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A transistor is used in common emitter mode as an amplifier. Then a. The base-emitter junction is forward biased b. The base-emitter junction is reverse biased  c. The input signal is connected in series with the voltage applied to the base-emitter junction  d. The input signal is connected in series with the voltage applied to bias the base-collector junction Which of the following statement is true?
Statement (I): When a flat-faced follower is used, it would be preferable to provide an offset in the plane perpendicular to the plane of rotation of the cam. Statement (II): Because of the offset, the follower is made to rotate continuously about its axis which in turn avoids jamming of the follower in its guide while moving up or down, reduces the wear of the follower flat surface and distributes the wear uniformly.
The displacement and velocity diagrams of a cam and follower mechanism are shown as: Which of the following statements is/are correct? 1. The acceleration of the follower at the beginning and at the end of each stroke will be zero. 2. The follower remains at rest in the dwell period. 3. During period DE, the motion of the follower is retarding. Select the correct answer using the code given below.
What is the effect of the base circle on the follower? I) Follower velocity increases with the base radius. II) Follower acceleration increases with the base radius. III) Follower velocity and acceleration do not depend on the base radius.
A certain inverting amplifier has a closed-loop voltage gain of 25. The OP-amp has an open-loop voltage gain of 100,000. If an OP-amp with an open-loop voltage gain of 200,000 is substituted in the arrangement, the closed-loop gain
Choose the right option among the alternatives – A transistor conducts in its forward direction when its collector/emitter/base, is positive with respect to its collector/emitter/base, and when a turn-on voltage or current signal is applied to its collector/emitter/base.
In the case of a circular arc cam with a flat-faced reciprocating follower, when the follower is in contact with nose of cam, the external spring force required for maintaining the contact between follower and cam is
Consider the following statements regarding cams : 1. A cam in which the follower moves radially from the centre of rotation of the cam is known as a disc cam. 2. A globoidal cam is a double-disc cam, the two discs being keyed together and are in constant touch with the two rollers of a follower. 3. A conjugate cam can have two types of surfaces, convex or concave. 4. In a spherical cam the follower oscillates about an axis perpendicular to the cam, the axis of rotation of the cam. Which of the above statements are correct?  
Average age of an ABC party leader and 9 of its followers is 29.7 years. All the followers have the same age and the difference between ages of a leader and a follower is 47 years. The average age of the leader and a follower is A. Which of the following is/are correct? I. A is an integer. II. A – 19 = 32.3 III. A/5 = 9.7 IV. Age of the leader is 47 years more than the age of the follower.
A cam should be designed only using uniform rise and fall within half of the cam, the remaining is dwell period, and without any dwell period in between the rise -fall periods and rise and fall periods should be same. The maximum rise in follower is 30 mm. How much the follower will rise when the follower is 120 degrees from its initial position of a cam?