Insulation resistance of high voltage circuit breakers is more than

A hot fluid is being conveyed through a long pipe of 4 cm outer diameter and covered with 2 cm thick insulation. It is proposed to reduce the conduction heat loss to the surroundings to one-third of the present rate by further covering with same insulation. Calculate the additional thickness of insulation

A

11 cm

B

12 cm

C

13 cm

D

14 cm

In the question a statement is given, followed by two arguments, I and II. You have to consider the statement to be true even if it seems to be atvariance from commonly known facts. You have to decide which of the given arguments, if any, is a strong argument. Statement : Should speed breakers be banned? Argument I : Yes, data shows that number of accidents increase after putting the speed breakers.
Argument II : No, it teaches fast drivers a lesson.

A

if only argument I is strong.

B

if only argument II is strong.

C

if both I and II are strong.

D

if neither I nor II is strong.

A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m².°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be

A

Greater than that for uninsulated steam pipe

B

Less than that of the uninsulated steam pipe

C

Equal to that of the uninsulated steam pipe

D

Less than the steam pipe with 5 cms insulation

An amplifier is measured to have an internal resistance of 10 kΩ, voltage gain of 100V/V and output resistance of 100 Ω. Also, when a load resistance of 1 kΩ is connected between the output resistance if found to decrease to 8 kΩ. If the amplifier is fed with the signal source having an internal resistance of 2 kΩ. Find Gm.

A

1 A/V

B

10 A/V

C

100 A/V

D

1000 A/V

An amplifier is measured to have an internal resistance of 10 kΩ, voltage gain of 100V/V and output resistance of 100 Ω. Also, when a load resistance of 1 kΩ is connected between the output resistance if found to decrease to 8 kΩ. If the amplifier is fed with the signal source having an internal resistance of 2 kΩ. Find Av.

A

9.09 V/V

B

10 V/V

C

90.9 V/V

D

100 V/V

An amplifier is measured to have an internal resistance of 10 kΩ, voltage gain of 100V/V and output resistance of 100 Ω. Also, when a load resistance of 1 kΩ is connected between the output resistance if found to decrease to 8 kΩ. If the amplifier is fed with the signal source having an internal resistance of 2 kΩ. Find Gvo.

A

53.3 V/V

B

63.3 V/V

C

73.3 V/V

D

83.3 V/V

An amplifier is measured to have an internal resistance of 10 kΩ, voltage gain of 100V/V and output resistance of 100 Ω. Also, when a load resistance of 1 kΩ is connected between the output resistance if found to decrease to 8 kΩ. If the amplifier is fed with the signal source having an internal resistance of 2 kΩ. Find Gv.

A

53.4 V/V

B

72.7 V/V

C

83.3 V/V

D

90.9 V/V

An amplifier is measured to have an internal resistance of 10 kΩ, voltage gain of 100V/V and output resistance of 100 Ω. Also, when a load resistance of 1 kΩ is connected between the output resistance if found to decrease to 8 kΩ. If the amplifier is fed with the signal source having an internal resistance of 2 kΩ. Find R out.

A

146 Ω

B

292 Ω

C

584 Ω

D

1168 Ω

An amplifier is measured to have an internal resistance of 10 kΩ, voltage gain of 100V/V and output resistance of 100 Ω. Also, when a load resistance of 1 kΩ is connected between the output resistance if found to decrease to 8 kΩ. If the amplifier is fed with the signal source having an internal resistance of 2 kΩ. Find Ai.

A

182 A/A

B

364 A/A

C

546 A/A

D

728 A/A

For the given circuit, input resistance RI = 20Ω, hfe = 50. Output resistance = ∞. Find the new values of input and output resistance, if a base resistance of 2kΩ is added to the circuit.

A

RI = 20Ω, RO = ∞

B

RI = 20Ω, RO = 2kΩ

C

RI = 59Ω, RO = ∞

D

RI = 59Ω, RO = 2kΩ

Insulation resistance of high voltage circuit breakers is more than

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