If a metal specimen has n valence electrons per m3 each having charge e and mass

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Question
If a metal specimen has n valence electrons per m³ each having charge e and mass m and t is the relaxations time, the conductivity is
Options
A.
B.
C.
D.

Correct Answer

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2. Match the following:

	List I		List II
A.	Detection of a periodic signal in noise	1.	Increase in band-width
B.	Recovery of a band limited signal from its uniformly sampled values	2.	Slope over load error
C.	Finer quantization	3.	Nyquist rate of signals
D.	Delta modulation	4.	Cross correlation

Options
A. A-4, B-3, C-1, D-2
B. A-3, B-2, C-1, D-4
C. A-4, B-3, C-2, D-1
D. A-3, B-2, C-4, D-1

3. Consider the following statements
1. Fading of signals is generally greatest near radio horizon.
2. Fading of signals is generally greatest in shadow zone.
3. Fading is small when a good optical path is present.
Which of the above statements are correct?
Options
A. 1, 2 and 3
B. 1 and 2 only
C. 1 and 3 only
D. 2 and 3 only

4. In the wave mechanical theory, the maximum of the charge distribution in the ground state occurs for a distance from the nucleus equal to
Options
A. first Bohr radius
B. second Bohr radius
C. third Bohr radius
D. either first or second Bohr radius

5. From a homogeneous and isotropic dielectric material of dielectric constant ?_r, a small volume element is taken out creating a cavity. The field can be kept homogeneous if D_i. (i.e., electric flux density inside the cavity) and D₀ (i.e., electric flux density outside the cavity) are such that
Options
A. D₀ = D_i
B.
C.
D. either (a) or (b)

6. An atom of a rare gas is placed is an electric field E. Then
Options
A. the nucleus will be shifted in the direction of E by an amount which is proportional to E.
B. the nucleus will not be shifted.
C. the nucleus will be shifted in the direction of E by an amount which is independent of E.
D. the nucleus will be shifted in a direction opposite to that of E.

7. Which of the following statement about the advantage of phase discriminator over the slope detector is false?
Options
A. Fewer tuned circuits
B. Better linearity
C. Greater limiting
D. Much easier alignment

8. A 3 phase induction motor is fed by a 3 phase ac regulator to change the stator voltage. The variation in speed will be more if
Options
A. load torque is constant
B. load torque increases with increase in speed
C. load torque decreases with increase in speed
D. either (a) or (b)

9. Match the following:

	List I (type of controller)		List II (Operation)
A.	Pneumatic controller	1.	Flexible operation
B.	Hydraulic controller	2.	High torque high speed operation
C.	Electronic controller	3.	Fire and explosion proof operation

Options
A. A-1, B-3, C-2
B. A-1, B-2, C-3
C. A-3, B-1, C-2
D. A-3, B-2, C-1

10. Which of the following are true for magic tee in the given figure select the answer as per given codes
1. S₁₃ = S₂₃
2. S₁₄ = S₂₄
3. S₁₂ = 0
4. S₃₄ = 0
Options
A. 1, 2 and 3
B. 1, 2 and 4
C. 2, 3 and 4
D. 1, 3 and 4

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