Equation of time which is the difference between apparent solar time and mean solar time at any instant, vanishes during one year

If two currents are in the same direction at any instant of time in a given branch of a circuit, the net current at that instant

A

Is zero

B

Is the sum of the two currents

C

Is the difference between the two currents

D

Cannot be determined

In case of a shell and tube heat exchanger, the effect of L/D on inside film heat transfer co-efficient (hi) vanishes after a Reynold number of

A

1000

B

3000

C

5000

D

10000

What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?

A

The motor will stop

B

The motor will continue to run

C

The armature may burn

D

The motor will run noisy

The flow in which the particles of a fluid attain such velocities that varies from point to point in magnitude and direction as well as from instant to instant, is known as

A

One dimensional flow

B

Uniform flow

C

Steady flow

D

Turbulent flow

সরল ছন্দিত গতিতে স্পন্দনরত দুটি কণার সরণ-X1=Acosωt এবং X2=Acosωt, যে কোন সময়ে এদের মধ্যে দশা পার্থক্য কত হবে? (Two particles are oscillating at simple harmonic motion. If their displacements are described by X1=Asinωt and X2 =Acosωt, what will be the phase difference between them at any instant?)

A

2π

B

π

C

π2

D

π4

সরল ছন্দিত গতিতে স্পন্দনরত দুটি কণার সরণ X1=Asinwt এবং X2=Acoswt, যে কোন সময়ে এদের মধ্যে দশা পার্থক্য কত হবে? (Two particles are oscillating at simple harmonic motion. If their displacements are described by x1 = Asinwt and x2 = Acostat, what will be the phase difference between them at any instant?)

A

2π

B

π

C

π/2

D

π/4

Difference at any instant between the value of the controlled variable and the set point is called the

A

Deviation

B

Derivative time

C

Error ratio

D

Differential gap

The velocity of a particle (v) moving with simple harmonic motion, at any instant is given by (where, r = Amplitude of motion and y = Displacement of the particle from mean position.)

A

$$\omega \sqrt {{{\text{y}}^2} - {{\text{r}}^2}} $$

B

$$\omega \sqrt {{{\text{r}}^2} - {{\text{y}}^2}} $$

C

$${\omega ^2}\sqrt {{{\text{y}}^2} - {{\text{r}}^2}} $$

D

$${\omega ^2}\sqrt {{{\text{r}}^2} - {{\text{y}}^2}} $$

The velocity of a particle moving with simple harmonic motion, at any instant is given by (where $$\omega $$ = Displacement of the particle from mean position)

A

$$\omega \sqrt {{{\text{x}}^2} - {{\text{r}}^2}} $$

B

$$\omega \sqrt {{{\text{r}}^2} - {{\text{x}}^2}} $$

C

$${\omega ^2}\sqrt {{{\text{x}}^2} - {{\text{r}}^2}} $$

D

$${\omega ^2}\sqrt {{{\text{r}}^2} - {{\text{x}}^2}} $$

The difference between a two-digit number and the number obtained by interchanging the digits is 36. What is the difference between the sum and difference of the digits of the number if the ratio between the digits the number is 1 : 2?

A

4

B

8

C

16

D

24

Equation of time which is the difference between apparent solar time and mean solar time at any instant, vanishes during one year

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