The maximum load that a power transformer can carry is limited by its

A single phase transformer has a maximum efficiency of 90% at full load and unity power factor. Efficiency at half load at the same power factor is -

A

87.8%

B

86.7%

C

88.26%

D

88.9%

In testing a pile by load test, pile platform is loaded with one and half times the design load and a maximum settlement is noted. The load is gradually removed and the consequent rebound is measured. For a safe pile, the net settlement (i.e. total settlement minus rebound) per tonne of test load should not exceed

A

10 mm

B

15 mm

C

20 mm

D

25 mm

If a truck can carry 10 to 16 boxed refrigerators, then what is the least number of refrigerators that 4 trucks can carry?

A

40

B

52

C

48

D

64

When the axis of load lies in the plane of rivet group, then the most heavily loaded rivet will be the one which (where, Fa is the load shared by each rivet due to axial load and Fm is the shearing load due to moment in any rivet.)

A

Is at the maximum distance from CG of the rivet group

B

Is at the minimum distance from CG of the rivet group

C

Gives the maximum angle between the two forces Fa and Fm

D

Gives the minimum angle between the two forces Fa and Fm

The output transformer used in a power amplifier is a ___________ transformer

A

1:1 ratio

B

Step-up

C

Step-down

D

None of the above

Power amplifiers generally use transformer coupling because transformer per-mits

A

Cooling of the circuit

B

Impedance matching

C

Distortionless output

D

Good frequency response

The simply supported beam 'A' of length '$$l$$' carries a central point load 'W'. Another beam 'B' is loaded with a uniformly distributed load such that the total load on the beam is 'W'. The ratio of maximum deflections between beams 'A' and 'B' is

A

$$\frac{5}{8}$$

B

$$\frac{8}{5}$$

C

$$\frac{5}{4}$$

D

$$\frac{4}{5}$$

The no-load current drawn by transformer is usually what per cent of the full-load current?

A

0.2 to 0.5 per cent

B

2 to 5 per cent

C

12 to 15 per cent

D

20 to 30 per cent

“Maximum power output is obtained from a network when the load resistance is equal to the output resistance of the network as seen terminals of the load”. The above statement is associated with

A

Millman’s theorem

B

Thevenin’s theorem

C

Superposition theorem

D

Maximum power transfer theorem

An ideal transformer will have maximum efficiency at a load such that

A

copper loss = iron loss

B

copper loss

C

copper loss > iron loss

D

none of the above

The maximum load that a power transformer can carry is limited by its

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