Following are the questions and answers to the Sub Engineer in Kerala State Electricity Board Limited(KSEB Ltd) examination conducted by Kerala Public Service Commission on 26-08-2015. We expect this will help the candidates who are preparing for the Sub Engineer and other Electrical Engineering exams. The purpose of this section is just to support the candidates who prepare for Kerala PSC and other competitive exams. You can always refer this website from your mobile phone on the go or from your home PC.
Sub Engineer in KSEB (Kerala State Electricity Board)
Kerala PSC Previous Year Fully Solved Question Paper 2015 | Exam held on: 26-08-2015
Questions : 81-100
81:-Superposition Theorem is essentially based on the concept of
[a] Reciprocity
[b] Linearity
[c] Duality
[d] Non linearity

82:-Form factor for DC supply voltage is always
[a] Zero
[b] Unity
[c] Infinity
[d] Any value between zero and one

83:-In purely resistive circuits
[a] Power factor is unity
[b] Power consumed is zero
[c] Heat produced is zero
[d] Power factor is zero

84:-In a series resonant circuit, the impedance below resonant frequency is
[a] Capacitive
[b] Inductive
[c] Resistive
[d] Depends on values of circuit components

85:-The figure of merit of RLC circuit will increase if
[a] R decreases
[b] R increases
[c] Voltage increases
[d] Voltage decreases

86:-In an Intrinsic Semiconductor, Fermi Level represents the energy, with probability of its occupation of
[a] 0 %
[b] 25 %
[c] 50 %
[d] 100 %

87:-An Infra Red LED is usually fabricated from
[a] Ge
[b] Si
[c] GaAs
[d] GaAsP

88:-Avalanche Photo diodes are preferred over PIN diodes in optical communication systems because of
[a] Speed of operation
[b] Higher Sensitivity
[c] Larger bandwidth
[d] Larger power handling capacity

89:-Power Transistors are invariably provided with
[a] Heat Sink
[b] Metallic casing
[c] Soldered connections
[d] Fan for heat removal

90:-In a JFET, beyond Pinch Off Voltage, as the drain voltage increases, the drain current
[a] Decreases
[b] Remains constant
[c] Increases
[d] May increase or decrease

91:-After firing an SCR, if the gate pulse is removed, the SCR current
[a] Remains the same
[b] Reduces to zero
[c] Rises up
[d] Rise a little, then falls to zero

92:-One of the characteristic of the Emitter Follower is its
[a] Low input resistance
[b] Low current gain
[c] Low voltage gain
[d] High output resistance

93:-Cross Over Distortion in class B push pull amplifier is eliminated by
[a] Class C operation
[b] Class AB operation
[c] Elimination of output transformer
[d] Reducing transistor bias

94:-A high Q tuned circuit in a tuned amplifier permits it to have high
[a] Selectivity
[b] Fidelity
[c] Sensitivity
[d] Frequency range

95:-Which of the following Op-Amp system is non linear?
[a] Current to Voltage Converter
[b] Logarithmic Amplifier
[c] Active Filter
[d] Delay Equalizer

96:-At microwave frequencies, the size of the antenna becomes
[a] Very large
[b] Large
[c] Small
[d] Very small

97:-In a single phase full converter, the number of SCRs conducting during overlap is
[a] 1
[b] 2
[c] 3
[d] 4

98:-A sinusoidal voltage of amplitude 1 kV is amplitude modulated by another sinusoidal voltage to produce 30% modulation. The amplitude of  each sideband term is
[a] 300 volts
[b] 150 volts
[c] 500 volts
[d] 250 volts

99:-An interrupt in which the external device supplies its address as well as the interrupt request is known as
[a] Vectored interrupt
[b] Maskable interrupt
[c] Non - Maskable interrupt
[d] Designated interrupt

100:-Logic 1 in negative logic system is represented by
[a] Zero level
[b] Lower voltage level
[c] Higher voltage level
[d] Negative voltage

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