Old Paper of UPPCL

Hello sir would you please provide me question paper of Uttar Pradesh Power Corporation Limited Junior Engineer Electronics and Communication Engg???

[Kiran Chandar]

As you are looking for the question paper of Uttar Pradesh Power Corporation Limited of Junior Engineer Electronics and Communication Engg so here I am providing you the same, please have a look

what is the advantages and dis advantages of critical speed of turbine

What will happen if oil is mixed with boiler feed water?

What are the differences between heat transfer and mass transfer?

in what cycle steam power plant is based

how can calculate how much steam is to be required for generation of 1MW
electricty?

what is ERW PIPE & Seamless PIPE Out of ERW and Seamless which one gives good

results for an impact force of 2700 N??

What are the protections required to protect turbine?

what is the difference between suction lift & suction head?

what is the defination of an ideal fluid?

What is the knee point of voltage of CT?

how fault in an electric system is detected & hw protection of equipments is done ?

How the cable size for a motor is decided

In a Synchronous generator, Can AC voltage be used instead of DC voltage in field
winding of rotor to produce AC power?

what happen ,if generator will generate leading power factor?

In microprocessors, what does the mnemonic SKIP do?

The peripherals of the computer(like keyboard, monitor) are connected through
buses directly or is there any interfacing device present in the CPU?

what is the difference between squirrel cage & slip ring induction motor?

Why a transformer Noise during its running condition ?

how do you come to know air is fully saturated

1)Why electric shock is feel ?? n in a Electric Train why we didnt feel that ?

2)What is the reason for transformer Noise ??

3)What is relation b/w Transmission Lines & Communication Lines ?

4)Which material is used for making Transformer oil & How u measure its dielectric
strength & Name the test ?
an ice block submurged in the water, if the ice melt level of water

1. Given four unit-circle plots identify the one corresponding to a bandpass filter.

2. A 4 kHz signal is sampled at thrice the Nyquist rate and sent through a channel
with error ?1%. Calc the bandwidth of the channel.

3. Given a two port network in the form of a T find o/p admittance in terms of yparameters.

4. Connect two 1? resistors in series, then connect two 1H inductors across one of
the resistors such that the ckt looks like a 1? resistor in series with a ?-section of a
resistor and two inductors. With the series resistance on the i/p side, calc the
transfer function of this ckt

5. Inverse laplace transform of 1/s2[d/ds(e-3s/s)]

6. Lower useful input limit of a transducer is determined by…

7. Air-cored inductors are used for low frequency/high frequency/equal frequency
operations.

8. Given 4 pole-zero plots identify which one corresponds to the driving point
impedance of a series resonant ckt.

1. With fixed value capacitor C and variable voltage V across it, the
energy stored in the capacitor is
a) CV2 b) 0.5 CV2 c) 2 CV2 d) CV Ans.
2. A dc voltage V is applied to a series RL circuit. The steady state current
is
a) V/R b) V/L c) 2+ 2 d) Zero Ans. 5. If the unit step response of a system is a unit impulse function, then
the transfer function of such a system will be
a) 1 b)1 c)s d)12 Ans. 10. Of the following transfer function of second order linear timeinvariant
systems, the underdamped system is represented by
a)H(S)= 1 2+4 +4 b)H(S)= 1 2+5 +4 c)H(S)= 1 2+4.5 +4 d)H(S)= 1 2+3 +4 Ans.
11. A differential amplifier has a differential gain of 20,000. CMRR = 80
dB. The common mode gain is given by

a) 2 b) 1 c) 1/2 d)0 Ans.
12. Two bulbs marked 200 waft — 250 volts and 100 watt-250 volts are
joined in series to 250 volt supply. Power consumed in circuits is
a) 33 watt b) 67 watt c) 100 watt d) 300 watt Ans. 17. A half — adder can be constructed using two 2- input logic gates. One
of them is an AND- gate, the other is
a)OR b)NAND c)NOR d)EX-OR Ans.
18. For one of the following conditions, clocked J-K flip-flop can be used
as DIVIDE BY 2 circuit where the pulse train to be divided is applied at
clock input.
a) J= 1, k = 1 and the flip-flop should have active HIGH inputs b)J= 1, k = 1 and the flip-flop should have active LOW inputs c)J= 0, k = 0 and the flip-flop should have active HIGH inputs d)J= 1, k = 1 and the flip-flop shouldbe a negative edge triggered one Ans.
19 Number of comparators needed to build a 6-bit simultaneous A/D
converter is
a)63 b) 64 c) 7 d) 6

