M

Mr. Dubey • 52.30K Points
Coach 

Q. In dynamic braking, when braking is applied system acts as

(A) freely running machine
(B) motor with slow speed
(C) generator
(D) motor with same speed in opposite direction
Correct : Option (C)

Explanation: 
 the armature is disconnected from the supply and then a braking resistor rb is immediately connected across it. the motor acts as a generator, driven by the inertia and stored kinetic energy dissipating power in rb. this is a simple method of bringing a motor nearly to a standstill.

Share

Discusssion

Login to discuss.

Be the first to start discuss.

Related MCQs

Q. Superficial steam turbines releases _______ CO2.

Q. In case of absorption, both the operating and equilibrium lines will be straight for

Q. Lowest melting point may be expected for

Q. McCabe-Thiele method of binary distillation does not assume that the

Q. For the same compression ratio and heat addition

Q. When two forces acting at a point are such that if the direction of one is reversed, the direction of the resultant is turned through a right angle, t

Q. Machining is never used for rapid prototyping because it takes too long.

Q. Which of the following is not a standard ball diameter for Brinell hardness testing?

Q. Make up water is required in a cooling tower to replace the water lost by

Q. Pick out the wrong statement. Generally for physical adsorption, a gas of