Question is ⇒ If t is relaxation time and tc is average time between collisions, then in an isotropic metal, Options are ⇒ (A) t = tc, (B) t < tc, (C) tc < t, (D) T = 0.01 te, (E) , Leave your comments or Download question paper.

Question is ⇒ If t is relaxation time and tc is average time between collisions, then in an isotropic metal, Options are ⇒ (A) t = tc, (B) t < tc, (C) tc < t, (D) T = 0.01 te, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	If t is relaxation time and t_c is average time between collisions, then in an isotropic metal
A.	t = t_c [Correct Answer]
B.	t < t_c [Wrong Answer]
C.	t_c < t [Wrong Answer]
D.	T = 0.01 t_e [Wrong Answer]
View Answer 1 -2 Explanation:- Answer : A Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

Previous question Next question

Also Read Similar Questions Below :

⇒ The magnitude plot of a composite signal x(t) = e^3jt + e^4jt is __________ .
Half wave rectified sinusoid
Full wave rectified sinusoid
Exponentially increasing sinusoid
Exponentially decreasing sinusoid

⇒ During testing of an energy meter, the energy recorded by meter was 0.05 kWh and correct energy was found to be 0.09 kWh. The error and correction respectively are
-0.01 kWh and 0.01 kWh
0.01 kWh and -0.01 kWh
-0.01 kWh and ± 0.01 kWh
± 0.01 kWh and 0.01 kWh

⇒ The ripple factor of a full wave rectifier is about 0.5
TRUE
FALSE

⇒ The sum of positive real functions
is a positive real function
may be a positive real function or not
can not be a positive real function
either (b) or (c)

⇒ In a synchro error detector, the output voltage is proportional to [ω(t)]ⁿ, where ω(t) is the rotor velocity and n equals :
-2
-1
1
2

⇒ If f(t) = - f(- t) and f(t) satisfies Dirichlet conditions, then f(t) can be expanded in Fourier series having
sine terms only
cosine terms only
cosine and constant terms
sine and constant term

⇒ The access time of a word in 4 MB main memory is 100 ms. The access time of a word in a 32 kb data cache memory is 10 ns. The average data cache bit ratio is 0.95. The efficiency of memory access time is
9.5 ns
14.5 ns
20 ns
95 ns

⇒ In a 7 segment display the segments a, c, d, f, g are lit. The decimal number displayed will be
9
5
4
2

⇒ The counter shown in figure is built using 4 negative edge triggered toggle FFs. The FFs can be set synchronously when R = 0. The combinational logic required to realize a modulo 13 counte
F= Q₄ Q₃ Q₂ Q₁
F= Q₄ + Q₃ + Q₂ + Q₁
F = Q₄ + Q₃ + Q₂ + Q₁
F = Q₄ Q₃ Q₂ Q₁

⇒ A voltage wave containing 10% third harmonic is applied to a scries R-L circuit. The percentage third harmonic content in the current wave will be
more than 10%
10% or less than 10%
less than 10%
10% or more or less

⇒ In the vacuum diode equation i_b = ke_b^1.5, the current is
temperature limited current
space charge limited current
any of the above
none of the above

⇒

Assertion (A): The speed of a shaft can be measured by using a dc tacho generator.

Reason (R): A two phase servometer can also be used as a speed transducer.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true R is false
A is false R is true

⇒ In every practical oscillator the loop gain is slightly more than unit and amplitude of oscillations is limited by
magnitude of loop gain
onset of non-linearity
magnitude of gain
β

⇒ The specified maximum junction temperature of thyristors is about
50°C
80°C
120°C
200°C

⇒ Pressing a key on telephone set generates two frequencies. The basis for selection of these frequencies is
the harmonics of one frequency should not be mistaken for the other frequency
the audio input to the handset transmitter should not be mistaken for a key pressing
both (a) and (b)
neither (a) nor (b)

⇒ For what positive value of K does the polynomial s⁴ + 8s³ + 24s² + 32s + K have roots with zero real parts?
10
20
40
80

⇒ In a series R-L circuit when excited by a 1 volt battery the current is 1 - e^-t. If it is excited by a source 2 sin t, the current will be
2 sin (t - 45°) + e^-t
2 sin (t + 45°) + e^-t
sin (t - 45°) + e^-t
sin (t + 45°) + e^-t

⇒ In a specimen of silicon steel, a field strength of 200 A/m causes a flux density of 0.5 T. In a specimen of cast iron, the same H would cause B to be
0.5 T
less than 0.5 T
more than 0.5 T
0.5 T or more or less

⇒ If the characteristic equation is (λ + 1) (λ + 2) (λ + 3) = 0, the eigen values are
-1, -2, -3
1, 2, 3
0, 1, 2
0, 2, 3

⇒ In low power factor wattmeter, the pressure coil is connected
to the supply side of current coil
to the load side of current coil
in either (a) or (b)
across the mains

⇒ Which of the following is true in a tape recorder?
Vow is due to variation in motor speed but flutter is due to some other reason
Both vow and flutter are due to variations in motor speed
Flutter is due to variation in motor speed but vow is due to some other reason
Neither vow nor flutter is due to variation in motor speed

⇒ How many interrupts are there in 8085 microprocessor?
4
5
6
8

⇒ A discrete time linear shift-invariant system has an impulse response h[n] with h[0] = 1, h[1] = - 1, h[2] - 2, and zero otherwise. The system is given an input sequence x[n] with x[0] - x[2] - 1, and zero otherwise. The number of nonzero samples in the output sequence y[n], and the value of y[2] are, respectively
5, 2
6, 2
6, 1
5, 3

⇒ The drift velocity of electrons and holes is proportional to electric field strength.
TRUE
FALSE

⇒ I-PD controlled system has
I, P and D actions in forward path
I, P and D actions in feedback path
I action in forward path but P and D action in feedback path
I action in feedback path but P and D actioins in forward path

⇒ For the block diagram of the given figure, the equation describing system dynamic
(1 + RCs) Δθ₀(s) = Δθ_i(s) + R Δ H(s)
(1 + RCs) [ΔH(s)] = Δθ(s) - Δθ₀(s)
(1 + RCs) Δθ₀(s) = RΔ H(s) - Δ θ_i(s)
(1 + RCs) Δθ_i(s) = Δ H(s)[R] - Δθ₀(s)

⇒ The snubber circuit consists of
a capacitor connected in series with thyristor
a capacitor connected in parallel with thyristor
a resistor and capacitor in series connected across thyristor
none of the above

⇒ A resistor is rated at 0.75 watt, 1 kΩ. Its current rating is
1 mA
27.386 mA
1.268 mA
5.393 mA

⇒ The encapsulation of transistor is necessary for
preventing radio interference
preventing photo-emission effects
avoiding loss of free electrons
mechanical ruggedness

⇒ The INTELSAT-IV satellite launched in 1974 had two earth coverage antenna and two narrower-angle antennas subtending 4.5°. The signal from narrow-angle antenna was stronger than that from earth- coverage antenna by a factor of
17.34/4.5
17.34 x 4.5
(17.34/4.5)²
(17.34/4.5)⁴