Emitter b) Common Base c) Common Collector d) None of these Q. Which coupling gives the higher gain in case of amplifier a) Capacitor coupling b) Impedance coupling c) Transformercoupling Q. Which distortion is least objectionable in audio amplification a) Phase b) Frequency c) Harmonic d) Intermediation Q. A narrow band amplifier has a band pass nearly…………of central frequency a) 33.3% b) 10% c) 50% Q. Phase shift oscillator consists a) RL b) RC c) RLC Q. Multivibrater Produces a) Sine wave b) Square wave c) Smooth wave d) sawtooth Q. Convert the 101101 Binary number into octal no a) 65 b) 55 c) 51 d) 45 Ans: 55 Q. 10 in BCD a) 10100 b) 1100 c) 010111 d) None of these Ans: None of these Q. Which PNP device has a terminal for synchronizing purpose a) SCS b) Triac c) Diac d) SUS Q. Addition of indium in semiconductor crystal makes a) PNP b) NPN Q. Free electron exists in which band a) 1 b) 2 c) 3 d) Conduction band Q. Ripple factor of half wave rectifier a) 1.21 b) 0.48 c) 0.5 Q. Transistor that can be used in enhancement mode a) NPN b) UJT c) JFET d) MOSFET Q. Following contributes to harmonic distortion in Amplifier a) +Ve feedback b) –Ve feedback c) Defective active device Q. High cutoff frequency a) CB b) CC c) CE Q. Which is used as data selector? a) Encoder b) Decoder c) modulator d) Demodulator Q. Read write capable memory a) RAM b) ROM c) Both d) None of these Q.the radix or base of hexadecimal number system is ———– a) 8 b) 16 c) 5 d) none of these Ans: 16 Q.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 Q. the no of latches in F/F are ——- a) 1 b) 2 c) 3 d) 4 Q.how many flip-flops are required to construct Mod -12 counter a) 5 b) 4 c) 12 d) none Ans: 4 Q. which logic gate has the output is compliment of its input ———- a) OR b) AND c) NOT d) X-OR Ans: NOT Q.no.of 2-input 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) X-OR Ans: X-OR 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) X-NOR 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) excess-3 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 EX-NOR b) NAND and NOR c) AND and X-NOR 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 flip-flop is used to store 1-bit 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 1) Special soft are to create a job queue is called a) driver b) spooler c) interpreter d) linkage editer 2)When a process is rolled back as a result of deadlock the difficulty arises is a) Starvation b) System throughput c) low device utilization d) cycle stealing 3)On recieving an interrupt from an I/O device the CPU a) Halts for a predefined time. b) Branches off the interrupt service routine after completion off the current instruction. c) Branches off to the interrupt service routine immediately. d) hands over the control of address bus and data bus to the interrupting service. 4) Which of the following is true of the auto increment addressing mode? 1. It is useful in creating sef relocating code. 2)If it is induced in an instruction set architecture , than an additional ALU is required for effective address calculation. 3) The amount of increment depends on the size of the data item accessed. a) 1 only. b)2 only c) 3 only d) 2 and 3 only 5) Theprimary purpose of an operating system is a) To make the most efficient use of the computer hardware. b) to allow people to use the computer. c) To make the system programmers employed. d) to make computers easy to use. 6)consider the cpu intensive processes which require 10,20,30 time units and arrive at time 0,2,6 respectively.how many context switches are needed if the operating system impements a shortest remaining time first sceduling algorithm?Do not count the context switches at the time 0 and end. a) 1 b) 2 c) 3 d) 4 7) consider a system having n resources of the same type.These resources are shared by 3 processes A,B,C .These have peak demands of 3,4,6 respectively.For what value of n deadlock won’t occour. a) 15 b) 9 c) 10 d) 13 In which addressing mode the effective address of the operand is computed by adding a constant value to the content of the register? a) absolute mode. b) indirect mode c) immediate mode d) index mode 9)the process of organizing the memory into two banks to allow 16 bit and 8 bit data operation is called a) bank switching b) indexed mapping c) two way memory interleaving d) memory segmentation 10)a one dimensional array A has indices 1-75.Each element is a string and takes up three memory words. The array is stored in location 1120 decimal. The starting address of A[49] is a) 1267 b) 1164 c) 1264 d) 1169 11) The microsystems stored in the control memory of a processor have a width of 26 bits. Each microinstruction is divided into three fields : a microoperation field of 13 bits, a next address field(X), and a MUX select field(Y). There are 8 status bits in the inputs of the MUX.How many bits are there in the X and Y fields and what is the size of the control memory in number of words? a) 10,3,1024 b) 8,5,256 c) 5,8,2048 d) 10,3,512 12)The use of multiple register windows with overlap causes a reduction in the number of memory accesses for 1.function locals and parameters 2. register saves and restores. 