29-04-2017, 04:49 PM
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193/2014
Maximum : 100 marks
Time : 1 hour and 15 minutes
1.In series RLC circuit at resonance :
(A)V is in phasewith I
(B)T is maximum
(C )Inductive reactance = Capacitive reactance
(D)All the above
2.The superposition theorem is essentially based on the concept of:
(A)Duality
(B)Linearity
(C )Reciprocity
(D)Non-linearity
3.The voltage drop across a resistor of 100 Ω is 10 volts. The wattage of the resistor must be :
(A)2 W
(B)1 W
(C ) 0.5 W
(D) 0.25 W
4.For a symmetric lattice network the value of parameters is 3 Ω and that of diagonal impedance is 5 Ω. Then the Z parameters of the network are given below :
(A)z:l =z22= a(
(B)
(C )Z11= Z22 = 4 Ω
(D) N n
5,The following relation expressevS Ohms law at a point:
(A) II
(B)V - J = - — 3/
(C )
(D)V2V’ = --£ K
6.Maxwell’sdivergence equation for the magnetic field isgiven by :
(A)VxB = 0
(B)V-B = 0
(C )VxB = p
(D).V.B = p
7.Unit of magnetic flux is :
(A)Ampere turns
(B)Tesla
(C )Coulomb
(D)Weber
8.If E is the field between the plates of a parallel plate capacitor, the electrostatic energy per unit volume is :
(A) e^E
(B)£,sE2
(C )(1/2)i„E'‘
(D)c„l‘2E‘
9. The condition for an electric field E to be a static electric field is : (A) |£-rfi = 0
(B)
(C )Vx£=0
(D) . None of these
10. Which of the following system is non-linear?
(A) y(1) - x(1 - 1) - 2x(t - 2) + x(t - 3)
(B)y(1)=4x(1)
(C ) y(1) - x(1 -1) - 2x(l - x) - x(t - 3)
(D) y(1)= x(1) + 2.5
11.The system y(t) = e x(1) :
(A) stable, causal
(B) non causal, stable
(C ) unstable, causal
(D) unstable, non-causal
12.The system y(x + 3) + y(x + 2) = x(x -s 4) is :
(A) causal and memory less (C ) is causal
(B) causal and has memory' (D) is non-causal
13.If x(1) is odd, then Fourier series coefficients must be ;
(A)real and odd
(B)real and oven
(C )imaginary andeven
(D)imaginary and odd
14.The trigonometric Fourier series of an even function of time does not have the :
(A)Cosine terms
(B)Sine terms
(C )Both cosine and sine terms
(D)DC term
15. The Z transform of the sequence x(n) = u(n) where u(n) = l for
= 0 for n<0 is:
(A) l/(z-l)
(B)z/(z-1)2
(C ) zl(z-\)
(D)(z-\)/z
16.Kelvins double bridge is used for the measurement of:
(A)Low capacitance
(B) High inductance
(C ) High resistance
(D) Low resistance
17.Megger is basically a :
(A)Moving iron instrument .
(B) Moving coil instrument
(C ) Hot wire instrument
(D). Electrolytic type instrument
18.A quadrant electrometer measures :
(A)Charge
(B) Capacitance
(C ) Inductance
(D) Current
19.A circuit has impedance of (3 + jA). If a voltage (100 + j50) is applied, power in the circuit will be across the 3 Ω resistance in the mesh shown below is :
(A)100 W
(B)250 W
(C )500 W
(D) 660 W
20.TOD meter is used to record :
(A) Energy, time and demand (C ) Power, demand and time
(B) Energy, power and demand (D) None of the above
21.In an induction machine, if the air gap is increased :
(A) Efficiency will be improved
(B) Speed will reduce
(C ) Power factor will be lowered
(D) Brake down torque will be reduced
22.The all-day efficiency of a transformer depends on :
(A) its copper loss
(B) amount of load
(C ) the duration of load
(D) both (B) and (C ) are correct
23.A transformer has negative voltage regulation when its power factor is :
(A)Zero
(B)Unity
(C ) Leading‘
(D) Lagging
24.Instrument transformers are used in alternating current circuits for extending the range of:
(A)Ammeters
(B)Voltmeters
(C )Wattmeter's
(D)All the above
25.An autotransformer has a transformation ratio of 0.7, supplies a load of 2 KW. The power transferred conducrively from primary to secondary is :
(A)O.6KW
(B)1.4 KW
(C )0.35 KW
(D) None of the above
26.The number of armature parallel paths in a triplex, lap wound, 12 pole, dc generator :
(A)12
(B)24.
