Engineering

ISBT Reasoning for all banking PO,Clerk,IBPS PO,Railway,SSC,IAS,OAS Exams

Q61.
When the bias in an FET stops the flow of current, the condition is called -
1) Forward breakover 2) Cutoff
3) Reverse bias 4) Pinchoff
5)Avalanche
Answer : Pinchoff
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Q62.
The other name for beta of BJT is
1) Current amplification factor 2) Voltage amplification factor
3) Power amplification factor 4) Optimum amplification frequency
5)None of these
Answer : Current amplification factor
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Q63.
Which of the following is not characteristic of an oscillator ?
1) Negative feedback 2) Good output to input coupling
3) Reasonably high transistor gain 4) Alternating current signal output
5)Usefulness as a signal generator
Answer : Negative feedback
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Q64.
A very brief, high voltage spike on an ac power line is called as - 
1) A bleeder 2) An arc
3) A transient 4) An avalanche
5)A clipped peak
Answer : A transient
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Q65.
Which of the following is not a common form of data transmission ?
1) Polarization modulation 2) Frequency modulation
3) Amplitude modulation 4) Phase modulation
5)Pulse modulation
Answer : Polarization modulation
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Q66.
A diode can be used as a frequency multiplier because of its - 
1) Junction capacitance 2) Non linearity
3) Avalanche voltage 4) Forward breakover
5)Charge carrier concentration
Answer : Non linearity
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Q67.
If 60 J of energy are available for every 15 C of charge, what is the voltage ?
1) 4 V 2) 60 V
3) 15 V 4) 0.25 V
Answer : 4 V
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Q68.
The pressure energy goes on changing into kinetic energy in case of -
1) Pelton turbine 2) Francis turbine
3) Kaplan turbine 4) Francis and Kaplan
5)None of these
Answer : Francis and Kaplan
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Q69.
The pressure energy goes on changing into kinetic energy in case of -
1) Pelton turbine 2) Francis turbine
3) Kaplan turbine 4) Francis and Kaplan
5)None of these
Answer : Francis and Kaplan
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Q70.
A turbine is having specific speed of 400. Then the turbine would be

1) Kaplan turbine 2) Francis turbine
3) Pelton turbine 4) only 2 & 3
5)None of the above
Answer : Kaplan turbine
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