Engineering

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

Q31.	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

Q32.	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

Q33.	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

Q34.	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

Q35.	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

Q36.	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

Q37.	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

Q38.	A voltage will influence current only if the circuit is:

1)	insulated	2)	closed
3)	open	4)	high resistance
5)	None of these