(C )36
(D)6
27.The full load copper loss of a transformer is 1200 W its copper loss at 50% load would be :
(A)300 W
(B)600 W
(C )1200 W
(D)1600 W
28.A 100 KVA, 200 Hz transformer is operated at 100 Hz, its KVA rating is :
(A)200 KVA
(B)400 KVA
(C )800 KVA
(D) 2000 KVA
29.Over excited synchronous generator runs at:
(A) leading pf (C ) UPF
(B) lagging pf (D) none of the above
30.The voltage between adjacent coils in a cross over winding of a transformer should not be greater than :
(B)800-1000 V
(A)500-700 V
(C )1200-1500 V
(D) 200-400 V
31.The percentage of silicon in transformer stampings is usually limited to :
(A)0.4%
(B)1.4%
(C )4%
(D)14%
32.The permeability of a material is 0.999901, it is classified as :
(A)paramagnetic
(B)diamagnetic
(C )ferromagnetic
(D)ferrite
33.Hysteresis loss varies with frequency f as :
(A) f
(B)/'*
(C )
(D)
34.Usual values of flux density Bm for a power transformer using hot rolled silicon steel is :
(A)1.1 to 1.35 Wb/m2,
(B)1.25 to 1.45 Wb/m2
(C )1.55 Wb/m2
(D)1.6 to 1.7 Wb/m2
35.The ratio of height to width of window while designing window dimensions of a transformer can be between :
(A)1 to 2
(B)2 to 1
(C )4 to 6
(D)none of these
36.Skewing of rotor slots in an induction motor helps in :
(A)Improving heat transfer
(B)Reducing noise
(C )Suppressing undesirableharmonics
(D)All the above
37.In induction motors larger the air gap-------------noise level and------------cooling.
(A)increases — improves
(B)reduces — improves
(C )reduces — reduces
(D)none of the above
38.Alternators are usually rated in :
(A) KVA
(B)KVA and KW
(C ) KW
(D)KVA, KW and power factor
39.Due to skin effect the effective resistance------------with increase in frequency.
(A) decreases
(C )remains constant
(B) increases
(D) none
40.The surge impedance of a transmission line is given by :
(A) √(LCj
(B) √(LfC)
(C ) √(C/L)
(D) √(L + C)
41.MHO relay is usually employed in protection of:
(A)short lines only
(B) medium lines only
(C ) long lines only
(D) all the above
42.For interrupting capacitive currents which circuit breaker is used :
(A)MCCB
(B)ACB
(C )SF6
(D)VCB
43.Per unit value of any quantity is defined as :
(A)Base value in any unit to actual value in the same unit
(B)Actual value in any unit to the base value in the same unit
(C )Phase value in any unit to line value in the same unit
(D) None of the above
44.A relay which operates when the alternating current exceeds a certain preset value :
(A).Over currentrelay .
(B)Reverse power relay
(C )Polarized relay
(D)Under voltage relay
45. A 10 MVA generator
(A)10 MVA
(C )5 MVA
has power factor 0.866 lagging. The reactive power produced will be
(B)8 MVA
(D)1.31 MVA
46.Corona loss in HVDC transmission compared that of AC transmission is :
(A) Very high
(B) Low
(C ) Same
(D) None of these
47.Nyquist stability is used to determine :
(A) Absolute stability
(B) Relative stability
(C )Both
(D) None
48.Compared to a closed loop system an open loop system is :
(A) more stable and more accurate
(B) more stable and less accurate
(C ) less stable and more accurate
(D) less stable and less accurate
49.In a feedback amplifier, the band width :
(A)increases by the same amount as the gain decreases
(B)decreases by the same amount as the gain decreases
(C )decreases by the same amount as the gain increases
(D)remains unaffected
50.The main application of transfer function is in the study of:
(A) steady state behavior of systems
(B) steady state as well as transient behavior of the systems
(C )only transient behavior of the systems
(D)none of these
51.Given the system specification in time domain, best approach for designing is :
(A)Nyquist plot
(B) Root locus
(C )Bodes plot
(D)None of these
52.The band width of a control system can be increased by :
(A)phase lag compensator
(B)phase lead compensator
(C )phase lag-lead compensator
(D)all the above
53.The servo motor differs from other motors since it has :
(A)high inertia and high torque
(B)low inertia and low torque
(C )low inertia and high torque
(D)constructionally it is different
54.A 100 V voltmeter has an accuracy of 5% on full scale. The percentage error while measuring 50 V will be :
(A) 2.5%
(B)5%
(D)10%
(C ) 7.5%
55.Moving coil in dynamometer wattmeter is connected :
(A) in series with fixed coil
(B) across load
(C ) in series with load
(D) across supply
56.Induction wattmeter's are free from — error.
