-
1.
Linked Answer Questions :
[1] A signal is processed by a casual filter with transfer function G(s). For a distortion free output signal waveform, G(s) must [2 marks]
(A) provide zero phase shift for all frequency
(B) provide constant phase shift for all frequency
(C) provide linear phase shift that is proportional to frequency
(D) provide a phase shift that is inversely proportional to frequency[2] G(z) = αz-1 + βz-3 is a low-pass digital filter with a phase characteristics same as that of the above question if [2 marks]
(A) α = β
(B) α = - β
(C) α = β(1/3)
(D) α = β–(1/3)asked in Electrical Engineering, 2007
View Comments [0 Reply]
-
2.
Statement for Linked Answer Questions :
The associated figure shows the two types of rotate right instructions R1, R2 available in a microprocessor where Reg is a 8-bit register and C is the carry bit. The rotate left instruction L1 and L2 are similar except that C now links the most significant bit of Reg instead of the least significant one.
[1] Suppose Reg contains the 2’s complement number 11010110. If this number is divided by 2 the answer should be [2 marks]
(A) 01101011
(B) 10010101
(C) 11101001
(D) 11101011[2] Such a division can be correctly performed by the following set of operations
[2 marks]
(A) L2, R2, R1
(B) L2, R1, R2
(C) R2, L1, R1
(D) R1, L2, R2asked in Electrical Engineering, 2007
View Comments [0 Reply]
-
3.
Statement for Linked Answer Questions :
Consider the R-L-C circuit shown in figure.
[1] For a step-input ei, the overshoot in the output eo will be [2 marks]
(A) 0, since the system is not under-damped
(B) 5%
(C) 16%
(D) 48%[2] If the above step response is to be observed on a non-storage CRO, then it would be best to have the ei as a [2 marks]
(A) step function
(B) square wave of frequency 50 Hz
(C) square wave of frequency 300 Hz
(D) square wave of frequency 2.0 kHzasked in Electrical Engineering, 2007
View Comments [0 Reply]
-
4.
Statement for Linked Answer Questions :
Cayley –Hamilton Theorem states that a square matrix satisfies its own characteristic equation. Consider a matrix
[1] A satisfies the relation [2 marks]
(A) A + 3I + 2A-1 = 0
(B) A2 + 2A + 2I = 0
(C) (A+I) (A+2I) = 0
(D) exp (A) = 0[2] A9 equals [2 marks]
(A) 511 A + 510 I
(B) 309 A + 104 I
(C) 154 A + 155 I
(D) exp (9A)asked in Electrical Engineering, 2007
View Comments [0 Reply]
-
5.
Statement for Linked Answer Questions :
An inductor designed with 400 turns coil wound on an iron core of 16 cm2 cross sectional area and with a cut of an air gap length of 1mm. The coil is connected to a 230 V, 50 Hz ac supply. Neglect coil resistance, core loss, iron reluctance and leakage inductance. (μo=4π × 10-7 H/m).[1] The current in the inductor is [2 marks]
(A) 18.08 A
(B) 9.04 A
(C) 4.56 A
(D) 2.28 A[2] The average force on the core to reduce the air gap will be [2 marks]
(A) 832.29 N
(B) 1666.22 N
(C) 3332.47 N
(D) 6664.84 Nasked in Electrical Engineering, 2007
View Comments [0 Reply]
-
6.
A1: 1 Pulse transformer (PT) is used to trigger the SCR in the adjacent figure. The SCR is rated at 1.5kV, 250 A with IL=250 mA, IH = 150 mA, and IGmax=150 mA, IGmin =100 mA. The SCR is connected to an inductive load, where L=150 mH in series with a small resistance and the supply voltage is 200 Vdc. The forward drops of all transistors/ diodes and gate- cathode junction during ON state are 1.0 V.
[1] The resistance R should be [2 marks]
(A) 4.7 k Ω
(B) 470 Ω
(C) 47 Ω
(D) 4.7Ω[2] The minimum approximate volt-second rating of the pulse transformer suitable for triggering the SCR should be: (volt-second rating is the maximum of product of the voltage and the width of the pulse that may be applied)
[2 marks]
(A) 2000 μV-s
(B) 200 μV-s
(C) 20 μV-s
(D) 2.0 μV-sasked in Electrical Engineering, 2007
View Comments [0 Reply]