Let pk(R) denotes primary key of relation R. A many-to-one relationship that exists between two relations R1 and R2 can be expressed as follows: (1) pk(R2)→pk(R1) (2) pk(R1)→pk(R2) (3) pk(R2)→R1∩R2 (4) pk(R1)→R1∩R2

Let pk(R) denotes primary key of relation R. A many-to-one relationship that exists between two relations R1 and R2 can be expressed as follows: (1) pk(R2)→pk(R1) (2) pk(R1)→pk(R2) (3) pk(R2)→R1∩R2 (4) pk(R1)→R1∩R2
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Let M and N be two entities in an E-R diagram with simple single vale attributes. R1 and R2 are two relationship between M and N, whereas R1 is one-to-many and R2 is many-to-many. The minimum number of tables required to represent M, N, R1 and R2 in the relational model are .......... (1) 4 (2) 6 (3) 7 (4) 3

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Last Answer : (C) (a) and (c) happens 

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ey to represent relationship between tables is called (A) Primary key (B) Secondary Key (C) Foreign Key (D) None of these

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Last Answer : Answer: 2

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Last Answer : Answer: B

Consider a system with seven processes A through G and six resources R through W. Resource ownership is as follows: process A holds R and wants T process B holds nothing but wants T process C holds nothing but wants S process D holds U and wants S & T process E holds T and wants V process F holds W and wants S process G holds V and wants U Is the system deadlocked ? If yes, ............. processes are deadlocked. (A) No (B) Yes, A, B, C (C) Yes, D, E, G (D) Yes, A, B, F

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Last Answer : (C) Yes, D, E, G

Let the time taken to switch between user mode and kernel mode of execution be T1 while time taken to switch between two user processes be T2. Which of the following is correct? (A) T1 < T2 (B) T1 > T2 (C) T1 = T2 (D) Nothing can be said about the relation between T1 and T2.

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Last Answer : (A) T1 < T2

Let L be the language generated by regular expression 0*10* and accepted by the deterministic finite automata M. Consider the relation RM defined by M. As all states are reachable from the start state, RM has ................ equivalence classes. (A) 2 (B) 4 (C) 5 (D) 6

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Last Answer : (D) 6

Consider the relations R(A,B) and S(B,C) and the following four relational algebra queries over R and S: I. πA,B(R⋈S) II. R⋈πB(S) III. R∩(πA(R) Χ πB(S)) IV. πA,R.B(R Χ S) where R.B refers to the column B in table R. One can determine that: (A) I, III and IV are the same query. (B) II, III and IV are the same query. (C) I, II and IV are the same query. (D) I, III and III are the same query.

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Two planets have the same density of matter, such that their masses are proportional to the cube of their radii. The ratio of their acceleration due to gravity on their surfaces is (a) r2/r1 (b) (r1/r2)2 (c) r1/r2 (d) (r2/r1)2

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Last Answer : Ans:(d) Direction: In the following question, a statement of Assertion (A) is given followed by corresponding Reason (R), just below it. Read the statements carefully and mark the correct answer: (a) If both A and ... true but R is not the correct explanation of A. (c) If A is true but R is false

A series circuit consists of two resistors in series. R1 = 25 ohms and R2 = 30 ohms. The circuit current is 6 amps. What is the (a) source voltage, (b) voltage dropped by each resistor, (c) total power, and (d) power used by each resistor?

Description : A series circuit consists of two resistors in series. R1 = 25 ohms and R2 = 30 ohms. The circuit current is 6 amps. What is the (a) source voltage, (b) voltage dropped by each resistor, (c) total power, and (d) power used by each resistor?

Last Answer : (a) 330 volts. (b) E1 = 150 volts. E2 = 180 volts. (c) 1.98 kilowatts. (d) P1 = 900 watts. P2 = 1.08 kilowatts component but in a parallel circuit total current divides among the available paths.

Two resistances R1 and R2 give combined resistance of 4.5 ohms when...

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What is the Voltage drop of R1 If V 10 Volts R1 500 Ohms and R2 1500 Ohms?

Description : What is the Voltage drop of R1 If V 10 Volts R1 500 Ohms and R2 1500 Ohms?