(A) phase
(B) creeping
(C ) frequency
(D) temperature
57.Hay’s bridge is particularly used for measurement of;
(A)inductance Z with large phase angle
(B)mutual inductance
(C )self inductance
(D)capacitance and dielectric loss
58.Operation of Q meter is based on :
(A) series induction
(B) mutual induction
(C ) series resonance
(D) eddy.current
59.At low power factor dynamometer type wattmeter will cause :
(A) no error
(B) high error
(C ) low error
(D) none of these
60.The observed signal in an oscilloscope should be applied :
(A) across its X plates
(B) across its Y plates
(C ) to the horizontal amplifier
(D) to the trigger circuit
61.A modern power semiconductor device IGBT combines the characteristic of:
(A) BJT and MOSFET
(B) FCT and GTO
(C ) SCR and MOSFET
(D) SCR and BJT
62.In thyristor latching current is— than holding current.
(A) Equal
(B) Less
(C ) Greater
(D) None of these
63.Voltage feedback amplifier is a— amplifier.
(A) shunt-shunt
(B) shunt - scries
(C ) series - shunt
(D) series - scries
64.Which of the following is a fastest ADC?
(A) Counter type
(B) Flash type
(C ) Successive approximation type
(D) Dual slope type
65.Which of the following is the most popular DAC?
(A) R - 2R ladder type
(B) weighted - resistor type
(C ) switched - current source type
(D) switched — capacitor type
66.The sequential circuit in which I he output depends only on the present state of flip-flops is
called a—,------------circuit.
(A) Mealy,
(B) Moore
(C )Transition
(D)None of the above
67.A----------------circuit is used to improve the rise time and fall time of pulses.
(A)Multivibrator
(B)Oscillator
(C )Monos table
(D)Schmitt trigger
68.How many inputs and outputs does a full adder have?
(A)2 inputs and 2 outputs
(B)2 inputs and 1 output
(C )3 inputs and 2 outputs
(D)2 inputs and 3 outputs
69.• For an SCR, dv/dt protection is achieved through the use of:
(A)RL in series with SCR
(B)RL across SCR
(C )L in series with SCR
(D)None of the above
70.A single phase voltage controller feeds an induction motor and a heater, which of the following statements are true?
(A)In both the loads, fundamental and harmonics are useful
(B)In induction motor only fundamental and in heater only harmonies are useful
(C )In induction motor .only fundamental and in heater fundamental as well as harmonics are useful
(D)In induction motor only harmonics and in heater only fundamental are useful none of the above
71.A motor armature supplied through phase control SCR’s receives a smoother voltage shape at:
(A) high motor speeds
(B) low motor speeds
(C ) rated speed
(D) none of these
72. A single phase full bridge voltage source inverter (VSI) has inductor as constant source voltage, the current through the inverter is :the load. For a
(A) Square wave
(B) Sine wave
(C ) Saw tooth wave
(D) Triangular wave
73.A single phase full bridge inverter can operate in load commutation mode in case load consists of:
(A) RLC over damped
(B) RLC under damped
(C ) RLC critically damped
(D) None of these
74.Hard firing of a thyristor :
(A) Reduces TORN ON time
(B) Reduces TURN OFF time
(C ) Increases TURN ON time
(D) Increases TURN OFF time
75.The maximum load that is usually connected in power sub-circuit is :
(A) 2000 W
(B) 3000 W
(C ) 1500 W
(D) 5000 W
76.The insulation resistance of HV circuit breaker is :
(A) 2KΩ
(B) 20 KΩ
(C ) 20 MO
(D) 2000 M Ω
77.The range of a dc ammeter can be increased by using :
(A) Series resistor
(B) Inductance in series
(C ) Shunt resistor
(D) Capacitance in parallel
78.Which of the following wires will have the least diameter?
