Discussion
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- Question
When the atom of rare gas is placed in an electric field the nucleus shifts from the centre of electron cloud by an amount x. If the radius of electron cloud is R, then
Options- A. x << R
- B. x ≂ 0.5 R
- C. x ? 0.75 R
- D. x ? R
- Correct Answer
- x << R
- 1. Radar reciever has high sensitivity and low noise figure
Options- A. True
- B. False Discuss
- 2. A single phase electric heater uses phase controlled thyristors. The firing angle is 90°. The degree of heating is
Options- A. 25% of maximum
- B. 50% of maximum
- C. 75% of maximum
- D. none of the above Discuss
- 3. A characteristic property of crystal is its periodicity of structure.
Options- A. True
- B. False Discuss
- 4. The number of distinct Boolean expression of 4 variables is
Options- A. 16
- B. 256
- C. 1024
- D. 65536 Discuss
- 5. Assertion (A): A class C chopper can operate in first and second quadrants
Reason (R): A class B chopper operates only in second quadrant.
Options- A. Both A and R are correct and R is correct explanation of A
- B. Both A and R correct but R is not correct explanation of A
- C. A is correct but R is wrong
- D. A is wrong but R is correct Discuss
- 6. In a conductor the current flow is due to
Options- A. holes
- B. electrons
- C. ions
- D. electrons and ions Discuss
- 7. Which of these commutation methods uses two leads?
Options- A. Class A
- B. Class B
- C. Class C
- D. Class D Discuss
- 8. The ROC of sequence in the Z.T. of sequence x[n] = an ? [n] is
Options- A. z > a
- B. z < a
- C. |z| > a
- D. |z| < a Discuss
- 9. By inserting a plate of dielectric between the plates of a parallel plate capacitor, the energy stored in the capacitor is increased five times. The dielectric constant of material is
Options- A.
- B.
- C. 5
- D. 25 Discuss
- 10. An RLC series circuit is underdamped. To make it overdamped, the value of R
Options- A. has to be increased
- B. has to be decreased
- C. has to be increased to infinity
- D. has to be reduced to zero Discuss
More questions
Correct Answer: True
Correct Answer: 50% of maximum
Explanation:
Conduction occurs only during 50% of wave.
Correct Answer: True
Correct Answer: 65536
Explanation:
22n = 224 = 216 .
Correct Answer: Both A and R correct but R is not correct explanation of A
Correct Answer: electrons
Correct Answer: Class D
Correct Answer: |z| > a
Explanation:
The simplest method to find the ROC. Put denominator to greater than zero.
Correct Answer: 5
Explanation:
Capacitance is directly proportional to dielectric constant.
Correct Answer: has to be increased
Explanation:
For overdamping R is more.
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