IV MCQ

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• Control system are normally designed to be:
  ক

  Overdamped

  খ

  Under damped

  গ

  Un damped

  ঘ

  Critically damped
• Rise time, Peak time, maximum peak overshoot, settling time, and steady state error are mutually dependent.
  ক

  True

  খ

  False
• Normalized difference between the time response peak and steady state output is ______________
  ক

  Maximum peak overshoot

  খ

  Damping factor

  গ

  Minimum peak overshoot

  ঘ

  Undershoot
• The characteristic equation of a control system is s(s2+ 6s+13)+K=0. The value of k such that the characteristic equation has a pair of complex roots with real part -1 will be :
  ক

  10

  খ

  20

  গ

  30

  ঘ

  40
• The transfer function of a system is G(s) = 100/(s+1) (s+100). For a unit step input to the system the approximate settling time for 2% criterion is:
  ক

  100 sec

  খ

  4 sec

  গ

  1 sec

  ঘ

  0.01 sec
• Normalized response of a dynamic system refers to:
  ক

  Characteristic feature of a response due to specific excitation irrespective of its amplitude

  খ

  Response of dynamic system divided by its maximum value

  গ

  Response of dynamic system divided by a standard value

  ঘ

  None of the mentioned
• Undamped natural frequency of a second order system has the following influence on the response due to various excitations:
  ক

  Increase in speed of response and decrease sensitivity

  খ

  Decrease in speed of response and increase sensitivity

  গ

  Has no influence in the dynamic response

  ঘ

  Increase oscillatory behavior
• In a second order feedback control system natural frequency and damping
  ক

  Can be designed by changing the gain of the individual system

  খ

  Cannot be designed by changing the gain of the individual system

  গ

  Are independent on the type of input excitation

  ঘ

  None of the mentioned
• Consider the input with the inputs 4 u(t) and the impulse response 5 +7 , the time constants of the output are,
  ক

  0.2, 0.33 and 0.5

  খ

  4.5 and 7

  গ

  0.2, 0.4 and 0.7

  ঘ

  0.2, 0.1 and 0.25
• The standard second order system to a unit step input shows the 0.36 as the first peak undershoot, hence its second overshoot is:
  ক

  0.135

  খ

  0.216

  গ

  0.1296

  ঘ

  0.116
• Reduce the following Big-O notation. O = . b) O. c) O. d) O.
  ক

  = ] O.

  খ

  ax7 + 3 x3 + sin(x)

  গ

  ax7 + 3 x3 + sin(x)

  ঘ

  ax7 + 3 x3 + sin(x)
• 12. For p = 11 and q = 17 and choose e=7. Apply RSA algorithm where Cipher message=11 and thus find the plain text.
  ক

  88

  খ

  122

  গ

  143

  ঘ

  111
• Using SDES, the Plaintext for the Ciphertext 00001111, given that the key is 1111111111 is,
  ক

  01100111

  খ

  00001010

  গ

  11111111

  ঘ

  01101101
• Using Differential Crypt-analysis, the minimum computations required to decipher the DES algorithm is-
  ক

  256

  খ

  243

  গ

  255

  ঘ

  247
• In the DES algorithm the Round Input is 32 bits, which is expanded to 48 bits via ______________
  ক

  Scaling of the existing bits

  খ

  Duplication of the existing bits

  গ

  Addition of zeros

  ঘ

  Addition of ones
• Which function can be used in AES multiplication –
  ক

  m(x)=x7+x4+x3

  খ

  m(x)=x8+x4+x3+x+1

  গ

  m(x)=x8+x3+x2+x+1

  ঘ

  m(x)=x8+x5+x3+x
• The inverse s-box permutation follows, b’i = b(i+2) XOR b(i+5) XOR b(i+7) XOR di Here di is –
  ক

  di is the ith bit of a byte ‘d’ whose hex value is 0x15

  খ

  di is the ith bit of a byte ‘d’ whose hex value is 0x05

  গ

  di is the ith bit of a byte ‘d’ whose hex value is 0x25

  ঘ

  di is the ith bit of a byte ‘d’ whose hex value is 0x51
• In AES, to make the s-box, we apply the transformation – b’i = bi XOR b(i+4) XOR b(i+5) XOR b(i+6) XOR b(i+7) XOR ci What is ci in this transformation?
  ক

  ci is the ith bit of byte c with value 0x63

  খ

  ci is the ith bit of byte c with value 0x25

  গ

  ci is the ith bit of byte c with value 0x8F

  ঘ

  ci is the ith bit of byte c with value 0x8A
• How many bit positions are active and can affect L in the Iota step function?
  ক

  in the Iota step function? ] 8

  খ

  0, 0

  গ

  0, 0

  ঘ

  0, 0
• Which is the only step function that provides non-linear mapping?
  ক

  Theta

  খ

  Rho

  গ

  Pi

  ঘ

  Chi
• In SHA-3, the Iota step function has a round constant which only works on the last lane.
  ক

  True

  খ

  False
• The Chi function is defined as ← a XOR ( aXOR 1) AND a) b) a ← a AND ( aXOR 1) AND a) c) a ← a AND ( a XOR a) d) a ← a XOR ( a AND a)
  ক

  a ← a XOR ( aXOR 1) AND a)

  খ

  x

  গ

  x

  ঘ

  x
• The Rho function is defined as : a ← a, where g(t) is defined as
  ক

  ← a, where g(t) is defined as ] (t+1)(t+2)/2

  খ

  x, y, z

  গ

  x, y, z

  ঘ

  x, y, z
• What are the new co-ordinates for (x, y) in the Rho step for t =3?
  ক

  (1, 7)

  খ

  (1, 4)

  গ

  (3, 2)

  ঘ

  none of the mentioned
• Which matrix is used in the Rho/ Pi steps? t b) t c) t d) t
  ক

  t

  খ

  (1 2 | 3 4)

  গ

  (1 2 | 3 4)

  ঘ

  (1 2 | 3 4)
• The CHI step involves which of the following gate operations?
  ক

  AND and NAND

  খ

  AND and XOR

  গ

  XOR and NAND

  ঘ

  XOR and XNOR
• The Pi step function can be written as-
  ক

  (x, y) × (y, (x + y))

  খ

  (x, y) × (y, (2x + 3y))

  গ

  (x, 2y) × (y, (2x + 3y))

  ঘ

  (x, 2y) × (y, (x + y))
• Which step function provides most amount of diffusion for the Keccak iteration step?
  ক

  Theta

  খ

  Rho

  গ

  Pi

  ঘ

  Chi
• In the Theta step function, which is a substitution step, each bit value changes. Each bit is dependent on _________ other bits for its new value.
  ক

  13

  খ

  4

  গ

  7

  ঘ

  11
• GCD(n,n+1) = 1 always.
  ক

  True

  খ

  False