Exam Questions Papers - Exam Paper 1 (4)

Directions to Solve

Exam Questions Papers - Exam Paper 1

25.

Consider the signal flow graph shown in figure below. The gain 16-02-8- is :

16-02-8

A.
B.
C.
D.

Answer: Option C

Explanation:

P₁ = abcd

L₁ = be, L₂ = cf, L₃ = dg

Δ₁ = 1

16-05-8

16-05-8-1

26.

In a flash type ADC, employing 15 comparators resolution with 10 volts reference; is expected to be :

A.	0.625 V
B.	0.656 V
C.	0.525 V
D.	insufficient data

Answer: Option A

Explanation:

Since number of comparators = 2ⁿ - 1 = 15;

Then number of bits are '4'

Resolution 3-12-68

27.

The gradient of any scalar field always yields __________ .

A.	a solenoidal field
B.	a conservative field
C.	an irrotational field
D.	none of these

Answer: Option B

Explanation:

Dot product is conservative. Gradient is nothing but dot product.

28.

The equivalent form of the logical expression ABC + A BC + ABC + ABC + AB C is

A.	C + (A ⊕ B)
B.	(A + B + C)(A + B + C)
C.	(A + B + C)(A + B + C)(A + B + C)
D.	(A + B + C)(A + B + C)(A + B + C)

Answer: Option D

Explanation:

AThis can be solve by using Boolean identity but using k map it will be more easy

14-04-3

(A + B + C) (A + B + C) (A + B + C).

29.

When phase-lag compensation is used in a system, then gain cross over frequency, bandwidth and undamped frequency are respectively

A.	Increased, Increased, Increased
B.	Increased, Increased, Decreased
C.	Increased, Decreased, Decreased
D.	Decreased, Decreased, Decreased

Answer: Option D

Explanation:

Phase lag is delay between a correcting signal of control system and response to it.

30.

Consider the following

1.Maximum energy of electrons liberated photoelectrically is independent of light intensity

2.Maximum energy of electrons liberated photoelectrically varies nonlinearly with frequency of incident light.

A.	(1) is true and (2) is false
B.	(1) and (2) both are true
C.	(1) is false and (2) is true
D.	(1) and (2) both are false

Answer: Option A

Explanation:

Statement (ii) is false because maximum energy of photons varies linearly with frequency of incident light. It can be shown as follows :

2-762-24-1

F₁ > F₂ > F₃

j = light intensity = constant

Photocurrent V_s Anode voltage with frequency and incident light as a parameter.

The light intensity is constant.

31.

As the temperature increases the mobility of electrons __________ .

A.	decreases because the number of carries increases with increased collisions
B.	increases because the number of carries decreases with decreased collisions
C.	remains same
D.	none of the above

Answer: Option A

Explanation:

Mobility of electrons 3-07-5

m = 2.5 for electrons and 2.7 for holes in Si.

32.

Consider the common emitter amplifier shown below with the following circuit parameters: β = 100, g_m = 0.3861 A/V, r₀ = ∞ r_p = 259 Ω, R_s = 1 kΩ, R_B = 93 kΩ, R_C = 250 Ω, R_L = 1 kW, C₁ = ∞ and C₂ = 4.7mF.

7-06-48

The resistance seen by the source Vs is

A.	258 Ω
B.	1258 Ω
C.	93 kΩ
D.	∞

Answer: Option B

Explanation:

Z_s = R_s + (R_B || Br_s)

r_c = 2.475 = 1.258 kV

7-09-48

Exam Questions Papers - Exam Paper 1 (4)

Exam Questions Papers - Exam Paper 1

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