The average life of neutrons after they decay is
- 100 sec
- 1000 sec
- 1 sec
- 10 sec
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ALL INDIA ELECTRICAL PSU'S POWER GRID ,NTPC ,ISRO, DRDO, NPCIL, BARC , IES, SSC JE, BHEL, ONGC etc..
Which circuit is used as amplitude comparartor
- Schmitt Trigger
- Astable
- Monostable
- Bistable
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A hole in a semiconductor is defined as …………….
- A free neutron
- A free electron
- The incomplete part of an electron pair bond
- A free proton
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The random motion of holes and free electrons due to thermal agitation is called ……….
- Diffusion
- Ionization
- Pressure
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When the temperature of an extrinsic semiconductor is increased, the pronounced effect is on……
- Junction capacitance
- Minority carriers
- Majority carriers
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PVC stands for
- positive voltage conductor
- polyvinyl chlorofloride
- post varnish conductor
- polyvinyl chloride
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Solid type cables are considered unreliable beyond 66 kV because
- there is a danger of breakdown of insulation due to the presence of voids
- insulation may melt due to higher temperature
- skin effect dominates on the conductor
- of corona loss between conductor and sheath material
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In the cables, sheaths are used to
- proper stress sistribution
- provide proper insulation
- provide enough strength
- prevent the moisture from entering the cable
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The spring material used in a spring control device should have the following property.
- Should have low specific resistance
- Most be of low temperature co-efficient
- Should be non-magnetic
- nonoe of these
- All of the above
- Should not be subjected to fatigue
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Which of the following component is usually fabricated out of silicon steel ?
- None of the above
- Shaft
- Bearings
- Statorcore
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For a JFET, when VDS is increased beyond the pinch off voltage, the drain current
- Remains constant
- Increases
- Decreases
- First decreases and then increases
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Zero power factor method of an alternator is used to find its
- Synchronous impedance
- Efficiency
- Voltage regulation
- Armature resistance
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With a unity load p.f, the effect of armature reaction on the main field flux of an alternator is
- Nominal
- Demagnetising
- Magnetising
- Distortional
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Assume that the op-amp of the fig. is ideal. If Vi is a triangular wave, then V0 will be
- Sine wave
- Square wave
- Triangular wave
- Parabolic wave
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A differential amplifier is invariably used in the i/p stage of all op-amps. This is done basically to provide the op-amps with a very high
- Bandwidth
- Open-loop gain
- CMMR
- Slew rate
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Whom to choose between ntpc and haryana state power
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What is the syllabus for ISRO SC electrical.What are the important subject s to concentrate.
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