﻿

### Engineering

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

##### if there are b branches and n nodes the number of equations will be
 1) n-1 2) b 3) b-n 4) b-n+1 5) None of these
Answer : b-n+1 View Answer
##### The minimum requirements for causing flow of current are
 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 View Answer
##### Due to the existence of  which of the following, the current flowing in an electrical circuit ?
 1) mmf 2) emf 3) Resistance 4) Reluctance 5) None of these
Answer : emf View Answer
##### What is the main purpose of annealing ?
 1) to improve machinability 2) to improve magnetism 3) to increase hardness 4) to increase toughness 5) None of these
Answer : to improve machinability View Answer
##### The purpose of transmission in an automobile is to vary the -
 1) speed of the automobile 2) torque of the automobile 3) power of the automobile 4) fuel efficiency of the automobile 5) None of these
Answer : torque of the automobile View Answer
##### Which one of the following is not the advantage of CNC machine ?
 1) Reduces inspection time 2) Reduces tooling time 3) Higher initial cost 4) Higher rate of production 5) None of these
Answer : Higher initial cost View Answer
##### Which one of the following processes is used for removing scratches from the previous operations ?
 1) Enamelling 2) Painting 3) Oxidation 4) Polishing 5) None of these
Answer : Painting View Answer
##### 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 :

Sin wtCos wt Differentiating

Cos wt2 Sin wt

An input of 10 Cos wt will cause a

Response of – 20 Sin wt. View Answer
##### 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. View Answer
##### The electric field lines and equipotential lines -
 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. View Answer