Last Answer : You need to mention whether the resistors are in series or parallel to get the right answer

What is the total current is V is 10 Volts R1 is 500 Ohms and R2 is 1500 ohms?

Description : What is the total current is V is 10 Volts R1 is 500 Ohms and R2 is 1500 ohms?

Last Answer : We need to find R equivalent at first then divide V from it to find the total current.Case 1: If resistances are connected in series.Then, R(eq.) = R1 + R2 = 500 + 1500 = 2000 ohmSo, Total current, I = V/R(eq.) = ... (500 + 1500) = 400 ohmSo, Total current, I = V/R(eq.) = 10/400 = 1/40 or 0.025 A.

What is the total resistance is V is 10 volts R1 is 1000 ohms and R2 is 1000 Ohms?

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What is the total current of the illustrated circuit if the battery is 12 VDC and the resistance of R1 is 2 ohms, R2 is 3 ohms and R3 is 6 ohms? EL-0021 A. 2 amps B. 4 amps C. 6 amps D. 12 amps

Description : What is the total current of the illustrated circuit if the battery is 12 VDC and the resistance of R1 is 2 ohms, R2 is 3 ohms and R3 is 6 ohms? EL-0021 A. 2 amps B. 4 amps C. 6 amps D. 12 amps

Last Answer : Answer: D

In the illustrated circut, if the resistance of R1 is 10 ohms, R2 is 10 ohms, and R3 is 10 ohms. What is the total resistance? EL-0032 A. 15 ohms B. 20 ohms C. 25 ohms D. 30 ohms

Description : In the illustrated circut, if the resistance of R1 is 10 ohms, R2 is 10 ohms, and R3 is 10 ohms. What is the total resistance? EL-0032 A. 15 ohms B. 20 ohms C. 25 ohms D. 30 ohms

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The electrical diagram shown in the illustration shows _____________. EL-0021 A. 'R1', 'R2', and 'R3' are connected is series B. 'R1', 'R2', and 'R3' are connected in parallel C. the voltages measured across 'R1', 'R2' and 'R3' will be different if 'R1', 'R2' and 'R3' have different values D. the total resistance equals R1 + R2 + R3

Description : The electrical diagram shown in the illustration shows _____________. EL-0021 A. 'R1', 'R2', and 'R3' are connected is series B. 'R1', 'R2', and 'R3' are connected in parallel C. the voltages measured across ... if 'R1', 'R2' and 'R3' have different values D. the total resistance equals R1 + R2 + R3

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As shown in the illustration, if 'R1' and 'R2' have unequal values, the ____________. EL-0019 A. voltage drop across 'R1' will not be equal to the voltage drop across 'R2' B. current flow through 'R1' will equal the current flow through 'R2' C. the energy dissipated in 'R1' will be the same as the energy dissipated in 'R2' D. current flow through 'R1' will differ from the current flow through 'R2'

Description : As shown in the illustration, if 'R1' and 'R2' have unequal values, the ____________. EL-0019 A. voltage drop across 'R1' will not be equal to the voltage drop across 'R2' B. current flow ... energy dissipated in 'R2' D. current flow through 'R1' will differ from the current flow through 'R2'

Last Answer : Answer: D

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'.

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Last Answer : Answer: B

As shown in the illustration if the applied voltage is 12 VDC, the resistance of R1 is 24 kohms, and R2 is 3610 ohms what is the current flowing through R1? EL-0036 A. .434 milliamps B. .005 amp C. 6.00 amps D. 2.4 milliamps

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Last Answer : Answer: A

As shown in the illustration if the applied voltage is 12 VDC, the resistance of R1 is 10 ohms, and R2 is 10 ohms what is the total power consumed by R1? EL-0036 A. 3.6 watts B. 72 watts C. 7.2 watts D. 36 watts

Description : As shown in the illustration if the applied voltage is 12 VDC, the resistance of R1 is 10 ohms, and R2 is 10 ohms what is the total power consumed by R1? EL-0036 A. 3.6 watts B. 72 watts C. 7.2 watts D. 36 watts

Last Answer : Answer: A