In a synchronous modem, the digital-to-analog converter transmits signal to the

You are configuring a Windows 2000 Server computer as a Routing and Remote Access server for a Branch office. You discover that an incorrect driver was installed during the installation of the modem. You attempt to remove the modem by using Phone and Modem Options in Control Panel. After each attempt to remove the modem by using this method, the computer stops responding. You restart the computer again. You must install the correct driver for the modem as quickly as possible. What should you do?

A

Use the Add/Remove Hardware wizard to uninstall the modem. Restart the server

B

Shut down the server, remove the modem card, and restart the server. Shut down the server again, insert the modem card, and restart the server

C

Delete all references to modems in the registry

D

Run the Modem troubleshooter and remove the modem when prompted. Restart the server

E

None of above

In case of synchronous motor, which of the following are true? a. Synchronous motor is not self-starting b. If the rotor poles are excited by field current and the stator terminals are connected to AC supply, motor vibrates. c. Variable frequency supply is used to start synchronous motor. d. By using frequency converter, a synchronous motor can be brought from standstill to its desired speed.

A

Only a and b are true

B

Only b and c are true

C

All are true

D

None of the above

Your Windows 2000 Server computer uses a non-Plug and Play ISA modem configured to use IRQ 5. You add a PCI modem and restart the computer. Device Manager reports an IRQ conflict between the two modems. Both modem are trying to use IRQ 5. You want to resolve the problem. What should you do?

A

Use Device Manager to change the IRQ for the original modem to IRQ 9

B

Use Device Manager to change the IRQ for the original modem to IRQ 10

C

Edit the CMOS settings on the computer to reserve IRQ 5 for non-Plug and Play devices

D

Edit the CMOS settings on the computer to reserve IRQ 10 for non-Plug and Play devices

E

None Of above

Consider the following statements regarding synchronous machines: 1. When a synchronous motor is over-excited, its back emf is greater than the supply voltage 2. When a synchronous motor is over-excited, its power factor is leading 3. Synchronous motor is used as capacitor where load is so large that construction of a static capacitor is impractical Which of these statements are correct?

A

1 and 2

B

1 and 3

C

2 and 3

D

1, 2 and 3

Which of the following statements are correct for synchronous motors? 1. Synchronous motors are well-suited for direct connection top reciprocating compressors. 2. Over-excited synchronous motors are most commonly used for power factor improvement. 3. Synchronous motors are generally used for current regulation of long transmission lines Select the correct answer using the code given below.

A

1, 2 and 3

B

1 and 3 only

C

1 and 2 only

D

2 and 3 only

A three-phase cylindrical rotor synchronous generator has a synchronous reactance Xs and a negligible armature resistance. The magnitude of per phase terminal voltage is VA and the magnitude of per phase induced emf is EA. Considering the following two statements, P and Q, P: For any three-phase balanced leading load connected across the terminals of this synchronous generator, VA is always more than EA Q: For any three-phase balanced lagging load connected across the terminals of this synchronous generator, VA is always less than EA Which of the following options is correct?

A

P is false and Q is true

B

P is true and Q is false

C

P is false and Q is false

D

P is true and Q is true

In case of three-phase dual converter, one of the converter circuits is fired at an angle of 60°. For both the converter circuits to have equal average output voltage, what is the value of the firing angle for the other converter circuit?

A

60°

B

120°

C

100°

D

Insufficient data

Consider the following statements regarding modulation : 1. The communication systems, where a weak signal is transmitted by the use of a modulation is essential in carrier signal. 2. When the frequency of the high frequency signal is varied in accordance with the intensity of the low-frequency weak signal, the modulation is said to be frequency modulation. 3. The process of recovering original baseband signal from the modulated signal is called phase modulation. Which of the above statements are correct ?

A

1 and 3 only

B

1 and 2 only

C

2 and 3 only

D

1, 2 and 3

Consider the following solution to the producer-consumer synchronization problem. The shared buffer size is ?. Three semaphores empty, full and mutex are defined with respective initial values of 0, ? and 1. Semaphore empty denotes the number of available slots in the buffer, for the consumer to read from. Semaphore denotes the number of available slots in the buffer, for the producer to write to. The placeholder variables, denoted by P, Q, R, and S, in the code below can be assigned either empty or full. The valid semaphore operations are: wait ( ) and signal ( ). Producer: Consumer: do { wait (P) ; wait (mutex) ; //Add item to buffer signal (mutex) ; signal (Q) ; } while (1) ; do { wait (R) ; wait (mutex) ; //Consume item from buffer signal (mutex) ; signal (S) ; } while (1) ; Which one of the following assignments to P, Q, R and S will yield the correct solution?

A

P: full, Q: full, R: empty, S: empty

B

P: empty, Q: empty, R: full, S: full

C

P: full, Q: empty, R: empty, S: full

D

P: empty, Q: full, R: full, S: empty

A rectangular pulse train s(t) as shown in the figure is convolved with the signal cos²(4π × 10³t). The convolved signal will be a
Signal Processing mcq question image

A

DC

B

12 kHz sinusoid

C

8 kHz sinusoid

D

14 kHz sinusoid

In a synchronous modem, the digital-to-analog converter transmits signal to the

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