(A) 1SWG
(B) 10 SWG
(C ) 20 SWG
(D) 40 SWG
79.The rated load of an underground cable is always ——----------the natural load.
(A) higher than
(B)lesser than
(C ) equal to
(D)none of these
80.While laying 11 KV cables, the minimum cable):
(A) 2 D
(B)4 D
(C ) 6 D
(D)12 D
81.Identify the present Governor of Kerala :
(A) Sheela Kaul
(B)Nikhil Kumar
(C ) Sheela Dheeshith
(D) H.R. Bhradwaj
bending radius has to be (If I) = diameter of the
jV
82.Name the Kerala reformer who was famous for Villu Vandi Yathra:
(A) K. Kelappan
(B) Ayyankali
(C ) Sree Narayana Guru
(D) Mannathu Padmanabhan
83.'The poem 'Udyanavirunnu was penned by :
(A) Bhavabhuti
(B) Kumaranasan
(C ) Kumar a Guru
(D) Pandit Karuppan
84.Srinagar is situated on the bank of the river :
(A) Indus (C ) Ravi
(B) Jhelum (D) Godavari
85.‘Green Revolution’ has been very successful in which of the following crops?
(A) Sugarcane
(B) Wheat
(C ) Rice
(D) Barley
86.Bhagat Singh, Raja Guru, Sukhdev were hanged for their role in :
(A) Meerat conspiracy
(B) Civil disobedience strike
(C ) Kaker Case
(D) Lahore Conspiracy
87.The person who led ’Ezhava memorial’ of 1896:
(A) Sree Narayana Guru
(B) Kumaranasan
(C ) Dr. Palpu
(D) T.K. Madhavan
88.In which year was the human population census last conducted in India?
(A) 2001
(B) 2008
(C ) 2011
(D)2013
89.Who was the founder of ‘Vavoottu Yogam’?
(A) Sahodaran Ayyappan
(B) Vagbhatananda
(C ) Sree Narayana Guru
(D) Ayya Vaikundar
90.Which type of clouds are popularly called ‘rain clouds’?
(A) Cumulonimbus
(B) Nimbostratus
(C ) Cirrus
(D) Altocumulus
91.Who founded Prathyaksha Raksha Daiva Sabha’ (PRDS)?
(A) Blessed Kuriakose Elias Chavara
(B) William Logan
(C ) Poikayil Yohannan
(D) St. Thomas Acquinas
92.Sardar Sarovar project is to be constructed on the river :
(A)Krishna
(B)Tapti
(C )Brahmaputra
(D)Narmada
93.The 2016 edition of Olympic Games will be held in which country?
(A)Russia
(B)Pakistan
(C )Brazil
(D)Indonesia
94.The prestigious Gandhi Peace Prize — 2013 has been conferred to :
(A)Chandi Prasad Bhatt
(B)Medhapadkar
(C )Prabhat Padnaik
(D)Sugatha Kumari
95.Who was the founder of 'Ananda Maha Sabha?
(A) Ayya Vaikundar
(B) Brahmananda Swami Sivyogi
(C )Swami Vivekananda
(D)Karunakara Guru
96.Which of the following states of India has longest coast line?
(A) Kerala
(B) Tamilnadu
(C ) Gujarath
(D) Sikkim
97.The unique identification number has been associated with:
(A) Aaswas
(B) Sweekar
(C ) Uphar
(D) Aadhaar
98.Vayalar Award 2013 was given to:
(A)Prabha Varma
(B)Perumpadavam sreedharan
(C )Navamanjari
(D)Vivekodayam
99.Name the journal published by Vagbhatananda :
(A)Abinava Keralam
(B)Perumpadavam Sreedharan
(C )Navamanjari
(D) Sara Joseph
100. Which of the following programme aims to bring the deprived sections of society with in the banking network through opening account?
(A) Suvidha
(B) Saksharbharat
(C ) Swabhimaan
(D) Swasraya