The use of predatory insects, fungi, or viruses is called ____________________
Fill in the blank(s) with correct word
biological control
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The ____ input terminal is connected to the neutral or grounded power conductor.
A. common B. L1 C. L2 D. tenth
?What can happen to cylinders if they are rebored while the block is mounted on a conventional engine stand?
What will be an ideal response?
A dc, separately excited motor is used to drive a constant-torque load. The field circuit is excited by a full-wave, ac/dc SCR converter. The armature circuit of the motor is connected to a constant dc voltage source of 160 V. The inductance of the field circuit is large, and the field current is always continuous. The ac voltage (input to the converter) is 120 V (rms), and the field resistance is 100 ?. The armature resistance is 2 ?. When the triggering angle of the SCRs is adjusted to zero, the motor speed is 1200 rpm, and the armature current is 10 A.
a. Calculate the average current and dc power of the field circuit when the triggering angle is equal to 20o. b. Calculate the rms voltage across the field windings for the condition given in (a). Explain how the rms voltage is dependent on the triggering angle. c. Calculate the no-load speed of the motor. Ignore the friction and windage losses. d. Calculate the triggering angle to operate the motor at a speed of 1400 rpm. e. Can you use the field converter to reduce the motor speed to 1000 rpm? How?
All of the following are types of clips EXCEPT ________
A) Cotter B) C clip C) E clip D) Internal snap ring