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In comparing the operation of the half-controlled 2-pulse circuit with that of the fully-controlled circuit, which of the following statements are evident? 1. Since half the thyristors are replaced by diodes, a half-controlled converter costs less than a fully-controlled converter. 2. Due to the freewheeling action with a half-controlled bridge-circuit power factor is improved in half-controlled converters. 3. The AC supply current is more distorted due to its zero periods with the half-controlled circuit, compared to a fully-controlled bridge circuit. Select the correct answer using the code given below :
A Pickering governor is driving a gramophone. Each disc attached to the centre of a leaf spring has a mass of 20 g. The width of each spring is 5 mm and thickness of 0.125 mm. The effective length of each spring is 40 mm. The distance from the spindle axis to the centre of gravity of the mass when the governor is at rest, is 10 mm. Find the speed of the governor in rpm when the sleeve has risen to a height of 0.8 mm. (E = 210kN/mm2)
A Pickering governor is driving a gramophone. Each disc attached to the centre of a leaf spring has a mass of 20 g. The width of each spring is 5 mm and thickness of 0.125 mm. The effective length of each spring is 40 mm. The distance from the spindle axis to the centre of gravity of the mass when the governor is at rest, is 10 mm, find the speed of the turntable in rpm if ratio of the governor speed to the turntable speed is 10.5.
When a closely-coiled helical spring of mean diameter (D) is subjected to an axial load (W), the deflection of the spring ($$\delta $$) is given by (where d = Diameter of spring wire, n = No. of turns of the spring and C = Modulus of rigidity for the spring material)
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is $$\tau $$. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be
An open coiled helical compression spring 'A' of mean diameter 50 mm is subjected to an axial load ‘W’. Another spring 'B' of mean diameter 25 mm is similar to spring 'A' in all respects. The deflection of spring 'B' will be __________ as compared to spring 'A'.
Consider the following statements: 1. In stationary constant speed engines, the spring-loaded governor mechanism is fitted on the cam-shaft of the engine. 2. Hunting occurs when the governor is not sensitive. 3. Isochronous governors have the same speed over a wide range of governor action. 4. A governor is said to be unstable if the radius of rotation falls as the speed increases. Which of the above statements are correct?
Which of the following is/are correct regarding the office of Governor in India? 1. One Governor can act as Governor of more than one State 2. The Governor has the power to grant pardons, reprieves, remission of punishment to persons convicted under the State Law 3. The Governor is appointed by the President on the recommendation of the Chief Minister of the respective State Select the correct answer using the code given below
Which among the following statements is/are not true about the executive powers of the Governor?
1. The Governor appoints the Vice-Chancellor of the universities of the state.
2. The Governor acts as the Chancellor of the universities of the state.
3. The Governor appoints the Chief minister and other state ministers.
4. The Governor appoints the advocate general of the state.
Which of the following statement is/are correct? (A) Arab Spring originated in Tunisia (B) Arab Spring was led by Saudi Arabia (C) Arab Spring spread to Afghanistan, Iraq, and Iran (D) Arab Spring is a floricultural movement