Electrical Engineering (EE)

The impurity commonly used for realizing the base region of a silicon n-p-n transistor is

There may be a zero sequence components in
1. line voltage of star circuit
2. phase voltage of star circuit
3. line current of delta circuit
4. phase current of delta circuit
Select the correct answer from the given options:

Two -insulator discs of identical capacitance value C makes up a string for a 22 kV, 50 Hz,single-phase overhead line insulation system. If the pin to earth capacitance is also C, then the string efficiency is

What is the preferred type of CB to be installed in extra high voltage ac system?

The load duration curve for a power station is as shown in the given figure. The reserve capacity in the plant at 70% capacity factor is

Which of the following circuit component opposes the change in the circuit voltage–
 

Cauer and Foster forms of realizations are used only for

The Hartley-Shannon theorem sets a limit on the

PVC cables are usually used for

Which property of delta function indicates the equality between the area under the product of function with shifted impulse and the value of function located at unit impulse instant ?

Q-factor of a series R-L-C circuit possessing resonant frequency of 10Hz and bandwidth of 5Hz is

Which of the following results in a symmetrical fault ?

For successful parallel operation of two singlephase transformers, the most essential condition is that their

Question 6 to 10 carry Two Marks each

Q.

In an NGO, t he daily average wages of 20 illiterate employee is decreased from Rs. 25 to Rs. 10. T hus the
average salary of all the literate (educated) and illiterate employees is decreased by Rs. 10 perday. T he
number of educated employees working in the NGO is

How many relays are used to detect inter phase fault of a three line system ?

When a line-to-ground fault occurs, the current in the faulted phase is 100 A. The zero-sequence current in this case will be :

For a unity negative feedback control system, the open loop transfer function is

The root-locus plot of the system is

The octal equivalent of decimal 98 is

Unlimited number of ICs 7490, 78492 and 7493 are available. Which of these could be used to build the dividse-by-60 circuit of figure

An 8085 microprocessor based system uses a 4 k x 8 bit RAM whose address in AAOOH. The address of the last byte in this RAM is

Temperature measuring instruments are standardised mostly with __________ points of pure substances.

"What is the inverse lap lace transform of 

 Speed power product is measured as the product of

When the supply frequency of a three phase induction motor is increased, then its synchronous speed is

In a purely resistive circuit, the average power is ____ the peak power P_max

Consider the following statements:
1. A decoder with a data input is called a demultiplexer.
2. An octal decoder with active-LOW outputs will output seven LOWs and one HIGH for each combination of inputs.
3. A hexadecimal decoder is sometimes called a 4-line-to-10-line decoder.
4. The Gray code is not a BCD-type code.
Which of the statements given above are not correct?

Q. No. 1 – 5 Carry One Mark Each

Choose the most appropriate phrase from the options given below to complete the following sentence.

India is a post-colonial country because

The purpose of providing an iron core in a transformer is to

In arc welding, the voltage on ac supply system is in the range

Distance near the skip distance should be used for sky-wave propagation

If the number of conductors and speed of a lap wound generator is doubled then the generated emf will be

The limiting errors of measurement of power consumed by and the voltage error resistanceare + 2% and + 3.5% respectively. The limiting error of measurement of resistance will be

Power factor of an alternator driven by constant prime mover input can be changed by changing its

IF V_CC = 15 V, V_CEQ = 5 V and I_CQ = 50 mA, the efficiency in class A operation is

A set of independent current measurements taken by four observers was recorded as : 117.02 mA, 117.11 mA, 117.08 mA and 117.03 mA. What is the range of error ?

If the gain of the open loop system is doubled, the gain margin of the system is

The maximum short circuit current occurs in case of

In case of HVDC system, there is

If Pc & Psc represent core & full-load ohmic losses respectively, the maximum KVAdelivered to load corresponding to maximum efficiency is equal to rated KVA multiplied by

consider the following statements :
1. The effect of feedback is to reduce the system error
2. Feedback increases the gain of the system in one frequency range but decreases in another.
3. Feedback can cause a system that is originally stable to become unstable
Which of these statements are correct ?
 

Saving in power in DSB-SC system modulated at 80% is (in comparison with AM)

The power development programmes that are possible in Tamil Nadu are largely based on

A microprocessor with a 16-bit address bus is used in a linear memory selection configuration (i.e., Address bus lines are directly used as chip selects of memory chips) with 4 memory chips. The maximum addressable memory space is

In 8085 microprocessor, if interrupt service requests have been received from all of the following interrupts, then which one will be serviced first?

Equalising pulses in TV are sent during

In a PLL

The number of discs in a string of insulators for 400 kV ac overhead transmission line lies in the range of

 

 

If two induction motors A and B are identical except that the airgap of motor 'A' is 50% greater than that of motor 'B' then

In an armature, if m is the number of slots per pole per phase and γ is the slot pitch angle, then the breadth or the distribution factor for the armature winding is

The data sheet for a certain JFET (Junction Field Effect Transistor) indicates that I_DSS (drain to source current with gate shorted) = 15 mA and V_GS (off) (Cut – off value of gate to source voltage) = – 5V.

Match List-I (Power Semiconductor Devices) with List-ll (Characteristics) and select the correct answer using the codes given below the lists:
List-I
A. Power BJT
B. Power MOSFET
C. IGBT
D. Schottky diode

List-ll
1. Exponential l-V characteristics
2. Suitable for high frequency inverters and choppers
3. Square law l-V characteristics
4. Offers ease of control and high current density

The rate of change of digital signals between High and Low level is

The z-transform of F(z) of the function f(nT) = a^nT is

A good voltage regulation of a transformer means

Which of the following bus is used to transfer data from main memory to peripheral device?

A PIN diode is

The circuit shown below is functionally equivalent to

Squired cage bars place in the rotor pole faces of an alternator help reducing hunting

Galloping in transmission line conductors arises generally due to

In the buck-boost converter, what is the maximum value of the switch utilization - factor?