Engineering
ISBT Reasoning for all banking PO,Clerk,IBPS PO,Railway,SSC,IAS,OAS Exams
Q1. 
1)  R1  2)  R2 
3)  R3  4)  R4 
5)  None of these 
Answer : R3
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Q2.  if there are b branches and n nodes the number of equations will be 
1)  n1  2)  b 
3)  bn  4)  bn+1 
5)  None of these 
Answer : bn+1
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Q3. 

1)  a voltage source,a resistor, and a switch.  2)  a voltage source and a conductor 
3)  a power source and a bulb  4)  a voltage source,a conductor,an ammeter and a switch 
5)  None of these 
Answer : a voltage source and a conductor
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Q4. 

1)  mmf  2)  emf 
3)  Resistance  4)  Reluctance 
5)  None of these 
Answer : emf
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Q5.  In a
linear system, an input of 5 sin wt produces an output of 10 cos wt. The output
corresponding to input 10 cos wt will be equal to  
1)  + 5 sin wt  2)   5 sin wt 
3)  + 20 sin wt  4)  – 20 sin wt. 
5)  None of these 
Answer : – 20 sin wt.
Explanation :
Explanation :
Sin wtCos wt Differentiating
Cos wt2 Sin wt
An input of 10 Cos wt will cause a
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Q6.  For an SCR, di/dt protection is achieved through the use of which of the following series ? 
1)  R in series with SCR  2)  L in series with SCR 
3)  RL in series with SCR  4)  RLC in series with SCR 
5)  None of these 
Answer : L in series with SCR
Explanation : For an SCR, di/dt protection is achieved through the used of L in series with SCR. A snubber circuit connected across an SCR is to suppress dv / dt.
Explanation : For an SCR, di/dt protection is achieved through the used of L in series with SCR. A snubber circuit connected across an SCR is to suppress dv / dt.
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Q7. 

1)  Are parallel to each other  2)  Are one and the same 
3)  Cut each other orthogonally  4)  Can be inclined to each other at any angle 
5)  None of these 
Answer : Cut each other orthogonally
Explanation : Since no electric can exist along any surface, all points of which are at the same potential, electric field lines and equipotential lines are orthogonal to each other.
Explanation : Since no electric can exist along any surface, all points of which are at the same potential, electric field lines and equipotential lines are orthogonal to each other.
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Q8. 

1)  6 ohms  2)  4/3 ohms 
3)  3/2 ohms  4)  3/4 ohms 
5)  None of these 
Answer : 4/3 ohms
Explanation : Copper and coated metal strips have resistance of 2 ohms and 4 ohms respectively.
Explanation : Copper and coated metal strips have resistance of 2 ohms and 4 ohms respectively.
These two
strips are in parallel. Hence the resistance of the composite strip will be
(2x4) / (2+4) = 4/3 ohms.
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Q9. 

1)  2 amps  2)  4 amps 
3)  1.5 amps  4)  7.5 amps 
5)  None of these 
Answer : 2 amps
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Q10.  A network consists of linear resistors and ideal voltage source. If the value of the resistors are doubled, then voltage across each resistor is  
1)  halved  2)  doubled 
3)  increases four lines  4)  not changed 
5)  None of these 
Answer : not changed
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