Engineering

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

Q21.	If an open capacitor is checked with an ohmmeter, the needle will -

1)	stay on zero	2)	stay on infinity
3)	move from zero to infinity	4)	move from infinity to zero
5)	None of these

Q22.	What is the circuit when a resistor and an output capacitor form a series circuit with a square wave applied ?

1)	an integrator	2)	a differentiator
3)	a multiplier	4)	a divider
5)	None of these

Q23.	Which of the following is considered as a capacitor's rate of charge  ?

1)	magnetic	2)	a current block
3)	linear	4)	exponential
5)	None of these

Q24.	What is the total capacitance ?

1)	4 F	2)	12 F
3)	6 F	4)	8 F
5)	None of these

Q25.	Which of the following is a feature of an SCR device ?

1)	Three layers with four junctions	2)	Three layers with two junctions
3)	Four layers with three junctions	4)	Two layers with three junctions
5)	None of these

Q26.	Which of the following  is used by a Zener diode  ?

1)	Voltage Regulation	2)	Rectification
3)	Noise Suppression	4)	Blocking A.C
5)	None of these

Q27.	A power gain of 30dB is equivalent to which amplification factor ?

1)	0.001	2)	1/30
3)	30	4)	1000
5)	None of these

Q28.	A disadvantage of a half wave rectifier is the fact that -

1)	The output voltage is excessive compared to that of a full-wave rectifier	2)	The output current is excessive compared to that of a full-wave rectifier.
3)	The output waveform is harder to filter than is the case with a full wave rectifier	4)	It requires several expensive diodes, whereas a full wave rectifier requires only a single diode
5)	None of these

Q29.	In N-type semiconductor, the minority carriers are -

1)	Electrons	2)	Protons
3)	Holes	4)	Positrons
5)	None of these

Q30.	The VA rating of a transformer is an expression of -

1)	The maximum frequency at which it can function	2)	The type of core material it has
3)	The voltage step-up or step-down ratio	4)	The impedance transfer ratio
5)	None of the above