Discussion
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- Question
During processing the instructions, data, intermediate results and final results in a computer are held in
Options- A. CPU
- B. ALU
- C. Primary memory
- D. Secondary memory
- Correct Answer
- Primary memory
ExplanationPrimary memory holds these during processing of instructions.
Microprocessors problems
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- 1. Which of the following is a computer language?
Options- A. MS WORD
- B. Page maker
- C. MS EXCEL
- D. LISP Discuss
Correct Answer: LISP
Explanation:
LISP is a computer language. The remaining are software packages.- 2. In
ALU 1C 74181 the addition and subtraction is in
Options- A. 2's complement
- B. 1's complement
- C. binary
- D. none of the above Discuss
Correct Answer: 2's complement
Explanation:
2's complement is universally used in computers.- 3. Which of the following can be accessed only sequentially?
Options- A. Floppy disk
- B. Hard disk
- C. Magnetic tape
- D. ROM Discuss
Correct Answer: Magnetic tape
Explanation:
Magnetic tape can be accessed only sequentially.- 4. Which of the following devices uses a slow wave structure?
Options- A. Klystron two cavity amplifier
- B. Klystron multicavity amplifier
- C. Reflex klystron oscillator
- D. TWT Discuss
Correct Answer: TWT
Explanation:
In a klystron the resonant structure limits the bandwidth.A TWT is a broadband device. Its main components are electron gun (to produce the electron beam) and a structure supporting the slow electromagnetic wave.
The velocity of wave propagation along the helix structure is less than velocity of light.
The beam and wave travel along the structure at the same speed.
Thus interaction occurs between beam and wave and the beam delivers energy to the RF wave.
Therefore the signal gets strengthened and amplified output is delivered at the other end of tube.
The main features of TWT are :
1. Frequency range - 0.5 GHz to 90 GHz
2. Power output - 5 mW at low frequencies(less than 20 GHz) 250 kW (continuous wave) at 3 GHz 10 MW (pulsed) at 3 GHz
3. Efficiency - about 5 to 20%
4. Noise - about 5 dB for low power TWT 25 dB for high power TWT
TWT is used as RF amplifier in broadband microwave receivers, repeater amplifier in broad band communication systems, communication satellites etc.
- 5. For a 50 ? resistor for 3 GHz application, the stray capacitance should be less than
Options- A. 1 ?F
- B. 1 nF
- C. 1 pF
- D. 0.1 pF Discuss
Correct Answer: 0.1 pF
Explanation:
XC should be at least ten times greater than R. Therefore for 50 ? resistor at 3 GHz, C should be less than 0.1 pF.- 6. When .4546 E 5 and .5433 E 7 are to be added in normalized floating point mode
Options- A. none of the numbers is changed to any other form
- B. .4546 E 5 is changed .004546 E 7 and .5433 E 7 is not changed
- C. .5433 E 7 is changed to 54.33 E 5 and .4546 E 5 is not changed
- D. both the numbers are changed and their exponents are made equal to 6 Discuss
Correct Answer: .4546 E 5 is changed .004546 E 7 and .5433 E 7 is not changed
Explanation:
Exponents are made equal and integer part is made zero.- 7. Expression ++i is equivalent to
Options- A. i = i + 2
- B. i = i + 1
- C. i = i - 1
- D. i = i + i + i Discuss
Correct Answer: i = i + 1
Explanation:
i is incremented by 1.- 8.
JCOKE = 3
JCOKE = JCOKE + 1
GO TO (5, 8, 9, 11, 15, 16 18, 20) JCOKE.
After the execution of above statement, the control is transferred to statement number
Options- A. 8
- B. 11
- C. 16
- D. 20 Discuss
Correct Answer: 11
Explanation:
It is a computed GO TO statement. Since J COKE = 3 + 1 = 4, the control is transferred to statement 11.- 9. The size of cache memory in most microcomputers is about
Options- A. a few bytes
- B. a few kilobytes
- C. a few megabytes
- D. a few gigabytes Discuss
Correct Answer: a few kilobytes
Explanation:
Size of Cache memory varies from about 16 K bytes to about 256 K bytes.- 10. Temporary register in 8085 is a 16 bit register.
Options- A. True
- B. False Discuss
Correct Answer: False
Explanation:
It is 8 bit-register.
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