A) Fixed speed operation B) Variable speed operation C) High speed operation D) Low speed operation. Ans : (B)
A) reduces slightly B) increases slightly C) remains unaltered D) increases in proportion to the increases in load. Ans : (A)
A) the load is variable B) the load is constantly decreasing C) the load has overhauling characteristics D) the load also acts as a braking force. Ans : (C)
A) motor is run as a generator B) motor is reversed in direction C) motor is run at reduced speed. Ans : (A)
A) 10 N.m B) 20 N.m C) 40 N.m D) 80 N.m. Ans : (D)
A) brush material B) type of slip rings C) shape of conductors D) field flux. Ans : (D)
A) Speeds of the motors are separately controlled B) Both motors run at their respective rated speeds C) Both machines are mechanically coupled D) Both motors are run as generators. Ans : (C)
A) it will stop B) it will burn out C) it will run smoothly D) it will run with less efficiency and high sparks. Ans : (D)
A) at no load motor gives vicious sparking B) load on the motors acts as a brake C) at no load, losses in a series motor are high D) at no load a series motor develops infinite speed. Ans : (D)
A) 160 N B) 16 N C) 1.6 N D) 0.16 N. Ans : (C)