The symmetric difference of two sets S1 and S2 is defined as S1ΘS2 = {x|xϵS1 or xϵS2, but x is not in both S1 and S2} The nor of two languages is defined as nor (L1,L2) = {w|w ∉ L1 and w|w ∉ L2} Which of the following is correct? (A) The family of regular languages is closed under symmetric difference but not closed under nor. (B) The family of regular languages is closed under nor but not closed under symmetric difference. (C) The family of regular languages are closed under both symmetric difference and nor. (D) The family of regular languages are not closed under both symmetric difference and nor.

The symmetric difference of two sets S1 and S2 is defined as

S1ΘS2 = {x|xϵS1 or xϵS2, but x is not in both S1 and S2}

The nor of two languages is defined as

nor (L1,L2) = {w|w ∉ L1 and w|w ∉ L2}

Which of the following is correct?

(A) The family of regular languages is closed under symmetric difference but not closed under nor.

(B) The family of regular languages is closed under nor but not closed under symmetric difference.

(C) The family of regular languages are closed under both symmetric difference and nor.

(D) The family of regular languages are not closed under both symmetric difference and nor.
by

1 Answer

Answer :

(C) The family of regular languages are closed under both symmetric difference and nor.
by

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Last Answer : Answer: C

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Last Answer : a. P/E(L1/A1+L2/A2+L3/A3)

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Last Answer : Answer: 4

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Description : Given the following Series S1 and S2: Write the command to find the sum of series S1 and S2 -Technology

Last Answer : print(S1+S2)

If coils 'R1-R2-R3' at the receiver of figure 'B' shown in the illustration turned opposite of those in the transmitter by design, what corrective action should be taken? EL-0092 A. Reverse the 60 Hz supply connections to 'S1' and 'S2'. B. No action is needed. C. Interchange leads 'R1' and 'R3'. D. Interchange leads 'R2' and 'R3'.

Description : If coils 'R1-R2-R3' at the receiver of figure 'B' shown in the illustration turned opposite of those in the transmitter by design, what corrective action should be taken? EL-0092 A. Reverse the 60 Hz supply ... is needed. C. Interchange leads 'R1' and 'R3'. D. Interchange leads 'R2' and 'R3'.

Last Answer : Answer: B

If coils 'R1-R2-R3' at the receiver of figure 'B' shown in the illustration were in 180 degree error with those of the transmitter, what corrective action should be taken? EL-0092 A. Reverse the 60 Hz connections to 'S1' and 'S2'. B. No action is needed as this is proper operation. C. Interchange leads 'R1' and 'R3'. D. Interchange leads 'R2' and 'R3'.

Description : If coils 'R1-R2-R3' at the receiver of figure 'B' shown in the illustration were in 180 degree error with those of the transmitter, what corrective action should be taken? EL-0092 A. Reverse the 60 Hz ... is proper operation. C. Interchange leads 'R1' and 'R3'. D. Interchange leads 'R2' and 'R3'.

Last Answer : Answer: A

If coil 'R1-R2' at the receiver of figure 'A' shown in the illustration were in 180 degree error with respect to that of the transmitter, what corrective action should be taken? EL-0092 A. No action is necessary as this is proper operation. B. Reverse the 60 Hz supply connections at 'R1' and 'R2'. C. Interchange connections 'S1' and 'S2'. D. Interchange connections 'S1' and 'S3'.

Description : If coil 'R1-R2' at the receiver of figure 'A' shown in the illustration were in 180 degree error with respect to that of the transmitter, what corrective action should be taken? EL-0092 A. No action is ... and 'R2'. C. Interchange connections 'S1' and 'S2'. D. Interchange connections 'S1' and 'S3'.

Last Answer : Answer: B

If coil 'R1-R2' at the receiver of figure 'A' shown in the illustration turned opposite of that in the transmitter, what corrective action should be taken? EL-0092 A. No action is necessary as this is normal operation. B. Reverse 60 Hz supply connections to 'R1' and 'R2'. C. Interchange connections to 'S1' and 'S2'. D. Interchange connections to 'S1' and 'S3'.

Description : If coil 'R1-R2' at the receiver of figure 'A' shown in the illustration turned opposite of that in the transmitter, what corrective action should be taken? EL-0092 A. No action is necessary as this is ... . C. Interchange connections to 'S1' and 'S2'. D. Interchange connections to 'S1' and 'S3'.

Last Answer : Answer: D

If coil 'R1-R2' on the transmitter in figure 'A' shown in the illustration is turned 30 degrees clockwise, corresponding coil 'R1-R2' on the receiver should ____________. EL-0092 A. make coils 'S1-S2-S3' turn faster because of induced currents B. ring at the receiving station until the turning stops C. receive a higher voltage depending on the turns ratio D. align itself to the same position if free to move

Description : If coil 'R1-R2' on the transmitter in figure 'A' shown in the illustration is turned 30 degrees clockwise, corresponding coil 'R1-R2' on the receiver should ____________. EL-0092 A. make coils 'S1 ... a higher voltage depending on the turns ratio D. align itself to the same position if free to move

Last Answer : Answer: D

Derivation of Thiem's formula Q = 2 (s1 - s2)/2.3 log10 (r2/r1) is based on the assumption (A) The aquifer is homogeneous, isotropic and of infinite depth and area (B) The well is sunk through the full depth of the aquifer (C) The flow lines are radial and horizontal, and the flow is laminar (D) All the above

Description : Derivation of Thiem's formula Q = 2 (s1 - s2)/2.3 log10 (r2/r1) is based on the assumption  (A) The aquifer is homogeneous, isotropic and of infinite depth and area  (B) The well is sunk ... (C) The flow lines are radial and horizontal, and the flow is laminar  (D) All the above 

Last Answer : (D) All the above 

S1 and S2 are the draw downs in an observation well at times t1 and t2 after pumping. For discharge Q and coefficient of transmissibility T, the relationship, is (A) S2 - S1 = (2.3Q/ ) log10 (t2/t1) (B) S2 - S1 = (2.3Q/4 ) log10 (t2/t1) (C) S2 - S1 = (2.3Q/4 ) loge (t2/t1) (D) S2 - S1 = (2.3Q/4 ) loge (t1/t2

Description : S1 and S2 are the draw downs in an observation well at times t1 and t2 after pumping. For  discharge Q and coefficient of transmissibility T, the relationship, is  (A) S2 - S1 = (2.3Q/ ) log10 (t2/t1)  (B) S2 - S1 ... - S1 = (2.3Q/4 ) loge (t2/t1)  (D) S2 - S1 = (2.3Q/4 ) loge (t1/t2

Last Answer : (B) S2 - S1 = (2.3Q/4 ) log10 (t2/t1)