NPCIL ET Exam Solved Question Papers

I am looking for the solved question papers of the NPCIL ET Exam?

Nuclear Power Corporation of India Limited (NPCIL) conducts the exam for the posts of Deputy Manager (HR), Deputy Manager (F& A), Deputy Manager (C& MM)& Deputy Manager (Hospitality Services).

Sample Questions:


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. 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

15. The two watt meters measurement the ratio of two meter
readings is –(1-sqrt3) 1+sqrt3) then the power factor is
a) 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

As you are looking for NPCIL ET Exam Question Papers so here I am telling you that question for this exam will come from following topics

Data link protocols
End-End protocols
Frequency domain analysis of RLC circuits
Message routing technologies
Network graphs
Network interconnection
Network theorems
Solution of network equations using Laplace transforms
Steady state sinusoidal analysis
Time domain analysis of simple RLC circuits

Analog Circuits

Diodes
Bipolar Junction Transistors
Amplifiers
Feed back amplifiers
Large signal amplifiers
Filters
Oscillators
Power supplies
Pulse shaping circuits
Sinusoidal oscillators

Circuit Analysis

Sinusoidal steady state analysis
Thevenin’s and Norton’s equivalent circuits
DC Circuit analysis
Transient and resonance in RLC circuits

Digital Electronics

Combinational circuits
Logic gates
Sequential circuits

Linear Integrated Circuits

A/D and D/A converters
Operational amplifiers and its applications
PLL
Voltage regulators

Electronic Devices

Energy bands in silicon
Carrier transport in silicon
Tunnel diode
MOS capacitor
JFET
MOSFET
Basics of LASERs
BJT
Zener diode
Device technology

Measurements and Instrumentation

Digital Instruments
Display and Recording systems
Transducers

Signals and Systems

Laplace transform
Signal transmission through LTI systems
Fourier series
Continuous-time and discrete-time Fourier Transform
Sampling theorem
Linear Time-Invariant (LTI) Systems

Microprocessor

Microprocessors-8085 architecture
Microprocessors- 8086 architecture
Micro-controller

Electromagnetic Fields

Time varying Electric and Magnetic fields
Static Electric and Magnetic fields
Maxwell equations

Control Systems

Basic control system components
Open loop and closed loop systems
Signal flow graphs
Steady state analysis of LTI control systems
Tools and techniques for LTI control system analysis

EM waves and waveguides

Rectangular and cylindrical waveguides
Guided waves

Communications

Analog communication systems
Base band signaling
Channel capacity theorem
Continuous time signals and systems
Differential pulse code modulation (DPCM)
Digital communication systems
Discrete time signals and systems
Error control coding
Fundamentals of information theory
Optical Communication
Pulse code modulation (PCM)
Random signals and noise

Antennas and Propagation

Arrays
Propagation of radio waves
Aperture antennas
Dipole antennas
Radiation pattern
Antenna gain

Microwave Engineering

Microwave measurements
Microwave tubes
Passive components
Semiconductor devices

Electromagnetics

Characteristic impedance
Divergence and curl
Gauss’ and Stokes’ theorems
Impedance transformation
Maxwell’s equations
Propagation in dielectric waveguide
Propagation in optical fibers
Transmission lines
Vector calculus
Wave equation

Digital Signal Processing

IIR and FIR filters
Quantization effects
Realization and implementation

For question paper I am providing PDF which have attached below:

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. 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
15. The two watt meters measurement the ratio of two meter
readings is –(1-sqrt3) 1+sqrt3) then the power factor is
a) 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

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

__________________
Answered By StudyChaCha Member

Sir can you tell me NPCIL ET question paper and syllabus for mechanical engg

Sir can you tell me NPCIL ET question paper and syllabus for mechanical engg and mail to rk27101992@gmail.com

plz send me npcil et entrance xam previous papers.my mail id ravinutalasindhu@gmail.com

Please send me npcil exam for executive trainee previous year question papers . My email id is mahatosumitra.02@gmail.com.