The purpose of feedback transformer & diode in complementary commutated inverters is to-
In order to obtain static voltage equalization in series connected SCR’s connection arer made of-
In phase controlled rectification PF=
Why sector winding is used in synchronous motor?
A calculation of making current where MVA & KV was given.
The oop voltage e1 & e2 of 2 full-bridge inverters added using o/p transformer. In order to eliminate 5th harmonic from o/p voltage, the phase angle between e1&e2 will be-
A single phase fully controlled line commutated ac-dc converter operates as an inverter when-
An SCR has half cycle surge current rating of 3000A for 50Hz. One cycle surge current will be. (double of that)
When compared to an symmetrical thyristor, the turn off time & reverse blocking voltage of an asymmetrical thyristor will be-
A step-up chopper is feed from an 220v dc source to deliver a load voltage of 66o v. If the non conducting time is 100micro-sec then reqd pulse width will be. (get duty cycle only)
There were some 5-6 numerical problems which I could not remember totally but they consist of firing angle & power transfer of inverter, SCR. Go llok for that.
Relay current setting & Ct ratio was given you have to find out Relay Pick up Current.
One question from Dc shunt motor- like a resistance is added of 4.5 ohm in series with arm where rest of arm is 0.5 ohm. Machine is supplied 220v. find out the null current.
In aptitude part see through series completion there was a 5-6 no of that.
No aptitude questing like avg, %, proff-loss, prob, etc.
Why rotor of SCIM is skewed?
Good transformer oil contains how much amount of water in ppm?
Lightning over voltage create how much volt?
K/s(s+1)(s+5) then find out the value of K so that system become stable.
There was a question from definition of Nyquist criteria.
Standing done up to the frequency range of? (audio)
If a square waveform if given to the supply side of a 2wdg transformer its o/p waveform will be-
SC test done on transformer because....
If a transformer is operating in .8 PF lag & at efficiency of .9, if now P is .8 lead the efficiency will become.
Interpoles are connected for?
Dielectric strength of air?
A alternator is connected to a grid. Now its prime mover is go slow by ½. Change in its exiting current to held in synchronism.
Is the strength of capacitor in LPF is increased the op voltage will-
The voltage of a generator and an infinite bus are given 0.92, 10 deg & 1.0, 0 deg resp. the generator acts as a –
A wave will not experience any reflection when impedance of line is equal to- surge imp
Power transmitted is related to system voltage as-
Delay creator ckt name (multivibrator name actually)
In tachogenerator adjustment is done by-
Surge wave is attended by- (C,L,R)
there was 10 question related to measurement-
Read all electrostatic instrument related question from any competitive exam book.
Lowest reading in moving iron meter is-
In galvanometer damping is provided by-
In electrodynamic meter a battery & a resistance is provide for-
Megger is used for-
A question like an ac is applied against a moving coil meter it will reads-
Rectifier type instrument measures what value - (Rms)
Advantage of electrostatic instrument is-
Creeping occurs because-
Why 2 holes are drilled oppositely in disc of energy meter.
Energy meter is a _____ type equipment (recording)
There was a question related to selection of a voltmeter based on accuracy-
Advantage of hay bridge over anderson bridge-
Inductance is measured by – (all the 3 bridge name) .
Potentiometer is which type of instrument-
Which type of motor is used in refrigerator?
META TAGS:-C-DAC ELECTRONICS STUDY MATERIALS I C-DAC LAST 5 YEARS EXAM PAPERS I C-DAC OLD QUESTION PAPERS I C-DAC PREVIOUS YEAR QUESTION PAPERS I C-DAC SAMPLE PAPERS I C-DAC ELECTRONICS MODEL EXAM PAPERS I DOWNLOAD C-DAC ELECTRONICS STUDY MATERIALS I C-DAC OLD PAPERS I C-DAC PROJECT ENGINEERS OLD PAPERS I DOWNLOAD ELECTRICAL QUESTION PAPERS I DOWNLOAD C-DAC ELECTRONICS IMPORTANT QUESTIONS I C-DAC ELECTRICAL QUESTIONS I C-DAC ELECTRONICS MODEL QUESTIONS I C-DAC PREVIOUS YEAR SOLVED PAPERS I C-DAC EXAM SYLLABUS I C-DAC ADVERTISEMENT I
Center for Development OF Advanced Computing Objective Type Questions C-DAC Microprocessor & Micro-Controller
Q.1.If the crystal oscillator is operating at 15 MHz, the PCLK output of 8284 is
2.5 MHz.
5 MHz.
7.5 MHz.
10 MHz.
Q.2.In which T-state does the CPU sends the address to memory or I/O and the ALE signal for de-multiplexing
T1.