Ans.
20. The AID converter used in a digital voltmeter could be (1) successive
approximation type (2) Flash converter type (3) Dual slope converter
type. The correct sequence in the increasing order of their conversion
time taken is
a) 1, 2, 3 b)2,1,3 c)3,2,1 d) 3,1,2 Ans. 22. Which of the following binary number is equal to octal number 66.3
a) 101101.100 b) 1101111.111 C) 111111.1111 d) 110110.011 Ans. 26. A 4-bit presetable UP counter has preset input 0101. The preset
operation takes place as soon as the counter reaches 1111. The modulus
of the counter is
a)5 b)10 c)11 d)15 Ans.
27. A 4-bit synchronous counter uses flip-flops with propagation delay
time of 25 ns each. The maximum possible time required for change of
state will be
a) 25 ns b) 50 ns c) 75 ns d) 100 ns

Ans.
28. If a counter having 10 FFs is initially at 0, what count will if hold after
2060 Pulses
a) 000 000 1100 b) 000001 1100 c) 000001 1000 d)000000 1110 Ans.
33. Memory chips, which have 12 address lines and 4 data lines each.
The number of such chips required to design the memory system is
a)2 b)4 c)8 d)16 Ans.
34. In time division multiplexing
a) Time is doubled between bits of a byte b) Time slicing at CPU level takes place C) Total time available in the channel is divided between several users and each users is allotted a time slice. d) Noneoftheabove Ans.
35. When a program is being executed in an 8085 microprocessor, its
Program Counter contains
a) The number of instructions in the current program that have already been executed

b) The total number of instructions in the program being executed c) The memory address of the instruction that is being currently executed d) The memory address of the instruction that is to be executed next Ans.
36. The sum S of A and B in a half Adder can be implemented by using K
NAND gates. The value of K is
a) 3 b) 4 c) 5 d) None of these Ans.
37. VSWR of a transmission line is always
a) Less than unity b) Greater than unity c) Zero d) infinity Ans. 38. Wave guide acts like a
a) High pass filter b) Low pass filter C)All pass filter d) Band reject filter Ans.
39. The wave length of a 100 MHz electromagnetic wave propagating
through a perfect non magnetic dielectric with relative permittivity Ɛr =
9 is
a) 3 mtrs b) 3 cms c) 100 cms d) 10 cms Ans.

40. TEM mode exists in
a) A circular wave guide b) A rectangular wave guide c) A co-axial cable d) None of the transmission lines Ans.
41. The signal received from a circularly polarized signal by an antenna
with linear polarization compared to the signal received by same
circularly polarized antenna will be
a) Maximum b) Zero c) 3 dB less d) 3 dB more Ans. 42. When the antenna diameter is doubled, the gain of the antenna
a) Reduces by half b) Increases by 3 dB c) Reduces by 3 dB d) Increases by 6 dB Ans.
43. Intrinsic impedance of free space is given as
a) 75 Ω b) 73 Ω c) 377 Ω d) 300 Ω Ans.
44. Mark the incorrect relation
a)D=ƐE b)B = μH c)J = σE d)B=μD

Ans.
45. If the PRF is 1200 and the pulse width is 1.5 μs, the duty cycle will be
a) 12.5 percent b) 8 percent c) 0.18 percent d) 0.12 percent Ans.
46. When VSWR is 3, reflection coefficient is:
a) ½ b)1 c)0 d) ¼ Ans.
47. Which transmission line is ideal for handling high power?
a) Coaxial line b) Microstrip C) Strip line d) Rectangular waveguide Ans. 49. Capture effect is a characteristic of
a) AM system b) FM system c) PCM system d) TDM system Ans. 50. In a band limited channel higher bit rate can be transmitted with
a) BPSK b) QPSK c) FM d) FSK Ans.

