Electrical Engineering (EE)

Output rating of
1. dc generators is in kVA.
2. ac motor is in kW.
3. ac generator is in kVA.
4. dc motors is in kW.
5. induction motors is in h.p.
6. synchronous motors is in kVA.
From these, the correct statements are:

In a class C operation V_CC = 40 V, R_L = 50 Ω. The maximum load power can be

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

With regard to the filtering property, the lead compensator and the lag compensator are, respectively.

The circuit shown below is functionally equivalent to

Buses for load flow studies are classified as (i)the load bus, (ii) the generator bus and (iii) the
slack bus The correct combination of the pair of quantities specified having their usual meaning for different buses is

Which one of the following identity is correct one?

It is easy to break the covalent bond by thermal energy in case of –

A pure capacitance connected across 50Hz, 230V supply consumes 0.04W. This consumption is attributed to

 A wire 2.5m long is bent into a square. A current of 100 A flowing through the wire will producea magnetising force at the centre of the square,equal to

 

 

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

A 100 km long transmission line is loaded at 110 kV. If the loss of line is 15 MW and theload is 150 MVA, the resistance of the line is

The open loop poles of a third order unity feedback system are at 0,-1,-2. Let the frequency corresponding to the point where the root locus of the system transits to unstable region be K. Now suppose we introduce a zero in the open loop transfer function at -3, while keeping all the earlier open loop poles intact. Which one of the following is TRUE about the point where the root locus of the modified system transits to unstable region?

Base load power plants are

P: wind farms.

Q: run-of-river plants.

R: nuclear power plants.

S: diesel power plants

A Buchholz relay can be installed on

A sinusoidal waveform can be converted to a square waveform by

Eddy current damping is not used on type instruments because

In connection with arc the extinction in circuit breaker, resistance switching is employed where in a resistance is placed in parallel with the poles of the circuit breaker as shown in the figure. This process introduces damping in the LC circuit. For critical damping, the value of 'R' should be equal to

(Q.8 –Q.10) Consider the amplifier circuit shown below. The transistor is specified to have V_t = 0.4 V, k_n = 0.4 mA/V2, W/L = 10 and λ = 0. Also, let V_DD = 1.8V, R_D = 17.5kΩ, V_GS = 0.6V and v_gs = 0V.

Q. Find I_D.

A Wien-bridge is used to measure the frequency of the input signal. However, the input signal has 10% third harmonic distortion. Specifically the signal is 2 sin 400 πt + 0.2 sin 1200 πt (with t insec). With this input the balance will

A supply voltage of 230V, 50 Hz is fed to a residential welding. Write down its equation for instantaneous value

What is the steady state error for a unity feedback control system having  due to unit ramp input ?

A voltage 1000 sin ωt Volts is applied across YZ. Assuming ideal diodes, the voltage measured across WX in Volts is

Which of the following statements is not true of a phasor?

The stator of the synchros is made of

Short-circuit test is performed on a transformer with a certain impressed voltage at rated frequency. If the short-circuit test is now performed with the same magnitude of impressed voltage but at a frequency higher than the rated frequency, then

In the potentiometer circuit shown in the given figure, the value of unknown voltage ‘E’ under balanced condition will be

Consider the following digital circuits:

Speed torque characteristic of a repulsion induction motor is similar to that of a D.C.

In a negative edge triggered J-K flip-flop, in order to have the output Q state 0, 0 and1 in the next three successive clock pulses, the J-K input states required would be respectively

In a power house, illumination should be approximately ............

Cables for 220 KV lines are invariably

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:

The small value to drain to source voltage, JFET behaves like a

The first and the last critical frequency of an RC driving point impedance function must respectively by

A solid copper sphere, 10 cm in diameter is deprived of 10²⁰ electrons by a charging scheme. The charge on the sphere is

The Voltage Source Inverter (VSI) shown in the figure below is switched to provide a 50Hz, square wave ac output voltage v_o across an RL load. Reference polarity of v_o and reference direction of the output current i_o are indicated in the figure. It is given that R = 3 ohms, L = 9.55mH.

Appropriate transition i.e., Zero Voltage Switching (ZVS) / Zero Current Switching (ZCS) of the IGBTs during turn-on / turn-off is

The dual of a loop is –

In the CMOS inverter

For an existing ac transmission line, the string efficiency is 80%. If dc voltage is supplied for the same set up, the string efficiency will be

Hysteresis loss in a dc machine are proportional to

Wattless current is possible, only in

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

The Hartley-Shannon theorem sets a limit on the

The percent bias for a generator protection lies between

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

Holes are filled on the opposite side of the disc of an induction type energy meter to

A ferrite is

Under no load conditions, which of the following loss is negligible ?

The impulse response of a continuous time system is given by h(t)=  δ(t-1) + δ (t-3).  The value of the step response at t = 2 is

Galloping in transmission line conductors arises generally due to

The breakdown voltage of a cable depends upon

A transmission line of length 600km, has a phase shift in degree of

A transmission line of length 300 km operating at 50Hz, the receiving end voltage under no load V_S = 1pu is

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?

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

A directional coupler with three or more holes is sometimes used in preference to the two-hole coupler

A modulated signal is given by,

s(t) = m₁(t) cos (2 π f_ct) + m₂(t) sin (2 π f_ct)

where the baseband signal m₁(t) and m₂(t) have bandwidths of 10 kHz and 15 kHz respectively. The bandwidth of the modulated signal, in kHz, is

The corona loss or the critical disruptive voltage in a transmission line at a temperature (f) and pressure (b) can be foundout by Using “air density correction factor (δ)” given by

The system with the open -loop transfer function    is

 

Arcing voltage will be the least in case of

How does the MOSFET differ from the JFET?

Least expensive instrument for dc measurement is

Consider the circuit as shown below

The Q factor of the inductor is equal to

Consider the following statement: Distance relays used for protection of transmission line might operate undesirable due to
1. magnetizing-current in rush
2. Power swings
3. Series compensating capacitors
4. Switching over voltage
Of these statements

The full-load copper loss and iron loss of a transformer are 6,400 W and 500 W,respectively. The above copper loss and iron loss at half load will be :

A single – Phase, 200 V alternator has armature resistance and reactance of 0.8W and 4.94W respectively. The voltage regulation of the alternator at 100 A load at 0.8 leading power factor is