In metals the thermal conductivity K and electrical conductivity ? are related a

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Question
In metals the thermal conductivity K and electrical conductivity ? are related as (K/?T) = L, L is known as
Options
A. Lattice constant
B. Lorentz number
C. Lanevin function
D. Larmor number

Correct Answer

Lorentz number

More questions

1. If other parameter are constant, transmission loss at 5 GHz as compared to that at 0.5 GHz is
Options
A. 20 dB more
B. 20 dB less
C. 700 dB more
D. 100 dB less

3. Match the following:

	List I		List II
A.	Tunnel diode	1.	is also known as hot carrier diode
B.	PIN diode	2.	used with reverse bias
C.	Zener diode	3.	has an intrinsic layer
D.	Schottky diode	4.	v-i curve has shape of N

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

4. Assertion (A): When a wattmeter is used for low impedance loads, the pressure coil is connected across the load.
Reason (R): A wattmeter measures apparent power.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true R is false
D. A is false R is true

5. Assertion (A): A transistor requires a continuous base signal for conduction but a thyristor requires a gate pulse.
Reason (R): Transistor find widespread application in power electronic circuits.
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

6. The pole locations of three networks and their impulse responses are given figure

List I List II

A. 1.

B. 2.

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

9. A single phase semiconverter is feeding a highly inductive load and has a freewheeling diode across the load. The waveshape of input current is
Options
A. sinusoidal
B. rectangular
C. sinusoidal or rectangular
D. triangular

10. The main feature of a parametric amplifier is
Options
A. low noise
B. very high gain
C. broad bandwidth
D. both (b) and (c)

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