51. In a transmission line terminated with a load equal to the
characteristic impedance, the reflection coefficient is
a) Zero b) +1 c)-1 d) Infinity Ans.
52. Poynting vector P = E x H has the unit
a) Watts/metre2 b) Watts/metre c) Watts-metre d) Watts-metre2 Ans.
53. If 1 watt of RF power is fed to a directional coupler having 30dB
coupling, the power available at the coupled port is a)130w b)110w c) 1 100w d) 1 1000w Ans. 54. The following demodulator scheme requires least
a)BPSK b)FSK c)ASK d)QAM Ans.
55. The channel capacity under the Gaussian noise environment for a
discrete memoryless channel with a bandwidth of 4 MHz and SNR of 31
is
a) 20 Mbps b) 4 Mbps c) 8 Kbps d) 4 kbps

Ans.
56. Satellite channel can be attributed
a) Only bandwidth limited b) Only power limited c) Both bandwidth & power limited d) None of the above Ans.
58. The region of the z plane for which −+
= 1(Re a ≠ 0) is
a) x-axis b) y-axis c) The straight linez=⎹a⎸ d) None of the above Ans.
60. The value of the determinant +++ is
a) 0 b) 1 c) (a + b + c) d) 3 Ans. 64. Equation of a straight line passing through the point (-1, 2) and
making equal intercepts on the axes is
a) x—y = 1 b)x—2y = 1 c)x+y= 1 d)x—y=2 Ans.

66.TheAlgebraicmultiplicityofthematrixA=[0 1 0 0 0 1 1 −3 3]is
a)1 b)2 c)3 d)4 Ans. 67. The impedance of an inductive reactance varies
a) Linearly with frequency b) Parabolically with frequency c) Exponentially with frequency d) Linearly with frequency in an increasing manner Ans.
68. Two resistance R1 and R2 give combined resistance of 4.5 ohms when
in series and 1 ohm when in parallel. The resistances are
a) 3 ohms and 6 ohms b) 3 ohms and 9 ohms C) 1.5 ohms and 3 ohms d) 1.5 ohms and 0.5 ohms Ans.
69. Which of the following bulbs will have the least resistance?
a) 220V, 60W b) 220V, 100W c) 115V, 60W d) 115 V, 100W Ans.

70. A resistance of 5 ohms is further drawn so that its length becomes
double. Its resistance will now be –
a) 5 ohms b) 7.5 ohms c) 10 ohms d) 20 ohms Ans.
71. The power rating of a 470 ohm resistor carrying a current of 4OmA
should be
a)¼W b)1/2W c)2W d)1W Ans. 73. The open-circuit emf of a storage cell is 2.2 volts. The terminal
voltage measured when the current is 12A is found to be 1.98 volts. The
internal resistance of the cell is
a) 0.00183 ohm b) 0.0183 ohm c) 0.183 ohm d) 1.83 ohm Ans.
74. A capacitor passes a current of 12.6 mA when supplied with 20 V ac
with a frequency of 1 kHz. The capacitance of the capacitor is
a)0.1μF b) 0.1pF c) 1μF d)1F Ans.
75. The system response can be tested better with

a) Sinusoidal input signal b) Unit impulse input signal c) Ramp input signal d) Exponentially decaying signal Ans.
76. In an ideal op-amp the output impedance is
a) 50 ohm b) 100 ohm c) Infinite d) Zero Ans. 77. What will be dB gain for an increase of power level from 13 to 26W
a)1 b)2 c)8 d)3 Ans.
78. The oscillator with the best frequency stability and accuracy is
a) Hartley oscillator b) Colpitts Oscillator C) Tickler feedback oscillator d) Crystal controlled oscillator Ans.
79. The desirable properties of transformer core material are
a) Low permeability and low hysteresis loss b) High permeability and high hysteresis loss c) High permeability and low hysteresis loss d) Low permeability and high hysteresis loss Ans.

80. The quality factor of series R-L-C circuit will increase if
a) R decreases. b) R increases. C) Voltage