21) Bakelite is a/an

insulator

semiconductor

high resistance conductor

Low resistance conductor

Answer is:

insulator

RRB JE Mechanical Question Paper 2014 (Set-1) with Answer Key

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22) Losses which do not occur in transformer but do occur in rotating electric machine are

Copper losses

Magnetic losses

Friction and windage losses

Hysteresis and eddy current losses

Answer is:

Friction and windage losses

23) In Fleming's Right Hand rule, the thumb points towards

direction of flux

direction of induced e.m.f

direction of motion of conductor, if fore finger points along the lines of flux

direction of motion of the conductor if fore finger points in the direction of generated e.m.f.

Answer is:

direction of motion of conductor, if fore finger points along the lines of flux

24) An antenna is a device which

Converts electric Power into radio waves or vice versa

Converts a sound wave to a magnetic signal

Converts a sound wave of one wavelength to other

Converts an AC to DC

Answer is:

Converts electric Power into radio waves or vice versa

25) Which of the following can provide a digital signal?

Sine wave

Square wave

Gradual tuning of a potentiometer

Slow change in the value of resistor

Answer is:

Square wave

RRB JE Mechanical Question Paper 2014 (Set-1) with Answer Key

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21) Bakelite is a/an

insulator

RRB JE Mechanical Question Paper 2014 (Set-1) with Answer Key

Related RRB JE Mechanical Question Paper 2014 (Set-1) with Answer Key

22) Losses which do not occur in transformer but do occur in rotating electric machine are

Friction and windage losses

23) In Fleming's Right Hand rule, the thumb points towards

direction of motion of conductor, if fore finger points along the lines of flux

24) An antenna is a device which

Converts electric Power into radio waves or vice versa

25) Which of the following can provide a digital signal?

Square wave

RRB JE Mechanical Question Paper 2014 (Set-1) with Answer Key