3. instruction fetches. a) 1 only b) 2 only c) 3 only d) 1,2,and 3 13)Which of the following about relative addressing mode is false? a) it enables reduced instruction size. b) it allows indexing of array element with same instruction. c) it enabkles easy relocation of data. d) it enables faster address calculation than absulute addressing. 14)Substitution of values for names (whose values are constants) is done in ‘ a) local optimization b) loop optimization c) constant folding d) strength reduction 15)A root a of eq f(x)=0 can be computed to any degree of accuracy if a good initial approximation x0 is chosen for which a) f(x0)>0 b) f(x0)f”(x0)>0 c) f(x0)f”(x0)<0 d) f”(x0)>0 16) consider the polynomial p(x)=a0+a1x+a2x*x+a3x*x*x. The mininum 1.If sampling frequency doubles then a) Quantization noise decreases b) Quantization density decreases c) Quantization noise increases d) Quantization density increases 2. Two signals of 2GHz and 4GHz are frequency modulated on same carrier 10 GHz. Find the ratio of frequency deviation if band widths of both are equal. a) 1:2 b)2:1 c) 1:1 d) 1:4 3. Gray code of 111 is 4. 3X512+7X64+5X8+3 then value in binary form contains _______ number of 1’s. a) 7 b) 6 c) 9 d) none 5. The 2’s compliment of decimal number 19 in 8-bit system is a) 11101101 6) The high gain codes are a) Turbo codes b) BCH codes c) R-S codes 7) BCH codes are of the type________ a) Convolutional type b) c) Time constant of LC circuit is a) L/R b) L/R2 c) RL 9) If R is doubled and C is halved then frequency of series RLC circuit is 10) The solution for the equation (D2+4) y=sin2x is 11) Laplace Tramsform of sin3x is 12) The Z-transform for the series is X [n] = { 7; n= -1 {5 n=0 { 1 n=1 {0 else 13) The magic Tee is a a) 4 port tee b) c) 14) The register which holds the address of the next instruction is a) Program counter b) c) 15) The antenna gain is given by……………? 16) The satellite is in 630km orbit and transmitting at a frequency 5 MHz, when satellite is on your head the Doppler shift is——– a) b) c) 0 d) 17) The impedance of a lossless transmission line is a) √(L/C) 18) A 50Ώline with load impedance 100Ώ the VSWR is 19) In a waveguide measurement, the forward power is 10mW, the reverse power is 1mW then VSWR is _____________ 20) Transmitted power is 100W, gain of the transmitter antenna is 30 dB and the path loss is 50 dB then received power is 21) When transmitted power is 100mW and the path loss 100 dBm then received power is a) -80 dBm 22) When a em wave is incident normally on a perfect conductor then a) Totally reflected b) partially reflected c) Totally transmitted d) none. 23) Zsc =100Ώ Zoc =1Ώ then Zo is a) 1Ώ b) 10Ώ c)___d)__ 24) When the operating wavelength of line is /4< < /2, the impedance is a) Capacitive b) inductive c) ____ D) none 25) The value of L if source is 50V AC of 10 KHz frequency and current is 7.96 A. a) ____ 26) The resonant frequency is 50MHz bandwidth 100 KHz then Q factor is a) ______ b)_______ c)….. 27)The Q factor of a series RLC circuit is a)……b)…… 28) Q value of a parallel RLC circuit is ________ a)……b)…. 29) If the lines x+y+3=0, x-2y+7=0, 2x+ky+5=0 are required to be concurrent then the value of k is___ a) ___ b)….. 30) The vectors i-2j+k, 2i+3j-k,R are the complete, then r is given by ______ 31) If a satellite revolving with angular velocity w and the velocity is v then Curl v is _______ a) w b) 2w c) w 2 d) ….. 32) If each stage amplifier contains 10dB gain the figure of merit of 2-stages is Given by …… 33) The maximum rate possible in kbps if F=15 and bandwidth is 4 KHz is……. 34) The maximum time allowed for each flip flop for a ripple counter of mod-1024 , if clock given to it is 1MHz is …….. 35) 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 36) The high speed for CML gate is due to operating it in ——— region. a) non saturation 37)In a micro processor the wait states are inserted to a) make the processor to wait during DMA operation b) make the processor to wait during an interrupt processing c) make the processor wait during a power shutdown. d) interface the slow peripherals to the processor. 38) In a digital voltmeter the ADC’s used are of type 1. successive 2.flash type 3. Dual slope in ascending order of time is 1. a) 2,1,3 b) 1,2,3 c) 3,1,2 d) none 39) The number of NAND gates are required to implement A B (XOR), assuming compliments not available …………. 40) The resolution for a DAC is given by 0.4% then no. of bits of DAC is a) 8- bits 41) The chip capacity is 256 bits, then the no.of chips required to build 1024 B memory Is………. 1. a) 32 b) 16 c) 15) 42) Which of the following are correct? 