T2.
T3.
T4.
Q.3.If a1M1× DRAM requires 4 ms for a refresh and has 256 rows to be refreshed, no more than __________ of time must pass before another row is refreshed.
64 ms.
4 ns.
0.5 ns.
15.625
Q.4.In a DMA write operation the data is transferred
from I/O to memory.
from memory to I/O.
from memory to memory.
from I/O to I/O.
Q.5.Which type of JMP instruction assembles if the distance is 0020 h bytes
near.
far.
short.
none of the above.
Q.6.A certain SRAM has 0CS=,0WE=and1OE=. In which of the followingmodes this SRAM is operating
Read
Write
Stand by
None of the above
Q.7.Which of the following is true with respect to EE PROM?
contents can be erased byte wise only.
contents of full memory can be erased together.
contents can be erased using ultra violet rays
contents can not be erased
Q.8.Pseudo instructions are basically
false instructions.
instructions that are ignored by the microprocessor.
assembler directives.
instructions that are treated like comments.
Q.9.Number of the times the instruction sequence below will loop before coming out of loop is MOV AL, 00hA1: INC AL JNZ A1
00
01
255
256
Q.10.What will be the contents of register AL after the following has been executed MOV BL, 8C MOV AL, 7E ADD AL, BL
0A and carry flag is set
0A and carry flag is reset
6A and carry flag is set
6A and carry flag is reset
Q.11.Direction flag is used with
String instructions.
Stack instructions.
Arithmetic instructions.
Branch instructions.
Q.12.Ready pin of a microprocessor is used
to indicate that the microprocessor is ready to receive inputs.
to indicate that the microprocessor is ready to receive outputs.
to introduce wait states.
to provide direct memory access.
Q.13.These are two ways in which a microprocessor can come out of Halt state.
When hold line is a logical 1.
When interrupt occurs and the interrupt system has been enabled.
When both (A) and (B) are true.
When either (A)or (B) are true.
Q.14In the instruction FADD, F stands for
Far.
Floppy.
Floating.
File.
Q.15.SD-RAM refers to
Synchronous DRAM
Static DRAM
Semi DRAM
Second DRAM
Q.16.In case of DVD, the speed is referred in terms of n X (for example 32 X). Here, X refers to
Q.21.Signal voltage ranges for a logic high and for a logic low in RS-232C standard are
Low = 0 volt to 1.8 volt, high = 2.0 volt to 5 volt
Low =-15 volt to –3 vol, high = +3 volt to +15 volt
Low = +3 volt to +15 volt, high = -3 volt to -15 volt
Low = 2 volt to 5.0 volt, high = 0 volt to 1.8 volt
Q.22.The PCI bus is the important bus found in all the new Pentium systems because
It has plug and play characteristics
It has ability to function with a 64 bit data bus
Any Microprocessor can be interfaced to it with PCI controller or bridge
All of the above
Q.23.Which of the following statement is true?
The group of machine cycle is called a state.
A machine cycle consists of one or more instruction cycle.
An instruction cycle is made up of machine cycles a nd a machine cycle ismade up of number of states.
None of the above
Q.24.8251 is a
UART
USART
Programmable Interrupt controller
Programmable interval timer/counter
Q.25.8088 microprocessor has
16 bit data bus
4 byte pre-fetch queue
6 byte pre-fetch queue
16 bit address bus
META TAGS:-MICROPROCESSOR IMPORTANT QUESTIONS I C-DAC ELECTRONICS MODEL PAPERS I DOWNLOAD C-DAC PREVIOUS YEAR EXAM PAPERS I DOWNLOAD C-DAC MODEL PAPERS I C-DAC PRACTICE PAPERS I GATE MICROPROCESSOR QUESTIONS I MICROPROCESSOR STUDY MATERIALS I DOWNLOAD C-DAC OLD EXAM PAPERS I C-DAC MICROPROCESSOR SOLVED QUESTIONS I DOWNLOAD C-DAC SAMPLE PAPERS I C-DAC QUESTION PAPERS I ELECTRONICS MODEL PAPERS I DOWNLOAD C-DAC EXAM PAPERS I C-DAC LAST 5 YEARS EXAM PAPERS I C-DAC SAMPLE PAPERS I
