77.

78.

79.

80.

81.

82.

Which of the following type of pump needs more frequent overhaul frequency than
others under similar operating conditions ?

(^) Submersible pump
(B) Vertical turbine pump
(C) Centrifugal pumps

(D) All of these pumps have broadly the same maintenance frequency

Which of the following is true about the Submersible pumps ?

(A) Single stage pumps are preferred over Multistage pumps in water wells and oil
wells

(B) They are centrifugal pumps operating in a vertical position
(C) The energy conversion taking place at the pump diffuser is kinetic energy into
pressure energy

(D) All are true

Which of the following is false about Jet pumps ?

(^) It has no reciprocating parts

(B) The motor and pump cannot be offset from the well
(C) Suction pipe is connected to the nozzle chamber
(D) All are false

Which of the following is wrong ?
(A) A locked pump shaft will result in blown pump fuse

(B) Clogged strainer will result in reduced pump capacity

(C) A leaking valve will cause rapid wear and tear on parts

(D) Faulty pressure switch will result in pump not starting up

Crowning of pulleys are done for :
(A) Better belt life (B) Lesser chance of belt running off
(C) Less belt slips (D) None of these

Which of the following is not true about induction motors ?

(^) Rotor of the induction motor cannot run at synchronous speed.
(B) Motor r.p.m. increases with frequency of input supply

(C) Low rotor resistance means high starting torque

(D) Direction of rotation of an induction motor can be changed by any two swapping
phase leads

11 008/2022
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