UPSC ESE Electrical Engineering Solved Papers

Which one of the following code counters is used to remove the ambiguity during the change from one state of the counter to the next during the state transition?

Which one of the following gates is most commonly used in the design of a bus system?

Consider the following characteristics of CISC architecture:

1. A large number of instructions
2. A large variety of addressing modes
3. Instructions that manipulate operands in memory
4. Fixed-length instruction formats

Which of the above characteristics are correct?

Match the following Lists related to the registers with their functions:

Select the correct answer using the code given below:

Which one of the following types of instructions is useful for initializing registers to assign a constant value?

Which one of the following is not an operation performed by call subroutine instruction?

Which of the following lines/diagrams are used when the data transfer is between an interface and an I/O device?

In which one of the following data transfer schemes, the CPU stays in a program loop until the I/O unit indicates that it is ready for data transfer while transferring data to and from peripherals?

Which one of the following methods is used to detect burst errors occurring in the communication channel?

In operating systems, which one of the following approaches is used to keep track of system activities such as the number of system calls made or the number of operations performed to a network device or disk?

The page fault occurs

Suppose that the failures of two drives are independent; that is, the failure of one is not connected to the failure of the other. Then, if the mean time between failures of a single drive is 100000 hours and the mean time to repair is 10 hours, the approximate mean time to data loss of a mirrored drive system is

Which one of the following modifiers tells the compiler that a variable's value may be changed in ways not explicitly specified by the program?

Consider the following statements regarding applications of a p-n junction diode:

1. It is used as a switch in DC power supplies.
2. It is used as rectifiers in voltage stabilizing circuits.
3. It is used as signal diodes in communication circuits.

Which of the above statements is/are correct?

Consider the following statements regarding transistors:

1. They can be made to oscillate with very small power consumption.
2. They cannot sustain mechanical shocks.
3. Their application is limited up to a few mega-cycles only.

Which of the above statements is/are correct?

A field-effect transistor operates with a drain current of 100 mA and a gate source bias of 1 V. The device has dynamic forward transconductance value of 0-25 S. If the bias voltage decreases to 1-2 V, what is the new value of the drain current?

Match the following Lists regarding bipolar junction transistors:

Select the correct answer using the code given below.

Consider the following statements regarding p-n-p transistor:

1. The base-collector junction is reverse biased to holes in the base region and electrons in the collector region.
2. The base region is very thin and is only lightly doped with electrons.
3. A large proportion of the electrons in the base region cross the base-collector junction into the collector region, creating a collector current.

Which of the above statements is/are correct?

For a JFET, the typical values of amplification factor and transconductance are specified as 80 and $200\,\mu\text{S}$ respectively. What is the dynamic drain resistance of this JFET?

There is no need of a driver stage, if FET is used as power amplifier instead of BJT, because

Match the following Lists regarding field-effect transistor amplifiers:

Select the correct answer using the code given below.

Match the following Lists regarding bipolar transistor amplifiers:

Select the correct answer using the code given below.

Consider the following statements regarding frequency response of BJT amplifiers:

1. The CE amplifier has a high gain but a relatively narrow bandwidth.
2. The CC amplifier has a lower gain but a larger bandwidth.
3. The CB amplifier has a higher gain and a larger bandwidth.

Which of the above statements is/are correct?

In a common-collector amplifier stage, the impedance between base and emitter is magnified because of

In Colpitts oscillator circuits, the amount of feedback is controlled by the