A synchronous generator is rated at 10MVA, 11kV, 0.85 p.f., 50Hz. What is the significance of 0.85 p.f.?

A)Load of p.f. more than 0.85 cannot be met
B)The prime-mover power rating is 8.5 MW 
C)It does not have any significance
D)Load of p.f. less than 0.85 cannot be met

Which one of the following equipment can open or close electrical circuits under both normal and abnormal conditions?

A)Fuse
B)Relay 
C)Circuit Breaker 
D)Isolator

A unity feed back closed loop system has open loop transfer function G(s)=K/{s(s^2+8s+25)}. At some value of K the system becomes oscillatory. What will be the values of K and frequency of oscillation?

A)150, 5 rad/sec 
B)200, 10 rad/sec 
C)200, 5 rad/sec 
D)150, 10 rad/sec

If the effect of earth is taken into account, then the capacitance of line to ground

A)Remains unaltered 
B)Increases 
C)Decreases
D)Becomes infinite

If P1 and P2 be the iron and copper losses of a transformer on full-load, then the ratio of P1 and P2, such that maximum efficiency occurs at 25% of the full-load, will be

A)1/4
B)1/64
C)1/16
D)1/2

The apparent power and active or real power are equal when the power factor (pf) is

A)0.5 leading 
B)0.5 lagging
C)zero 
D)unity

The power input to a three phase induction motor is 50kW and the corresponding stator losses are 2kW. The rotor is rotating at a slip of 3%.What will be the total rotor copper loss?

A)48 kW
B)45.46 kW
C)46.56 kW
D)1.44 kW

An SCR having equivalent capacitance of the reverse biased junction as 50 picoFarad, can be fired with a dv/dt of 200V/microsec. What will be the value of capacitive current flowing through the junction?

A)5 mA
B)1 mA 
C)20 mA 
D)10 mA

What is the effect of an integral controller on the type and order of the system?

A)Increases the type by one and increases the order by one
B)Decreases the type by one and increases the order by one
C)Decreases the type by one and decreases the order by one
D)Increases the type by one and decreases the order by one

The fault which occurs rarely in practice and is the most severe and imposes more heavy duty on the circuit breaker is

A)Line to line fault
B)Single line to ground fault 
C)Symmetrical fault 
D)Double line to ground fault

The temperature independent polarization is

A)Orientation polarization 
B)Space discharge polarization
C)Electronic polarization
D)Space charge polarization

What should be the address bus width to address 4kB memory?

A)4
B)12
C)16
D)8

If the gain of a transfer function is increased then the

A)Phase crossover frequency is decreased 
B)Gain crossover frequency is decreased 
C)Phase crossover frequency is increased 
D)Gain crossover frequency is increased

A negative feedback of β=0.002 is applied to an amplifier of gain 1000, then the percentage change in overall gain of the feedback amplifier if the internal amplifier is subjected to a gain reduction of 15% will be approximately

A)7.6% 
B)2.6%
C)5.6% 
D)9.6%

The insulators used in guy cables are

A)Stay insulators
B)Shackle insulators
C)Disc insulators
D)Pin insulators

If I(s)=(s^2+8s+8)/(s^2+4s), what will be the steady state component of i(t)?

A)1
B)2
C)4
D)8

A derivative controller

A)Improves transient stability
B)Improves steady state stability
C)Improves both the steady state and transient stability
D)Does not affect system stability 

Under force-voltage analogy, viscous friction co-efficient is analogous to

A)Reciprocal of inductance 
B)Charge 
C)Resistance
D)Reciprocal of capacitance

AC series motors are built with as few field turns as possible to reduce

A)Flux
B)Eddy current losses
C)Field reactance 
D)Speed

The displaced atom in Frenkel’s defect is called as

A)Anion 
B)Cation 
C)Hole
D)Real atom

The armature reaction of a synchronous generator under short-circuit condition is

A)Both demagnetising and cross-magnetising
B)Magnetising 
C)Cross-magnetising
D)Demagnetising

A vibration galvanometer is tuned

A)by changing its damping constant
B)by attaching weight to the vibrating coil 
C)by changing length and tension of vibrating coil
D)by changing its damping factor

Thermal relays are commonly used in

A)Generator protection
B)Motor starters
C)Transformer protection 
D)Feeder protection

Which one of the following alphanumeric code is used on punched paper cards?

A)8-bit EBCDIC 
B)7-bit Selectric 
C)7-bit BCDIC
D)12-bit Hollerith

In DMA operation, data transfer takes place between

A)Different CPUs 
B)I/O and memory
C)I/O and CPU 
D)Memory and CPU

For the polynomial P(s)=s^5+s^4+2s^3+2s^2+3s+15, the number of roots which lie in the right half of the s-plane is

A)1
B)4
C)2
D)3

In a transmission line there is a flow of zero sequence current when

A)Double line to ground fault
B)Line to line fault
C)Three phase fault 
D)There is an occurrence of over voltage on line due to a charged cloud

For circulating current mode operation of dual converter

A)2nd bridge is gated after a small time interval of the 1st one is gated
B)Only one bridge is gated at a time 
C)1st bridge is turned off before the 2nd bridge is gated
D)Both the bridges are gated simultaneously 

The instruction queue in 8086 CPU is

A)Of random access type 
B)Of FIFO type
C)Of infinite queue
D)Of LIFO type

A very effective logic circuit can be realized by constructing an n-channel and a p-channel MOS transistor on the same substrate. The configuration is known as

A)Supplementary FET
B)Complementary MOSFET 
C)Supplementary MOSFET 
D)Complementary FET

Johnson noise is

A)caused by thermal agitation of free electrons carrying current 
B)shot noise which results from random emission of electrons across a p-n junction
C)noise of an electromagnetic origin that is radiated into the circuit
D)noise carried into the circuit through conductors

A thermocouple has a sensitivity of 500 μV/°C. It is employed to measure a temperature of a furnace at 700 °C with reference junction at 50 °C. The voltage output of the thermocouple is / थर्ोकपल esa 500 μV/°C

A)750 mV
B)650 mV
C)375 mV
D)325 mV

A program counter is a storage register for

A)Location of instruction in memory
B)Binary code for the operation to be performed
C)Location of data in memory
D)Address of next instruction to be executed

In a chopper circuit, the switching device is turned off at regular intervals by adopting

A)A combination of forced and natural commutation 
B)Forced commutation 
C)Either forced or natural commutation
D)Natural commutation

The positive swing of the output signal in a transistor circuit starts clipping when Q-point of the circuit moves towards the

A)Centre of the load line 
B)Centre of the supply lineS
C)Saturation point 
D)Cut-off point

If A = 5ax - 3ay + 5az and B = 3ax + ay then the magnitude of (2A - B) will be

A)18.07
B)10.07
C)22.07
D)14.07

The 8085 microprocessor responds to the presence of an interrupt

A)as soon as the TRAP pin becomes high 
B)by checking the TRAP pin for high status at the end of the execution of each instruction
C)by checking the TRAP pin for high status at regular intervals
D)by checking the TRAP pin for high status at the end of each instruction fetch

A full wave controlled rectifier with resistive load is supplied from 200 sin 100t (volts) mains. What will be the average output voltage if the SCRs are fired at 60 degree?

A)150V
B)300V
C)200V
D)95.5 V

Materials which are electrical insulators and in which an electric field can be sustained with a minimum dissipation of power can be named as

A)Magnetic materials 
B)Semi-conductors
C)Super conductors 
D)Dielectric materials