If the frequency is halved and the resistance is doubled, the impedance of a series RL circuit

In a series RC circuit, when the frequency and the resistance are halved, the impedance

A

Doubles

B

Is halved

C

Is reduced to one-fourth

D

Cannot be determined without values

A simple spring-mass vibrating system has a natural frequency of $${{\text{f}}_{\text{n}}}.$$ If the spring stiffness is halved and the mass is doubled, then the natural frequency will become

A

$$\frac{{{{\text{f}}_{\text{n}}}}}{2}$$

B

$$2{{\text{f}}_{\text{n}}}$$

C

$$4{{\text{f}}_{\text{n}}}$$

D

$$8{{\text{f}}_{\text{n}}}$$

In the formula e = hf . if e is doubled and f is halved , what happens to the value of h?

A

h remains tehe same

B

h is doubled

C

h is divided by 4

D

h is multiplied by 4

If the radius of cylinder is halved and height is doubled , then what will be the curved surface area?

A

Increase by 1

B

The same

C

Double

D

Triple

if the radious of cylinder is halved and height is doubled, then what will be the curved surface area

A

increase by one

B

the same

C

double

D

triple

If th radius of cylinder is halved and height is doubled, then what will be the curved surface area?

A

icrease by 1

B

the same

C

double

D

triple

If the radius of cylinderis halved and height is doubled, then what will be the curved surface area?

A

increase by 1

B

the same

C

double

D

triple

If the digit in the unit's place of a two-digit number is halved and the digit in the ten's place is doubled, the number thus obtained is equal to the number obtained by interchanging the digits. Which of the following is definitely true ?

A

Sum of the digits is a two-digit number

B

Digit in the unit's place is half of the digit in the ten's place

C

Digit in the unit's place and the ten's place are equal

D

Digit in the unit's place is twice the digit in the ten's place

For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus-Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of

A

1

B

1.74

C

6.1

D

37

In an ac circuit, power to the load peaks at the frequency at which the load impedance is the complex conjugate of the output impedance.

A

True

B

False

If the frequency is halved and the resistance is doubled, the impedance of a series RL circuit

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