Transmission Corporation of Andhra Pradesh previous year question papers

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[Kiran Chandar]

As you want to get the Transmission Corporation of Andhra Pradesh previous year question papers so here it is for you:

1. Electronic control systems have the serious draw-backs of
(a) low reliability (b) operational difficulty (c) temperature sensitiveness (d) all of above

2. The system whose characteristic equation has the following roots is marginally stable
(a) -j, j, -1,1 (b) -3,-2,0 (c) -2+3j, -2-3j, -2 (d) -3,-2,-1

3. A phase log compensation will
(a) improve relative stability
(b)increase the speed of response
(c)increase band-width
(d) increase overshoot

4. For Nyquist plot we use
a. open loop function
b. closed loop function
c. characteristic equation
d. any of the above

• A system with gain margin close to unity or a phase margin close to zero is
a. highly stable
b. oscillatory
c. relatively stable
d. none of these

• Root locus diagram exhibits the
a. frequency response of a system
b. poles of the transfer function for a set of parameter values
c. bandwidth of system
d. all of the above

• Increase in the gain K makes the system
a. more stable
b. unstable
c. none of above

• The transfer function of a system is used to determine
a. the output for a given input
b. the type of system
c. the input for a given output
d. the steady state gain

• In a servo system the voltage induced in the control transformer rotor is the
a. error voltage
b. driving voltage
c. opposing voltage
d. none of these

• With the feedback system, the transient response
a. decays slowly
b. decays rapidly
c. rises slowly
d. rises quickly

** Kirchoff’s nodal equations based on the principle of
** If the Supply voltage is increased by n times, the cross section of conducter will [increase/decrease] by ________ times ?
** Memory word size of 8085 microprocessor?
** Flip flop used in shift register
** And gate
** Static electricity is formed for?
** Cc has current gain and input impedance ?
** If geta=1, the roots of cequ are
** For a 6db attenuator , if input power is 100MW ,o/p power will be =?
** For a perfectly matched tx line , reflection coefficient=?
** Radiation pattern of isotropic radiator is
** Amplitude limiter essentially a
** Waveguide acts as
** The Frequency is measured by _________ bridge ?
** x-band rangeis
** reflection coefficient is zero , then the line is
** Dynamic memory cells are constructed using
** Which of the following is most efficient
** Which of the following has higher bandwidth
** Essential channel capacity is a measure of
** Lossless line condition is?
** The Source internal resitanse Rs , When equal to Load resistance RL, the maximum transfered is of _____ % of input power?
** Typical bit rate of keyboard devices ?
** 16 in octal s/m is?
** No of bits represents 16 is
** F(t)=t e at, F(S)=?
** F(S)=1/(s+a)2, f(t) =?
** 16 bit width ,8085 mapps ans 64kilobytes
** Which of the following flipflop doesn’t have race problem?
** Dominant mode TE10
** Wave length in waveguide equal to ,greater than , lessthan ,independent of free space wave length
** Half adder has how many ips and ops
** Magnetron is
** Bethe-hole coupler uses
** Power gain=40 : Voltage gain=200 : Current gain=?
** Tfunction=k(s+1)/s(s-2+j3)(s-2-j3), no of poles=?
** Tfuncion 1-s/1+s , it is known as
** G=k/s2(1+sT)then order and type=?
** Which of the following component is passive and reciprocal
** Broad side array interelement phase shift is
** R=100ohms,C=100pf, TIME CONST=?
** Isotropic antenna gain is
** In one timeconstant the final value increases by _____________value
** ABCD PARAMETERS of ELECTRICAL SYMMETRY: Ad-bc=1
** s-equation of L DI/DT
** In a CE amplifier ,if a C.E voltage increase
** Transfer function has 2poles on L.HS PLANE and 2zeros on r h s plane this results
** The gain at corner frequency is?
** t.v s/m am- picture,fm-sound
** code used in teleprinter
** Bandwidth =resonant frequency/qualityfactor
** Differentiation of u(t)?
** Freespace impedance?
** Resonant frequency of rlc ckt is ?
** bandwidth of telephoneis
** bit is a unit of
** when 2 n/w are connected in parallel
a. z-parameter add
b. h-paramete
c. y-parameter
d. abcd parameter
** beamwidth of antenna is
** Convolution of two u(t)?
** T function H(s)=1/(s+1),h(f)=?
** F(s)=1/s2, then f(t)?
** Fourier series expansion of a even periodic function contains ?
** If ip of ckt is sine , the steady state op willbe exponentially decay with time const,sin , damped sinusoidal
** Power gain of emitter follower?
** Highest voltage gain can be obtained from
** Differentiation of time domain is equal to
** Standard rect waveguide width to height ratio
** Which is micro wave oscillator
** If transmission line open ckt then vswr?
** Is Pn junction reversebiased ?
** Typical q factor of crystal oscillator
** In pnp transistor saturation current is due to
** When both junction of a transistor is forward biased then it is said to be in
** 50ohms line matched to 200 ohms load through quarter wavelength transmission , the characteristic impedance of matched line should be
** Hall effect used to measure?
** P type semiconductor properties?

1. Which of the following types of instrument is an integrating instrument?

1. power factor meter
2. energy meter
3. wattmeter
4. frequent meter

• Which of the material is used for the ’swamping’ resistance that is connected in series with the working coil of a voltmeter?

1. Constantan
2. Manganin
3. Eureka
4. Nichrome

• What are used to increase the range of ammeters.

1. Multipliers
2. Shunts
3. Control Springs
4. Potential transformers

• Which voltmeter do you select for measuring 50KV DC?

1. Moving Coil Voltmeter
2. Hot wire voltmeter
3. Electro Dynamo meter
4. Electrostatic Voltmeter

• Which of the following you will prefer to extend the range of an ac voltmeter?

1. Low series resistance
2. high resistance in parallel
3. CT
4. PT

• High AC voltages are usually measured with

1. magnetic voltmeter
2. inductive voltmeter
3. potential transformers with voltmeters
4. current transformers and voltmeters

• Creeping is the phenomena occurs in

1. voltmeter
2. wattmeter
3. energy meter
4. ammeter

1. The ratio of voltage and electric current in a closed circuit
(a) remains constant (b) varies (c) increases (d) falls

2. The resistance of a wire varies inversely as
(a) area of cross section (b) length (c) resistivity (d) temperature

3. The electrical conductivity of metals is typically of the order of ( in ohm-1 m-1)

4. (a) 10 to the power of 7 (b) 10 to the power of 5 (c) 10 to the power of -4 (d) 10 to the power of -6

5. Four resistors, each of resistance R ohms are available. The minimum resistance of the combination will be
(a) 4R (b) R (c) R/4 (d) R/8

6. The elements which are not capable of delivering energy by its own are known as
(a) unilateral elements (b) non-linear elements (c) passive elements (d) active elements

7. The magentic susceptibility of paramagnetic material is
(a) less than zero (b) less than one but positive (c) greater than one (d) equal to zero

8. The Direction of current in an ac circuit
(a) is from positive to negative (b) is always in one direction (c) varies from instant to instant (d)Cannot be determined

9. which of the following statements associated with purely resistive circuits is correct?
(a) PF is unity (b) Power consumed is zero (c) Heat produced is zero (d) PF is zero

10. The magnetic field energy in an inductor changes from maximum value to minimum value in in 5m sec when connected to an ac source. The frequency of the source is
(a) 20 Hz (b) 50 Hz (c) 200 Hz (d) 500 Hz