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Mr. Dubey • 51.17K Points
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Q. 121) What type of force handles for active torques?

(A) Strong nuclear forces
(B) Weak nuclear forces
(C) Gravitational forces
(D) Electrostatic forces
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Mr. Dubey • 51.17K Points
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Q. 122) Passive torques always oppose the motion of the driven machine.

(A) True
(B) False
(C) none
(D) all
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Mr. Dubey • 51.17K Points
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Q. 123) Among the following which one exhibits linearly rising load torque characteristics?

(A) Elevators
(B) Rolling Mills
(C) Fan load
(D) Separately excited dc generator connected to the resistive load
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Mr. Dubey • 51.17K Points
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Q. 124) What is the condition for the steady-state operation of the motor?

(A) Load torque > Motor torque
(B) Load torque <<<< Motor torque
(C) Load torque = Motor torque
(D) Load torque < Motor torque
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Mr. Dubey • 51.17K Points
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Q. 125) Choose the correct one. (* stands for multiplication, J represents the moment of inertia, w represents angular spee(D).

(A) J*d(w)/dt = Load torque – Motor torque
(B) J*d(w)/dt = Load torque + Motor torque
(C) J*d(w)/dt = Motor torque – Load torque
(D) J*d(w)/dt = Load torque * Motor torque
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Mr. Dubey • 51.17K Points
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Q. 126) In DC chopper, the waveform for input and output voltages is respectively __________

(A) Discontinuous and Continuous
(B) Continuous and Discontinuous
(C) Both continuous
(D) Both discontinuous
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Mr. Dubey • 51.17K Points
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Q. 127) A chopper behaves as a __________

(A) DC equivalent of AC switching device
(B) DC equivalent of AC transformer
(C) DC equivalent of AC relay
(D) AC equivalent of circuit breaker
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Mr. Dubey • 51.17K Points
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Q. 128) A DC chopper feeds an RLE load. If the value of E is increased by 20%, the current ripple ________

(A) increases by 20%
(B) decreases by 20%
(C) increases only 20%
(D) remains the same
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Mr. Dubey • 51.17K Points
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Q. 129) The conduction loss versus device current characteristic of a power MOSFET is best approximated by a ________

(A) Straight line
(B) Rectangular hyperbola
(C) Parabola
(D) Exponential decaying functions
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Mr. Dubey • 51.17K Points
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Q. 130) Which of the following device is NOT suitable for parallel operation?

(A) MOSFET
(B) BJT
(C) IGBT
(D) TRIAC
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