1. A flip-flop is used to store 1-bit 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 (ANS) c)1,2,4 d) 2,3,4 43) The bit rate of a QPSK compared to BPSK is a)half b) double c) same 44) There are 5 red balls and 5 black balls in a box. The probability to select 2 balls one after other without reputting is, a) 2/9 b) 1/90 c) 11/90 d) none 45) The rms voltage is obtained by multiplying peak by a factor a) 1/√2 1. Mho relay is usually employed for the protection of a) Short lines only b) Medium lines only c) Long lines only d) Any line Ans: Long lines only 2. A modern power semiconductor device IGBT is combines the characteristics of a) BJT and MOSFET b) FCT and GTO c) SCR and MOSFET d) SCR and BJT Ans: BJT and MOSFET 3. For a single-phase a.c. to d.c. controlled rectifier to operate in regenerative mode, which of the following conditions should be satisfied? a) Half –controlled bridge, a < 90°, source of e.m.f. in load b) Half-controlled bridge, a > 90°, source of e.m.f. in load c) Full-controlled bridge, a > 90°, source of e.m.f. in load d) Full-controlled bridge, a < 90°, source of e.m.f. in load Ans: Full-controlled bridge, a > 90°, source of e.m.f. in load 4. Which is the most suitable power device for high frequency ( more 100 kHz) switching application? a) Power MOSFET b) BJT c) SCR d) UJT Ans: Power MOSFET 5. In a thyristor Latching current is ________ than Holding current a) Equal b) Less c) Greater d) None Ans: Greater 6. The transfer function of a system is 10/(1+s) when operating as a unity feedback system, the steady state error to a step input will be a) 0 b) 1/11 c) 10 d) Infinity Ans: 1/11 7. Which one of the following statements for a dc machine which is provided with inter pole winding (IW) as well as compensating winding (CW) is correct a) Both IW and CW are connected in series with Armature winding b) Both IW and CW are connected in parallel with Armature winding c) IW connected in series but CW is connected in parallel with Armature winding d) CW connected in series but IW is connected in parallel with Armature winding Ans: Both IW and CW are connected in series with Armature winding 8. A 0-10 mA PMMC ammeter reads 5mA in a circuit; its bottom control spring snaps out suddenly the meter will now read. a) 5mA b) 10mA c) 2.5mA d) 0 Ans: 0 9. A dc cumulatively compounded motor delivers rated load torque at rated speed. If series field is short circuited, then the armature current and speed will a) Both increases b) Both decreases c) Increases and decreases d) Decreases and increases Ans: Both increases 10. Moving coil in dynamometer wattmeter connected a) In series with fixed coil b) Across supply c) In series with load d) Across load Ans: Across supply 11. In an induction machine, if the air gap increased a) Speed will be reduced b) Efficiency will be improved c) Power factor will be lowered d) Breakdown torque will be reduced Ans: Power factor will be lowered 12. A CRO screen has ten divisions on the horizontal scale. If a voltage signal 5 sin 314t+45 deg)is examined with a line base settings of 5 msec/div, the number of cycles of signal displayed on the screen will be a) 0.5 cycles b) 2.5 cycles c) 5 cycles d) 10 cycles Ans: 2.5 cycles 13. A 3-phase 50HZ SCIM takes a power input of 30 KW at its full load speed of 1440 rpm. Total stator losses are 1 KW. The slip and rotor ohmic losses at full load are a) 0.02, 600 W b) 0.04, 580 W c) 0.04, 1160 W d) 0.04, 1200 W Ans: 0.04, 1160 W 14. Thermocouple is used to measure a) AC b) DC c) Both d) None Ans: Both Technical Electrical Question Paper Model Placement Paper[/url] 15. The two watt meters measurement the ratio of two meter readings is –(1-sqrt3)  1+sqrt3) then the power factor isa) 1 b) 0.866 c) 0.707 d) 0 Ans: 0.707 16. Hays bridge is used to measure___________ and Schering bridge is used to measure____________ a) Inductance, Inductance b) Inductance, Capacitance c) Capacitance, Inductance d) Resistance, Capacitance Ans: Inductance, Capacitance 17. When sine wave is given as input to Schmitt trigger then its generates a) Sine wave b) Saw tooth wave c) Triangle wave d) Square wave Ans: Square wave 18. In Gauss Seidel method the following factors are influenced for operation a) Acceleration factor b) Selection of slack buss c) Both d) None Ans: Selection of slack buss* 19. i. (X +Y ) A. Low-pass filter function ii. (X Y ) B. Sum iii. (XY) C. NAND D. Carry E.NOR a) i-C, ii-E, iii-D b) i-C, ii-E, iii-B c) i-C, ii-B, iii-D d) i-C, ii-E, iii-A Ans: i-C, ii-E, iii-D 20. The phase lead compensation is used to a) Increase rise time and decrease overshoot b) Decrease both rise time and overshoot c) Increase both rise time and overshoot d) Decrease rise time and increase overshoot Ans: Decrease rise time and increase overshoot 21. Voltage feed back amplifier is a a) Shunt-Shunt b) Shunt-Series c) Series-Shunt d) Series- Series Ans: Shunt-Shunt 22. In microprocessor the next instruction to be executed is stored in a) Program Counter b) Stack Pointer Last edited by Kiran Chandar; 1st March 2015 at 04:36 PM. |