(I)For constant power of an isolated alternator, V-curves can be obtained. (II)For constant power of an alternator connected to IBB, V-curves can be obtained.

(I) For constant power of an isolated alternator, V-curves can be obtained. (II) For constant power of an alternator connected to IBB, V-curves can be obtained

A

I is true, II is false

B

Both the statements are true

C

I is false while II is true

D

Both are false

(I) Speed of an isolated alternator can be altered. (II) Speed of an alternator connected to IBB can be also altered.

A

I is true, II is false

B

Both the statements are true

C

I is false while II is true

D

Both are false

A system consists of an alternator having reactance of 0.5pu connected to an infinite bus through a series of reactance of 1 pu. The generator terminal voltage of IBB is 1 pu and that of 1.2 pu. The emf induced in the alternator will have the phase difference with respect to reference for the maximum power transfer is _______________

A

90

B

0

C

73.87

D

86.25

An alternator, with synchronous reactance of 0.8 pv is connected to an IBB at rated voltage. With its excitation emf adjusted to 1.3 pv, the alternator delivers an output of 0.5 pv. The load angle is __________

A

17.92

B

72.08

C

34.92

D

90

A system consists of an alternator having reactance of 0.5pu connected to an infinite bus through a series of reactance of 1 pu. The generator terminal voltage of IBB is 1 pu and that of 1.2 pu. The Steady state occurs at power angle of ________degree.

A

0

B

90

C

180

D

45

Shweta has connected a cell with a bulb. The bulb didn't glow. What could be the reasons? A. Bulb was connected by the positive terminal from both ends. B. One end of the bulb was connected with a positive terminal and another end was connected with a negative terminal. C. Bulb was connected by the negative terminal from both ends D. Bulb was fuse.

A

B, C

B

A,B and D

C

A,C

D

A, C, D

Which of the following statements regarding tree are correct? (A) All the links of a tree together does not constitute the complement of the corresponding tree (B) A connected subgraph of a connected graph is a tree if there exist (n - 1) nodes of the group (C) A connected subgraph of a connected graph is a tree if there exist many paths between any pair of nodes in it (D) The number of terminal nodes of end vertices of every tree are atleast two (E) Every connected graph has atleast one tree Choose the correct answer from the options given below: (1) (A) and (B) only (2) (B) and (C) only (3) (B) and (D) only (4) (D) and (E) only

A

1

B

2

C

3

D

4

The active power delivered by an alternator will _______ when the prime mover input is increased for the alternator connected to infinite bus bar.

A

increases

B

decreases

C

remains constant

D

no relation exists between the power and prime mover droop characteristic

Group I shows different heat addition processes in power cycles. Likewise, Group II shows different heat removal processes. Group III lists power cycles. Match items from Groups I, II and III. Group I Group II Group III P. Pressure constant S. Pressure constant 1. Rankine cycle Q. Volume constant T. Volume constant 2. Otto cycle R. Temperature constant U. Temperature constant 3. Carnot cycle 4. Diesel cycle 5. Brayton cycle

A

P – S – 5, R – U – 3, P – S – 1, Q – T - 2

B

P – S – 1, R – U – 3, P – S – 4, P – T - 2

C

R – T – 3, P – S – 1, P – T – 4, Q – S - 5

D

P – T – 4, R – S – 3, P – S – 1, P – S - 5

Before an alternator can be connected to an infinite bus, which of the following must be the same for the alternator and the infinite bus?

A

Only frequency

B

Voltage, frequency and phase sequence; and the phase difference between the alternator and infinite voltages must be zero

C

Only voltage

D

Only phase sequence

(I)For constant power of an isolated alternator, V-curves can be obtained. (II)For constant power of an alternator connected to IBB, V-curves can be obtained.

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