In an AC co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be

Which of these statements are correct?
1. Ocean currents are the slow- surface movement of water in the ocean.
2. Ocean currents assist in maintaining the Earth's heat balance.
3. Ocean currents are set in motion primarily by prevailing winds.
4. Ocean currents are affected by the configuration of the ocean.

A

1 and 2

B

2, 3, and 4

C

1, 3 and 4

D

1, 2, 3, and 4

Which of the following statements is/are correct with respect to a Scott-connected transformer? I. It can do 3-phase to 2-phase conversion II. It can do 2-phase to 3-phase conversion III. It can do 2-phase to 4-phase conversion IV. It can do 3-phase to 4-phase conversion

A

Statements IV and II

B

Statement II only

C

Statements III and IV

D

Statements I and II

The network formed by resistors and capacitors for modifying the rate of change of gain and the phase shift is called a compensating network. Which of the following statements are not correct ? (A) The main purpose of a compensating network is to modify the performance of op-amp ciruit over the desired frequency range (B) There are two types of op-amps : internally compensated and externally compensated (C) 741 C is an externally compensated op-amp while 709 C is internally compensated op-amp (D) The phase lag and phase lead are most commonly used compensating networks in op-amps (E) Phase lag contributes a positive phase angle and phase lead a negative phase angle Choose the most appropriate answer from the options given below :

A

(B) and (C) only

B

(B) and (E) only

C

(C) and (D) only

D

(C) and (E) only

Consider the following two statements about ocean currents and choose the correct option. A. The areas where the warm and cold currents meet provide the best fishing grounds of the world. B. The areas where the warm and cold currents meet are difficult areas for navigation.

A

A is true and B is false

B

A is false and B is true

C

Both A and B are true

D

Both A and B are false

Which of the following are reasons for the chief fishing grounds being located in continental shelf areas where cold and warm currents meet? I. Warm currents are rich in phosphates and nitrates II. Plankton - the chief fish feed - thrives in these regions III. The meeting of cold and warm currents allows the water to be well aerated IV. The epicontinental seas allow sunlight to reach almost to the bottom

A

I and III

B

II and IV

C

I, II and III

D

II, III and IV

Which of the following are reasons for the chief fishing grounds being located in continental shelf areas where cold and warm currents meet?
I. Warm currents are rich in phosphates and nitrates
II. Plankton - the chief fish feed - thrives in these regions
III. The meeting of cold and warm currents allows the water to be well aerated
IV. The epicontinental seas allow sunlight to reach almost to the bottom

A

I and III

B

II and IV

C

I, II and III

D

II, III and IV

Consider the following statements in the relevant context: 1. The two types of currents that flow in semiconductor diodes and transistors are drift and diffusion currents. 2. The junction region is called depletion region or space-charge region. 3. When currents flow through the diode in forward bias, the depletion region current is mostly of ‘diffusion’ type. Which of the above statements are correct?

A

1, 2 and 3

B

1 and 2 only

C

1 and 3 only

D

2 and 3 only

Which of the following statements is not true with regard to Ocean currents? (i) The warm ocean currents originate near the equator and move towards the poles. (ii) The cold currents carry water from polar or higher latitudes to tropical or lower latitudes. (iii) The Labrador Ocean current is cold current while the Gulf Stream is a warm current.

A

Only (i)

B

Only (ii)

C

All (i), (ii) & (iii)

D

None of the above.

Which one of the following statements are correct? (A) Ocean currents provide a high degree of regulation to the thermal environments of the earth‘s surface (B) On a local scale, warm water currents bring moderating influence to coasts in arctic latitudes (C) Cold currents are not able to bring down the temperature of tropical deserts (D) Density differences may also cause flow of ocean water Choose the correct answer from the options given below:

A

(A), (C) and (D) only

B

(A), (B) and (D) only

C

(B), (C) and (D) only

D

(A), (B) and (C) only

Assertion (A): All the mesh currents are necessarily the loop currents but all the loop currents may not be the mesh current. Reason (R): The mesh current is the current which flows only around the perimeter of a mesh.

A

Both (A) and (R) are true and (R) is the correct explanation of (A).

B

Both (A) and (R) are true, but (R) is not the correct explanation of (A).

C

(A) is true, but (R) is false.

D

(A) is false, but (R) is true.

In an AC co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be

Related Questions